v3.7.0

This rework changes two important things

1) the output redirect is deactivated while control is given to the reporters.
   This means that combining reporters that write to stdout with capturing
   reporters, e.g. `./tests -s -r console -r junit::out=junit.xml`, no
   longer leads to the capturing reporter seeing all the output from
   the other reporter captured.

Trying this with the `SelfTest` binary would previously lead to JUnit
spending **hours** trying to escape all of ConsoleReporter's output and
write it to the output file. I actually ended up killing the process
after 3 hours, during which the JUnit reporter wrote something like 50 MBs
of output to a file.

2) The redirect object's lifetime is tied to the `RunContext`, instead
  of being constructed for every partial test case run separately.

This has no effect on the basic StreamRedirect, but improves the FileRedirect
significantly. Previously, running many tests in single process with this
redirect (e.g. running `SelfTest -r junit`) would cause later tests to
always fail before starting, due to exceeding the limit of temporary files.

For the current `SelfTest` binary, the old implementation would lead to
**295** test failures from not being able to initiate the redirect. The
new implementation completely eliminates them.

----

There is one downside to the new implementation of FileRedirect, specific
to Linux. Running the `SelfTest` binary on Linux causes 3-4 tests to have
no captured stdout/stderr, even though the tests were supposed to be
writing there (there was no output to the actual stdout/stderr either,
the output was just completely lost).

Since this never happen for smaller test case sets, nor does it reproduce
on other platforms, this implementation is still strictly better than
the old one, and thus it can get reasonably merged.

.bazelrc

@@ -8,3 +8,4 @@ build:vs2022 --cxxopt=/std:c++17
 
 build:windows --config=vs2022
 build:linux --config=gcc11
+build:macos --cxxopt=-std=c++2b

.clang-tidy

@@ -0,0 +1,81 @@
+---
+# Note: Alas, `Checks` is a string, not an array.
+#       Comments in the block string are not parsed and are passed in the value.
+#       They must thus be delimited by ',' from either side - then they are
+#       harmless. It's terrible, but it works.
+Checks: >-
+  clang-diagnostic-*,
+  clang-analyzer-*,
+  -clang-analyzer-optin.core.EnumCastOutOfRange,
+
+  bugprone-*,
+  -bugprone-unchecked-optional-access,
+  ,# This is ridiculous, as it triggers on constants,
+  -bugprone-implicit-widening-of-multiplication-result,
+  -bugprone-easily-swappable-parameters,
+  ,# Is not really useful, has false positives, triggers for no-noexcept move constructors ...,
+  -bugprone-exception-escape,
+  -bugprone-narrowing-conversions,
+  -bugprone-chained-comparison,# RIP decomposers,
+
+  modernize-*,
+  -modernize-avoid-c-arrays,
+  -modernize-use-auto,
+  -modernize-use-emplace,
+  -modernize-use-nullptr,# it went crazy with three-way comparison operators,
+  -modernize-use-trailing-return-type,
+  -modernize-return-braced-init-list,
+  -modernize-concat-nested-namespaces,
+  -modernize-use-nodiscard,
+  -modernize-use-default-member-init,
+  -modernize-type-traits,# we need to support C++14,
+  -modernize-deprecated-headers,
+  ,# There's a lot of these and most of them are probably not useful,
+  -modernize-pass-by-value,
+
+  performance-*,
+  -performance-enum-size,
+
+  portability-*,
+
+  readability-*,
+  -readability-braces-around-statements,
+  -readability-container-size-empty,
+  -readability-convert-member-functions-to-static,
+  -readability-else-after-return,
+  -readability-function-cognitive-complexity,
+  -readability-function-size,
+  -readability-identifier-length,
+  -readability-implicit-bool-conversion,
+  -readability-isolate-declaration,
+  -readability-magic-numbers,
+  -readability-named-parameter,
+  -readability-qualified-auto,
+  -readability-redundant-access-specifiers,
+  -readability-simplify-boolean-expr,
+  -readability-static-definition-in-anonymous-namespace,
+  -readability-uppercase-literal-suffix,
+  -readability-use-anyofallof,
+  -readability-avoid-return-with-void-value,
+
+  ,# time hogs,
+  -bugprone-throw-keyword-missing,
+  -modernize-replace-auto-ptr,
+  -readability-identifier-naming,
+
+  ,# We cannot use this until clang-tidy supports custom unique_ptr,
+  -bugprone-use-after-move,
+  ,# Doesn't recognize unevaluated context in CATCH_MOVE and CATCH_FORWARD,
+  -bugprone-macro-repeated-side-effects,
+WarningsAsErrors: >-
+  clang-analyzer-core.*,
+  clang-analyzer-cplusplus.*,
+  clang-analyzer-security.*,
+  clang-analyzer-unix.*,
+  performance-move-const-arg,
+  performance-unnecessary-value-param,
+  readability-duplicate-include,
+HeaderFilterRegex: '.*\.(c|cxx|cpp)$'
+FormatStyle:     none
+CheckOptions: {}
+...

.conan/test_package/CMakeLists.txt

@@ -1,12 +1,8 @@
-cmake_minimum_required(VERSION 3.2.0)
-project(test_package CXX)
+cmake_minimum_required(VERSION 3.15)
+project(PackageTest CXX)
 
-include("${CMAKE_BINARY_DIR}/conanbuildinfo.cmake")
-conan_basic_setup()
+find_package(Catch2 CONFIG REQUIRED)
 
-find_package(Catch2 REQUIRED CONFIG)
-
-add_executable(${PROJECT_NAME} test_package.cpp)
-
-target_link_libraries(${PROJECT_NAME} Catch2::Catch2WithMain)
-set_target_properties(${PROJECT_NAME} PROPERTIES CXX_STANDARD 14)
+add_executable(test_package test_package.cpp)
+target_link_libraries(test_package Catch2::Catch2WithMain)
+target_compile_features(test_package PRIVATE cxx_std_14)

.conan/test_package/conanfile.py

@@ -1,12 +1,28 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
-from conans import ConanFile, CMake
+from conan import ConanFile
+from conan.tools.cmake import CMake, cmake_layout
+from conan.tools.build import can_run
+from conan.tools.files import save, load
 import os
 
 
 class TestPackageConan(ConanFile):
     settings = "os", "compiler", "build_type", "arch"
-    generators = "cmake_find_package_multi", "cmake"
+    generators = "CMakeToolchain", "CMakeDeps", "VirtualRunEnv"
+    test_type = "explicit"
+
+    def requirements(self):
+        self.requires(self.tested_reference_str)
+
+    def layout(self):
+        cmake_layout(self)
+
+    def generate(self):
+        save(self, os.path.join(self.build_folder, "package_folder"),
+             self.dependencies[self.tested_reference_str].package_folder)
+        save(self, os.path.join(self.build_folder, "license"),
+             self.dependencies[self.tested_reference_str].license)
 
     def build(self):
         cmake = CMake(self)
@@ -14,7 +30,11 @@ class TestPackageConan(ConanFile):
         cmake.build()
 
     def test(self):
-        assert os.path.isfile(os.path.join(
-            self.deps_cpp_info["catch2"].rootpath, "licenses", "LICENSE.txt"))
-        bin_path = os.path.join("bin", "test_package")
-        self.run("%s -s" % bin_path, run_environment=True)
+        if can_run(self):
+            cmd = os.path.join(self.cpp.build.bindir, "test_package")
+            self.run(cmd, env="conanrun")
+
+            package_folder = load(self, os.path.join(self.build_folder, "package_folder"))
+            license = load(self, os.path.join(self.build_folder, "license"))
+            assert os.path.isfile(os.path.join(package_folder, "licenses", "LICENSE.txt"))
+            assert license == 'BSL-1.0'

.github/workflows/linux-bazel-builds.yml

@@ -11,7 +11,7 @@ jobs:
         compilation_mode: [fastbuild, dbg, opt]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Mount bazel cache
       uses: actions/cache@v3

.github/workflows/linux-meson-builds.yml

@@ -18,10 +18,12 @@ jobs:
             other_pkgs: clang-11
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Prepare environment
-      run: sudo apt-get install -y meson ninja-build ${{matrix.other_pkgs}}
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y meson ninja-build ${{matrix.other_pkgs}}
 
     - name: Configure build
       env:
@@ -38,6 +40,5 @@ jobs:
 
     - name: Run tests
       working-directory: ${{runner.workspace}}/meson-build
-      # Hardcode 2 cores we know are there
       run: |
         meson test --verbose

.github/workflows/linux-other-builds.yml

@@ -29,13 +29,13 @@ jobs:
             build_type: Debug
             std: 14
             other_pkgs: g++-7
-            cmake_configurations: -DCATCH_BUILD_EXTRA_TESTS=ON -DCATCH_BUILD_EXAMPLES=ON
+            cmake_configurations: -DCATCH_BUILD_EXTRA_TESTS=ON -DCATCH_BUILD_EXAMPLES=ON -DCATCH_ENABLE_CMAKE_HELPER_TESTS=ON
           - cxx: g++-7
             build_description: Extras + Examples
             build_type: Release
             std: 14
             other_pkgs: g++-7
-            cmake_configurations: -DCATCH_BUILD_EXTRA_TESTS=ON -DCATCH_BUILD_EXAMPLES=ON
+            cmake_configurations: -DCATCH_BUILD_EXTRA_TESTS=ON -DCATCH_BUILD_EXAMPLES=ON -DCATCH_ENABLE_CMAKE_HELPER_TESTS=ON
 
           # Extras and examples with Clang-10
           - cxx: clang++-10
@@ -43,13 +43,13 @@ jobs:
             build_type: Debug
             std: 17
             other_pkgs: clang-10
-            cmake_configurations: -DCATCH_BUILD_EXTRA_TESTS=ON -DCATCH_BUILD_EXAMPLES=ON
+            cmake_configurations: -DCATCH_BUILD_EXTRA_TESTS=ON -DCATCH_BUILD_EXAMPLES=ON -DCATCH_ENABLE_CMAKE_HELPER_TESTS=ON
           - cxx: clang++-10
             build_description: Extras + Examples
             build_type: Release
             std: 17
             other_pkgs: clang-10
-            cmake_configurations: -DCATCH_BUILD_EXTRA_TESTS=ON -DCATCH_BUILD_EXAMPLES=ON
+            cmake_configurations: -DCATCH_BUILD_EXTRA_TESTS=ON -DCATCH_BUILD_EXAMPLES=ON -DCATCH_ENABLE_CMAKE_HELPER_TESTS=ON
 
           # Configure tests with Clang-10
           - cxx: clang++-10
@@ -70,10 +70,12 @@ jobs:
 
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Prepare environment
-      run: sudo apt-get install -y ninja-build ${{matrix.other_pkgs}}
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y ninja-build ${{matrix.other_pkgs}}
 
     - name: Configure build
       working-directory: ${{runner.workspace}}
@@ -100,5 +102,53 @@ jobs:
       env:
           CTEST_OUTPUT_ON_FAILURE: 1
       working-directory: ${{runner.workspace}}/build
-      # Hardcode 2 cores we know are there
-      run: ctest -C ${{matrix.build_type}} -j 2 ${{matrix.other_ctest_args}}
+      run: ctest -C ${{matrix.build_type}} -j `nproc` ${{matrix.other_ctest_args}}
+  clang-tidy:
+    name: clang-tidy ${{matrix.version}}, ${{matrix.build_description}}, C++${{matrix.std}} ${{matrix.build_type}}
+    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        include:
+          - version: "15"
+            build_description: all
+            build_type: Debug
+            std: 17
+            other_pkgs: ''
+            cmake_configurations: -DCATCH_BUILD_EXAMPLES=ON -DCATCH_ENABLE_CMAKE_HELPER_TESTS=ON
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Prepare environment
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y ninja-build clang-${{matrix.version}} clang-tidy-${{matrix.version}} ${{matrix.other_pkgs}}
+
+    - name: Configure build
+      working-directory: ${{runner.workspace}}
+      env:
+        CXX: clang++-${{matrix.version}}
+        CXXFLAGS: ${{matrix.cxxflags}}
+      # Note: $GITHUB_WORKSPACE is distinct from ${{runner.workspace}}.
+      #       This is important
+      run: |
+        clangtidy="clang-tidy-${{matrix.version}};-use-color"
+        # Use a dummy compiler/linker/ar/ranlib to effectively disable the
+        # compilation and only run clang-tidy.
+        cmake -Bbuild -H$GITHUB_WORKSPACE \
+              -DCMAKE_BUILD_TYPE=${{matrix.build_type}} \
+              -DCMAKE_CXX_STANDARD=${{matrix.std}} \
+              -DCMAKE_CXX_STANDARD_REQUIRED=ON \
+              -DCMAKE_CXX_EXTENSIONS=OFF \
+              -DCATCH_DEVELOPMENT_BUILD=ON \
+              -DCMAKE_CXX_CLANG_TIDY="$clangtidy" \
+              -DCMAKE_CXX_COMPILER_LAUNCHER=/usr/bin/true \
+              -DCMAKE_AR=/usr/bin/true \
+              -DCMAKE_CXX_COMPILER_AR=/usr/bin/true \
+              -DCMAKE_RANLIB=/usr/bin/true \
+              -DCMAKE_CXX_LINK_EXECUTABLE=/usr/bin/true \
+              ${{matrix.cmake_configurations}} \
+              -G Ninja
+
+    - name: Run clang-tidy
+      working-directory: ${{runner.workspace}}/build
+      run: ninja

.github/workflows/linux-simple-builds.yml

@@ -83,7 +83,7 @@ jobs:
             other_pkgs: g++-10
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Add repositories for older GCC
       run: |
@@ -92,7 +92,9 @@ jobs:
       if: ${{ matrix.cxx == 'g++-5' || matrix.cxx == 'g++-6' }}
 
     - name: Prepare environment
-      run: sudo apt-get install -y ninja-build ${{matrix.other_pkgs}}
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y ninja-build ${{matrix.other_pkgs}}
 
     - name: Configure build
       working-directory: ${{runner.workspace}}
@@ -118,5 +120,4 @@ jobs:
       env:
           CTEST_OUTPUT_ON_FAILURE: 1
       working-directory: ${{runner.workspace}}/build
-      # Hardcode 2 cores we know are there
-      run: ctest -C ${{matrix.build_type}} -j 2
+      run: ctest -C ${{matrix.build_type}} -j `nproc`

.github/workflows/mac-builds-m1.yml

@@ -0,0 +1,44 @@
+name: M1 Mac builds
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: macos-14
+    strategy:
+      matrix:
+        cxx:
+          - clang++
+        build_type: [Debug, Release]
+        std: [14, 17]
+        include:
+          - build_type: Debug
+            examples: ON
+            extra_tests: ON
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Configure build
+      working-directory: ${{runner.workspace}}
+      env:
+        CXX: ${{matrix.cxx}}
+        CXXFLAGS: ${{matrix.cxxflags}}
+      run: |
+        cmake -Bbuild -H$GITHUB_WORKSPACE \
+              -DCMAKE_BUILD_TYPE=${{matrix.build_type}} \
+              -DCMAKE_CXX_STANDARD=${{matrix.std}} \
+              -DCMAKE_CXX_STANDARD_REQUIRED=ON \
+              -DCATCH_DEVELOPMENT_BUILD=ON \
+              -DCATCH_BUILD_EXAMPLES=${{matrix.examples}} \
+              -DCATCH_BUILD_EXTRA_TESTS=${{matrix.examples}}
+
+    - name: Build tests + lib
+      working-directory: ${{runner.workspace}}/build
+      run: make -j `sysctl -n hw.ncpu`
+
+    - name: Run tests
+      env:
+          CTEST_OUTPUT_ON_FAILURE: 1
+      working-directory: ${{runner.workspace}}/build
+      run: ctest -C ${{matrix.build_type}} -j `sysctl -n hw.ncpu`

.github/workflows/mac-builds.yml

@@ -4,15 +4,10 @@ on: [push, pull_request]
 
 jobs:
   build:
-    # macos-12 updated to a toolchain that crashes when linking the
-    # test binary. This seems to be a known bug in that version,
-    # and will eventually get fixed in an update. After that, we can go
-    # back to newer macos images.
-    runs-on: macos-11
+    runs-on: macos-12
     strategy:
       matrix:
         cxx:
-          - g++-11
           - clang++
         build_type: [Debug, Release]
         std: [14, 17]
@@ -22,15 +17,13 @@ jobs:
             extra_tests: ON
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Configure build
       working-directory: ${{runner.workspace}}
       env:
         CXX: ${{matrix.cxx}}
         CXXFLAGS: ${{matrix.cxxflags}}
-      # Note: $GITHUB_WORKSPACE is distinct from ${{runner.workspace}}.
-      #       This is important
       run: |
         cmake -Bbuild -H$GITHUB_WORKSPACE \
               -DCMAKE_BUILD_TYPE=${{matrix.build_type}} \
@@ -42,11 +35,10 @@ jobs:
 
     - name: Build tests + lib
       working-directory: ${{runner.workspace}}/build
-      run: make -j 2
+      run: make -j `sysctl -n hw.ncpu`
 
     - name: Run tests
       env:
           CTEST_OUTPUT_ON_FAILURE: 1
       working-directory: ${{runner.workspace}}/build
-      # Hardcode 2 cores we know are there
-      run: ctest -C ${{matrix.build_type}} -j 2
+      run: ctest -C ${{matrix.build_type}} -j `sysctl -n hw.ncpu`

.github/workflows/package-manager-builds.yaml

@@ -0,0 +1,31 @@
+name: Package Manager Builds
+
+on: [push, pull_request]
+
+jobs:
+  conan_builds:
+    name: Conan ${{matrix.conan_version}}
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        conan_version:
+          - '1.63'
+          - '2.1'
+
+        include:
+          # Conan 1 has default profiles installed
+          - conan_version: '1.63'
+            profile_generate: 'false'
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install conan
+      run: pip install conan==${{matrix.conan_version}}
+
+    - name: Setup conan profiles
+      if: matrix.profile_generate != 'false'
+      run: conan profile detect
+
+    - name: Run conan package create
+      run: conan create . -tf .conan/test_package

.github/workflows/validate-header-guards.yml

@@ -9,7 +9,7 @@ jobs:
     steps:
 
       - name: Checkout source code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Setup Dependencies
         uses: actions/setup-python@v2

.github/workflows/windows-simple-builds.yml

@@ -13,7 +13,7 @@ jobs:
         build_type: [Debug, Release]
         std: [14, 17]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Configure build
         working-directory: ${{runner.workspace}}

.gitignore

@@ -25,7 +25,9 @@ Build
 cmake-build-*
 benchmark-dir
 .conan/test_package/build
+**/CMakeUserPresets.json
 bazel-*
+MODULE.bazel.lock
 build-fuzzers
 debug-build
 .vscode
@@ -35,3 +37,4 @@ msvc-sln*
 docs/doxygen
 *.cache
 compile_commands.json
+**/*.unapproved.txt

BUILD.bazel

@@ -43,12 +43,15 @@ expand_template(
         "#cmakedefine CATCH_CONFIG_NO_GLOBAL_NEXTAFTER": "",
         "#cmakedefine CATCH_CONFIG_NO_POSIX_SIGNALS": "",
         "#cmakedefine CATCH_CONFIG_NO_USE_ASYNC": "",
+        "#cmakedefine CATCH_CONFIG_NO_EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT": "",
         "#cmakedefine CATCH_CONFIG_NO_WCHAR": "",
         "#cmakedefine CATCH_CONFIG_NO_WINDOWS_SEH": "",
         "#cmakedefine CATCH_CONFIG_NOSTDOUT": "",
         "#cmakedefine CATCH_CONFIG_POSIX_SIGNALS": "",
         "#cmakedefine CATCH_CONFIG_PREFIX_ALL": "",
+        "#cmakedefine CATCH_CONFIG_PREFIX_MESSAGES": "",
         "#cmakedefine CATCH_CONFIG_SHARED_LIBRARY": "",
+        "#cmakedefine CATCH_CONFIG_EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT": "",
         "#cmakedefine CATCH_CONFIG_USE_ASYNC": "",
         "#cmakedefine CATCH_CONFIG_WCHAR": "",
         "#cmakedefine CATCH_CONFIG_WINDOWS_CRTDBG": "",

CMake/CatchConfigOptions.cmake

@@ -18,10 +18,12 @@
 macro(AddOverridableConfigOption OptionBaseName)
   option(CATCH_CONFIG_${OptionBaseName} "Read docs/configuration.md for details" OFF)
   option(CATCH_CONFIG_NO_${OptionBaseName} "Read docs/configuration.md for details" OFF)
+  mark_as_advanced(CATCH_CONFIG_${OptionBaseName} CATCH_CONFIG_NO_${OptionBaseName})
 endmacro()
 
 macro(AddConfigOption OptionBaseName)
   option(CATCH_CONFIG_${OptionBaseName} "Read docs/configuration.md for details" OFF)
+  mark_as_advanced(CATCH_CONFIG_${OptionBaseName})
 endmacro()
 
 set(_OverridableOptions
@@ -41,6 +43,7 @@ set(_OverridableOptions
   "WCHAR"
   "WINDOWS_SEH"
   "GETENV"
+  "EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT"
 )
 
 foreach(OptionName ${_OverridableOptions})
@@ -61,6 +64,7 @@ set(_OtherConfigOptions
   "FAST_COMPILE"
   "NOSTDOUT"
   "PREFIX_ALL"
+  "PREFIX_MESSAGES"
   "WINDOWS_CRTDBG"
 )
 
@@ -68,11 +72,17 @@ set(_OtherConfigOptions
 foreach(OptionName ${_OtherConfigOptions})
   AddConfigOption(${OptionName})
 endforeach()
-set(CATCH_CONFIG_SHARED_LIBRARY ${BUILD_SHARED_LIBS})
+if(DEFINED BUILD_SHARED_LIBS)
+    set(CATCH_CONFIG_SHARED_LIBRARY ${BUILD_SHARED_LIBS})
+else()
+    set(CATCH_CONFIG_SHARED_LIBRARY "")
+endif()
 
 set(CATCH_CONFIG_DEFAULT_REPORTER "console" CACHE STRING "Read docs/configuration.md for details. The name of the reporter should be without quotes.")
 set(CATCH_CONFIG_CONSOLE_WIDTH "80" CACHE STRING "Read docs/configuration.md for details. Must form a valid integer literal.")
 
+mark_as_advanced(CATCH_CONFIG_SHARED_LIBRARY CATCH_CONFIG_DEFAULT_REPORTER CATCH_CONFIG_CONSOLE_WIDTH)
+
 # There is no good way to both turn this into a CMake cache variable,
 # and keep reasonable default semantics inside the project. Thus we do
 # not define it and users have to provide it as an outside variable.

CMake/CatchMiscFunctions.cmake

@@ -46,7 +46,6 @@ function(add_warnings_to_targets targets)
         set(CHECKED_WARNING_FLAGS
           "-Wabsolute-value"
           "-Wall"
-          "-Wc++20-compat"
           "-Wcall-to-pure-virtual-from-ctor-dtor"
           "-Wcast-align"
           "-Wcatch-value"
@@ -69,21 +68,24 @@ function(add_warnings_to_targets targets)
           "-Wmissing-noreturn"
           "-Wmissing-prototypes"
           "-Wmissing-variable-declarations"
+          "-Wnon-virtual-dtor"
           "-Wnull-dereference"
           "-Wold-style-cast"
           "-Woverloaded-virtual"
           "-Wparentheses"
           "-Wpedantic"
+          "-Wredundant-decls"
           "-Wreorder"
           "-Wreturn-std-move"
           "-Wshadow"
           "-Wstrict-aliasing"
+          "-Wsubobject-linkage"
           "-Wsuggest-destructor-override"
           "-Wsuggest-override"
           "-Wundef"
           "-Wuninitialized"
           "-Wunneeded-internal-declaration"
-          "-Wunreachable-code"
+          "-Wunreachable-code-aggressive"
           "-Wunused"
           "-Wunused-function"
           "-Wunused-parameter"

CMakeLists.txt

@@ -11,6 +11,7 @@ endif()
 option(CATCH_INSTALL_DOCS "Install documentation alongside library" ON)
 option(CATCH_INSTALL_EXTRAS "Install extras (CMake scripts, debugger helpers) alongside library" ON)
 option(CATCH_DEVELOPMENT_BUILD "Build tests, enable warnings, enable Werror, etc" OFF)
+option(CATCH_ENABLE_REPRODUCIBLE_BUILD "Add compiler flags for improving build reproducibility" ON)
 
 include(CMakeDependentOption)
 cmake_dependent_option(CATCH_BUILD_TESTING "Build the SelfTest project" ON "CATCH_DEVELOPMENT_BUILD" OFF)
@@ -21,6 +22,7 @@ cmake_dependent_option(CATCH_ENABLE_COVERAGE "Generate coverage for codecov.io"
 cmake_dependent_option(CATCH_ENABLE_WERROR "Enables Werror during build" ON "CATCH_DEVELOPMENT_BUILD" OFF)
 cmake_dependent_option(CATCH_BUILD_SURROGATES "Enable generating and building surrogate TUs for the main headers" OFF "CATCH_DEVELOPMENT_BUILD" OFF)
 cmake_dependent_option(CATCH_ENABLE_CONFIGURE_TESTS "Enable CMake configuration tests. WARNING: VERY EXPENSIVE" OFF "CATCH_DEVELOPMENT_BUILD" OFF)
+cmake_dependent_option(CATCH_ENABLE_CMAKE_HELPER_TESTS "Enable CMake helper tests. WARNING: VERY EXPENSIVE" OFF "CATCH_DEVELOPMENT_BUILD" OFF)
 
 
 # Catch2's build breaks if done in-tree. You probably should not build
@@ -31,7 +33,7 @@ if (CMAKE_BINARY_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
 endif()
 
 project(Catch2
-  VERSION 3.3.2 # CML version placeholder, don't delete
+  VERSION 3.7.0 # CML version placeholder, don't delete
   LANGUAGES CXX
   # HOMEPAGE_URL is not supported until CMake version 3.12, which
   # we do not target yet.
@@ -74,8 +76,6 @@ endif()
 set(CATCH_DIR ${CMAKE_CURRENT_SOURCE_DIR})
 set(SOURCES_DIR ${CATCH_DIR}/src/catch2)
 set(SELF_TEST_DIR ${CATCH_DIR}/tests/SelfTest)
-set(BENCHMARK_DIR ${CATCH_DIR}/tests/Benchmark)
-set(EXAMPLES_DIR ${CATCH_DIR}/examples)
 
 # We need to bring-in the variables defined there to this scope
 add_subdirectory(src)
@@ -148,6 +148,8 @@ if (NOT_SUBPROJECT)
             "extras/ParseAndAddCatchTests.cmake"
             "extras/Catch.cmake"
             "extras/CatchAddTests.cmake"
+            "extras/CatchShardTests.cmake"
+            "extras/CatchShardTestsImpl.cmake"
           DESTINATION
             ${CATCH_CMAKE_CONFIG_DESTINATION}
         )
@@ -196,4 +198,4 @@ if (NOT_SUBPROJECT)
 
     include( CPack )
 
-endif(NOT_SUBPROJECT)
+endif()

CMakePresets.json

@@ -18,7 +18,8 @@
                 "CATCH_BUILD_EXAMPLES": "ON",
                 "CATCH_BUILD_EXTRA_TESTS": "ON",
                 "CATCH_BUILD_SURROGATES": "ON",
-                "CATCH_ENABLE_CONFIGURE_TESTS": "ON"
+                "CATCH_ENABLE_CONFIGURE_TESTS": "ON",
+                "CATCH_ENABLE_CMAKE_HELPER_TESTS": "ON"
             }
         }
     ]   

Doxyfile

@@ -1,4 +1,4 @@
-# Doxyfile 1.8.16
+# Doxyfile 1.9.1
 
 # This file describes the settings to be used by the documentation system
 # doxygen (www.doxygen.org) for a project.
@@ -32,7 +32,7 @@ DOXYFILE_ENCODING      = UTF-8
 # title of most generated pages and in a few other places.
 # The default value is: My Project.
 
-PROJECT_NAME           = "Catch2"
+PROJECT_NAME           = Catch2
 
 # The PROJECT_NUMBER tag can be used to enter a project or revision number. This
 # could be handy for archiving the generated documentation or if some version
@@ -51,6 +51,7 @@ PROJECT_BRIEF          = "Popular C++ unit testing framework"
 # pixels and the maximum width should not exceed 200 pixels. Doxygen will copy
 # the logo to the output directory.
 
+PROJECT_LOGO           =
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) path
 # into which the generated documentation will be written. If a relative path is
@@ -216,6 +217,14 @@ QT_AUTOBRIEF           = YES
 
 MULTILINE_CPP_IS_BRIEF = NO
 
+# By default Python docstrings are displayed as preformatted text and doxygen's
+# special commands cannot be used. By setting PYTHON_DOCSTRING to NO the
+# doxygen's special commands can be used and the contents of the docstring
+# documentation blocks is shown as doxygen documentation.
+# The default value is: YES.
+
+PYTHON_DOCSTRING       = YES
+
 # If the INHERIT_DOCS tag is set to YES then an undocumented member inherits the
 # documentation from any documented member that it re-implements.
 # The default value is: YES.
@@ -251,13 +260,7 @@ TAB_SIZE               = 4
 # a double escape (\\{ and \\})
 
 ALIASES                = "complexity=@par Complexity:" \
-                         "noexcept=**Noexcept**"
-
-# This tag can be used to specify a number of word-keyword mappings (TCL only).
-# A mapping has the form "name=value". For example adding "class=itcl::class"
-# will allow you to use the command class in the itcl::class meaning.
-
-TCL_SUBST              =
+                         noexcept=**Noexcept**
 
 # Set the OPTIMIZE_OUTPUT_FOR_C tag to YES if your project consists of C sources
 # only. Doxygen will then generate output that is more tailored for C. For
@@ -299,19 +302,22 @@ OPTIMIZE_OUTPUT_SLICE  = NO
 # parses. With this tag you can assign which parser to use for a given
 # extension. Doxygen has a built-in mapping, but you can override or extend it
 # using this tag. The format is ext=language, where ext is a file extension, and
-# language is one of the parsers supported by doxygen: IDL, Java, Javascript,
-# Csharp (C#), C, C++, D, PHP, md (Markdown), Objective-C, Python, Slice,
+# language is one of the parsers supported by doxygen: IDL, Java, JavaScript,
+# Csharp (C#), C, C++, D, PHP, md (Markdown), Objective-C, Python, Slice, VHDL,
 # Fortran (fixed format Fortran: FortranFixed, free formatted Fortran:
 # FortranFree, unknown formatted Fortran: Fortran. In the later case the parser
 # tries to guess whether the code is fixed or free formatted code, this is the
-# default for Fortran type files), VHDL, tcl. For instance to make doxygen treat
-# .inc files as Fortran files (default is PHP), and .f files as C (default is
-# Fortran), use: inc=Fortran f=C.
+# default for Fortran type files). For instance to make doxygen treat .inc files
+# as Fortran files (default is PHP), and .f files as C (default is Fortran),
+# use: inc=Fortran f=C.
 #
 # Note: For files without extension you can use no_extension as a placeholder.
 #
 # Note that for custom extensions you also need to set FILE_PATTERNS otherwise
-# the files are not read by doxygen.
+# the files are not read by doxygen. When specifying no_extension you should add
+# * to the FILE_PATTERNS.
+#
+# Note see also the list of default file extension mappings.
 
 EXTENSION_MAPPING      =
 
@@ -445,6 +451,19 @@ TYPEDEF_HIDES_STRUCT   = NO
 
 LOOKUP_CACHE_SIZE      = 0
 
+# The NUM_PROC_THREADS specifies the number threads doxygen is allowed to use
+# during processing. When set to 0 doxygen will based this on the number of
+# cores available in the system. You can set it explicitly to a value larger
+# than 0 to get more control over the balance between CPU load and processing
+# speed. At this moment only the input processing can be done using multiple
+# threads. Since this is still an experimental feature the default is set to 1,
+# which efficively disables parallel processing. Please report any issues you
+# encounter. Generating dot graphs in parallel is controlled by the
+# DOT_NUM_THREADS setting.
+# Minimum value: 0, maximum value: 32, default value: 1.
+
+NUM_PROC_THREADS       = 1
+
 #---------------------------------------------------------------------------
 # Build related configuration options
 #---------------------------------------------------------------------------
@@ -508,6 +527,13 @@ EXTRACT_LOCAL_METHODS  = NO
 
 EXTRACT_ANON_NSPACES   = NO
 
+# If this flag is set to YES, the name of an unnamed parameter in a declaration
+# will be determined by the corresponding definition. By default unnamed
+# parameters remain unnamed in the output.
+# The default value is: YES.
+
+RESOLVE_UNNAMED_PARAMS = YES
+
 # If the HIDE_UNDOC_MEMBERS tag is set to YES, doxygen will hide all
 # undocumented members inside documented classes or files. If set to NO these
 # members will be included in the various overviews, but no documentation
@@ -525,8 +551,8 @@ HIDE_UNDOC_MEMBERS     = NO
 HIDE_UNDOC_CLASSES     = NO
 
 # If the HIDE_FRIEND_COMPOUNDS tag is set to YES, doxygen will hide all friend
-# (class|struct|union) declarations. If set to NO, these declarations will be
-# included in the documentation.
+# declarations. If set to NO, these declarations will be included in the
+# documentation.
 # The default value is: NO.
 
 HIDE_FRIEND_COMPOUNDS  = NO
@@ -545,11 +571,18 @@ HIDE_IN_BODY_DOCS      = NO
 
 INTERNAL_DOCS          = NO
 
-# If the CASE_SENSE_NAMES tag is set to NO then doxygen will only generate file
-# names in lower-case letters. If set to YES, upper-case letters are also
-# allowed. This is useful if you have classes or files whose names only differ
-# in case and if your file system supports case sensitive file names. Windows
-# (including Cygwin) ands Mac users are advised to set this option to NO.
+# With the correct setting of option CASE_SENSE_NAMES doxygen will better be
+# able to match the capabilities of the underlying filesystem. In case the
+# filesystem is case sensitive (i.e. it supports files in the same directory
+# whose names only differ in casing), the option must be set to YES to properly
+# deal with such files in case they appear in the input. For filesystems that
+# are not case sensitive the option should be be set to NO to properly deal with
+# output files written for symbols that only differ in casing, such as for two
+# classes, one named CLASS and the other named Class, and to also support
+# references to files without having to specify the exact matching casing. On
+# Windows (including Cygwin) and MacOS, users should typically set this option
+# to NO, whereas on Linux or other Unix flavors it should typically be set to
+# YES.
 # The default value is: system dependent.
 
 CASE_SENSE_NAMES       = NO
@@ -788,7 +821,10 @@ WARN_IF_DOC_ERROR      = YES
 WARN_NO_PARAMDOC       = YES
 
 # If the WARN_AS_ERROR tag is set to YES then doxygen will immediately stop when
-# a warning is encountered.
+# a warning is encountered. If the WARN_AS_ERROR tag is set to FAIL_ON_WARNINGS
+# then doxygen will continue running as if WARN_AS_ERROR tag is set to NO, but
+# at the end of the doxygen process doxygen will return with a non-zero status.
+# Possible values are: NO, YES and FAIL_ON_WARNINGS.
 # The default value is: NO.
 
 WARN_AS_ERROR          = NO
@@ -819,13 +855,13 @@ WARN_LOGFILE           = doxygen.errors
 # spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
 # Note: If this tag is empty the current directory is searched.
 
-INPUT  = "src/catch2"
+INPUT                  = src/catch2
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses
 # libiconv (or the iconv built into libc) for the transcoding. See the libiconv
-# documentation (see: https://www.gnu.org/software/libiconv/) for the list of
-# possible encodings.
+# documentation (see:
+# https://www.gnu.org/software/libiconv/) for the list of possible encodings.
 # The default value is: UTF-8.
 
 INPUT_ENCODING         = UTF-8
@@ -838,13 +874,61 @@ INPUT_ENCODING         = UTF-8
 # need to set EXTENSION_MAPPING for the extension otherwise the files are not
 # read by doxygen.
 #
+# Note the list of default checked file patterns might differ from the list of
+# default file extension mappings.
+#
 # If left blank the following patterns are tested:*.c, *.cc, *.cxx, *.cpp,
 # *.c++, *.java, *.ii, *.ixx, *.ipp, *.i++, *.inl, *.idl, *.ddl, *.odl, *.h,
 # *.hh, *.hxx, *.hpp, *.h++, *.cs, *.d, *.php, *.php4, *.php5, *.phtml, *.inc,
-# *.m, *.markdown, *.md, *.mm, *.dox, *.py, *.pyw, *.f90, *.f95, *.f03, *.f08,
-# *.f, *.for, *.tcl, *.vhd, *.vhdl, *.ucf, *.qsf and *.ice.
+# *.m, *.markdown, *.md, *.mm, *.dox (to be provided as doxygen C comment),
+# *.py, *.pyw, *.f90, *.f95, *.f03, *.f08, *.f18, *.f, *.for, *.vhd, *.vhdl,
+# *.ucf, *.qsf and *.ice.
 
-# FILE_PATTERNS          =
+FILE_PATTERNS          = *.c \
+                         *.cc \
+                         *.cxx \
+                         *.cpp \
+                         *.c++ \
+                         *.java \
+                         *.ii \
+                         *.ixx \
+                         *.ipp \
+                         *.i++ \
+                         *.inl \
+                         *.idl \
+                         *.ddl \
+                         *.odl \
+                         *.h \
+                         *.hh \
+                         *.hxx \
+                         *.hpp \
+                         *.h++ \
+                         *.cs \
+                         *.d \
+                         *.php \
+                         *.php4 \
+                         *.php5 \
+                         *.phtml \
+                         *.inc \
+                         *.m \
+                         *.markdown \
+                         *.md \
+                         *.mm \
+                         *.dox \
+                         *.py \
+                         *.pyw \
+                         *.f90 \
+                         *.f95 \
+                         *.f03 \
+                         *.f08 \
+                         *.f18 \
+                         *.f \
+                         *.for \
+                         *.vhd \
+                         *.vhdl \
+                         *.ucf \
+                         *.qsf \
+                         *.ice
 
 # The RECURSIVE tag can be used to specify whether or not subdirectories should
 # be searched for input files as well.
@@ -968,6 +1052,7 @@ FILTER_SOURCE_PATTERNS =
 # (index.html). This can be useful if you have a project on for instance GitHub
 # and want to reuse the introduction page also for the doxygen output.
 
+USE_MDFILE_AS_MAINPAGE =
 
 #---------------------------------------------------------------------------
 # Configuration options related to source browsing
@@ -1055,6 +1140,44 @@ USE_HTAGS              = NO
 
 VERBATIM_HEADERS       = YES
 
+# If the CLANG_ASSISTED_PARSING tag is set to YES then doxygen will use the
+# clang parser (see:
+# http://clang.llvm.org/) for more accurate parsing at the cost of reduced
+# performance. This can be particularly helpful with template rich C++ code for
+# which doxygen's built-in parser lacks the necessary type information.
+# Note: The availability of this option depends on whether or not doxygen was
+# generated with the -Duse_libclang=ON option for CMake.
+# The default value is: NO.
+
+CLANG_ASSISTED_PARSING = NO
+
+# If clang assisted parsing is enabled and the CLANG_ADD_INC_PATHS tag is set to
+# YES then doxygen will add the directory of each input to the include path.
+# The default value is: YES.
+
+CLANG_ADD_INC_PATHS    = YES
+
+# If clang assisted parsing is enabled you can provide the compiler with command
+# line options that you would normally use when invoking the compiler. Note that
+# the include paths will already be set by doxygen for the files and directories
+# specified with INPUT and INCLUDE_PATH.
+# This tag requires that the tag CLANG_ASSISTED_PARSING is set to YES.
+
+CLANG_OPTIONS          =
+
+# If clang assisted parsing is enabled you can provide the clang parser with the
+# path to the directory containing a file called compile_commands.json. This
+# file is the compilation database (see:
+# http://clang.llvm.org/docs/HowToSetupToolingForLLVM.html) containing the
+# options used when the source files were built. This is equivalent to
+# specifying the -p option to a clang tool, such as clang-check. These options
+# will then be passed to the parser. Any options specified with CLANG_OPTIONS
+# will be added as well.
+# Note: The availability of this option depends on whether or not doxygen was
+# generated with the -Duse_libclang=ON option for CMake.
+
+CLANG_DATABASE_PATH    =
+
 #---------------------------------------------------------------------------
 # Configuration options related to the alphabetical class index
 #---------------------------------------------------------------------------
@@ -1066,13 +1189,6 @@ VERBATIM_HEADERS       = YES
 
 ALPHABETICAL_INDEX     = YES
 
-# The COLS_IN_ALPHA_INDEX tag can be used to specify the number of columns in
-# which the alphabetical index list will be split.
-# Minimum value: 1, maximum value: 20, default value: 5.
-# This tag requires that the tag ALPHABETICAL_INDEX is set to YES.
-
-COLS_IN_ALPHA_INDEX    = 5
-
 # In case all classes in a project start with a common prefix, all classes will
 # be put under the same header in the alphabetical index. The IGNORE_PREFIX tag
 # can be used to specify a prefix (or a list of prefixes) that should be ignored
@@ -1211,9 +1327,9 @@ HTML_TIMESTAMP         = NO
 
 # If the HTML_DYNAMIC_MENUS tag is set to YES then the generated HTML
 # documentation will contain a main index with vertical navigation menus that
-# are dynamically created via Javascript. If disabled, the navigation index will
+# are dynamically created via JavaScript. If disabled, the navigation index will
 # consists of multiple levels of tabs that are statically embedded in every HTML
-# page. Disable this option to support browsers that do not have Javascript,
+# page. Disable this option to support browsers that do not have JavaScript,
 # like the Qt help browser.
 # The default value is: YES.
 # This tag requires that the tag GENERATE_HTML is set to YES.
@@ -1243,10 +1359,11 @@ HTML_INDEX_NUM_ENTRIES = 100
 
 # If the GENERATE_DOCSET tag is set to YES, additional index files will be
 # generated that can be used as input for Apple's Xcode 3 integrated development
-# environment (see: https://developer.apple.com/xcode/), introduced with OSX
-# 10.5 (Leopard). To create a documentation set, doxygen will generate a
-# Makefile in the HTML output directory. Running make will produce the docset in
-# that directory and running make install will install the docset in
+# environment (see:
+# https://developer.apple.com/xcode/), introduced with OSX 10.5 (Leopard). To
+# create a documentation set, doxygen will generate a Makefile in the HTML
+# output directory. Running make will produce the docset in that directory and
+# running make install will install the docset in
 # ~/Library/Developer/Shared/Documentation/DocSets so that Xcode will find it at
 # startup. See https://developer.apple.com/library/archive/featuredarticles/Doxy
 # genXcode/_index.html for more information.
@@ -1288,8 +1405,8 @@ DOCSET_PUBLISHER_NAME  = Publisher
 # If the GENERATE_HTMLHELP tag is set to YES then doxygen generates three
 # additional HTML index files: index.hhp, index.hhc, and index.hhk. The
 # index.hhp is a project file that can be read by Microsoft's HTML Help Workshop
-# (see: https://www.microsoft.com/en-us/download/details.aspx?id=21138) on
-# Windows.
+# (see:
+# https://www.microsoft.com/en-us/download/details.aspx?id=21138) on Windows.
 #
 # The HTML Help Workshop contains a compiler that can convert all HTML output
 # generated by doxygen into a single compiled HTML file (.chm). Compiled HTML
@@ -1364,7 +1481,8 @@ QCH_FILE               =
 
 # The QHP_NAMESPACE tag specifies the namespace to use when generating Qt Help
 # Project output. For more information please see Qt Help Project / Namespace
-# (see: https://doc.qt.io/archives/qt-4.8/qthelpproject.html#namespace).
+# (see:
+# https://doc.qt.io/archives/qt-4.8/qthelpproject.html#namespace).
 # The default value is: org.doxygen.Project.
 # This tag requires that the tag GENERATE_QHP is set to YES.
 
@@ -1372,8 +1490,8 @@ QHP_NAMESPACE          = org.doxygen.Project
 
 # The QHP_VIRTUAL_FOLDER tag specifies the namespace to use when generating Qt
 # Help Project output. For more information please see Qt Help Project / Virtual
-# Folders (see: https://doc.qt.io/archives/qt-4.8/qthelpproject.html#virtual-
-# folders).
+# Folders (see:
+# https://doc.qt.io/archives/qt-4.8/qthelpproject.html#virtual-folders).
 # The default value is: doc.
 # This tag requires that the tag GENERATE_QHP is set to YES.
 
@@ -1381,16 +1499,16 @@ QHP_VIRTUAL_FOLDER     = doc
 
 # If the QHP_CUST_FILTER_NAME tag is set, it specifies the name of a custom
 # filter to add. For more information please see Qt Help Project / Custom
-# Filters (see: https://doc.qt.io/archives/qt-4.8/qthelpproject.html#custom-
-# filters).
+# Filters (see:
+# https://doc.qt.io/archives/qt-4.8/qthelpproject.html#custom-filters).
 # This tag requires that the tag GENERATE_QHP is set to YES.
 
 QHP_CUST_FILTER_NAME   =
 
 # The QHP_CUST_FILTER_ATTRS tag specifies the list of the attributes of the
 # custom filter to add. For more information please see Qt Help Project / Custom
-# Filters (see: https://doc.qt.io/archives/qt-4.8/qthelpproject.html#custom-
-# filters).
+# Filters (see:
+# https://doc.qt.io/archives/qt-4.8/qthelpproject.html#custom-filters).
 # This tag requires that the tag GENERATE_QHP is set to YES.
 
 QHP_CUST_FILTER_ATTRS  =
@@ -1402,9 +1520,9 @@ QHP_CUST_FILTER_ATTRS  =
 
 QHP_SECT_FILTER_ATTRS  =
 
-# The QHG_LOCATION tag can be used to specify the location of Qt's
-# qhelpgenerator. If non-empty doxygen will try to run qhelpgenerator on the
-# generated .qhp file.
+# The QHG_LOCATION tag can be used to specify the location (absolute path
+# including file name) of Qt's qhelpgenerator. If non-empty doxygen will try to
+# run qhelpgenerator on the generated .qhp file.
 # This tag requires that the tag GENERATE_QHP is set to YES.
 
 QHG_LOCATION           =
@@ -1481,6 +1599,17 @@ TREEVIEW_WIDTH         = 250
 
 EXT_LINKS_IN_WINDOW    = NO
 
+# If the HTML_FORMULA_FORMAT option is set to svg, doxygen will use the pdf2svg
+# tool (see https://github.com/dawbarton/pdf2svg) or inkscape (see
+# https://inkscape.org) to generate formulas as SVG images instead of PNGs for
+# the HTML output. These images will generally look nicer at scaled resolutions.
+# Possible values are: png (the default) and svg (looks nicer but requires the
+# pdf2svg or inkscape tool).
+# The default value is: png.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_FORMULA_FORMAT    = png
+
 # Use this tag to change the font size of LaTeX formulas included as images in
 # the HTML documentation. When you change the font size after a successful
 # doxygen run you need to manually remove any form_*.png images from the HTML
@@ -1501,8 +1630,14 @@ FORMULA_FONTSIZE       = 10
 
 FORMULA_TRANSPARENT    = YES
 
+# The FORMULA_MACROFILE can contain LaTeX \newcommand and \renewcommand commands
+# to create new LaTeX commands to be used in formulas as building blocks. See
+# the section "Including formulas" for details.
+
+FORMULA_MACROFILE      =
+
 # Enable the USE_MATHJAX option to render LaTeX formulas using MathJax (see
-# https://www.mathjax.org) which uses client side Javascript for the rendering
+# https://www.mathjax.org) which uses client side JavaScript for the rendering
 # instead of using pre-rendered bitmaps. Use this if you do not have LaTeX
 # installed or if you want to formulas look prettier in the HTML output. When
 # enabled you may also need to install MathJax separately and configure the path
@@ -1514,7 +1649,7 @@ USE_MATHJAX            = YES
 
 # When MathJax is enabled you can set the default output format to be used for
 # the MathJax output. See the MathJax site (see:
-# http://docs.mathjax.org/en/latest/output.html) for more details.
+# http://docs.mathjax.org/en/v2.7-latest/output.html) for more details.
 # Possible values are: HTML-CSS (which is slower, but has the best
 # compatibility), NativeMML (i.e. MathML) and SVG.
 # The default value is: HTML-CSS.
@@ -1530,7 +1665,7 @@ MATHJAX_FORMAT         = HTML-CSS
 # Content Delivery Network so you can quickly see the result without installing
 # MathJax. However, it is strongly recommended to install a local copy of
 # MathJax from https://www.mathjax.org before deployment.
-# The default value is: https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/.
+# The default value is: https://cdn.jsdelivr.net/npm/mathjax@2.
 # This tag requires that the tag USE_MATHJAX is set to YES.
 
 MATHJAX_RELPATH        = http://cdn.mathjax.org/mathjax/latest
@@ -1545,7 +1680,8 @@ MATHJAX_EXTENSIONS     = TeX/AMSmath \
 
 # The MATHJAX_CODEFILE tag can be used to specify a file with javascript pieces
 # of code that will be used on startup of the MathJax code. See the MathJax site
-# (see: http://docs.mathjax.org/en/latest/output.html) for more details. For an
+# (see:
+# http://docs.mathjax.org/en/v2.7-latest/output.html) for more details. For an
 # example see the documentation.
 # This tag requires that the tag USE_MATHJAX is set to YES.
 
@@ -1573,7 +1709,7 @@ MATHJAX_CODEFILE       =
 SEARCHENGINE           = YES
 
 # When the SERVER_BASED_SEARCH tag is enabled the search engine will be
-# implemented using a web server instead of a web client using Javascript. There
+# implemented using a web server instead of a web client using JavaScript. There
 # are two flavors of web server based searching depending on the EXTERNAL_SEARCH
 # setting. When disabled, doxygen will generate a PHP script for searching and
 # an index file used by the script. When EXTERNAL_SEARCH is enabled the indexing
@@ -1592,7 +1728,8 @@ SERVER_BASED_SEARCH    = NO
 #
 # Doxygen ships with an example indexer (doxyindexer) and search engine
 # (doxysearch.cgi) which are based on the open source search engine library
-# Xapian (see: https://xapian.org/).
+# Xapian (see:
+# https://xapian.org/).
 #
 # See the section "External Indexing and Searching" for details.
 # The default value is: NO.
@@ -1605,8 +1742,9 @@ EXTERNAL_SEARCH        = NO
 #
 # Doxygen ships with an example indexer (doxyindexer) and search engine
 # (doxysearch.cgi) which are based on the open source search engine library
-# Xapian (see: https://xapian.org/). See the section "External Indexing and
-# Searching" for details.
+# Xapian (see:
+# https://xapian.org/). See the section "External Indexing and Searching" for
+# details.
 # This tag requires that the tag SEARCHENGINE is set to YES.
 
 SEARCHENGINE_URL       =
@@ -1770,9 +1908,11 @@ LATEX_EXTRA_FILES      =
 
 PDF_HYPERLINKS         = YES
 
-# If the USE_PDFLATEX tag is set to YES, doxygen will use pdflatex to generate
-# the PDF file directly from the LaTeX files. Set this option to YES, to get a
-# higher quality PDF documentation.
+# If the USE_PDFLATEX tag is set to YES, doxygen will use the engine as
+# specified with LATEX_CMD_NAME to generate the PDF file directly from the LaTeX
+# files. Set this option to YES, to get a higher quality PDF documentation.
+#
+# See also section LATEX_CMD_NAME for selecting the engine.
 # The default value is: YES.
 # This tag requires that the tag GENERATE_LATEX is set to YES.
 
@@ -2204,7 +2344,7 @@ HIDE_UNDOC_RELATIONS   = YES
 # http://www.graphviz.org/), a graph visualization toolkit from AT&T and Lucent
 # Bell Labs. The other options in this section have no effect if this option is
 # set to NO
-# The default value is: NO.
+# The default value is: YES.
 
 HAVE_DOT               = YES
 
@@ -2283,10 +2423,32 @@ UML_LOOK               = NO
 # but if the number exceeds 15, the total amount of fields shown is limited to
 # 10.
 # Minimum value: 0, maximum value: 100, default value: 10.
-# This tag requires that the tag HAVE_DOT is set to YES.
+# This tag requires that the tag UML_LOOK is set to YES.
 
 UML_LIMIT_NUM_FIELDS   = 10
 
+# If the DOT_UML_DETAILS tag is set to NO, doxygen will show attributes and
+# methods without types and arguments in the UML graphs. If the DOT_UML_DETAILS
+# tag is set to YES, doxygen will add type and arguments for attributes and
+# methods in the UML graphs. If the DOT_UML_DETAILS tag is set to NONE, doxygen
+# will not generate fields with class member information in the UML graphs. The
+# class diagrams will look similar to the default class diagrams but using UML
+# notation for the relationships.
+# Possible values are: NO, YES and NONE.
+# The default value is: NO.
+# This tag requires that the tag UML_LOOK is set to YES.
+
+DOT_UML_DETAILS        = NO
+
+# The DOT_WRAP_THRESHOLD tag can be used to set the maximum number of characters
+# to display on a single line. If the actual line length exceeds this threshold
+# significantly it will wrapped across multiple lines. Some heuristics are apply
+# to avoid ugly line breaks.
+# Minimum value: 0, maximum value: 1000, default value: 17.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_WRAP_THRESHOLD     = 17
+
 # If the TEMPLATE_RELATIONS tag is set to YES then the inheritance and
 # collaboration graphs will show the relations between templates and their
 # instances.
@@ -2360,7 +2522,9 @@ DIRECTORY_GRAPH        = NO
 # Note: If you choose svg you need to set HTML_FILE_EXTENSION to xhtml in order
 # to make the SVG files visible in IE 9+ (other browsers do not have this
 # requirement).
-# Possible values are: png, jpg, gif, svg, png:gd, png:gd:gd, png:cairo,
+# Possible values are: png, png:cairo, png:cairo:cairo, png:cairo:gd, png:gd,
+# png:gd:gd, jpg, jpg:cairo, jpg:cairo:gd, jpg:gd, jpg:gd:gd, gif, gif:cairo,
+# gif:cairo:gd, gif:gd, gif:gd:gd, svg, png:gd, png:gd:gd, png:cairo,
 # png:cairo:gd, png:cairo:cairo, png:cairo:gdiplus, png:gdiplus and
 # png:gdiplus:gdiplus.
 # The default value is: png.
@@ -2476,9 +2640,11 @@ DOT_MULTI_TARGETS      = YES
 
 GENERATE_LEGEND        = YES
 
-# If the DOT_CLEANUP tag is set to YES, doxygen will remove the intermediate dot
+# If the DOT_CLEANUP tag is set to YES, doxygen will remove the intermediate
 # files that are used to generate the various graphs.
+#
+# Note: This setting is not only used for dot files but also for msc and
+# plantuml temporary files.
 # The default value is: YES.
-# This tag requires that the tag HAVE_DOT is set to YES.
 
 DOT_CLEANUP            = YES

MODULE.bazel

@@ -0,0 +1,3 @@
+module(name = "catch2")
+
+bazel_dep(name = "bazel_skylib", version = "1.7.1")

WORKSPACE.bazel

@@ -4,12 +4,13 @@ load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
 http_archive(
     name = "bazel_skylib",
+    sha256 = "bc283cdfcd526a52c3201279cda4bc298652efa898b10b4db0837dc51652756f",
     urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.3.0/bazel-skylib-1.3.0.tar.gz",
-        "https://github.com/bazelbuild/bazel-skylib/releases/download/1.3.0/bazel-skylib-1.3.0.tar.gz",
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.7.1/bazel-skylib-1.7.1.tar.gz",
+        "https://github.com/bazelbuild/bazel-skylib/releases/download/1.7.1/bazel-skylib-1.7.1.tar.gz",
     ],
-    sha256 = "74d544d96f4a5bb630d465ca8bbcfe231e3594e5aae57e1edbf17a6eb3ca2506",
 )
 
 load("@bazel_skylib//:workspace.bzl", "bazel_skylib_workspace")
+
 bazel_skylib_workspace()

appveyor.yml

@@ -5,10 +5,10 @@ version: "{build}-{branch}"
 clone_depth: 20
 
 # We want to build everything, except for branches that are explicitly
-# for messing around with travis.
+# for messing around with Github Actions.
 branches:
   except:
-    - /dev-travis.+/
+    - /devel-gha.+/
 
 
 # We need a more up to date pip because Python 2.7 is EOL soon
@@ -80,4 +80,4 @@ environment:
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
       coverage: 1
       platform: x64
-      configuration: Debug
+      configuration: Debug

conanfile.py

@@ -1,5 +1,14 @@
 #!/usr/bin/env python
-from conans import ConanFile, CMake, tools
+from conan import ConanFile
+from conan.tools.cmake import CMake, CMakeToolchain, CMakeDeps, cmake_layout
+from conan.tools.files import copy, rmdir
+from conan.tools.build import check_min_cppstd
+from conan.tools.scm import Version
+from conan.errors import ConanInvalidConfiguration
+import os
+import re
+
+required_conan_version = ">=1.53.0"
 
 class CatchConan(ConanFile):
     name = "catch2"
@@ -8,53 +17,113 @@ class CatchConan(ConanFile):
     url = "https://github.com/catchorg/Catch2"
     homepage = url
     license = "BSL-1.0"
-
-    exports = "LICENSE.txt"
-    exports_sources = ("src/*", "CMakeLists.txt", "CMake/*", "extras/*")
-
+    version = "latest"
     settings = "os", "compiler", "build_type", "arch"
+    extension_properties = {"compatibility_cppstd": False}
 
-    generators = "cmake"
+    options = {
+        "shared": [True, False],
+        "fPIC": [True, False],
+    }
+    default_options = {
+        "shared": False,
+        "fPIC": True,
+    }
 
-    def _configure_cmake(self):
-        cmake = CMake(self)
-        cmake.definitions["BUILD_TESTING"] = "OFF"
-        cmake.definitions["CATCH_INSTALL_DOCS"] = "OFF"
-        cmake.definitions["CATCH_INSTALL_EXTRAS"] = "ON"
-        cmake.configure(build_folder="build")
-        return cmake
+    @property
+    def _min_cppstd(self):
+        return "14"
+
+    @property
+    def _compilers_minimum_version(self):
+        return {
+            "gcc": "7",
+            "Visual Studio": "15",
+            "msvc": "191",
+            "clang": "5",
+            "apple-clang": "10",
+        }
+
+
+    def set_version(self):
+        pattern = re.compile(r"\w*VERSION (\d+\.\d+\.\d+) # CML version placeholder, don't delete")
+        with open("CMakeLists.txt") as file:
+            for line in file:
+                result = pattern.search(line)
+                if result:
+                    self.version = result.group(1)
+
+        self.output.info(f'Using version: {self.version}')
+
+    def export(self):
+        copy(self, "LICENSE.txt", src=self.recipe_folder, dst=self.export_folder)
+
+    def export_sources(self):
+        copy(self, "CMakeLists.txt", src=self.recipe_folder, dst=self.export_sources_folder)
+        copy(self, "src/*", src=self.recipe_folder, dst=self.export_sources_folder)
+        copy(self, "extras/*", src=self.recipe_folder, dst=self.export_sources_folder)
+        copy(self, "CMake/*", src=self.recipe_folder, dst=self.export_sources_folder)
+
+    def config_options(self):
+        if self.settings.os == "Windows":
+            del self.options.fPIC
+
+    def configure(self):
+        if self.options.shared:
+            self.options.rm_safe("fPIC")
+
+    def layout(self):
+        cmake_layout(self)
+
+    def validate(self):
+        if self.settings.compiler.get_safe("cppstd"):
+            check_min_cppstd(self, self._min_cppstd)
+        # INFO: Conan 1.x does not specify cppstd by default, so we need to check the compiler version instead.
+        minimum_version = self._compilers_minimum_version.get(str(self.settings.compiler), False)
+        if minimum_version and Version(self.settings.compiler.version) < minimum_version:
+            raise ConanInvalidConfiguration(f"{self.ref} requires C++{self._min_cppstd}, which your compiler doesn't support")
+
+    def generate(self):
+        tc = CMakeToolchain(self)
+        tc.cache_variables["BUILD_TESTING"] = False
+        tc.cache_variables["CATCH_INSTALL_DOCS"] = False
+        tc.cache_variables["CATCH_INSTALL_EXTRAS"] = True
+        tc.generate()
+
+        deps = CMakeDeps(self)
+        deps.generate()
 
     def build(self):
-        # We need this workaround until the toolchains feature
-        # to inject stuff like MD/MT
-        line_to_replace = 'list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/CMake")'
-        tools.replace_in_file("CMakeLists.txt", line_to_replace,
-                              '''{}
-include("{}/conanbuildinfo.cmake")
-conan_basic_setup()'''.format(line_to_replace, self.install_folder.replace("\\", "/")))
-
-        cmake = self._configure_cmake()
+        cmake = CMake(self)
+        cmake.configure()
         cmake.build()
 
     def package(self):
-        self.copy(pattern="LICENSE.txt", dst="licenses")
-        cmake = self._configure_cmake()
+        copy(self, "LICENSE.txt", src=str(self.recipe_folder), dst=os.path.join(self.package_folder, "licenses"))
+        cmake = CMake(self)
         cmake.install()
+        rmdir(self, os.path.join(self.package_folder, "share"))
+        rmdir(self, os.path.join(self.package_folder, "lib", "cmake"))
+        copy(self, "*.cmake", src=os.path.join(self.export_sources_folder, "extras"),
+                              dst=os.path.join(self.package_folder, "lib", "cmake", "Catch2"))
 
     def package_info(self):
         lib_suffix = "d" if self.settings.build_type == "Debug" else ""
 
-        self.cpp_info.names["cmake_find_package"] = "Catch2"
-        self.cpp_info.names["cmake_find_package_multi"] = "Catch2"
+        self.cpp_info.set_property("cmake_file_name", "Catch2")
+        self.cpp_info.set_property("cmake_target_name", "Catch2::Catch2WithMain")
+        self.cpp_info.set_property("pkg_config_name", "catch2-with-main")
+
         # Catch2
-        self.cpp_info.components["catch2base"].names["cmake_find_package"] = "Catch2"
-        self.cpp_info.components["catch2base"].names["cmake_find_package_multi"] = "Catch2"
-        self.cpp_info.components["catch2base"].names["pkg_config"] = "Catch2"
+        self.cpp_info.components["catch2base"].set_property("cmake_file_name", "Catch2::Catch2")
+        self.cpp_info.components["catch2base"].set_property("cmake_target_name", "Catch2::Catch2")
+        self.cpp_info.components["catch2base"].set_property("pkg_config_name", "catch2")
         self.cpp_info.components["catch2base"].libs = ["Catch2" + lib_suffix]
         self.cpp_info.components["catch2base"].builddirs.append("lib/cmake/Catch2")
+
         # Catch2WithMain
-        self.cpp_info.components["catch2main"].names["cmake_find_package"] = "Catch2WithMain"
-        self.cpp_info.components["catch2main"].names["cmake_find_package_multi"] = "Catch2WithMain"
-        self.cpp_info.components["catch2main"].names["pkg_config"] = "Catch2WithMain"
+        self.cpp_info.components["catch2main"].set_property("cmake_file_name", "Catch2::Catch2WithMain")
+        self.cpp_info.components["catch2main"].set_property("cmake_target_name", "Catch2::Catch2WithMain")
+        self.cpp_info.components["catch2main"].set_property("pkg_config_name", "catch2-with-main")
         self.cpp_info.components["catch2main"].libs = ["Catch2Main" + lib_suffix]
         self.cpp_info.components["catch2main"].requires = ["catch2base"]

docs/assertions.md

@@ -110,7 +110,7 @@ Expects that an exception is thrown that, when converted to a string, matches th
 
 e.g.
 ```cpp
-REQUIRE_THROWS_WITH( openThePodBayDoors(), Contains( "afraid" ) && Contains( "can't do that" ) );
+REQUIRE_THROWS_WITH( openThePodBayDoors(), ContainsSubstring( "afraid" ) && ContainsSubstring( "can't do that" ) );
 REQUIRE_THROWS_WITH( dismantleHal(), "My mind is going" );
 ```
 

docs/benchmarks.md

@@ -93,7 +93,7 @@ Fibonacci
 -------------------------------------------------------------------------------
 C:\path\to\Catch2\Benchmark.tests.cpp(10)
 ...............................................................................
-benchmark name                                  samples       iterations    estimated
+benchmark name                                  samples       iterations    est run time
                                                 mean          low mean      high mean
                                                 std dev       low std dev   high std dev
 -------------------------------------------------------------------------------

docs/ci-and-misc.md

@@ -82,7 +82,7 @@ variable set to "1".
 
 ### CodeCoverage module (GCOV, LCOV...)
 
-If you are using GCOV tool to get testing coverage of your code, and are not sure how to integrate it with CMake and Catch, there should be an external example over at https://github.com/fkromer/catch_cmake_coverage
+If you are using GCOV tool to get testing coverage of your code, and are not sure how to integrate it with CMake and Catch, there should be an external example over at https://github.com/claremacrae/catch_cmake_coverage
 
 
 ### pkg-config

docs/cmake-integration.md

@@ -8,6 +8,7 @@
 [`CATCH_CONFIG_*` customization options in CMake](#catch_config_-customization-options-in-cmake)<br>
 [Installing Catch2 from git repository](#installing-catch2-from-git-repository)<br>
 [Installing Catch2 from vcpkg](#installing-catch2-from-vcpkg)<br>
+[Installing Catch2 from Bazel](#installing-catch2-from-bazel)<br>
 
 Because we use CMake to build Catch2, we also provide a couple of
 integration points for our users.
@@ -51,7 +52,7 @@ Include(FetchContent)
 FetchContent_Declare(
   Catch2
   GIT_REPOSITORY https://github.com/catchorg/Catch2.git
-  GIT_TAG        v3.0.1 # or a later release
+  GIT_TAG        v3.4.0 # or a later release
 )
 
 FetchContent_MakeAvailable(Catch2)
@@ -126,6 +127,7 @@ catch_discover_tests(target
                      [OUTPUT_DIR dir]
                      [OUTPUT_PREFIX prefix]
                      [OUTPUT_SUFFIX suffix]
+                     [DISCOVERY_MODE <POST_BUILD|PRE_TEST>]
 )
 ```
 
@@ -198,6 +200,16 @@ If specified, `suffix` is added to each output file name, like so
 `--out dir/<test_name>suffix`. This can be used to add a file extension to
 the output file name e.g. ".xml".
 
+* `DISCOVERY_MODE mode`
+
+If specified allows control over when test discovery is performed.
+For a value of `POST_BUILD` (default) test discovery is performed at build time.
+For a value of `PRE_TEST` test discovery is delayed until just prior to test
+execution (useful e.g. in cross-compilation environments).
+``DISCOVERY_MODE`` defaults to the value of the
+``CMAKE_CATCH_DISCOVER_TESTS_DISCOVERY_MODE`` variable if it is not passed when
+calling ``catch_discover_tests``. This provides a mechanism for globally
+selecting a preferred test discovery behavior.
 
 ### `ParseAndAddCatchTests.cmake`
 
@@ -373,7 +385,7 @@ install it to the default location, like so:
 ```
 $ git clone https://github.com/catchorg/Catch2.git
 $ cd Catch2
-$ cmake -Bbuild -H. -DBUILD_TESTING=OFF
+$ cmake -B build -S . -DBUILD_TESTING=OFF
 $ sudo cmake --build build/ --target install
 ```
 
@@ -397,6 +409,24 @@ cd vcpkg
 The catch2 port in vcpkg is kept up to date by microsoft team members and community contributors.
 If the version is out of date, please [create an issue or pull request](https://github.com/Microsoft/vcpkg) on the vcpkg repository.
 
+## Installing Catch2 from Bazel
+
+Catch2 is now a supported module in the Bazel Central Registry. You only need to add one line to your MODULE.bazel file;
+please see https://registry.bazel.build/modules/catch2 for the latest supported version.
+
+You can then add `catch2_main` to each of your C++ test build rules as follows:
+
+```
+cc_test(
+    name = "example_test",
+    srcs = ["example_test.cpp"],
+    deps = [
+        ":example",
+        "@catch2//:catch2_main",
+    ],
+)
+```
+
 ---
 
 [Home](Readme.md#top)

docs/command-line.md

@@ -85,43 +85,102 @@ Click one of the following links to take you straight to that option - or scroll
 
 <pre>&lt;test-spec> ...</pre>
 
-Test cases, wildcarded test cases, tags and tag expressions are all passed directly as arguments. Tags are distinguished by being enclosed in square brackets.
+By providing a test spec, you filter which tests will be run. If you call
+Catch2 without any test spec, then it will run all non-hidden test
+cases. A test case is hidden if it has the `[!benchmark]` tag, any tag
+with a dot at the start, e.g. `[.]` or `[.foo]`.
 
-If no test specs are supplied then all test cases, except "hidden" tests, are run.
-A test is hidden by giving it any tag starting with (or just) a period (```.```) - or, in the deprecated case, tagged ```[hide]``` or given name starting with `'./'`. To specify hidden tests from the command line ```[.]``` or ```[hide]``` can be used *regardless of how they were declared*.
+There are three basic test specs that can then be combined into more
+complex specs:
 
-Specs must be enclosed in quotes if they contain spaces. If they do not contain spaces the quotes are optional.
+  * Full test name, e.g. `"Test 1"`.
 
-Wildcards consist of the `*` character at the beginning and/or end of test case names and can substitute for any number of any characters (including none).
+    This allows only test cases whose name is "Test 1".
 
-Test specs are case insensitive.
+  * Wildcarded test name, e.g. `"*Test"`, or `"Test*"`, or `"*Test*"`.
 
-If a spec is prefixed with `exclude:` or the `~` character then the pattern matches an exclusion. This means that tests matching the pattern are excluded from the set - even if a prior inclusion spec included them. Subsequent inclusion specs will take precedence, however.
-Inclusions and exclusions are evaluated in left-to-right order.
+    This allows any test case whose name ends with, starts with, or contains
+    in the middle the string "Test". Note that the wildcard can only be at
+    the start or end.
 
-Test case examples:
+  * Tag name, e.g. `[some-tag]`.
 
+    This allows any test case tagged with "[some-tag]". Remember that some
+    tags are special, e.g. those that start with "." or with "!".
+
+
+You can also combine the basic test specs to create more complex test
+specs. You can:
+
+  * Concatenate specs to apply all of them, e.g. `[some-tag][other-tag]`.
+
+    This allows test cases that are tagged with **both** "[some-tag]" **and**
+    "[other-tag]". A test case with just "[some-tag]" will not pass the filter,
+    nor will test case with just "[other-tag]".
+
+  * Comma-join specs to apply any of them, e.g. `[some-tag],[other-tag]`.
+
+    This allows test cases that are tagged with **either** "[some-tag]" **or**
+    "[other-tag]". A test case with both will obviously also pass the filter.
+
+    Note that commas take precendence over simple concatenation. This means
+    that `[a][b],[c]` accepts tests that are tagged with either both "[a]" and
+    "[b]", or tests that are tagged with just "[c]".
+
+  * Negate the spec by prepending it with `~`, e.g. `~[some-tag]`.
+
+    This rejects any test case that is tagged with "[some-tag]". Note that
+    rejection takes precedence over other filters.
+
+    Note that negations always binds to the following _basic_ test spec.
+    This means that `~[foo][bar]` negates only the "[foo]" tag and not the
+    "[bar]" tag.
+
+Note that when Catch2 is deciding whether to include a test, first it
+checks whether the test matches any negative filters. If it does,
+the test is rejected. After that, the behaviour depends on whether there
+are positive filters as well. If there are no positive filters, all
+remaining non-hidden tests are included. If there are positive filters,
+only tests that match the positive filters are included.
+
+You can also match test names with special characters by escaping them
+with a backslash (`"\"`), e.g. a test named `"Do A, then B"` is matched
+by `"Do A\, then B"` test spec. Backslash also escapes itself.
+
+
+### Examples
+
+Given these TEST_CASEs,
 ```
-thisTestOnly            Matches the test case called, 'thisTestOnly'
-"this test only"        Matches the test case called, 'this test only'
-these*                  Matches all cases starting with 'these'
-exclude:notThis         Matches all tests except, 'notThis'
-~notThis                Matches all tests except, 'notThis'
-~*private*              Matches all tests except those that contain 'private'
-a* ~ab* abc             Matches all tests that start with 'a', except those that
-                        start with 'ab', except 'abc', which is included
-~[tag1]                 Matches all tests except those tagged with '[tag1]'
--# [#somefile]          Matches all tests from the file 'somefile.cpp'
+TEST_CASE("Test 1") {}
+
+TEST_CASE("Test 2", "[.foo]") {}
+
+TEST_CASE("Test 3", "[.bar]") {}
+
+TEST_CASE("Test 4", "[.][foo][bar]") {}
 ```
 
-Names within square brackets are interpreted as tags.
-A series of tags form an AND expression whereas a comma-separated sequence forms an OR expression. e.g.:
+this is the result of these filters
+```
+./tests                      # Selects only the first test, others are hidden
+./tests "Test 1"             # Selects only the first test, other do not match
+./tests ~"Test 1"            # Selects no tests. Test 1 is rejected, other tests are hidden
+./tests "Test *"             # Selects all tests.
+./tests [bar]                # Selects tests 3 and 4. Other tests are not tagged [bar]
+./tests ~[foo]               # Selects test 1, because it is the only non-hidden test without [foo] tag
+./tests [foo][bar]           # Selects test 4.
+./tests [foo],[bar]          # Selects tests 2, 3, 4.
+./tests ~[foo][bar]          # Selects test 3. 2 and 4 are rejected due to having [foo] tag
+./tests ~"Test 2"[foo]       # Selects test 4, because test 2 is explicitly rejected
+./tests [foo][bar],"Test 1"  # Selects tests 1 and 4.
+./tests "Test 1*"            # Selects test 1, wildcard can match zero characters
+```
 
-<pre>[one][two],[three]</pre>
-This matches all tests tagged `[one]` and `[two]`, as well as all tests tagged `[three]`
+_Note: Using plain asterisk on a command line can cause issues with shell
+expansion. Make sure that the asterisk is passed to Catch2 and is not
+interpreted by the shell._
 
-Test names containing special characters, such as `,` or `[` can specify them on the command line using `\`.
-`\` also escapes itself.
 
 <a id="choosing-a-reporter-to-use"></a>
 ## Choosing a reporter to use
@@ -135,7 +194,8 @@ verbose and human-friendly output.
 
 Reporters are also individually configurable. To pass configuration options
 to the reporter, you append `::key=value` to the reporter specification
-as many times as you want, e.g. `--reporter xml::out=someFile.xml`.
+as many times as you want, e.g. `--reporter xml::out=someFile.xml` or
+`--reporter custom::colour-mode=ansi::Xoption=2`.
 
 The keys must either be prefixed by "X", in which case they are not parsed
 by Catch2 and are only passed down to the reporter, or one of options
@@ -306,14 +366,14 @@ There are currently two warnings implemented:
 ## Reporting timings
 <pre>-d, --durations &lt;yes/no></pre>
 
-When set to ```yes``` Catch will report the duration of each test case, in milliseconds. Note that it does this regardless of whether a test case passes or fails. Note, also, the certain reporters (e.g. Junit) always report test case durations regardless of this option being set or not.
+When set to ```yes``` Catch will report the duration of each test case, in seconds with millisecond precision. Note that it does this regardless of whether a test case passes or fails. Note, also, the certain reporters (e.g. Junit) always report test case durations regardless of this option being set or not.
 
 <pre>-D, --min-duration &lt;value></pre>
 
 > `--min-duration` was [introduced](https://github.com/catchorg/Catch2/pull/1910) in Catch2 2.13.0
 
 When set, Catch will report the duration of each test case that took more
-than &lt;value> seconds, in milliseconds. This option is overridden by both
+than &lt;value> seconds, in seconds with millisecond precision. This option is overridden by both
 `-d yes` and `-d no`, so that either all durations are reported, or none
 are.
 

docs/configuration.md

@@ -15,6 +15,7 @@
 [Enabling stringification](#enabling-stringification)<br>
 [Disabling exceptions](#disabling-exceptions)<br>
 [Overriding Catch's debug break (`-b`)](#overriding-catchs-debug-break--b)<br>
+[Static analysis support](#static-analysis-support)<br>
 
 Catch2 is designed to "just work" as much as possible, and most of the
 configuration options below are changed automatically during compilation,
@@ -25,7 +26,8 @@ with the same name.
 
 ## Prefixing Catch macros
 
-    CATCH_CONFIG_PREFIX_ALL
+    CATCH_CONFIG_PREFIX_ALL       // Prefix all macros with CATCH_
+    CATCH_CONFIG_PREFIX_MESSAGES  // Prefix only INFO, UNSCOPED_INFO, WARN and CAPTURE
 
 To keep test code clean and uncluttered Catch uses short macro names (e.g. ```TEST_CASE``` and ```REQUIRE```). Occasionally these may conflict with identifiers from platform headers or the system under test. In this case the above identifier can be defined. This will cause all the Catch user macros to be prefixed with ```CATCH_``` (e.g. ```CATCH_TEST_CASE``` and ```CATCH_REQUIRE```).
 
@@ -264,6 +266,31 @@ The macro will be used as is, that is, `CATCH_BREAK_INTO_DEBUGGER();`
 must compile and must break into debugger.
 
 
+## Static analysis support
+
+> Introduced in Catch2 3.4.0.
+
+Some parts of Catch2, e.g. `SECTION`s, can be hard for static analysis
+tools to reason about. Catch2 can change its internals to help static
+analysis tools reason about the tests.
+
+Catch2 automatically detects some static analysis tools (initial
+implementation checks for clang-tidy and Coverity), but you can override
+its detection (in either direction) via
+
+```
+CATCH_CONFIG_EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT     // force enables static analysis help
+CATCH_CONFIG_NO_EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT  // force disables static analysis help
+```
+
+_As the name suggests, this is currently experimental, and thus we provide
+no backwards compatibility guarantees._
+
+**DO NOT ENABLE THIS FOR BUILDS YOU INTEND TO RUN.** The changed internals
+are not meant to be runnable, only "scannable".
+
+
+
 ---
 
 [Home](Readme.md#top)

docs/deprecations.md

@@ -35,6 +35,19 @@ being aborted (when using `--abort` or `--abortx`). It is however
 **NOT** invoked for test cases that are [explicitly skipped using the `SKIP`
 macro](skipping-passing-failing.md#top).
 
+
+### Non-const function for `TEST_CASE_METHOD`
+
+> Deprecated in Catch2 vX.Y.Z
+
+Currently, the member function generated for `TEST_CASE_METHOD` is
+not `const` qualified. In the future, the generated member function will
+be `const` qualified, just as `TEST_CASE_PERSISTENT_FIXTURE` does.
+
+If you are mutating the fixture instance from within the test case, and
+want to keep doing so in the future, mark the mutated members as `mutable`.
+
+
 ---
 
 [Home](Readme.md#top)

docs/faq.md

@@ -10,6 +10,7 @@
 [Does Catch2 support running tests in parallel?](#does-catch2-support-running-tests-in-parallel)<br>
 [Can I compile Catch2 into a dynamic library?](#can-i-compile-catch2-into-a-dynamic-library)<br>
 [What repeatability guarantees does Catch2 provide?](#what-repeatability-guarantees-does-catch2-provide)<br>
+[My build cannot find `catch2/catch_user_config.hpp`, how can I fix it?](#my-build-cannot-find-catch2catch_user_confighpp-how-can-i-fix-it)<br>
 
 
 ## How do I run global setup/teardown only if tests will be run?
@@ -28,7 +29,7 @@ depending on how often the cleanup needs to happen.
 ## Why cannot I derive from the built-in reporters?
 
 They are not made to be overridden, in that we do not attempt to maintain
-a consistent internal state if a member function is overriden, and by
+a consistent internal state if a member function is overridden, and by
 forbidding users from using them as a base class, we can refactor them
 as needed later.
 
@@ -83,12 +84,30 @@ and it is also generally repeatable across versions, but we might break
 it from time to time. E.g. we broke repeatability with previous versions
 in v2.13.4 so that test cases with similar names are shuffled better.
 
-Random generators currently rely on platform's stdlib, specifically
-the distributions from `<random>`. We thus provide no extra guarantee
-above what your platform does. **Important: `<random>`'s distributions
+Since Catch2 3.5.0 the random generators use custom distributions,
+that should be repeatable across different platforms, with few caveats.
+For details see the section on random generators in the [Generator
+documentation](generators.md#random-number-generators-details).
+
+Before this version, random generators relied on distributions from
+platform's stdlib. We thus can provide no extra guarantee on top of the
+ones given by your platform. **Important: `<random>`'s distributions
 are not specified to be repeatable across different platforms.**
 
 
+## My build cannot find `catch2/catch_user_config.hpp`, how can I fix it?
+
+`catch2/catch_user_config.hpp` is a generated header that contains user
+compile time configuration. It is generated by CMake/Meson/Bazel during
+build. If you are not using either of these, your three options are to
+
+1) Build Catch2 separately using build tool that will generate the header
+2) Use the amalgamated files to build Catch2
+3) Use CMake to configure a build. This will generate the header and you
+   can copy it into your own checkout of Catch2.
+
+
+
 ---
 
 [Home](Readme.md#top)

docs/generators.md

@@ -134,7 +134,7 @@ type, making their usage much nicer. These are
 * `map<T>(func, GeneratorWrapper<U>&&)` for `MapGenerator<T, U, Func>` (map `U` to `T`)
 * `chunk(chunk-size, GeneratorWrapper<T>&&)` for `ChunkGenerator<T>`
 * `random(IntegerOrFloat a, IntegerOrFloat b)` for `RandomIntegerGenerator` or `RandomFloatGenerator`
-* `range(Arithemtic start, Arithmetic end)` for `RangeGenerator<Arithmetic>` with a step size of `1`
+* `range(Arithmetic start, Arithmetic end)` for `RangeGenerator<Arithmetic>` with a step size of `1`
 * `range(Arithmetic start, Arithmetic end, Arithmetic step)` for `RangeGenerator<Arithmetic>` with a custom step size
 * `from_range(InputIterator from, InputIterator to)` for `IteratorGenerator<T>`
 * `from_range(Container const&)` for `IteratorGenerator<T>`
@@ -189,6 +189,45 @@ TEST_CASE("type conversion", "[generators]") {
 }
 ```
 
+
+### Random number generators: details
+
+> This section applies from Catch2 3.5.0. Before that, random generators
+> were a thin wrapper around distributions from `<random>`.
+
+All of the `random(a, b)` generators in Catch2 currently generate uniformly
+distributed number in closed interval \[a; b\]. This  is different from
+`std::uniform_real_distribution`, which should return numbers in interval
+\[a; b) (but due to rounding can end up returning b anyway), but the
+difference is intentional, so that `random(a, a)` makes sense. If there is
+enough interest from users, we can provide API to pick any of CC, CO, OC,
+or OO ranges.
+
+Unlike `std::uniform_int_distribution`, Catch2's generators also support
+various single-byte integral types, such as `char` or `bool`.
+
+
+#### Reproducibility
+
+Given the same seed, the output from the integral generators is fully
+reproducible across different platforms.
+
+For floating point generators, the situation is much more complex.
+Generally Catch2 only promises reproducibility (or even just correctness!)
+on platforms that obey the IEEE-754 standard. Furthermore, reproducibility
+only applies between binaries that perform floating point math in the
+same way, e.g. if you compile a binary targetting the x87 FPU and another
+one targetting SSE2 for floating point math, their results will vary.
+Similarly, binaries compiled with compiler flags that relax the IEEE-754
+adherence, e.g. `-ffast-math`, might provide different results than those
+compiled for strict IEEE-754 adherence.
+
+Finally, we provide zero guarantees on the reproducibility of generating
+`long double`s, as the internals of `long double` varies across different
+platforms.
+
+
+
 ## Generator interface
 
 You can also implement your own generators, by deriving from the
@@ -221,3 +260,21 @@ For full example of implementing your own generator, look into Catch2's
 examples, specifically
 [Generators: Create your own generator](../examples/300-Gen-OwnGenerator.cpp).
 
+
+### Handling empty generators
+
+The generator interface assumes that a generator always has at least one
+element. This is not always true, e.g. if the generator depends on an external
+datafile, the file might be missing.
+
+There are two ways to handle this, depending on whether you want this
+to be an error or not.
+
+ * If empty generator **is** an error, throw an exception in constructor.
+ * If empty generator **is not** an error, use the [`SKIP`](skipping-passing-failing.md#skipping-test-cases-at-runtime) in constructor.
+
+
+
+---
+
+[Home](Readme.md#top)

docs/limitations.md

@@ -174,12 +174,18 @@ TEST_CASE("b") {
 If you are seeing a problem like this, i.e. weird test paths that trigger only under Clang with `libc++`, or only under very specific version of `libstdc++`, it is very likely you are seeing this. The only known workaround is to use a fixed version of your standard library.
 
 
-### libstdc++, `_GLIBCXX_DEBUG` macro and random ordering of tests
+### Visual Studio 2022 -- can't compile assertion with the spaceship operator
 
-Running a Catch2 binary compiled against libstdc++ with `_GLIBCXX_DEBUG`
-macro defined with `--order rand` will cause a debug check to trigger and
-abort the run due to self-assignment.
-[This is a known bug inside libstdc++](https://stackoverflow.com/questions/22915325/avoiding-self-assignment-in-stdshuffle/23691322)
+[The C++ standard requires that `std::foo_ordering` is only comparable with
+a literal 0](https://eel.is/c++draft/cmp#categories.pre-3). There are
+multiple strategies a stdlib implementation can take to achieve this, and
+MSVC's STL has changed the strategy they use between two releases of VS 2022.
+
+With the new strategy, `REQUIRE((a <=> b) == 0)` no longer compiles under
+MSVC. Note that Catch2 can compile code using MSVC STL's new strategy,
+but only when compiled with a C++20 conforming compiler. MSVC is currently
+not conformant enough, but `clang-cl` will compile the assertion above
+using MSVC STL without problem.
+
+This change got in with MSVC v19.37](https://godbolt.org/z/KG9obzdvE).
 
-Workaround: Don't use `--order rand` when compiling against debug-enabled
-libstdc++.

docs/list-of-examples.md

@@ -8,6 +8,7 @@
 - Assertion: [REQUIRE, CHECK](../examples/030-Asn-Require-Check.cpp)
 - Fixture: [Sections](../examples/100-Fix-Section.cpp)
 - Fixture: [Class-based fixtures](../examples/110-Fix-ClassFixture.cpp)
+- Fixture: [Persistent fixtures](../examples/111-Fix-PersistentFixture.cpp)
 - BDD: [SCENARIO, GIVEN, WHEN, THEN](../examples/120-Bdd-ScenarioGivenWhenThen.cpp)
 - Listener: [Listeners](../examples/210-Evt-EventListeners.cpp)
 - Configuration: [Provide your own output streams](../examples/231-Cfg-OutputStreams.cpp)

docs/logging.md

@@ -114,6 +114,10 @@ Similar to `INFO`, but messages are not limited to their own scope: They are rem
 
 The message is always reported but does not fail the test.
 
+**SUCCEED(** _message expression_ **)**
+
+The message is reported and the test case succeeds.
+
 **FAIL(** _message expression_ **)**
 
 The message is reported and the test case fails.

docs/matchers.md

@@ -50,25 +50,43 @@ Both of the string matchers used in the examples above live in the
 `catch_matchers_string.hpp` header, so to compile the code above also
 requires `#include <catch2/matchers/catch_matchers_string.hpp>`.
 
+### Combining operators and lifetimes
+
 **IMPORTANT**: The combining operators do not take ownership of the
-matcher objects being combined. This means that if you store combined
-matcher object, you have to ensure that the matchers being combined
-outlive its last use. What this means is that the following code leads
-to a use-after-free (UAF):
+matcher objects being combined.
 
+This means that if you store combined matcher object, you have to ensure
+that the individual matchers being combined outlive the combined matcher.
+Note that the negation matcher from `!` also counts as combining matcher
+for this.
+
+Explained on an example, this is fine
 ```cpp
-#include <catch2/catch_test_macros.hpp>
-#include <catch2/matchers/catch_matchers_string.hpp>
-
-TEST_CASE("Bugs, bugs, bugs", "[Bug]"){
-    std::string str = "Bugs as a service";
-
-    auto match_expression = Catch::Matchers::EndsWith( "as a service" ) ||
-        (Catch::Matchers::StartsWith( "Big data" ) && !Catch::Matchers::ContainsSubstring( "web scale" ) );
-    REQUIRE_THAT(str, match_expression);
-}
+CHECK_THAT(value, WithinAbs(0, 2e-2) && !WithinULP(0., 1));
 ```
 
+and so is this
+```cpp
+auto is_close_to_zero = WithinAbs(0, 2e-2);
+auto is_zero          = WithinULP(0., 1);
+
+CHECK_THAT(value, is_close_to_zero && !is_zero);
+```
+
+but this is not
+```cpp
+auto is_close_to_zero = WithinAbs(0, 2e-2);
+auto is_zero          = WithinULP(0., 1);
+auto is_close_to_but_not_zero = is_close_to_zero && !is_zero;
+
+CHECK_THAT(a_value, is_close_to_but_not_zero); // UAF
+```
+
+because `!is_zero` creates a temporary instance of Negation matcher,
+which the `is_close_to_but_not_zero` refers to. After the line ends,
+the temporary is destroyed and the combined `is_close_to_but_not_zero`
+matcher now refers to non-existent object, so using it causes use-after-free.
+
 
 ## Built-in matchers
 
@@ -192,15 +210,36 @@ The other miscellaneous matcher utility is exception matching.
 
 #### Matching exceptions
 
-Catch2 provides a utility macro for asserting that an expression
-throws exception of specific type, and that the exception has desired
-properties. The macro is `REQUIRE_THROWS_MATCHES(expr, ExceptionType, Matcher)`.
+Because exceptions are a bit special, Catch2 has a separate macro for them.
+
+
+The basic form is
+
+```
+REQUIRE_THROWS_MATCHES(expr, ExceptionType, Matcher)
+```
+
+and it checks that the `expr` throws an exception, that exception is derived
+from the `ExceptionType` type, and then `Matcher::match` is called on
+the caught exception.
 
 > `REQUIRE_THROWS_MATCHES` macro lives in `catch2/matchers/catch_matchers.hpp`
 
+For one-off checks you can use the `Predicate` matcher above, e.g.
 
-Catch2 currently provides two matchers for exceptions.
-These are:
+```cpp
+REQUIRE_THROWS_MATCHES(parse(...),
+                       parse_error,
+                       Predicate<parse_error>([] (parse_error const& err) -> bool { return err.line() == 1; })
+);
+```
+
+but if you intend to thoroughly test your error reporting, I recommend
+defining a specialized matcher.
+
+
+Catch2 also provides 2 built-in matchers for checking the error message
+inside an exception (it must be derived from `std::exception`):
 * `Message(std::string message)`.
 * `MessageMatches(Matcher matcher)`.
 
@@ -218,10 +257,7 @@ REQUIRE_THROWS_MATCHES(throwsDerivedException(),  DerivedException,  Message("De
 REQUIRE_THROWS_MATCHES(throwsDerivedException(),  DerivedException,  MessageMatches(StartsWith("DerivedException")));
 ```
 
-Note that `DerivedException` in the example above has to derive from
-`std::exception` for the example to work.
-
-> the exception message matcher lives in `catch2/matchers/catch_matchers_exception.hpp`
+> the exception message matchers live in `catch2/matchers/catch_matchers_exception.hpp`
 
 
 ### Generic range Matchers
@@ -286,7 +322,7 @@ comparable. (e.g. you may compare `std::vector<int>` to `std::array<char>`).
 `UnorderedRangeEquals` is similar to `RangeEquals`, but the order
 does not matter. For example "1, 2, 3" would match "3, 2, 1", but not
 "1, 1, 2, 3" As with `RangeEquals`, `UnorderedRangeEquals` compares
-the individual elements using using `operator==` by default.
+the individual elements using `operator==` by default.
 
 Both `RangeEquals` and `UnorderedRangeEquals` optionally accept a
 predicate which can be used to compare the containers element-wise.

docs/opensource-users.md

@@ -95,6 +95,9 @@ A C++ client library for Consul. Consul is a distributed tool for discovering an
 ### [Reactive-Extensions/ RxCpp](https://github.com/Reactive-Extensions/RxCpp)
 A library of algorithms for values-distributed-in-time.
 
+### [SFML](https://github.com/SFML/SFML)
+Simple and Fast Multimedia Library.
+
 ### [SOCI](https://github.com/SOCI/soci)
 The C++ Database Access Library.
 
@@ -110,6 +113,12 @@ A header-only TOML parser and serializer for modern C++.
 ### [Trompeloeil](https://github.com/rollbear/trompeloeil)
 A thread-safe header-only mocking framework for C++14.
 
+### [wxWidgets](https://www.wxwidgets.org/)
+Cross-Platform C++ GUI Library.
+
+### [xmlwrapp](https://github.com/vslavik/xmlwrapp)
+C++ XML parsing library using libxml2.
+
 ## Applications & Tools
 
 ### [App Mesh](https://github.com/laoshanxi/app-mesh)
@@ -137,7 +146,7 @@ Newsbeuter is an open-source RSS/Atom feed reader for text terminals.
 A 2D, Zombie, RPG game which is being made on our own engine.
 
 ### [raspigcd](https://github.com/pantadeusz/raspigcd)
-Low level CLI app and library for execution of GCODE on Raspberry Pi without any additional microcontrolers (just RPi + Stepsticks).
+Low level CLI app and library for execution of GCODE on Raspberry Pi without any additional microcontrollers (just RPi + Stepsticks).
 
 ### [SpECTRE](https://github.com/sxs-collaboration/spectre)
 SpECTRE is a code for multi-scale, multi-physics problems in astrophysics and gravitational physics.

docs/other-macros.md

@@ -93,30 +93,6 @@ TEST_CASE("STATIC_CHECK showcase", "[traits]") {
 
 ## Test case related macros
 
-* `METHOD_AS_TEST_CASE`
-
-`METHOD_AS_TEST_CASE( member-function-pointer, description )` lets you
-register a member function of a class as a Catch2 test case. The class
-will be separately instantiated for each method registered in this way.
-
-```cpp
-class TestClass {
-    std::string s;
-
-public:
-    TestClass()
-        :s( "hello" )
-    {}
-
-    void testCase() {
-        REQUIRE( s == "hello" );
-    }
-};
-
-
-METHOD_AS_TEST_CASE( TestClass::testCase, "Use class's method as a test case", "[class]" )
-```
-
 * `REGISTER_TEST_CASE`
 
 `REGISTER_TEST_CASE( function, description )` let's you register

docs/release-notes.md

@@ -2,6 +2,14 @@
 
 # Release notes
 **Contents**<br>
+[3.7.0](#370)<br>
+[3.6.0](#360)<br>
+[3.5.4](#354)<br>
+[3.5.3](#353)<br>
+[3.5.2](#352)<br>
+[3.5.1](#351)<br>
+[3.5.0](#350)<br>
+[3.4.0](#340)<br>
 [3.3.2](#332)<br>
 [3.3.1](#331)<br>
 [3.3.0](#330)<br>
@@ -56,6 +64,180 @@
 [Even Older versions](#even-older-versions)<br>
 
 
+## 3.7.0
+
+### improvements
+* Slightly improved compile times of benchmarks
+* Made the resolution estimation in benchmarks slightly more precise
+* Added new test case macro, `TEST_CASE_PERSISTENT_FIXTURE` (#2885, #1602)
+  * Unlike `TEST_CASE_METHOD`, the same underlying instance is used for all partial runs of that test case
+* **MASSIVELY** improved performance of the JUnit reporter when handling successful assertions (#2897)
+  * For 1 test case and 10M assertions, the new reporter runs 3x faster and uses up only 8 MB of memory, while the old one needs 7 GB of memory.
+* Reworked how output redirects works.
+  * Combining a reporter writing to stdout with capturing reporter no longer leads to the capturing reporter seeing all of the other reporter's output.
+  * The file based redirect no longer opens up a new temporary file for each partial test case run, so it will not run out of temporary files when running many tests in single process.
+
+### Miscellaneous
+* Better documentation for matchers on thrown exceptions (`REQUIRE_THROWS_MATCHES`)
+* Improved `catch_discover_tests`'s handling of environment paths (#2878)
+  * It won't reorder paths in `DL_PATHS` or `DYLD_FRAMEWORK_PATHS` args
+  * It won't overwrite the environment paths for test discovery
+
+
+## 3.6.0
+
+### Fixes
+* Fixed Windows ARM64 build by fixing the preprocessor condition guarding use `_umul128` intrinsic.
+* Fixed Windows ARM64EC build by removing intrinsic pragma it does not understand. (#2858)
+  * Why doesn't the x64-emulation build mode understand x64 pragmas? Don't ask me, ask the MSVC guys.
+* Fixed the JUnit reporter sometimes crashing when reporting a fatal error. (#1210, #2855)
+  * The binary will still exit, but through the original error, rather than secondary error inside the reporter.
+  * The underlying fix applies to all reporters, not just the JUnit one, but only JUnit was currently causing troubles.
+
+### Improvements
+* Disable `-Wnon-virtual-dtor` in Decomposer and Matchers (#2854)
+* `precision` in floating point stringmakers defaults to `max_digits10`.
+  * This means that floating point values will be printed with enough precision to disambiguate any two floats.
+* Column wrapping ignores ansi colour codes when calculating string width (#2833, #2849)
+  * This makes the output much more readable when the provided messages contain colour codes.
+
+### Miscellaneous
+* Conan support improvements
+  * `compatibility_cppstr` is set to False. (#2860)
+    * This means that Conan won't let you mix library and project with different C++ standard settings.
+  * The implementation library CMake target name through Conan is properly set to `Catch2::Catch2` (#2861)
+* `SelfTest` target can be built through Bazel (#2857)
+
+
+## 3.5.4
+
+### Fixes
+* Fixed potential compilation error when asked to generate random integers whose type did not match `std::(u)int*_t`.
+  * This manifested itself when generating random `size_t`s on MacOS
+* Added missing outlined destructor causing `Wdelete-incomplete` when compiling against libstdc++ in C++23 mode (#2852)
+* Fixed regression where decomposing assertion with const instance of `std::foo_ordering` would not compile
+
+### Improvements
+* Reintroduced support for GCC 5 and 6 (#2836)
+  * As with VS2017, if they start causing trouble again, they will be dropped again.
+* Added workaround for targetting newest MacOS (Sonoma) using GCC (#2837, #2839)
+* `CATCH_CONFIG_DEFAULT_REPORTER` can now be an arbitrary reporter spec
+  * Previously it could only be a plain reporter name, so it was impossible to compile in custom arguments to the reporter.
+* Improved performance of generating 64bit random integers by 20+%
+
+### Miscellaneous
+* Significantly improved Conan in-tree recipe (#2831)
+* `DL_PATHS` in `catch_discover_tests` now supports multiple arguments (#2852, #2736)
+* Fixed preprocessor logic for checking whether we expect reproducible floating point results in tests.
+* Improved the floating point tests structure to avoid `Wunused` when the reproducibility tests are disabled (#2845)
+
+
+## 3.5.3
+
+### Fixes
+* Fixed OOB access when computing filename tag (from the `-#` flag) for file without extension (#2798)
+* Fixed the linking against `log` on Android to be `PRIVATE` (#2815)
+* Fixed `Wuseless-cast` in benchmarking internals (#2823)
+
+### Improvements
+* Restored compatibility with VS2017 (#2792, #2822)
+  * The baseline for Catch2 is still C++14 with some reasonable workarounds for specific compilers, so if VS2017 starts acting up again, the support will be dropped again.
+* Suppressed clang-tidy's `bugprone-chained-comparison` in assertions (#2801)
+* Improved the static analysis mode to evaluate arguments to `TEST_CASE` and `SECTION` (#2817)
+  * Clang-tidy should no longer warn about runtime arguments to these macros being unused in static analysis mode.
+  * Clang-tidy can warn on issues involved arguments to these macros.
+* Added support for literal-zero detectors based on `consteval` constructors
+  * This is required for compiling `REQUIRE((a <=> b) == 0)` against MSVC's stdlib.
+  * Sadly, MSVC still cannot compile this assertion as it does not implement C++20 correctly.
+  * You can use `clang-cl` with MSVC's stdlib instead.
+  * If for some godforsaken reasons you want to understand this better, read the two relevant commits: [`dc51386b9fd61f99ea9c660d01867e6ad489b403`](https://github.com/catchorg/Catch2/commit/dc51386b9fd61f99ea9c660d01867e6ad489b403), and [`0787132fc82a75e3fb255aa9484ca1dc1eff2a30`](https://github.com/catchorg/Catch2/commit/0787132fc82a75e3fb255aa9484ca1dc1eff2a30).
+
+### Miscellaneous
+* Disabled tests for FP random generator reproducibility on non-SSE2 x86 targets (#2796)
+* Modified the in-tree Conan recipe to support Conan 2 (#2805)
+
+
+## 3.5.2
+
+### Fixes
+* Fixed `-Wsubobject-linkage` in the Console reporter (#2794)
+* Fixed adding new CLI Options to lvalue parser using `|` (#2787)
+
+
+## 3.5.1
+
+### Improvements
+* Significantly improved performance of the CLI parsing.
+  * This includes the cost of preparing the CLI parser, so Catch2's binaries start much faster.
+
+### Miscellaneous
+* Added support for Bazel modules (#2781)
+* Added CMake option to disable the build reproducibility settings (#2785)
+* Added `log` library linking to the Meson build (#2784)
+
+
+## 3.5.0
+
+### Improvements
+* Introduced `CATCH_CONFIG_PREFIX_MESSAGES` to prefix only logging macros (#2544)
+  * This means `INFO`, `UNSCOPED_INFO`, `WARN` and `CAPTURE`.
+* Section hints in static analysis mode are now `const`
+  * This prevents Clang-Tidy from complaining about `misc-const-correctness`.
+* `from_range` generator supports C arrays and ranges that require ADL (#2737)
+* Stringification support for `std::optional` now also includes `std::nullopt` (#2740)
+* The Console reporter flushes output after writing benchmark runtime estimate.
+  * This means that you can immediately see for how long the benchmark is expected to run.
+* Added workaround to enable compilation with ICC 19.1 (#2551, #2766)
+* Compiling Catch2 for XBox should work out of the box (#2772)
+  * Catch2 should automatically disable getenv when compiled for XBox.
+* Compiling Catch2 with exceptions disabled no longer triggers `Wunused-function` (#2726)
+* **`random` Generators for integral types are now reproducible across different platforms**
+  * Unlike `<random>`, Catch2's generators also support 1 byte integral types (`char`, `bool`, ...)
+* **`random` Generators for `float` and `double` are now reproducible across different platforms**
+  * `long double` varies across different platforms too much to be reproducible
+  * This guarantee applies only to platforms with IEEE 754 floats.
+
+### Fixes
+* UDL declaration inside Catch2 are now strictly conforming to the standard
+  * `operator "" _a` is UB, `operator ""_a` is fine. Seriously.
+* Fixed `CAPTURE` tests failing to compile in C++23 mode (#2744)
+* Fixed missing include in `catch_message.hpp` (#2758)
+* Fixed `CHECK_ELSE` suppressing failure from uncaught exceptions(#2723)
+
+### Miscellaneous
+* The documentation for specifying which tests to run through commandline has been completely rewritten (#2738)
+* Fixed installation when building Catch2 with meson (#2722, #2742)
+* Fixed `catch_discover_tests` when using custom reporter and `PRE_TEST` discovery mode (#2747)
+* `catch_discover_tests` supports multi-config CMake generator in `PRE_TEST` discovery mode (#2739, #2746)
+
+
+## 3.4.0
+
+### Improvements
+* `VectorEquals` supports elements that provide only `==` and not `!=` (#2648)
+* Catch2 supports compiling with IAR compiler (#2651)
+* Various small internal performance improvements
+* Various small internal compilation time improvements
+* XMLReporter now reports location info for INFO and WARN (#1251)
+  * This bumps up the xml format version to 3
+* Documented that `SKIP` in generator constructor can be used to handle empty  generator (#1593)
+* Added experimental static analysis support to `TEST_CASE` and `SECTION` macros (#2681)
+  * The two macros are redefined in a way that helps the SA tools reason about the possible paths through a test case with sections.
+  * The support is controlled by the `CATCH_CONFIG_EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT` option and autodetects clang-tidy and Coverity.
+* `*_THROWS`, `*_THROWS_AS`, etc now suppress warning coming from `__attribute__((warn_unused_result))` on GCC  (#2691)
+  * Unlike plain `[[nodiscard]]`, this warning is not silenced by void cast. WTF GCC?
+
+### Fixes
+* Fixed `assertionStarting` events being sent after the expr is evaluated (#2678)
+* Errors in `TEST_CASE` tags are now reported nicely (#2650)
+
+### Miscellaneous
+* Bunch of improvements to `catch_discover_tests`
+  * Added DISCOVERY_MODE option, so the discovery can happen either post build or pre-run.
+  * Fixed handling of semicolons and backslashes in test names (#2674, #2676)
+* meson build can disable building tests (#2693)
+* meson build properly sets meson version 0.54.1 as the minimal supported version (#2688)
+
 
 ## 3.3.2
 
@@ -149,7 +331,7 @@
 
 ### Fixes
 * Cleaned out some warnings and static analysis issues
-  * Suppressed `-Wcomma` warning rarely occuring in templated test cases (#2543)
+  * Suppressed `-Wcomma` warning rarely occurring in templated test cases (#2543)
   * Constified implementation details in `INFO` (#2564)
   * Made `MatcherGenericBase` copy constructor const (#2566)
 * Fixed serialization of test filters so the output roundtrips
@@ -352,7 +534,7 @@ v3 releases.
 * Added `STATIC_CHECK` macro, similar to `STATIC_REQUIRE` (#2318)
   * When deferred tu runtime, it behaves like `CHECK`, and not like `REQUIRE`.
 * You can have multiple tests with the same name, as long as other parts of the test identity differ (#1915, #1999, #2175)
-  * Test identity includes test's name, test's tags and and test's class name if applicable.
+  * Test identity includes test's name, test's tags and test's class name if applicable.
 * Added new warning, `UnmatchedTestSpec`, to error on test specs with no matching tests
 * The `-w`, `--warn` warning flags can now be provided multiple times to enable multiple warnings
 * The case-insensitive handling of tags is now more reliable and takes up less memory
@@ -517,7 +699,7 @@ v3 releases.
   * The `SECTION`(s) before the `GENERATE` will not be run multiple times, the following ones will.
 * Added `-D`/`--min-duration` command line flag (#1910)
   * If a test takes longer to finish than the provided value, its name and duration will be printed.
-  * This flag is overriden by setting `-d`/`--duration`.
+  * This flag is overridden by setting `-d`/`--duration`.
 
 ### Fixes
 * `TAPReporter` no longer skips successful assertions (#1983)
@@ -585,7 +767,7 @@ v3 releases.
 ### Fixes
 * Fixed computation of benchmarking column widths in ConsoleReporter (#1885, #1886)
 * Suppressed clang-tidy's `cppcoreguidelines-pro-type-vararg` in assertions (#1901)
-  * It was a false positive trigered by the new warning support workaround
+  * It was a false positive triggered by the new warning support workaround
 * Fixed bug in test specification parser handling of OR'd patterns using escaping (#1905)
 
 ### Miscellaneous
@@ -922,7 +1104,7 @@ v3 releases.
 
 ### Contrib
 * `ParseAndAddCatchTests` has learned how to use `DISABLED` CTest property (#1452)
-* `ParseAndAddCatchTests` now works when there is a whitspace before the test name (#1493)
+* `ParseAndAddCatchTests` now works when there is a whitespace before the test name (#1493)
 
 
 ### Miscellaneous

docs/reporter-events.md

@@ -96,12 +96,12 @@ void assertionStarting( AssertionInfo const& assertionInfo );
 void assertionEnded( AssertionStats const& assertionStats );
 ```
 
-`assertionStarting` is called after the expression is captured, but before
-the assertion expression is evaluated. This might seem like a minor
-distinction, but what it means is that if you have assertion like
-`REQUIRE( a + b == c + d )`, then what happens is that `a + b` and `c + d`
-are evaluated before `assertionStarting` is emitted, while the `==` is
-evaluated after the event.
+The `assertionStarting` event is emitted before the expression in the
+assertion is captured or evaluated and `assertionEnded` is emitted
+afterwards. This means that given assertion like `REQUIRE(a + b == c + d)`,
+Catch2 first emits `assertionStarting` event, then `a + b` and `c + d`
+are evaluated, then their results are captured, the comparison is evaluated,
+and then `assertionEnded` event is emitted.
 
 
 ## Benchmarking events

docs/reporters.md

@@ -5,7 +5,7 @@ Reporters are a customization point for most of Catch2's output, e.g.
 formatting and writing out [assertions (whether passing or failing),
 sections, test cases, benchmarks, and so on](reporter-events.md#top).
 
-Catch2 comes with a bunch of reporters by default (currently 8), and
+Catch2 comes with a bunch of reporters by default (currently 9), and
 you can also write your own reporter. Because multiple reporters can
 be active at the same time, your own reporters do not even have to handle
 all reporter event, just the ones you are interested in, e.g. benchmarks.
@@ -52,7 +52,7 @@ its machine-readable XML output to file `result-junit.xml`, and the
 uses ANSI colour codes for colouring the output.
 
 Using multiple reporters (or one reporter and one-or-more [event
-listeners](event-listener.md#top)) can have surprisingly complex semantics
+listeners](event-listeners.md#top)) can have surprisingly complex semantics
 when using customization points provided to reporters by Catch2, namely
 capturing stdout/stderr from test cases.
 

docs/skipping-passing-failing.md

@@ -9,7 +9,7 @@ In some situations it may not be possible to meaningfully execute a test case,
 for example when the system under test is missing certain hardware capabilities.
 If the required conditions can only be determined at runtime, it often
 doesn't make sense to consider such a test case as either passed or failed,
-because it simply can not run at all.
+because it simply cannot run at all.
 
 To properly express such scenarios, Catch2 provides a way to explicitly
 _skip_ test cases, using the `SKIP` macro:
@@ -84,6 +84,12 @@ exit code, same as it does if no test cases have run. This behaviour can
 be overridden using the [--allow-running-no-tests](command-line.md#no-tests-override)
 flag.
 
+### `SKIP` inside generators
+
+You can also use the `SKIP` macro inside generator's constructor to handle
+cases where the generator is empty, but you do not want to fail the test
+case.
+
 
 ## Passing and failing test cases
 

docs/test-cases-and-sections.md

@@ -48,7 +48,7 @@ For more detail on command line selection see [the command line docs](command-li
 Tag names are not case sensitive and can contain any ASCII characters.
 This means that tags `[tag with spaces]` and `[I said "good day"]`
 are both allowed tags and can be filtered on. However, escapes are not
-supported however and `[\]]` is not a valid tag.
+supported and `[\]]` is not a valid tag.
 
 The same tag can be specified multiple times for a single test case,
 but only one of the instances of identical tags will be kept. Which one
@@ -231,7 +231,7 @@ TEMPLATE_TEST_CASE( "vectors can be sized and resized", "[vector][template]", in
 
 > [Introduced](https://github.com/catchorg/Catch2/issues/1468) in Catch2 2.6.0.
 
-_template-type1_ through _template-typen_ is list of template template
+_template-type1_ through _template-typen_ is list of template
 types which should be combined with each of _template-arg1_ through
  _template-argm_, resulting in _n * m_ test cases. Inside the test case,
 the resulting type is available under the name of `TestType`.

docs/test-fixtures.md

@@ -1,9 +1,30 @@
 <a id="top"></a>
 # Test fixtures
 
-## Defining test fixtures
+**Contents**<br>
+[Non-Templated test fixtures](#non-templated-test-fixtures)<br>
+[Templated test fixtures](#templated-test-fixtures)<br>
+[Signature-based parameterised test fixtures](#signature-based-parametrised-test-fixtures)<br>
+[Template fixtures with types specified in template type lists](#template-fixtures-with-types-specified-in-template-type-lists)<br>
 
-Although Catch allows you to group tests together as [sections within a test case](test-cases-and-sections.md), it can still be convenient, sometimes, to group them using a more traditional test fixture. Catch fully supports this too. You define the test fixture as a simple structure:
+## Non-Templated test fixtures
+
+Although Catch2 allows you to group tests together as 
+[sections within a test case](test-cases-and-sections.md), it can still 
+be convenient, sometimes, to group them using a more traditional test. 
+Catch2 fully supports this too with 3 different macros for 
+non-templated test fixtures. They are: 
+
+| Macro    | Description |
+|----------|-------------|
+|1. `TEST_CASE_METHOD(className, ...)`| Creates a uniquely named class which inherits from the class specified by `className`. The test function will be a member of this derived class. An instance of the derived class will be created for every partial run of the test case. |
+|2. `METHOD_AS_TEST_CASE(member-function, ...)`| Uses `member-function` as the test function. An instance of the class will be created for each partial run of the test case. |
+|3. `TEST_CASE_PERSISTENT_FIXTURE(className, ...)`| Creates a uniquely named class which inherits from the class specified by `className`. The test function will be a member of this derived class. An instance of the derived class will be created at the start of the test run. That instance will be destroyed once the entire test case has ended. |
+
+### 1. `TEST_CASE_METHOD`
+
+
+You define a `TEST_CASE_METHOD` test fixture as a simple structure:
 
 ```c++
 class UniqueTestsFixture {
@@ -30,8 +51,116 @@ class UniqueTestsFixture {
  }
 ```
 
-The two test cases here will create uniquely-named derived classes of UniqueTestsFixture and thus can access the `getID()` protected method and `conn` member variables. This ensures that both the test cases are able to create a DBConnection using the same method (DRY principle) and that any ID's created are unique such that the order that tests are executed does not matter.
+The two test cases here will create uniquely-named derived classes of 
+UniqueTestsFixture and thus can access the `getID()` protected method 
+and `conn` member variables. This ensures that both the test cases 
+are able to create a DBConnection using the same method 
+(DRY principle) and that any ID's created are unique such that the 
+order that tests are executed does not matter. 
 
+### 2. `METHOD_AS_TEST_CASE`
+
+`METHOD_AS_TEST_CASE` lets you register a member function of a class 
+as a Catch2 test case. The class will be separately instantiated 
+for each method registered in this way.
+
+```cpp
+class TestClass {
+    std::string s;
+
+public:
+    TestClass()
+        :s( "hello" )
+    {}
+
+    void testCase() {
+        REQUIRE( s == "hello" );
+    }
+};
+
+
+METHOD_AS_TEST_CASE( TestClass::testCase, "Use class's method as a test case", "[class]" )
+```
+
+This type of fixture is similar to [TEST_CASE_METHOD](#1-test_case_method) except in this 
+case it will directly use the provided class to create an object rather than a derived 
+class.
+
+### 3. `TEST_CASE_PERSISTENT_FIXTURE`
+
+> [Introduced](https://github.com/catchorg/Catch2/pull/2885) in Catch2 3.7.0
+
+`TEST_CASE_PERSISTENT_FIXTURE` behaves in the same way as
+[TEST_CASE_METHOD](#1-test_case_method) except that there will only be
+one instance created throughout the entire run of a test case. To 
+demonstrate this have a look at the following example:
+
+```cpp
+class ClassWithExpensiveSetup {
+public:
+    ClassWithExpensiveSetup() {
+        // expensive construction
+        std::this_thread::sleep_for( std::chrono::seconds( 2 ) );
+    }
+
+    ~ClassWithExpensiveSetup() noexcept {
+        // expensive destruction
+        std::this_thread::sleep_for( std::chrono::seconds( 1 ) );
+    }
+
+    int getInt() const { return 42; }
+};
+
+struct MyFixture {
+    mutable int myInt = 0;
+    ClassWithExpensiveSetup expensive;
+};
+
+TEST_CASE_PERSISTENT_FIXTURE( MyFixture, "Tests with MyFixture" ) {
+
+    const int val = myInt++;
+
+    SECTION( "First partial run" ) {
+        const auto otherValue = expensive.getInt();
+        REQUIRE( val == 0 );
+        REQUIRE( otherValue == 42 );
+    }
+
+    SECTION( "Second partial run" ) { REQUIRE( val == 1 ); }
+}
+```
+
+This example demonstates two possible use-cases of this fixture type:
+1. Improve test run times by reducing the amount of expensive and 
+redundant setup and tear-down required.
+2. Reusing results from the previous partial run, in the current
+partial run.
+
+This test case will be executed twice as there are two leaf sections.
+On the first run `val` will be `0` and on the second run `val` will be 
+`1`. This demonstrates that we were able to use the results of the
+previous partial run in subsequent partial runs.
+
+Additionally, we are simulating an expensive object using 
+`std::this_thread::sleep_for`, but real world use-cases could be:
+1. Creating a D3D12/Vulkan device
+2. Connecting to a database
+3. Loading a file.
+
+The fixture object (`MyFixture`) will be constructed just before the
+test case begins, and it will be destroyed just after the test case 
+ends. Therefore, this expensive object will only be created and 
+destroyed once during the execution of this test case. If we had used 
+`TEST_CASE_METHOD`, `MyFixture` would have been created and destroyed 
+twice during the execution of this test case.
+
+NOTE: The member function which runs the test case is `const`. Therefore 
+if you want to mutate any member of the fixture it must be marked as
+`mutable` as shown in this example. This is to make it clear that
+the initial state of the fixture is intended to mutate during the
+execution of the test case.
+
+## Templated test fixtures
 
 Catch2 also provides `TEMPLATE_TEST_CASE_METHOD` and
 `TEMPLATE_PRODUCT_TEST_CASE_METHOD` that can be used together
@@ -93,7 +222,7 @@ _While there is an upper limit on the number of types you can specify
 in single `TEMPLATE_TEST_CASE_METHOD` or `TEMPLATE_PRODUCT_TEST_CASE_METHOD`,
 the limit is very high and should not be encountered in practice._
 
-## Signature-based parametrised test fixtures
+## Signature-based parameterised test fixtures
 
 > [Introduced](https://github.com/catchorg/Catch2/issues/1609) in Catch2 2.8.0.
 

docs/tostring.md

@@ -75,7 +75,7 @@ CATCH_TRANSLATE_EXCEPTION( MyType const& ex ) {
 
 Enums that already have a `<<` overload for `std::ostream` will convert to strings as expected.
 If you only need to convert enums to strings for test reporting purposes you can provide a `StringMaker` specialisations as any other type.
-However, as a convenience, Catch provides the `REGISTER_ENUM` helper macro that will generate the `StringMaker` specialiation for you with minimal code.
+However, as a convenience, Catch provides the `REGISTER_ENUM` helper macro that will generate the `StringMaker` specialisation for you with minimal code.
 Simply provide it the (qualified) enum name, followed by all the enum values, and you're done!
 
 E.g.

docs/tutorial.md

@@ -16,7 +16,7 @@ Ideally you should be using Catch2 through its [CMake integration](cmake-integra
 Catch2 also provides pkg-config files and two file (header + cpp)
 distribution, but this documentation will assume you are using CMake. If
 you are using the two file distribution instead, remember to replace
-the included header with `catch_amalgamated.hpp`.
+the included header with `catch_amalgamated.hpp` ([step by step instructions](migrate-v2-to-v3.md#how-to-migrate-projects-from-v2-to-v3)).
 
 
 ## Writing tests
@@ -119,7 +119,7 @@ This is best explained through an example ([code](../examples/100-Fix-Section.cp
 
 ```c++
 TEST_CASE( "vectors can be sized and resized", "[vector]" ) {
-
+    // This setup will be done 4 times in total, once for each section
     std::vector<int> v( 5 );
 
     REQUIRE( v.size() == 5 );
@@ -152,11 +152,12 @@ TEST_CASE( "vectors can be sized and resized", "[vector]" ) {
 }
 ```
 
-For each `SECTION` the `TEST_CASE` is executed from the start. This means
+For each `SECTION` the `TEST_CASE` is **executed from the start**. This means
 that each section is entered with a freshly constructed vector `v`, that
 we know has size 5 and capacity at least 5, because the two assertions
-are also checked before the section is entered. Each run through a test
-case will execute one, and only one, leaf section.
+are also checked before the section is entered. This behaviour may not be
+ideal for tests where setup is expensive. Each run through a test case will
+execute one, and only one, leaf section.
 
 Section can also be nested, in which case the parent section can be
 entered multiple times, once for each leaf section. Nested sections are

docs/why-catch.md

@@ -30,7 +30,7 @@ So what does Catch2 bring to the party that differentiates it from these? Apart
 * Output is through modular reporter objects. Basic textual and XML reporters are included. Custom reporters can easily be added.
 * JUnit xml output is supported for integration with third-party tools, such as CI servers.
 * A default main() function is provided, but you can supply your own for complete control (e.g. integration into your own test runner GUI).
-* A command line parser is provided and can still be used if you choose to provided your own main() function.
+* A command line parser is provided and can still be used if you choose to provide your own main() function.
 * Alternative assertion macro(s) report failures but don't abort the test case
 * Good set of facilities for floating point comparisons (`Catch::Approx` and full set of matchers)
 * Internal and friendly macros are isolated so name clashes can be managed
@@ -41,8 +41,8 @@ So what does Catch2 bring to the party that differentiates it from these? Apart
 
 ## Who else is using Catch2?
 
-A whole lot of people. According to the 2021 JetBrains C++ ecosystem survey,
-about 11% of C++ programmers use Catch2 for unit testing, making it the
+A whole lot of people. According to [the 2022 JetBrains C++ ecosystem survey](https://www.jetbrains.com/lp/devecosystem-2022/cpp/#Which-unit-testing-frameworks-do-you-regularly-use),
+about 12% of C++ programmers use Catch2 for unit testing, making it the
 second most popular unit testing framework.
 
 You can also take a look at the (incomplete) list of [open source projects](opensource-users.md#top)

examples/010-TestCase.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 010-TestCase.cpp
 // And write tests in the same file:
 #include <catch2/catch_test_macros.hpp>

examples/020-TestCase-1.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 020-TestCase-1.cpp
 
 #include <catch2/catch_test_macros.hpp>

examples/020-TestCase-2.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 020-TestCase-2.cpp
 
 // main() provided by Catch in file 020-TestCase-1.cpp.

examples/030-Asn-Require-Check.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 030-Asn-Require-Check.cpp
 
 // Catch has two natural expression assertion macro's:

examples/100-Fix-Section.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 100-Fix-Section.cpp
 
 // Catch has two ways to express fixtures:

examples/110-Fix-ClassFixture.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 110-Fix-ClassFixture.cpp
 
 // Catch has two ways to express fixtures:

examples/111-Fix-PersistentFixture.cpp

@@ -0,0 +1,74 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
+// Fixture.cpp
+
+// Catch2 has three ways to express fixtures:
+// - Sections
+// - Traditional class-based fixtures that are created and destroyed on every
+// partial run
+// - Traditional class-based fixtures that are created at the start of a test
+// case and destroyed at the end of a test case (this file)
+
+// main() provided by linkage to Catch2WithMain
+
+#include <catch2/catch_test_macros.hpp>
+
+#include <thread>
+
+class ClassWithExpensiveSetup {
+public:
+    ClassWithExpensiveSetup() {
+        // Imagine some really expensive set up here.
+        // e.g.
+        // setting up a D3D12/Vulkan Device,
+        // connecting to a database,
+        // loading a file
+        // etc etc etc
+        std::this_thread::sleep_for( std::chrono::seconds( 2 ) );
+    }
+
+    ~ClassWithExpensiveSetup() noexcept {
+        // We can do any clean up of the expensive class in the destructor
+        // e.g.
+        // destroy D3D12/Vulkan Device,
+        // disconnecting from a database,
+        // release file handle
+        // etc etc etc
+        std::this_thread::sleep_for( std::chrono::seconds( 1 ) );
+    }
+
+    int getInt() const { return 42; }
+};
+
+struct MyFixture {
+
+    // The test case member function is const.
+    // Therefore we need to mark any member of the fixture
+    // that needs to mutate as mutable.
+    mutable int myInt = 0;
+    ClassWithExpensiveSetup expensive;
+};
+
+// Only one object of type MyFixture will be instantiated for the run
+// of this test case even though there are two leaf sections.
+// This is useful if your test case requires an object that is
+// expensive to create and could be reused for each partial run of the
+// test case.
+TEST_CASE_PERSISTENT_FIXTURE( MyFixture, "Tests with MyFixture" ) {
+
+    const int val = myInt++;
+
+    SECTION( "First partial run" ) {
+        const auto otherValue = expensive.getInt();
+        REQUIRE( val == 0 );
+        REQUIRE( otherValue == 42 );
+    }
+
+    SECTION( "Second partial run" ) { REQUIRE( val == 1 ); }
+}

examples/120-Bdd-ScenarioGivenWhenThen.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 120-Bdd-ScenarioGivenWhenThen.cpp
 
 // main() provided by linkage with Catch2WithMain

examples/210-Evt-EventListeners.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 210-Evt-EventListeners.cpp
 
 // Contents:
@@ -377,8 +385,7 @@ struct MyListener : Catch::EventListenerBase {
 CATCH_REGISTER_LISTENER( MyListener )
 
 // Get rid of Wweak-tables
-MyListener::~MyListener() {}
-
+MyListener::~MyListener() = default;
 
 // -----------------------------------------------------------------------
 // 3. Test cases:

examples/231-Cfg-OutputStreams.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 231-Cfg-OutputStreams.cpp
 // Show how to replace the streams with a simple custom made streambuf.
 
@@ -14,7 +22,7 @@ class out_buff : public std::stringbuf {
     std::FILE* m_stream;
 public:
     out_buff(std::FILE* stream):m_stream(stream) {}
-    ~out_buff();
+    ~out_buff() override;
     int sync() override {
         int ret = 0;
         for (unsigned char c : str()) {

examples/232-Cfg-CustomMain.cpp

@@ -0,0 +1,41 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
+// 232-Cfg-CustomMain.cpp
+// Show how to use custom main and add a custom option to the CLI parser
+
+#include <catch2/catch_session.hpp>
+
+#include <iostream>
+
+int main(int argc, char** argv) {
+  Catch::Session session; // There must be exactly one instance
+
+  int height = 0; // Some user variable you want to be able to set
+
+  // Build a new parser on top of Catch2's
+  using namespace Catch::Clara;
+  auto cli
+    = session.cli()           // Get Catch2's command line parser
+    | Opt( height, "height" ) // bind variable to a new option, with a hint string
+         ["--height"]         // the option names it will respond to
+         ("how high?");       // description string for the help output
+
+  // Now pass the new composite back to Catch2 so it uses that
+  session.cli( cli );
+
+  // Let Catch2 (using Clara) parse the command line
+  int returnCode = session.applyCommandLine( argc, argv );
+  if( returnCode != 0 ) // Indicates a command line error
+      return returnCode;
+
+  // if set on the command line then 'height' is now set at this point
+  std::cout << "height: " << height << '\n';
+
+  return session.run();
+}

examples/300-Gen-OwnGenerator.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 300-Gen-OwnGenerator.cpp
 // Shows how to define a custom generator.
 
@@ -13,7 +21,7 @@
 namespace {
 
 // This class shows how to implement a simple generator for Catch tests
-class RandomIntGenerator : public Catch::Generators::IGenerator<int> {
+class RandomIntGenerator final : public Catch::Generators::IGenerator<int> {
     std::minstd_rand m_rand;
     std::uniform_int_distribution<> m_dist;
     int current_number;

examples/301-Gen-MapTypeConversion.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 301-Gen-MapTypeConversion.cpp
 // Shows how to use map to modify generator's return type.
 
@@ -16,12 +24,12 @@ namespace {
 // Returns a line from a stream. You could have it e.g. read lines from
 // a file, but to avoid problems with paths in examples, we will use
 // a fixed stringstream.
-class LineGenerator : public Catch::Generators::IGenerator<std::string> {
+class LineGenerator final : public Catch::Generators::IGenerator<std::string> {
     std::string m_line;
     std::stringstream m_stream;
 public:
-    LineGenerator() {
-        m_stream.str("1\n2\n3\n4\n");
+    explicit LineGenerator( std::string const& lines ) {
+        m_stream.str( lines );
         if (!next()) {
             Catch::Generators::Detail::throw_generator_exception("Couldn't read a single line");
         }
@@ -41,18 +49,19 @@ std::string const& LineGenerator::get() const {
 // This helper function provides a nicer UX when instantiating the generator
 // Notice that it returns an instance of GeneratorWrapper<std::string>, which
 // is a value-wrapper around std::unique_ptr<IGenerator<std::string>>.
-Catch::Generators::GeneratorWrapper<std::string> lines(std::string /* ignored for example */) {
+Catch::Generators::GeneratorWrapper<std::string>
+lines( std::string const& lines ) {
     return Catch::Generators::GeneratorWrapper<std::string>(
-        new LineGenerator()
-    );
+        new LineGenerator( lines ) );
 }
 
 } // end anonymous namespace
 
 
 TEST_CASE("filter can convert types inside the generator expression", "[example][generator]") {
-    auto num = GENERATE(map<int>([](std::string const& line) { return std::stoi(line); },
-                                 lines("fake-file")));
+    auto num = GENERATE(
+        map<int>( []( std::string const& line ) { return std::stoi( line ); },
+                  lines( "1\n2\n3\n4\n" ) ) );
 
     REQUIRE(num > 0);
 }

examples/302-Gen-Table.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 302-Gen-Table.cpp
 // Shows how to use table to run a test many times with different inputs. Lifted from examples on
 // issue #850.
@@ -44,11 +52,11 @@ TEST_CASE("Table allows pre-computed test inputs and outputs", "[example][genera
 
 /* Possible simplifications where less legacy toolchain support is needed:
  *
- * - With libstdc++6 or newer, the make_tuple() calls can be ommitted
+ * - With libstdc++6 or newer, the make_tuple() calls can be omitted
  * (technically C++17 but does not require -std in GCC/Clang). See
  *   https://stackoverflow.com/questions/12436586/tuple-vector-and-initializer-list
  *
- * - In C++17 mode std::tie() and the preceding variable delcarations can be
+ * - In C++17 mode std::tie() and the preceding variable declarations can be
  * replaced by structured bindings: auto [test_input, expected] = GENERATE(
  * table<std::string, size_t>({ ...
  */

examples/310-Gen-VariablesInGenerators.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 310-Gen-VariablesInGenerator.cpp
 // Shows how to use variables when creating generators.
 

examples/311-Gen-CustomCapture.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 311-Gen-CustomCapture.cpp
 // Shows how to provide custom capture list to the generator expression
 

examples/CMakeLists.txt

@@ -28,8 +28,10 @@ set( SOURCES_IDIOMATIC_EXAMPLES
     030-Asn-Require-Check.cpp
     100-Fix-Section.cpp
     110-Fix-ClassFixture.cpp
+    111-Fix-PersistentFixture.cpp
     120-Bdd-ScenarioGivenWhenThen.cpp
     210-Evt-EventListeners.cpp
+    232-Cfg-CustomMain.cpp
     300-Gen-OwnGenerator.cpp
     301-Gen-MapTypeConversion.cpp
     302-Gen-Table.cpp
@@ -42,8 +44,7 @@ set( TARGETS_IDIOMATIC_EXAMPLES ${BASENAMES_IDIOMATIC_EXAMPLES} )
 
 
 foreach( name ${TARGETS_IDIOMATIC_EXAMPLES} )
-    add_executable( ${name}
-      ${EXAMPLES_DIR}/${name}.cpp )
+    add_executable( ${name} ${name}.cpp )
 endforeach()
 
 set(ALL_EXAMPLE_TARGETS
@@ -53,7 +54,7 @@ set(ALL_EXAMPLE_TARGETS
 )
 
 foreach( name ${ALL_EXAMPLE_TARGETS} )
-    target_link_libraries( ${name} Catch2 Catch2WithMain )
+    target_link_libraries( ${name} Catch2WithMain )
 endforeach()
 
 

extras/Catch.cmake

@@ -35,8 +35,9 @@ same as the Catch name; see also ``TEST_PREFIX`` and ``TEST_SUFFIX``.
                          [TEST_LIST var]
                          [REPORTER reporter]
                          [OUTPUT_DIR dir]
-                         [OUTPUT_PREFIX prefix}
+                         [OUTPUT_PREFIX prefix]
                          [OUTPUT_SUFFIX suffix]
+                         [DISCOVERY_MODE <POST_BUILD|PRE_TEST>]
     )
 
   ``catch_discover_tests`` sets up a post-build command on the test executable
@@ -123,15 +124,36 @@ same as the Catch name; see also ``TEST_PREFIX`` and ``TEST_SUFFIX``.
     test executable and when the tests are executed themselves. This requires
     cmake/ctest >= 3.22.
 
+  ``DL_FRAMEWORK_PATHS path...``
+    Specifies paths that need to be set for the dynamic linker to find libraries
+    packaged as frameworks on Apple platforms when running the test executable
+    (DYLD_FRAMEWORK_PATH). These paths will both be set when retrieving the list
+    of test cases from the test executable and when the tests are executed themselves.
+    This requires cmake/ctest >= 3.22.
+
+  `DISCOVERY_MODE mode``
+    Provides control over when ``catch_discover_tests`` performs test discovery.
+    By default, ``POST_BUILD`` sets up a post-build command to perform test discovery
+    at build time. In certain scenarios, like cross-compiling, this ``POST_BUILD``
+    behavior is not desirable. By contrast, ``PRE_TEST`` delays test discovery until
+    just prior to test execution. This way test discovery occurs in the target environment
+    where the test has a better chance at finding appropriate runtime dependencies.
+
+    ``DISCOVERY_MODE`` defaults to the value of the
+    ``CMAKE_CATCH_DISCOVER_TESTS_DISCOVERY_MODE`` variable if it is not passed when
+    calling ``catch_discover_tests``. This provides a mechanism for globally selecting
+    a preferred test discovery behavior without having to modify each call site.
+
 #]=======================================================================]
 
 #------------------------------------------------------------------------------
 function(catch_discover_tests TARGET)
+
   cmake_parse_arguments(
     ""
     ""
-    "TEST_PREFIX;TEST_SUFFIX;WORKING_DIRECTORY;TEST_LIST;REPORTER;OUTPUT_DIR;OUTPUT_PREFIX;OUTPUT_SUFFIX"
-    "TEST_SPEC;EXTRA_ARGS;PROPERTIES;DL_PATHS"
+    "TEST_PREFIX;TEST_SUFFIX;WORKING_DIRECTORY;TEST_LIST;REPORTER;OUTPUT_DIR;OUTPUT_PREFIX;OUTPUT_SUFFIX;DISCOVERY_MODE"
+    "TEST_SPEC;EXTRA_ARGS;PROPERTIES;DL_PATHS;DL_FRAMEWORK_PATHS"
     ${ARGN}
   )
 
@@ -141,11 +163,20 @@ function(catch_discover_tests TARGET)
   if(NOT _TEST_LIST)
     set(_TEST_LIST ${TARGET}_TESTS)
   endif()
-
-  if (_DL_PATHS)
-    if(${CMAKE_VERSION} VERSION_LESS "3.22.0")
-        message(FATAL_ERROR "The DL_PATHS option requires at least cmake 3.22")
+  if(_DL_PATHS AND ${CMAKE_VERSION} VERSION_LESS "3.22.0")
+    message(FATAL_ERROR "The DL_PATHS option requires at least cmake 3.22")
+  endif()
+  if(_DL_FRAMEWORK_PATHS AND ${CMAKE_VERSION} VERSION_LESS "3.22.0")
+    message(FATAL_ERROR "The DL_FRAMEWORK_PATHS option requires at least cmake 3.22")
+  endif()
+  if(NOT _DISCOVERY_MODE)
+    if(NOT CMAKE_CATCH_DISCOVER_TESTS_DISCOVERY_MODE)
+      set(CMAKE_CATCH_DISCOVER_TESTS_DISCOVERY_MODE "POST_BUILD")
     endif()
+    set(_DISCOVERY_MODE ${CMAKE_CATCH_DISCOVER_TESTS_DISCOVERY_MODE})
+  endif()
+  if (NOT _DISCOVERY_MODE MATCHES "^(POST_BUILD|PRE_TEST)$")
+    message(FATAL_ERROR "Unknown DISCOVERY_MODE: ${_DISCOVERY_MODE}")
   endif()
 
   ## Generate a unique name based on the extra arguments
@@ -153,45 +184,110 @@ function(catch_discover_tests TARGET)
   string(SUBSTRING ${args_hash} 0 7 args_hash)
 
   # Define rule to generate test list for aforementioned test executable
-  set(ctest_include_file "${CMAKE_CURRENT_BINARY_DIR}/${TARGET}_include-${args_hash}.cmake")
-  set(ctest_tests_file "${CMAKE_CURRENT_BINARY_DIR}/${TARGET}_tests-${args_hash}.cmake")
+  set(ctest_file_base "${CMAKE_CURRENT_BINARY_DIR}/${TARGET}-${args_hash}")
+  set(ctest_include_file "${ctest_file_base}_include.cmake")
+  set(ctest_tests_file "${ctest_file_base}_tests.cmake")
+
   get_property(crosscompiling_emulator
     TARGET ${TARGET}
     PROPERTY CROSSCOMPILING_EMULATOR
   )
-  add_custom_command(
-    TARGET ${TARGET} POST_BUILD
-    BYPRODUCTS "${ctest_tests_file}"
-    COMMAND "${CMAKE_COMMAND}"
-            -D "TEST_TARGET=${TARGET}"
-            -D "TEST_EXECUTABLE=$<TARGET_FILE:${TARGET}>"
-            -D "TEST_EXECUTOR=${crosscompiling_emulator}"
-            -D "TEST_WORKING_DIR=${_WORKING_DIRECTORY}"
-            -D "TEST_SPEC=${_TEST_SPEC}"
-            -D "TEST_EXTRA_ARGS=${_EXTRA_ARGS}"
-            -D "TEST_PROPERTIES=${_PROPERTIES}"
-            -D "TEST_PREFIX=${_TEST_PREFIX}"
-            -D "TEST_SUFFIX=${_TEST_SUFFIX}"
-            -D "TEST_LIST=${_TEST_LIST}"
-            -D "TEST_REPORTER=${_REPORTER}"
-            -D "TEST_OUTPUT_DIR=${_OUTPUT_DIR}"
-            -D "TEST_OUTPUT_PREFIX=${_OUTPUT_PREFIX}"
-            -D "TEST_OUTPUT_SUFFIX=${_OUTPUT_SUFFIX}"
-            -D "TEST_DL_PATHS=${_DL_PATHS}"
-            -D "CTEST_FILE=${ctest_tests_file}"
-            -P "${_CATCH_DISCOVER_TESTS_SCRIPT}"
-    VERBATIM
-  )
 
-  file(WRITE "${ctest_include_file}"
-    "if(EXISTS \"${ctest_tests_file}\")\n"
-    "  include(\"${ctest_tests_file}\")\n"
-    "else()\n"
-    "  add_test(${TARGET}_NOT_BUILT-${args_hash} ${TARGET}_NOT_BUILT-${args_hash})\n"
-    "endif()\n"
-  )
+  if(_DISCOVERY_MODE STREQUAL "POST_BUILD")
+    add_custom_command(
+      TARGET ${TARGET} POST_BUILD
+      BYPRODUCTS "${ctest_tests_file}"
+      COMMAND "${CMAKE_COMMAND}"
+              -D "TEST_TARGET=${TARGET}"
+              -D "TEST_EXECUTABLE=$<TARGET_FILE:${TARGET}>"
+              -D "TEST_EXECUTOR=${crosscompiling_emulator}"
+              -D "TEST_WORKING_DIR=${_WORKING_DIRECTORY}"
+              -D "TEST_SPEC=${_TEST_SPEC}"
+              -D "TEST_EXTRA_ARGS=${_EXTRA_ARGS}"
+              -D "TEST_PROPERTIES=${_PROPERTIES}"
+              -D "TEST_PREFIX=${_TEST_PREFIX}"
+              -D "TEST_SUFFIX=${_TEST_SUFFIX}"
+              -D "TEST_LIST=${_TEST_LIST}"
+              -D "TEST_REPORTER=${_REPORTER}"
+              -D "TEST_OUTPUT_DIR=${_OUTPUT_DIR}"
+              -D "TEST_OUTPUT_PREFIX=${_OUTPUT_PREFIX}"
+              -D "TEST_OUTPUT_SUFFIX=${_OUTPUT_SUFFIX}"
+              -D "TEST_DL_PATHS=${_DL_PATHS}"
+              -D "TEST_DL_FRAMEWORK_PATHS=${_DL_FRAMEWORK_PATHS}"
+              -D "CTEST_FILE=${ctest_tests_file}"
+              -P "${_CATCH_DISCOVER_TESTS_SCRIPT}"
+      VERBATIM
+    )
 
-  if(NOT ${CMAKE_VERSION} VERSION_LESS "3.10.0") 
+    file(WRITE "${ctest_include_file}"
+      "if(EXISTS \"${ctest_tests_file}\")\n"
+      "  include(\"${ctest_tests_file}\")\n"
+      "else()\n"
+      "  add_test(${TARGET}_NOT_BUILT-${args_hash} ${TARGET}_NOT_BUILT-${args_hash})\n"
+      "endif()\n"
+    )
+
+  elseif(_DISCOVERY_MODE STREQUAL "PRE_TEST")
+
+    get_property(GENERATOR_IS_MULTI_CONFIG GLOBAL
+        PROPERTY GENERATOR_IS_MULTI_CONFIG
+    )
+
+    if(GENERATOR_IS_MULTI_CONFIG)
+      set(ctest_tests_file "${ctest_file_base}_tests-$<CONFIG>.cmake")
+    endif()
+
+    string(CONCAT ctest_include_content
+      "if(EXISTS \"$<TARGET_FILE:${TARGET}>\")"                                    "\n"
+      "  if(NOT EXISTS \"${ctest_tests_file}\" OR"                                 "\n"
+      "     NOT \"${ctest_tests_file}\" IS_NEWER_THAN \"$<TARGET_FILE:${TARGET}>\" OR\n"
+      "     NOT \"${ctest_tests_file}\" IS_NEWER_THAN \"\${CMAKE_CURRENT_LIST_FILE}\")\n"
+      "    include(\"${_CATCH_DISCOVER_TESTS_SCRIPT}\")"                           "\n"
+      "    catch_discover_tests_impl("                                             "\n"
+      "      TEST_EXECUTABLE"        " [==[" "$<TARGET_FILE:${TARGET}>"   "]==]"   "\n"
+      "      TEST_EXECUTOR"          " [==[" "${crosscompiling_emulator}" "]==]"   "\n"
+      "      TEST_WORKING_DIR"       " [==[" "${_WORKING_DIRECTORY}"      "]==]"   "\n"
+      "      TEST_SPEC"              " [==[" "${_TEST_SPEC}"              "]==]"   "\n"
+      "      TEST_EXTRA_ARGS"        " [==[" "${_EXTRA_ARGS}"             "]==]"   "\n"
+      "      TEST_PROPERTIES"        " [==[" "${_PROPERTIES}"             "]==]"   "\n"
+      "      TEST_PREFIX"            " [==[" "${_TEST_PREFIX}"            "]==]"   "\n"
+      "      TEST_SUFFIX"            " [==[" "${_TEST_SUFFIX}"            "]==]"   "\n"
+      "      TEST_LIST"              " [==[" "${_TEST_LIST}"              "]==]"   "\n"
+      "      TEST_REPORTER"          " [==[" "${_REPORTER}"               "]==]"   "\n"
+      "      TEST_OUTPUT_DIR"        " [==[" "${_OUTPUT_DIR}"             "]==]"   "\n"
+      "      TEST_OUTPUT_PREFIX"     " [==[" "${_OUTPUT_PREFIX}"          "]==]"   "\n"
+      "      TEST_OUTPUT_SUFFIX"     " [==[" "${_OUTPUT_SUFFIX}"          "]==]"   "\n"
+      "      CTEST_FILE"             " [==[" "${ctest_tests_file}"        "]==]"   "\n"
+      "      TEST_DL_PATHS"          " [==[" "${_DL_PATHS}"               "]==]"   "\n"
+      "      TEST_DL_FRAMEWORK_PATHS" " [==[" "${_DL_FRAMEWORK_PATHS}"     "]==]"   "\n"
+      "      CTEST_FILE"             " [==[" "${CTEST_FILE}"              "]==]"   "\n"
+      "    )"                                                                      "\n"
+      "  endif()"                                                                  "\n"
+      "  include(\"${ctest_tests_file}\")"                                         "\n"
+      "else()"                                                                     "\n"
+      "  add_test(${TARGET}_NOT_BUILT ${TARGET}_NOT_BUILT)"                        "\n"
+      "endif()"                                                                    "\n"
+    )
+
+    if(GENERATOR_IS_MULTI_CONFIG)
+      foreach(_config ${CMAKE_CONFIGURATION_TYPES})
+        file(GENERATE OUTPUT "${ctest_file_base}_include-${_config}.cmake" CONTENT "${ctest_include_content}" CONDITION $<CONFIG:${_config}>)
+      endforeach()
+      string(CONCAT ctest_include_multi_content
+        "if(NOT CTEST_CONFIGURATION_TYPE)"                                              "\n"
+        "  message(\"No configuration for testing specified, use '-C <cfg>'.\")"        "\n"
+        "else()"                                                                        "\n"
+        "  include(\"${ctest_file_base}_include-\${CTEST_CONFIGURATION_TYPE}.cmake\")"  "\n"
+        "endif()"                                                                       "\n"
+      )
+      file(GENERATE OUTPUT "${ctest_include_file}" CONTENT "${ctest_include_multi_content}")
+    else()
+      file(GENERATE OUTPUT "${ctest_file_base}_include.cmake" CONTENT "${ctest_include_content}")
+      file(WRITE "${ctest_include_file}" "include(\"${ctest_file_base}_include.cmake\")")
+    endif()
+  endif()
+
+  if(NOT ${CMAKE_VERSION} VERSION_LESS "3.10.0")
     # Add discovered tests to directory TEST_INCLUDE_FILES
     set_property(DIRECTORY
       APPEND PROPERTY TEST_INCLUDE_FILES "${ctest_include_file}"
@@ -204,9 +300,7 @@ function(catch_discover_tests TARGET)
         PROPERTY TEST_INCLUDE_FILE "${ctest_include_file}"
       )
     else()
-      message(FATAL_ERROR
-        "Cannot set more than one TEST_INCLUDE_FILE"
-      )
+      message(FATAL_ERROR "Cannot set more than one TEST_INCLUDE_FILE")
     endif()
   endif()
 

extras/CatchAddTests.cmake

@@ -1,28 +1,6 @@
 # Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
 # file Copyright.txt or https://cmake.org/licensing for details.
 
-set(prefix "${TEST_PREFIX}")
-set(suffix "${TEST_SUFFIX}")
-set(spec ${TEST_SPEC})
-set(extra_args ${TEST_EXTRA_ARGS})
-set(properties ${TEST_PROPERTIES})
-set(reporter ${TEST_REPORTER})
-set(output_dir ${TEST_OUTPUT_DIR})
-set(output_prefix ${TEST_OUTPUT_PREFIX})
-set(output_suffix ${TEST_OUTPUT_SUFFIX})
-set(dl_paths ${TEST_DL_PATHS})
-set(script)
-set(suite)
-set(tests)
-
-if(WIN32)
-  set(dl_paths_variable_name PATH)
-elseif(APPLE)
-  set(dl_paths_variable_name DYLD_LIBRARY_PATH)
-else()
-  set(dl_paths_variable_name LD_LIBRARY_PATH)
-endif()
-
 function(add_command NAME)
   set(_args "")
   # use ARGV* instead of ARGN, because ARGN splits arrays into multiple arguments
@@ -38,119 +16,196 @@ function(add_command NAME)
   set(script "${script}${NAME}(${_args})\n" PARENT_SCOPE)
 endfunction()
 
-# Run test executable to get list of available tests
-if(NOT EXISTS "${TEST_EXECUTABLE}")
-  message(FATAL_ERROR
-    "Specified test executable '${TEST_EXECUTABLE}' does not exist"
+function(catch_discover_tests_impl)
+
+  cmake_parse_arguments(
+    ""
+    ""
+    "TEST_EXECUTABLE;TEST_WORKING_DIR;TEST_OUTPUT_DIR;TEST_OUTPUT_PREFIX;TEST_OUTPUT_SUFFIX;TEST_PREFIX;TEST_REPORTER;TEST_SPEC;TEST_SUFFIX;TEST_LIST;CTEST_FILE"
+    "TEST_EXTRA_ARGS;TEST_PROPERTIES;TEST_EXECUTOR;TEST_DL_PATHS;TEST_DL_FRAMEWORK_PATHS"
+    ${ARGN}
   )
-endif()
 
-if(dl_paths)
-  cmake_path(CONVERT "${dl_paths}" TO_NATIVE_PATH_LIST paths)
-  set(ENV{${dl_paths_variable_name}} "${paths}")
-endif()
+  set(prefix "${_TEST_PREFIX}")
+  set(suffix "${_TEST_SUFFIX}")
+  set(spec ${_TEST_SPEC})
+  set(extra_args ${_TEST_EXTRA_ARGS})
+  set(properties ${_TEST_PROPERTIES})
+  set(reporter ${_TEST_REPORTER})
+  set(output_dir ${_TEST_OUTPUT_DIR})
+  set(output_prefix ${_TEST_OUTPUT_PREFIX})
+  set(output_suffix ${_TEST_OUTPUT_SUFFIX})
+  set(dl_paths ${_TEST_DL_PATHS})
+  set(dl_framework_paths ${_TEST_DL_FRAMEWORK_PATHS})
+  set(environment_modifications "")
+  set(script)
+  set(suite)
+  set(tests)
 
-execute_process(
-  COMMAND ${TEST_EXECUTOR} "${TEST_EXECUTABLE}" ${spec} --list-tests --verbosity quiet
-  OUTPUT_VARIABLE output
-  RESULT_VARIABLE result
-  WORKING_DIRECTORY "${TEST_WORKING_DIR}"
-)
-if(NOT ${result} EQUAL 0)
-  message(FATAL_ERROR
-    "Error running test executable '${TEST_EXECUTABLE}':\n"
-    "  Result: ${result}\n"
-    "  Output: ${output}\n"
-  )
-endif()
-
-string(REPLACE "\n" ";" output "${output}")
-
-# Run test executable to get list of available reporters
-execute_process(
-  COMMAND ${TEST_EXECUTOR} "${TEST_EXECUTABLE}" ${spec} --list-reporters
-  OUTPUT_VARIABLE reporters_output
-  RESULT_VARIABLE reporters_result
-  WORKING_DIRECTORY "${TEST_WORKING_DIR}"
-)
-if(NOT ${reporters_result} EQUAL 0)
-  message(FATAL_ERROR
-    "Error running test executable '${TEST_EXECUTABLE}':\n"
-    "  Result: ${reporters_result}\n"
-    "  Output: ${reporters_output}\n"
-  )
-endif()
-string(FIND "${reporters_output}" "${reporter}" reporter_is_valid)
-if(reporter AND ${reporter_is_valid} EQUAL -1)
-  message(FATAL_ERROR
-    "\"${reporter}\" is not a valid reporter!\n"
-  )
-endif()
-
-# Prepare reporter
-if(reporter)
-  set(reporter_arg "--reporter ${reporter}")
-endif()
-
-# Prepare output dir
-if(output_dir AND NOT IS_ABSOLUTE ${output_dir})
-  set(output_dir "${TEST_WORKING_DIR}/${output_dir}")
-  if(NOT EXISTS ${output_dir})
-    file(MAKE_DIRECTORY ${output_dir})
+  if(WIN32)
+    set(dl_paths_variable_name PATH)
+  elseif(APPLE)
+    set(dl_paths_variable_name DYLD_LIBRARY_PATH)
+  else()
+    set(dl_paths_variable_name LD_LIBRARY_PATH)
   endif()
-endif()
 
-if(dl_paths)
-  foreach(path ${dl_paths})
-    cmake_path(NATIVE_PATH path native_path)
-    list(APPEND environment_modifications "${dl_paths_variable_name}=path_list_prepend:${native_path}")
+  # Run test executable to get list of available tests
+  if(NOT EXISTS "${_TEST_EXECUTABLE}")
+    message(FATAL_ERROR
+      "Specified test executable '${_TEST_EXECUTABLE}' does not exist"
+    )
+  endif()
+
+  if(dl_paths)
+    cmake_path(CONVERT "$ENV{${dl_paths_variable_name}}" TO_NATIVE_PATH_LIST env_dl_paths)
+    list(PREPEND env_dl_paths "${dl_paths}")
+    cmake_path(CONVERT "${env_dl_paths}" TO_NATIVE_PATH_LIST paths)
+    set(ENV{${dl_paths_variable_name}} "${paths}")
+  endif()
+
+  if(APPLE AND dl_framework_paths)
+    cmake_path(CONVERT "$ENV{DYLD_FRAMEWORK_PATH}" TO_NATIVE_PATH_LIST env_dl_framework_paths)
+    list(PREPEND env_dl_framework_paths "${dl_framework_paths}")
+    cmake_path(CONVERT "${env_dl_framework_paths}" TO_NATIVE_PATH_LIST paths)
+    set(ENV{DYLD_FRAMEWORK_PATH} "${paths}")
+  endif()
+
+  execute_process(
+    COMMAND ${_TEST_EXECUTOR} "${_TEST_EXECUTABLE}" ${spec} --list-tests --verbosity quiet
+    OUTPUT_VARIABLE output
+    RESULT_VARIABLE result
+    WORKING_DIRECTORY "${_TEST_WORKING_DIR}"
+  )
+  if(NOT ${result} EQUAL 0)
+    message(FATAL_ERROR
+      "Error running test executable '${_TEST_EXECUTABLE}':\n"
+      "  Result: ${result}\n"
+      "  Output: ${output}\n"
+    )
+  endif()
+
+  # Make sure to escape ; (semicolons) in test names first, because
+  # that'd break the foreach loop for "Parse output" later and create
+  # wrongly splitted and thus failing test cases (false positives)
+  string(REPLACE ";" "\;" output "${output}")
+  string(REPLACE "\n" ";" output "${output}")
+
+  # Prepare reporter
+  if(reporter)
+    set(reporter_arg "--reporter ${reporter}")
+
+    # Run test executable to check whether reporter is available
+    # note that the use of --list-reporters is not the important part,
+    # we only want to check whether the execution succeeds with ${reporter_arg}
+    execute_process(
+      COMMAND ${_TEST_EXECUTOR} "${_TEST_EXECUTABLE}" ${spec} ${reporter_arg} --list-reporters
+      OUTPUT_VARIABLE reporter_check_output
+      RESULT_VARIABLE reporter_check_result
+      WORKING_DIRECTORY "${_TEST_WORKING_DIR}"
+    )
+    if(${reporter_check_result} EQUAL 255)
+      message(FATAL_ERROR
+        "\"${reporter}\" is not a valid reporter!\n"
+      )
+    elseif(NOT ${reporter_check_result} EQUAL 0)
+      message(FATAL_ERROR
+        "Error running test executable '${_TEST_EXECUTABLE}':\n"
+        "  Result: ${reporter_check_result}\n"
+        "  Output: ${reporter_check_output}\n"
+      )
+    endif()
+  endif()
+
+  # Prepare output dir
+  if(output_dir AND NOT IS_ABSOLUTE ${output_dir})
+    set(output_dir "${_TEST_WORKING_DIR}/${output_dir}")
+    if(NOT EXISTS ${output_dir})
+      file(MAKE_DIRECTORY ${output_dir})
+    endif()
+  endif()
+
+  if(dl_paths)
+    foreach(path ${dl_paths})
+      cmake_path(NATIVE_PATH path native_path)
+      list(PREPEND environment_modifications "${dl_paths_variable_name}=path_list_prepend:${native_path}")
+    endforeach()
+  endif()
+
+  if(APPLE AND dl_framework_paths)
+    foreach(path ${dl_framework_paths})
+      cmake_path(NATIVE_PATH path native_path)
+      list(PREPEND environment_modifications "DYLD_FRAMEWORK_PATH=path_list_prepend:${native_path}")
+    endforeach()
+  endif()
+
+  # Parse output
+  foreach(line ${output})
+    set(test "${line}")
+    # Escape characters in test case names that would be parsed by Catch2
+    # Note that the \ escaping must happen FIRST! Do not change the order.
+    set(test_name "${test}")
+    foreach(char \\ , [ ])
+      string(REPLACE ${char} "\\${char}" test_name "${test_name}")
+    endforeach(char)
+    # ...add output dir
+    if(output_dir)
+      string(REGEX REPLACE "[^A-Za-z0-9_]" "_" test_name_clean "${test_name}")
+      set(output_dir_arg "--out ${output_dir}/${output_prefix}${test_name_clean}${output_suffix}")
+    endif()
+
+    # ...and add to script
+    add_command(add_test
+      "${prefix}${test}${suffix}"
+      ${_TEST_EXECUTOR}
+      "${_TEST_EXECUTABLE}"
+      "${test_name}"
+      ${extra_args}
+      "${reporter_arg}"
+      "${output_dir_arg}"
+    )
+    add_command(set_tests_properties
+      "${prefix}${test}${suffix}"
+      PROPERTIES
+      WORKING_DIRECTORY "${_TEST_WORKING_DIR}"
+      ${properties}
+    )
+
+    if(environment_modifications)
+      add_command(set_tests_properties
+        "${prefix}${test}${suffix}"
+        PROPERTIES
+        ENVIRONMENT_MODIFICATION "${environment_modifications}")
+    endif()
+
+    list(APPEND tests "${prefix}${test}${suffix}")
   endforeach()
+
+  # Create a list of all discovered tests, which users may use to e.g. set
+  # properties on the tests
+  add_command(set ${_TEST_LIST} ${tests})
+
+  # Write CTest script
+  file(WRITE "${_CTEST_FILE}" "${script}")
+endfunction()
+
+if(CMAKE_SCRIPT_MODE_FILE)
+  catch_discover_tests_impl(
+    TEST_EXECUTABLE ${TEST_EXECUTABLE}
+    TEST_EXECUTOR ${TEST_EXECUTOR}
+    TEST_WORKING_DIR ${TEST_WORKING_DIR}
+    TEST_SPEC ${TEST_SPEC}
+    TEST_EXTRA_ARGS ${TEST_EXTRA_ARGS}
+    TEST_PROPERTIES ${TEST_PROPERTIES}
+    TEST_PREFIX ${TEST_PREFIX}
+    TEST_SUFFIX ${TEST_SUFFIX}
+    TEST_LIST ${TEST_LIST}
+    TEST_REPORTER ${TEST_REPORTER}
+    TEST_OUTPUT_DIR ${TEST_OUTPUT_DIR}
+    TEST_OUTPUT_PREFIX ${TEST_OUTPUT_PREFIX}
+    TEST_OUTPUT_SUFFIX ${TEST_OUTPUT_SUFFIX}
+    TEST_DL_PATHS ${TEST_DL_PATHS}
+    TEST_DL_FRAMEWORK_PATHS ${TEST_DL_FRAMEWORK_PATHS}
+    CTEST_FILE ${CTEST_FILE}
+  )
 endif()
-
-# Parse output
-foreach(line ${output})
-  set(test ${line})
-  # Escape characters in test case names that would be parsed by Catch2
-  set(test_name ${test})
-  foreach(char , [ ])
-    string(REPLACE ${char} "\\${char}" test_name ${test_name})
-  endforeach(char)
-  # ...add output dir
-  if(output_dir)
-    string(REGEX REPLACE "[^A-Za-z0-9_]" "_" test_name_clean ${test_name})
-    set(output_dir_arg "--out ${output_dir}/${output_prefix}${test_name_clean}${output_suffix}")
-  endif()
-  
-  # ...and add to script
-  add_command(add_test
-    "${prefix}${test}${suffix}"
-    ${TEST_EXECUTOR}
-    "${TEST_EXECUTABLE}"
-    "${test_name}"
-    ${extra_args}
-    "${reporter_arg}"
-    "${output_dir_arg}"
-  )
-  add_command(set_tests_properties
-    "${prefix}${test}${suffix}"
-    PROPERTIES
-    WORKING_DIRECTORY "${TEST_WORKING_DIR}"
-    ${properties}
-  )
-
-   if(environment_modifications)
-     add_command(set_tests_properties
-       "${prefix}${test}${suffix}"
-       PROPERTIES
-       ENVIRONMENT_MODIFICATION "${environment_modifications}")
-   endif()
-
-  list(APPEND tests "${prefix}${test}${suffix}")
-endforeach()
-
-# Create a list of all discovered tests, which users may use to e.g. set
-# properties on the tests
-add_command(set ${TEST_LIST} ${tests})
-
-# Write CTest script
-file(WRITE "${CTEST_FILE}" "${script}")

extras/CatchShardTests.cmake

@@ -46,7 +46,7 @@ function(catch_add_sharded_tests TARGET)
     APPEND PROPERTY TEST_INCLUDE_FILES "${ctest_include_file}"
   )
 
-  set(shard_impl_script_file "${CMAKE_CURRENT_LIST_DIR}/CatchShardTestsImpl.cmake")
+  set(shard_impl_script_file "${_CATCH_DISCOVER_SHARD_TESTS_IMPL_SCRIPT}")
 
   add_custom_command(
     TARGET ${TARGET} POST_BUILD
@@ -64,3 +64,11 @@ function(catch_add_sharded_tests TARGET)
 
 
 endfunction()
+
+
+###############################################################################
+
+set(_CATCH_DISCOVER_SHARD_TESTS_IMPL_SCRIPT
+    ${CMAKE_CURRENT_LIST_DIR}/CatchShardTestsImpl.cmake
+  CACHE INTERNAL "Catch2 full path to CatchShardTestsImpl.cmake helper file"
+)

extras/ParseAndAddCatchTests.cmake

@@ -187,7 +187,7 @@ function(ParseAndAddCatchTests_ParseFile SourceFile TestTarget)
             if(result)
                 set(HiddenTagFound ON)
                 break()
-            endif(result)
+            endif()
         endforeach(label)
         if(PARSE_CATCH_TESTS_NO_HIDDEN_TESTS AND ${HiddenTagFound} AND ${CMAKE_VERSION} VERSION_LESS "3.9")
             ParseAndAddCatchTests_PrintDebugMessage("Skipping test \"${CTestName}\" as it has [!hide], [.] or [.foo] label")

fuzzing/NullOStream.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 #include "NullOStream.h"
 
 void NullOStream::avoidOutOfLineVirtualCompilerWarning()

fuzzing/NullOStream.h

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 #pragma once
 
 #include <ostream>

fuzzing/fuzz_TestSpecParser.cpp

@@ -1,4 +1,10 @@
-//License: Boost 1.0
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
 //By Paul Dreik 2020
 
 #include <catch2/internal/catch_test_spec_parser.hpp>

fuzzing/fuzz_XmlWriter.cpp

@@ -1,4 +1,10 @@
-//License: Boost 1.0
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
 //By Paul Dreik 2020
 
 #include <catch2/internal/catch_xmlwriter.hpp>

fuzzing/fuzz_textflow.cpp

@@ -1,4 +1,10 @@
-//License: Boost 1.0
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
 //By Paul Dreik 2020
 
 #include <catch2/internal/catch_textflow.hpp>

meson.build

@@ -8,10 +8,12 @@
 project(
   'catch2',
   'cpp',
-  version: '3.3.2', # CML version placeholder, don't delete
+  version: '3.7.0', # CML version placeholder, don't delete
   license: 'BSL-1.0',
-  meson_version: '>=0.50.0',
+  meson_version: '>=0.54.1',
 )
 
 subdir('src/catch2')
-subdir('tests')
+if get_option('tests')
+  subdir('tests')
+endif

meson_options.txt

@@ -0,0 +1 @@
+option('tests', type: 'boolean', value: true, description: 'Build the unit tests')

src/CMakeLists.txt

@@ -21,6 +21,8 @@ set(BENCHMARK_HEADERS
   ${SOURCES_DIR}/benchmark/catch_sample_analysis.hpp
   ${SOURCES_DIR}/benchmark/detail/catch_analyse.hpp
   ${SOURCES_DIR}/benchmark/detail/catch_benchmark_function.hpp
+  ${SOURCES_DIR}/benchmark/detail/catch_benchmark_stats.hpp
+  ${SOURCES_DIR}/benchmark/detail/catch_benchmark_stats_fwd.hpp
   ${SOURCES_DIR}/benchmark/detail/catch_complete_invoke.hpp
   ${SOURCES_DIR}/benchmark/detail/catch_estimate_clock.hpp
   ${SOURCES_DIR}/benchmark/detail/catch_measure.hpp
@@ -31,6 +33,7 @@ set(BENCHMARK_HEADERS
 )
 set(BENCHMARK_SOURCES
   ${SOURCES_DIR}/benchmark/catch_chronometer.cpp
+  ${SOURCES_DIR}/benchmark/detail/catch_analyse.cpp
   ${SOURCES_DIR}/benchmark/detail/catch_benchmark_function.cpp
   ${SOURCES_DIR}/benchmark/detail/catch_run_for_at_least.cpp
   ${SOURCES_DIR}/benchmark/detail/catch_stats.cpp
@@ -45,6 +48,7 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/catch_approx.hpp
   ${SOURCES_DIR}/catch_assertion_info.hpp
   ${SOURCES_DIR}/catch_assertion_result.hpp
+  ${SOURCES_DIR}/catch_case_sensitive.hpp
   ${SOURCES_DIR}/catch_config.hpp
   ${SOURCES_DIR}/catch_get_random_seed.hpp
   ${SOURCES_DIR}/catch_message.hpp
@@ -64,13 +68,13 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/catch_version_macros.hpp
   ${SOURCES_DIR}/internal/catch_assertion_handler.hpp
   ${SOURCES_DIR}/internal/catch_case_insensitive_comparisons.hpp
-  ${SOURCES_DIR}/internal/catch_case_sensitive.hpp
   ${SOURCES_DIR}/internal/catch_clara.hpp
   ${SOURCES_DIR}/internal/catch_commandline.hpp
   ${SOURCES_DIR}/internal/catch_compare_traits.hpp
   ${SOURCES_DIR}/internal/catch_compiler_capabilities.hpp
   ${SOURCES_DIR}/internal/catch_config_android_logwrite.hpp
   ${SOURCES_DIR}/internal/catch_config_counter.hpp
+  ${SOURCES_DIR}/internal/catch_config_static_analysis_support.hpp
   ${SOURCES_DIR}/internal/catch_config_uncaught_exceptions.hpp
   ${SOURCES_DIR}/internal/catch_config_wchar.hpp
   ${SOURCES_DIR}/internal/catch_console_colour.hpp
@@ -89,6 +93,7 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/internal/catch_getenv.hpp
   ${SOURCES_DIR}/internal/catch_istream.hpp
   ${SOURCES_DIR}/internal/catch_is_permutation.hpp
+  ${SOURCES_DIR}/internal/catch_jsonwriter.hpp
   ${SOURCES_DIR}/internal/catch_lazy_expr.hpp
   ${SOURCES_DIR}/internal/catch_leak_detector.hpp
   ${SOURCES_DIR}/internal/catch_list.hpp
@@ -104,6 +109,8 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/internal/catch_polyfills.hpp
   ${SOURCES_DIR}/internal/catch_preprocessor.hpp
   ${SOURCES_DIR}/internal/catch_preprocessor_remove_parens.hpp
+  ${SOURCES_DIR}/internal/catch_random_floating_point_helpers.hpp
+  ${SOURCES_DIR}/internal/catch_random_integer_helpers.hpp
   ${SOURCES_DIR}/internal/catch_random_number_generator.hpp
   ${SOURCES_DIR}/internal/catch_random_seed_generation.hpp
   ${SOURCES_DIR}/internal/catch_reporter_registry.hpp
@@ -128,10 +135,13 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/internal/catch_test_failure_exception.hpp
   ${SOURCES_DIR}/internal/catch_test_macro_impl.hpp
   ${SOURCES_DIR}/internal/catch_test_registry.hpp
+  ${SOURCES_DIR}/internal/catch_test_run_info.hpp
   ${SOURCES_DIR}/internal/catch_test_spec_parser.hpp
   ${SOURCES_DIR}/internal/catch_textflow.hpp
   ${SOURCES_DIR}/internal/catch_to_string.hpp
   ${SOURCES_DIR}/internal/catch_uncaught_exceptions.hpp
+  ${SOURCES_DIR}/internal/catch_uniform_floating_point_distribution.hpp
+  ${SOURCES_DIR}/internal/catch_uniform_integer_distribution.hpp
   ${SOURCES_DIR}/internal/catch_unique_name.hpp
   ${SOURCES_DIR}/internal/catch_unique_ptr.hpp
   ${SOURCES_DIR}/internal/catch_void_type.hpp
@@ -153,6 +163,7 @@ set(IMPL_SOURCES
   ${SOURCES_DIR}/catch_timer.cpp
   ${SOURCES_DIR}/catch_tostring.cpp
   ${SOURCES_DIR}/catch_totals.cpp
+  ${SOURCES_DIR}/catch_translate_exception.cpp
   ${SOURCES_DIR}/catch_version.cpp
   ${SOURCES_DIR}/internal/catch_assertion_handler.cpp
   ${SOURCES_DIR}/internal/catch_case_insensitive_comparisons.cpp
@@ -171,6 +182,7 @@ set(IMPL_SOURCES
   ${SOURCES_DIR}/internal/catch_floating_point_helpers.cpp
   ${SOURCES_DIR}/internal/catch_getenv.cpp
   ${SOURCES_DIR}/internal/catch_istream.cpp
+  ${SOURCES_DIR}/internal/catch_jsonwriter.cpp
   ${SOURCES_DIR}/internal/catch_lazy_expr.cpp
   ${SOURCES_DIR}/internal/catch_leak_detector.cpp
   ${SOURCES_DIR}/internal/catch_list.cpp
@@ -216,8 +228,8 @@ set(INTERFACE_HEADERS
   ${SOURCES_DIR}/interfaces/catch_interfaces_registry_hub.hpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_reporter.hpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_reporter_factory.hpp
-  ${SOURCES_DIR}/interfaces/catch_interfaces_reporter_registry.hpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_tag_alias_registry.hpp
+  ${SOURCES_DIR}/interfaces/catch_interfaces_test_invoker.hpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_testcase.hpp
 )
 set(INTERFACE_SOURCES
@@ -228,7 +240,6 @@ set(INTERFACE_SOURCES
   ${SOURCES_DIR}/interfaces/catch_interfaces_registry_hub.cpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_reporter.cpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_reporter_factory.cpp
-  ${SOURCES_DIR}/interfaces/catch_interfaces_reporter_registry.cpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_testcase.cpp
 )
 set(INTERFACE_FILES ${INTERFACE_HEADERS} ${INTERFACE_SOURCES})
@@ -284,6 +295,7 @@ set(REPORTER_HEADERS
   ${SOURCES_DIR}/reporters/catch_reporter_cumulative_base.hpp
   ${SOURCES_DIR}/reporters/catch_reporter_event_listener.hpp
   ${SOURCES_DIR}/reporters/catch_reporter_helpers.hpp
+  ${SOURCES_DIR}/reporters/catch_reporter_json.hpp
   ${SOURCES_DIR}/reporters/catch_reporter_junit.hpp
   ${SOURCES_DIR}/reporters/catch_reporter_multi.hpp
   ${SOURCES_DIR}/reporters/catch_reporter_registrars.hpp
@@ -302,6 +314,7 @@ set(REPORTER_SOURCES
   ${SOURCES_DIR}/reporters/catch_reporter_cumulative_base.cpp
   ${SOURCES_DIR}/reporters/catch_reporter_event_listener.cpp
   ${SOURCES_DIR}/reporters/catch_reporter_helpers.cpp
+  ${SOURCES_DIR}/reporters/catch_reporter_json.cpp
   ${SOURCES_DIR}/reporters/catch_reporter_junit.cpp
   ${SOURCES_DIR}/reporters/catch_reporter_multi.cpp
   ${SOURCES_DIR}/reporters/catch_reporter_registrars.cpp
@@ -335,11 +348,13 @@ source_group("generated headers"
 )
 
 add_library(Catch2 ${ALL_FILES})
-add_build_reproducibility_settings(Catch2)
+if (CATCH_ENABLE_REPRODUCIBLE_BUILD)
+    add_build_reproducibility_settings(Catch2)
+endif()
 add_library(Catch2::Catch2 ALIAS Catch2)
 
 if (ANDROID)
-    target_link_libraries(Catch2 INTERFACE log)
+    target_link_libraries(Catch2 PRIVATE log)
 endif()
 
 set_target_properties(Catch2 PROPERTIES
@@ -347,29 +362,10 @@ set_target_properties(Catch2 PROPERTIES
                                 VERSION ${PROJECT_VERSION}
                               SOVERSION ${PROJECT_VERSION})
 
-# depend on bunch of C++11 and C++14 features to have C++14 enabled by default
+# require C++14
 target_compile_features(Catch2
   PUBLIC
-    cxx_alignas
-    cxx_alignof
-    cxx_attributes
-    cxx_auto_type
-    cxx_constexpr
-    cxx_defaulted_functions
-    cxx_deleted_functions
-    cxx_final
-    cxx_lambdas
-    cxx_noexcept
-    cxx_override
-    cxx_range_for
-    cxx_rvalue_references
-    cxx_static_assert
-    cxx_strong_enums
-    cxx_trailing_return_types
-    cxx_unicode_literals
-    cxx_user_literals
-    cxx_variable_templates
-    cxx_variadic_macros
+    cxx_std_14
 )
 
 configure_file(
@@ -388,7 +384,9 @@ target_include_directories(Catch2
 add_library(Catch2WithMain
     ${SOURCES_DIR}/internal/catch_main.cpp
 )
-add_build_reproducibility_settings(Catch2WithMain)
+if (CATCH_ENABLE_REPRODUCIBLE_BUILD)
+    add_build_reproducibility_settings(Catch2WithMain)
+endif()
 add_library(Catch2::Catch2WithMain ALIAS Catch2WithMain)
 target_link_libraries(Catch2WithMain PUBLIC Catch2)
 set_target_properties(Catch2WithMain
@@ -458,26 +456,7 @@ if (CATCH_BUILD_EXAMPLES OR CATCH_BUILD_EXTRA_TESTS)
     )
     target_compile_features(Catch2_buildall_interface
       INTERFACE
-        cxx_alignas
-        cxx_alignof
-        cxx_attributes
-        cxx_auto_type
-        cxx_constexpr
-        cxx_defaulted_functions
-        cxx_deleted_functions
-        cxx_final
-        cxx_lambdas
-        cxx_noexcept
-        cxx_override
-        cxx_range_for
-        cxx_rvalue_references
-        cxx_static_assert
-        cxx_strong_enums
-        cxx_trailing_return_types
-        cxx_unicode_literals
-        cxx_user_literals
-        cxx_variable_templates
-        cxx_variadic_macros
+        cxx_std_14
     )
 endif()
 

src/catch2/benchmark/catch_benchmark.hpp

@@ -10,26 +10,28 @@
 #ifndef CATCH_BENCHMARK_HPP_INCLUDED
 #define CATCH_BENCHMARK_HPP_INCLUDED
 
-#include <catch2/interfaces/catch_interfaces_config.hpp>
+#include <catch2/catch_user_config.hpp>
 #include <catch2/internal/catch_compiler_capabilities.hpp>
 #include <catch2/internal/catch_context.hpp>
-#include <catch2/interfaces/catch_interfaces_reporter.hpp>
-#include <catch2/internal/catch_unique_name.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
-#include <catch2/benchmark/catch_chronometer.hpp>
+#include <catch2/internal/catch_test_failure_exception.hpp>
+#include <catch2/internal/catch_unique_name.hpp>
+#include <catch2/interfaces/catch_interfaces_capture.hpp>
+#include <catch2/interfaces/catch_interfaces_config.hpp>
+#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
+#include <catch2/benchmark/detail/catch_benchmark_stats.hpp>
 #include <catch2/benchmark/catch_clock.hpp>
 #include <catch2/benchmark/catch_environment.hpp>
 #include <catch2/benchmark/catch_execution_plan.hpp>
 #include <catch2/benchmark/detail/catch_estimate_clock.hpp>
-#include <catch2/benchmark/detail/catch_complete_invoke.hpp>
 #include <catch2/benchmark/detail/catch_analyse.hpp>
 #include <catch2/benchmark/detail/catch_benchmark_function.hpp>
 #include <catch2/benchmark/detail/catch_run_for_at_least.hpp>
 
 #include <algorithm>
-#include <functional>
+#include <chrono>
+#include <exception>
 #include <string>
-#include <vector>
 #include <cmath>
 
 namespace Catch {
@@ -43,16 +45,18 @@ namespace Catch {
                 : fun(CATCH_MOVE(func)), name(CATCH_MOVE(benchmarkName)) {}
 
             template <typename Clock>
-            ExecutionPlan<FloatDuration<Clock>> prepare(const IConfig &cfg, Environment<FloatDuration<Clock>> env) const {
+            ExecutionPlan prepare(const IConfig &cfg, Environment env) {
                 auto min_time = env.clock_resolution.mean * Detail::minimum_ticks;
                 auto run_time = std::max(min_time, std::chrono::duration_cast<decltype(min_time)>(cfg.benchmarkWarmupTime()));
-                auto&& test = Detail::run_for_at_least<Clock>(std::chrono::duration_cast<ClockDuration<Clock>>(run_time), 1, fun);
+                auto&& test = Detail::run_for_at_least<Clock>(std::chrono::duration_cast<IDuration>(run_time), 1, fun);
                 int new_iters = static_cast<int>(std::ceil(min_time * test.iterations / test.elapsed));
-                return { new_iters, test.elapsed / test.iterations * new_iters * cfg.benchmarkSamples(), fun, std::chrono::duration_cast<FloatDuration<Clock>>(cfg.benchmarkWarmupTime()), Detail::warmup_iterations };
+                return { new_iters, test.elapsed / test.iterations * new_iters * cfg.benchmarkSamples(), CATCH_MOVE(fun), std::chrono::duration_cast<FDuration>(cfg.benchmarkWarmupTime()), Detail::warmup_iterations };
             }
 
             template <typename Clock = default_clock>
             void run() {
+                static_assert( Clock::is_steady,
+                               "Benchmarking clock should be steady" );
                 auto const* cfg = getCurrentContext().getConfig();
 
                 auto env = Detail::measure_environment<Clock>();
@@ -79,10 +83,10 @@ namespace Catch {
                         return plan.template run<Clock>(*cfg, env);
                     });
 
-                    auto analysis = Detail::analyse(*cfg, env, samples.begin(), samples.end());
-                    BenchmarkStats<FloatDuration<Clock>> stats{ CATCH_MOVE(info), CATCH_MOVE(analysis.samples), analysis.mean, analysis.standard_deviation, analysis.outliers, analysis.outlier_variance };
+                    auto analysis = Detail::analyse(*cfg, samples.data(), samples.data() + samples.size());
+                    BenchmarkStats<> stats{ CATCH_MOVE(info), CATCH_MOVE(analysis.samples), analysis.mean, analysis.standard_deviation, analysis.outliers, analysis.outlier_variance };
                     getResultCapture().benchmarkEnded(stats);
-                } CATCH_CATCH_ANON (TestFailureException) {
+                } CATCH_CATCH_ANON (TestFailureException const&) {
                     getResultCapture().benchmarkFailed("Benchmark failed due to failed assertion"_sr);
                 } CATCH_CATCH_ALL{
                     getResultCapture().benchmarkFailed(translateActiveException());

src/catch2/benchmark/catch_benchmark_all.hpp

@@ -33,6 +33,8 @@
 #include <catch2/benchmark/catch_sample_analysis.hpp>
 #include <catch2/benchmark/detail/catch_analyse.hpp>
 #include <catch2/benchmark/detail/catch_benchmark_function.hpp>
+#include <catch2/benchmark/detail/catch_benchmark_stats.hpp>
+#include <catch2/benchmark/detail/catch_benchmark_stats_fwd.hpp>
 #include <catch2/benchmark/detail/catch_complete_invoke.hpp>
 #include <catch2/benchmark/detail/catch_estimate_clock.hpp>
 #include <catch2/benchmark/detail/catch_measure.hpp>

src/catch2/benchmark/catch_chronometer.hpp

@@ -12,7 +12,6 @@
 
 #include <catch2/benchmark/catch_clock.hpp>
 #include <catch2/benchmark/catch_optimizer.hpp>
-#include <catch2/benchmark/detail/catch_complete_invoke.hpp>
 #include <catch2/internal/catch_meta.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
 
@@ -33,7 +32,10 @@ namespace Catch {
                 void start() override { started = Clock::now(); }
                 void finish() override { finished = Clock::now(); }
 
-                ClockDuration<Clock> elapsed() const { return finished - started; }
+                IDuration elapsed() const {
+                    return std::chrono::duration_cast<std::chrono::nanoseconds>(
+                        finished - started );
+                }
 
                 TimePoint<Clock> started;
                 TimePoint<Clock> finished;

src/catch2/benchmark/catch_clock.hpp

@@ -11,28 +11,16 @@
 #define CATCH_CLOCK_HPP_INCLUDED
 
 #include <chrono>
-#include <ratio>
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Clock>
-        using ClockDuration = typename Clock::duration;
-        template <typename Clock>
-        using FloatDuration = std::chrono::duration<double, typename Clock::period>;
+        using IDuration = std::chrono::nanoseconds;
+        using FDuration = std::chrono::duration<double, std::nano>;
 
         template <typename Clock>
         using TimePoint = typename Clock::time_point;
 
         using default_clock = std::chrono::steady_clock;
-
-        template <typename Clock>
-        struct now {
-            TimePoint<Clock> operator()() const {
-                return Clock::now();
-            }
-        };
-
-        using fp_seconds = std::chrono::duration<double, std::ratio<1>>;
     } // namespace Benchmark
 } // namespace Catch
 

src/catch2/benchmark/catch_environment.hpp

@@ -15,21 +15,13 @@
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Duration>
         struct EnvironmentEstimate {
-            Duration mean;
+            FDuration mean;
             OutlierClassification outliers;
-
-            template <typename Duration2>
-            operator EnvironmentEstimate<Duration2>() const {
-                return { mean, outliers };
-            }
         };
-        template <typename Clock>
         struct Environment {
-            using clock_type = Clock;
-            EnvironmentEstimate<FloatDuration<Clock>> clock_resolution;
-            EnvironmentEstimate<FloatDuration<Clock>> clock_cost;
+            EnvironmentEstimate clock_resolution;
+            EnvironmentEstimate clock_cost;
         };
     } // namespace Benchmark
 } // namespace Catch

src/catch2/benchmark/catch_estimate.hpp

@@ -12,17 +12,12 @@
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Duration>
+        template <typename Type>
         struct Estimate {
-            Duration point;
-            Duration lower_bound;
-            Duration upper_bound;
+            Type point;
+            Type lower_bound;
+            Type upper_bound;
             double confidence_interval;
-
-            template <typename Duration2>
-            operator Estimate<Duration2>() const {
-                return { point, lower_bound, upper_bound, confidence_interval };
-            }
         };
     } // namespace Benchmark
 } // namespace Catch

src/catch2/benchmark/catch_execution_plan.hpp

@@ -17,38 +17,38 @@
 #include <catch2/benchmark/detail/catch_repeat.hpp>
 #include <catch2/benchmark/detail/catch_run_for_at_least.hpp>
 
-#include <algorithm>
-#include <iterator>
+#include <vector>
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Duration>
         struct ExecutionPlan {
             int iterations_per_sample;
-            Duration estimated_duration;
+            FDuration estimated_duration;
             Detail::BenchmarkFunction benchmark;
-            Duration warmup_time;
+            FDuration warmup_time;
             int warmup_iterations;
 
-            template <typename Duration2>
-            operator ExecutionPlan<Duration2>() const {
-                return { iterations_per_sample, estimated_duration, benchmark, warmup_time, warmup_iterations };
-            }
-
             template <typename Clock>
-            std::vector<FloatDuration<Clock>> run(const IConfig &cfg, Environment<FloatDuration<Clock>> env) const {
+            std::vector<FDuration> run(const IConfig &cfg, Environment env) const {
                 // warmup a bit
-                Detail::run_for_at_least<Clock>(std::chrono::duration_cast<ClockDuration<Clock>>(warmup_time), warmup_iterations, Detail::repeat(now<Clock>{}));
+                Detail::run_for_at_least<Clock>(
+                    std::chrono::duration_cast<IDuration>( warmup_time ),
+                    warmup_iterations,
+                    Detail::repeat( []() { return Clock::now(); } )
+                );
 
-                std::vector<FloatDuration<Clock>> times;
-                times.reserve(cfg.benchmarkSamples());
-                std::generate_n(std::back_inserter(times), cfg.benchmarkSamples(), [this, env] {
+                std::vector<FDuration> times;
+                const auto num_samples = cfg.benchmarkSamples();
+                times.reserve( num_samples );
+                for ( size_t i = 0; i < num_samples; ++i ) {
                     Detail::ChronometerModel<Clock> model;
-                    this->benchmark(Chronometer(model, iterations_per_sample));
+                    this->benchmark( Chronometer( model, iterations_per_sample ) );
                     auto sample_time = model.elapsed() - env.clock_cost.mean;
-                    if (sample_time < FloatDuration<Clock>::zero()) sample_time = FloatDuration<Clock>::zero();
-                    return sample_time / iterations_per_sample;
-                });
+                    if ( sample_time < FDuration::zero() ) {
+                        sample_time = FDuration::zero();
+                    }
+                    times.push_back(sample_time / iterations_per_sample);
+                }
                 return times;
             }
         };

src/catch2/benchmark/catch_optimizer.hpp

@@ -10,7 +10,7 @@
 #ifndef CATCH_OPTIMIZER_HPP_INCLUDED
 #define CATCH_OPTIMIZER_HPP_INCLUDED
 
-#if defined(_MSC_VER)
+#if defined(_MSC_VER) || defined(__IAR_SYSTEMS_ICC__)
 #   include <atomic> // atomic_thread_fence
 #endif
 
@@ -32,16 +32,23 @@ namespace Catch {
         namespace Detail {
             inline void optimizer_barrier() { keep_memory(); }
         } // namespace Detail
-#elif defined(_MSC_VER)
+#elif defined(_MSC_VER) || defined(__IAR_SYSTEMS_ICC__)
 
+#if defined(_MSVC_VER)
 #pragma optimize("", off)
+#elif defined(__IAR_SYSTEMS_ICC__)
+// For IAR the pragma only affects the following function
+#pragma optimize=disable
+#endif
         template <typename T>
         inline void keep_memory(T* p) {
             // thanks @milleniumbug
             *reinterpret_cast<char volatile*>(p) = *reinterpret_cast<char const volatile*>(p);
         }
         // TODO equivalent keep_memory()
+#if defined(_MSVC_VER)
 #pragma optimize("", on)
+#endif
 
         namespace Detail {
             inline void optimizer_barrier() {
@@ -63,7 +70,7 @@ namespace Catch {
 
         template <typename Fn, typename... Args>
         inline auto invoke_deoptimized(Fn&& fn, Args&&... args) -> std::enable_if_t<std::is_same<void, decltype(fn(args...))>::value> {
-            CATCH_FORWARD(fn) (CATCH_FORWARD(args)...);
+            CATCH_FORWARD((fn)) (CATCH_FORWARD(args)...);
         }
     } // namespace Benchmark
 } // namespace Catch

src/catch2/benchmark/catch_sample_analysis.hpp

@@ -10,38 +10,20 @@
 #ifndef CATCH_SAMPLE_ANALYSIS_HPP_INCLUDED
 #define CATCH_SAMPLE_ANALYSIS_HPP_INCLUDED
 
-#include <catch2/benchmark/catch_clock.hpp>
 #include <catch2/benchmark/catch_estimate.hpp>
 #include <catch2/benchmark/catch_outlier_classification.hpp>
-#include <catch2/internal/catch_move_and_forward.hpp>
+#include <catch2/benchmark/catch_clock.hpp>
 
-#include <algorithm>
 #include <vector>
-#include <iterator>
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Duration>
         struct SampleAnalysis {
-            std::vector<Duration> samples;
-            Estimate<Duration> mean;
-            Estimate<Duration> standard_deviation;
+            std::vector<FDuration> samples;
+            Estimate<FDuration> mean;
+            Estimate<FDuration> standard_deviation;
             OutlierClassification outliers;
             double outlier_variance;
-
-            template <typename Duration2>
-            operator SampleAnalysis<Duration2>() const {
-                std::vector<Duration2> samples2;
-                samples2.reserve(samples.size());
-                std::transform(samples.begin(), samples.end(), std::back_inserter(samples2), [](Duration d) { return Duration2(d); });
-                return {
-                    CATCH_MOVE(samples2),
-                    mean,
-                    standard_deviation,
-                    outliers,
-                    outlier_variance,
-                };
-            }
         };
     } // namespace Benchmark
 } // namespace Catch

src/catch2/benchmark/detail/catch_analyse.cpp

@@ -0,0 +1,85 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+// Adapted from donated nonius code.
+
+#include <catch2/benchmark/detail/catch_analyse.hpp>
+#include <catch2/benchmark/catch_clock.hpp>
+#include <catch2/benchmark/catch_sample_analysis.hpp>
+#include <catch2/benchmark/detail/catch_stats.hpp>
+#include <catch2/interfaces/catch_interfaces_config.hpp>
+#include <catch2/internal/catch_move_and_forward.hpp>
+
+#include <vector>
+
+namespace Catch {
+    namespace Benchmark {
+        namespace Detail {
+            SampleAnalysis analyse(const IConfig &cfg, FDuration* first, FDuration* last) {
+                if (!cfg.benchmarkNoAnalysis()) {
+                    std::vector<double> samples;
+                    samples.reserve(static_cast<size_t>(last - first));
+                    for (auto current = first; current != last; ++current) {
+                        samples.push_back( current->count() );
+                    }
+
+                    auto analysis = Catch::Benchmark::Detail::analyse_samples(
+                        cfg.benchmarkConfidenceInterval(),
+                        cfg.benchmarkResamples(),
+                        samples.data(),
+                        samples.data() + samples.size() );
+                    auto outliers = Catch::Benchmark::Detail::classify_outliers(
+                        samples.data(), samples.data() + samples.size() );
+
+                    auto wrap_estimate = [](Estimate<double> e) {
+                        return Estimate<FDuration> {
+                            FDuration(e.point),
+                                FDuration(e.lower_bound),
+                                FDuration(e.upper_bound),
+                                e.confidence_interval,
+                        };
+                    };
+                    std::vector<FDuration> samples2;
+                    samples2.reserve(samples.size());
+                    for (auto s : samples) {
+                        samples2.push_back( FDuration( s ) );
+                    }
+
+                    return {
+                        CATCH_MOVE(samples2),
+                        wrap_estimate(analysis.mean),
+                        wrap_estimate(analysis.standard_deviation),
+                        outliers,
+                        analysis.outlier_variance,
+                    };
+                } else {
+                    std::vector<FDuration> samples;
+                    samples.reserve(static_cast<size_t>(last - first));
+
+                    FDuration mean = FDuration(0);
+                    int i = 0;
+                    for (auto it = first; it < last; ++it, ++i) {
+                        samples.push_back(*it);
+                        mean += *it;
+                    }
+                    mean /= i;
+
+                    return SampleAnalysis{
+                        CATCH_MOVE(samples),
+                        Estimate<FDuration>{ mean, mean, mean, 0.0 },
+                        Estimate<FDuration>{ FDuration( 0 ),
+                                             FDuration( 0 ),
+                                             FDuration( 0 ),
+                                             0.0 },
+                        OutlierClassification{},
+                        0.0
+                    };
+                }
+            }
+        } // namespace Detail
+    } // namespace Benchmark
+} // namespace Catch

src/catch2/benchmark/detail/catch_analyse.hpp

@@ -11,68 +11,15 @@
 #define CATCH_ANALYSE_HPP_INCLUDED
 
 #include <catch2/benchmark/catch_clock.hpp>
-#include <catch2/benchmark/catch_environment.hpp>
 #include <catch2/benchmark/catch_sample_analysis.hpp>
-#include <catch2/benchmark/detail/catch_stats.hpp>
-#include <catch2/interfaces/catch_interfaces_config.hpp>
-#include <catch2/internal/catch_move_and_forward.hpp>
 
-#include <algorithm>
-#include <iterator>
-#include <vector>
 
 namespace Catch {
+    class IConfig;
+
     namespace Benchmark {
         namespace Detail {
-            template <typename Duration, typename Iterator>
-            SampleAnalysis<Duration> analyse(const IConfig &cfg, Environment<Duration>, Iterator first, Iterator last) {
-                if (!cfg.benchmarkNoAnalysis()) {
-                    std::vector<double> samples;
-                    samples.reserve(static_cast<size_t>(last - first));
-                    std::transform(first, last, std::back_inserter(samples), [](Duration d) { return d.count(); });
-
-                    auto analysis = Catch::Benchmark::Detail::analyse_samples(cfg.benchmarkConfidenceInterval(), cfg.benchmarkResamples(), samples.begin(), samples.end());
-                    auto outliers = Catch::Benchmark::Detail::classify_outliers(samples.begin(), samples.end());
-
-                    auto wrap_estimate = [](Estimate<double> e) {
-                        return Estimate<Duration> {
-                            Duration(e.point),
-                                Duration(e.lower_bound),
-                                Duration(e.upper_bound),
-                                e.confidence_interval,
-                        };
-                    };
-                    std::vector<Duration> samples2;
-                    samples2.reserve(samples.size());
-                    std::transform(samples.begin(), samples.end(), std::back_inserter(samples2), [](double d) { return Duration(d); });
-                    return {
-                        CATCH_MOVE(samples2),
-                        wrap_estimate(analysis.mean),
-                        wrap_estimate(analysis.standard_deviation),
-                        outliers,
-                        analysis.outlier_variance,
-                    };
-                } else {
-                    std::vector<Duration> samples;
-                    samples.reserve(static_cast<size_t>(last - first));
-
-                    Duration mean = Duration(0);
-                    int i = 0;
-                    for (auto it = first; it < last; ++it, ++i) {
-                        samples.push_back(Duration(*it));
-                        mean += Duration(*it);
-                    }
-                    mean /= i;
-
-                    return {
-                        CATCH_MOVE(samples),
-                        Estimate<Duration>{mean, mean, mean, 0.0},
-                        Estimate<Duration>{Duration(0), Duration(0), Duration(0), 0.0},
-                        OutlierClassification{},
-                        0.0
-                    };
-                }
-            }
+            SampleAnalysis analyse(const IConfig &cfg, FDuration* first, FDuration* last);
         } // namespace Detail
     } // namespace Benchmark
 } // namespace Catch

src/catch2/benchmark/detail/catch_benchmark_function.cpp

@@ -11,7 +11,13 @@
 namespace Catch {
     namespace Benchmark {
         namespace Detail {
+            struct do_nothing {
+                void operator()() const {}
+            };
+
             BenchmarkFunction::callable::~callable() = default;
+            BenchmarkFunction::BenchmarkFunction():
+                f( new model<do_nothing>{ {} } ){}
         } // namespace Detail
     } // namespace Benchmark
 } // namespace Catch

src/catch2/benchmark/detail/catch_benchmark_function.hpp

@@ -11,7 +11,6 @@
 #define CATCH_BENCHMARK_FUNCTION_HPP_INCLUDED
 
 #include <catch2/benchmark/catch_chronometer.hpp>
-#include <catch2/benchmark/detail/catch_complete_invoke.hpp>
 #include <catch2/internal/catch_meta.hpp>
 #include <catch2/internal/catch_unique_ptr.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
@@ -36,22 +35,17 @@ namespace Catch {
             private:
                 struct callable {
                     virtual void call(Chronometer meter) const = 0;
-                    virtual Catch::Detail::unique_ptr<callable> clone() const = 0;
                     virtual ~callable(); // = default;
 
                     callable() = default;
-                    callable(callable const&) = default;
-                    callable& operator=(callable const&) = default;
+                    callable(callable&&) = default;
+                    callable& operator=(callable&&) = default;
                 };
                 template <typename Fun>
                 struct model : public callable {
                     model(Fun&& fun_) : fun(CATCH_MOVE(fun_)) {}
                     model(Fun const& fun_) : fun(fun_) {}
 
-                    Catch::Detail::unique_ptr<callable> clone() const override {
-                        return Catch::Detail::make_unique<model<Fun>>( *this );
-                    }
-
                     void call(Chronometer meter) const override {
                         call(meter, is_callable<Fun(Chronometer)>());
                     }
@@ -65,14 +59,8 @@ namespace Catch {
                     Fun fun;
                 };
 
-                struct do_nothing { void operator()() const {} };
-
-                template <typename T>
-                BenchmarkFunction(model<T>* c) : f(c) {}
-
             public:
-                BenchmarkFunction()
-                    : f(new model<do_nothing>{ {} }) {}
+                BenchmarkFunction();
 
                 template <typename Fun,
                     std::enable_if_t<!is_related<Fun, BenchmarkFunction>::value, int> = 0>
@@ -82,20 +70,12 @@ namespace Catch {
                 BenchmarkFunction( BenchmarkFunction&& that ) noexcept:
                     f( CATCH_MOVE( that.f ) ) {}
 
-                BenchmarkFunction(BenchmarkFunction const& that)
-                    : f(that.f->clone()) {}
-
                 BenchmarkFunction&
                 operator=( BenchmarkFunction&& that ) noexcept {
                     f = CATCH_MOVE( that.f );
                     return *this;
                 }
 
-                BenchmarkFunction& operator=(BenchmarkFunction const& that) {
-                    f = that.f->clone();
-                    return *this;
-                }
-
                 void operator()(Chronometer meter) const { f->call(meter); }
 
             private:

src/catch2/benchmark/detail/catch_benchmark_stats.hpp

@@ -0,0 +1,48 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+#ifndef CATCH_BENCHMARK_STATS_HPP_INCLUDED
+#define CATCH_BENCHMARK_STATS_HPP_INCLUDED
+
+#include <catch2/benchmark/catch_estimate.hpp>
+#include <catch2/benchmark/catch_outlier_classification.hpp>
+// The fwd decl & default specialization needs to be seen by VS2017 before
+// BenchmarkStats itself, or VS2017 will report compilation error.
+#include <catch2/benchmark/detail/catch_benchmark_stats_fwd.hpp>
+
+#include <string>
+#include <vector>
+
+namespace Catch {
+
+    struct BenchmarkInfo {
+        std::string name;
+        double estimatedDuration;
+        int iterations;
+        unsigned int samples;
+        unsigned int resamples;
+        double clockResolution;
+        double clockCost;
+    };
+
+    // We need to keep template parameter for backwards compatibility,
+    // but we also do not want to use the template paraneter.
+    template <class Dummy>
+    struct BenchmarkStats {
+        BenchmarkInfo info;
+
+        std::vector<Benchmark::FDuration> samples;
+        Benchmark::Estimate<Benchmark::FDuration> mean;
+        Benchmark::Estimate<Benchmark::FDuration> standardDeviation;
+        Benchmark::OutlierClassification outliers;
+        double outlierVariance;
+    };
+
+
+} // end namespace Catch
+
+#endif // CATCH_BENCHMARK_STATS_HPP_INCLUDED

src/catch2/benchmark/detail/catch_benchmark_stats_fwd.hpp

@@ -0,0 +1,23 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+#ifndef CATCH_BENCHMARK_STATS_FWD_HPP_INCLUDED
+#define CATCH_BENCHMARK_STATS_FWD_HPP_INCLUDED
+
+#include <catch2/benchmark/catch_clock.hpp>
+
+namespace Catch {
+
+    // We cannot forward declare the type with default template argument
+    // multiple times, so it is split out into a separate header so that
+    // we can prevent multiple declarations in dependees
+    template <typename Duration = Benchmark::FDuration>
+    struct BenchmarkStats;
+
+} // end namespace Catch
+
+#endif // CATCH_BENCHMARK_STATS_FWD_HPP_INCLUDED

src/catch2/benchmark/detail/catch_complete_invoke.hpp

@@ -10,14 +10,9 @@
 #ifndef CATCH_COMPLETE_INVOKE_HPP_INCLUDED
 #define CATCH_COMPLETE_INVOKE_HPP_INCLUDED
 
-#include <catch2/internal/catch_test_failure_exception.hpp>
 #include <catch2/internal/catch_meta.hpp>
-#include <catch2/interfaces/catch_interfaces_capture.hpp>
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
 
-#include <type_traits>
-
 namespace Catch {
     namespace Benchmark {
         namespace Detail {

src/catch2/benchmark/detail/catch_estimate_clock.hpp

@@ -19,7 +19,6 @@
 #include <catch2/internal/catch_unique_ptr.hpp>
 
 #include <algorithm>
-#include <iterator>
 #include <vector>
 #include <cmath>
 
@@ -28,48 +27,53 @@ namespace Catch {
         namespace Detail {
             template <typename Clock>
             std::vector<double> resolution(int k) {
-                std::vector<TimePoint<Clock>> times;
-                times.reserve(static_cast<size_t>(k + 1));
-                std::generate_n(std::back_inserter(times), k + 1, now<Clock>{});
+                const size_t points = static_cast<size_t>( k + 1 );
+                // To avoid overhead from the branch inside vector::push_back,
+                // we allocate them all and then overwrite.
+                std::vector<TimePoint<Clock>> times(points);
+                for ( auto& time : times ) {
+                    time = Clock::now();
+                }
 
                 std::vector<double> deltas;
                 deltas.reserve(static_cast<size_t>(k));
-                std::transform(std::next(times.begin()), times.end(), times.begin(),
-                    std::back_inserter(deltas),
-                    [](TimePoint<Clock> a, TimePoint<Clock> b) { return static_cast<double>((a - b).count()); });
+                for ( size_t idx = 1; idx < points; ++idx ) {
+                    deltas.push_back( static_cast<double>(
+                        ( times[idx] - times[idx - 1] ).count() ) );
+                }
 
                 return deltas;
             }
 
-            const auto warmup_iterations = 10000;
-            const auto warmup_time = std::chrono::milliseconds(100);
-            const auto minimum_ticks = 1000;
-            const auto warmup_seed = 10000;
-            const auto clock_resolution_estimation_time = std::chrono::milliseconds(500);
-            const auto clock_cost_estimation_time_limit = std::chrono::seconds(1);
-            const auto clock_cost_estimation_tick_limit = 100000;
-            const auto clock_cost_estimation_time = std::chrono::milliseconds(10);
-            const auto clock_cost_estimation_iterations = 10000;
+            constexpr auto warmup_iterations = 10000;
+            constexpr auto warmup_time = std::chrono::milliseconds(100);
+            constexpr auto minimum_ticks = 1000;
+            constexpr auto warmup_seed = 10000;
+            constexpr auto clock_resolution_estimation_time = std::chrono::milliseconds(500);
+            constexpr auto clock_cost_estimation_time_limit = std::chrono::seconds(1);
+            constexpr auto clock_cost_estimation_tick_limit = 100000;
+            constexpr auto clock_cost_estimation_time = std::chrono::milliseconds(10);
+            constexpr auto clock_cost_estimation_iterations = 10000;
 
             template <typename Clock>
             int warmup() {
-                return run_for_at_least<Clock>(std::chrono::duration_cast<ClockDuration<Clock>>(warmup_time), warmup_seed, &resolution<Clock>)
+                return run_for_at_least<Clock>(warmup_time, warmup_seed, &resolution<Clock>)
                     .iterations;
             }
             template <typename Clock>
-            EnvironmentEstimate<FloatDuration<Clock>> estimate_clock_resolution(int iterations) {
-                auto r = run_for_at_least<Clock>(std::chrono::duration_cast<ClockDuration<Clock>>(clock_resolution_estimation_time), iterations, &resolution<Clock>)
+            EnvironmentEstimate estimate_clock_resolution(int iterations) {
+                auto r = run_for_at_least<Clock>(clock_resolution_estimation_time, iterations, &resolution<Clock>)
                     .result;
                 return {
-                    FloatDuration<Clock>(mean(r.begin(), r.end())),
-                    classify_outliers(r.begin(), r.end()),
+                    FDuration(mean(r.data(), r.data() + r.size())),
+                    classify_outliers(r.data(), r.data() + r.size()),
                 };
             }
             template <typename Clock>
-            EnvironmentEstimate<FloatDuration<Clock>> estimate_clock_cost(FloatDuration<Clock> resolution) {
+            EnvironmentEstimate estimate_clock_cost(FDuration resolution) {
                 auto time_limit = (std::min)(
                     resolution * clock_cost_estimation_tick_limit,
-                    FloatDuration<Clock>(clock_cost_estimation_time_limit));
+                    FDuration(clock_cost_estimation_time_limit));
                 auto time_clock = [](int k) {
                     return Detail::measure<Clock>([k] {
                         for (int i = 0; i < k; ++i) {
@@ -80,26 +84,28 @@ namespace Catch {
                 };
                 time_clock(1);
                 int iters = clock_cost_estimation_iterations;
-                auto&& r = run_for_at_least<Clock>(std::chrono::duration_cast<ClockDuration<Clock>>(clock_cost_estimation_time), iters, time_clock);
+                auto&& r = run_for_at_least<Clock>(clock_cost_estimation_time, iters, time_clock);
                 std::vector<double> times;
                 int nsamples = static_cast<int>(std::ceil(time_limit / r.elapsed));
                 times.reserve(static_cast<size_t>(nsamples));
-                std::generate_n(std::back_inserter(times), nsamples, [time_clock, &r] {
-                    return static_cast<double>((time_clock(r.iterations) / r.iterations).count());
-                });
+                for ( int s = 0; s < nsamples; ++s ) {
+                    times.push_back( static_cast<double>(
+                        ( time_clock( r.iterations ) / r.iterations )
+                            .count() ) );
+                }
                 return {
-                    FloatDuration<Clock>(mean(times.begin(), times.end())),
-                    classify_outliers(times.begin(), times.end()),
+                    FDuration(mean(times.data(), times.data() + times.size())),
+                    classify_outliers(times.data(), times.data() + times.size()),
                 };
             }
 
             template <typename Clock>
-            Environment<FloatDuration<Clock>> measure_environment() {
+            Environment measure_environment() {
 #if defined(__clang__)
 #    pragma clang diagnostic push
 #    pragma clang diagnostic ignored "-Wexit-time-destructors"
 #endif
-                static Catch::Detail::unique_ptr<Environment<FloatDuration<Clock>>> env;
+                static Catch::Detail::unique_ptr<Environment> env;
 #if defined(__clang__)
 #    pragma clang diagnostic pop
 #endif
@@ -111,7 +117,7 @@ namespace Catch {
                 auto resolution = Detail::estimate_clock_resolution<Clock>(iters);
                 auto cost = Detail::estimate_clock_cost<Clock>(resolution.mean);
 
-                env = Catch::Detail::make_unique<Environment<FloatDuration<Clock>>>( Environment<FloatDuration<Clock>>{resolution, cost} );
+                env = Catch::Detail::make_unique<Environment>( Environment{resolution, cost} );
                 return *env;
             }
         } // namespace Detail

src/catch2/benchmark/detail/catch_measure.hpp

@@ -10,7 +10,6 @@
 #ifndef CATCH_MEASURE_HPP_INCLUDED
 #define CATCH_MEASURE_HPP_INCLUDED
 
-#include <catch2/benchmark/catch_clock.hpp>
 #include <catch2/benchmark/detail/catch_complete_invoke.hpp>
 #include <catch2/benchmark/detail/catch_timing.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
@@ -19,9 +18,9 @@ namespace Catch {
     namespace Benchmark {
         namespace Detail {
             template <typename Clock, typename Fun, typename... Args>
-            TimingOf<Clock, Fun, Args...> measure(Fun&& fun, Args&&... args) {
+            TimingOf<Fun, Args...> measure(Fun&& fun, Args&&... args) {
                 auto start = Clock::now();
-                auto&& r = Detail::complete_invoke(fun, CATCH_FORWARD(args)...);
+                auto&& r = Detail::complete_invoke(CATCH_FORWARD(fun), CATCH_FORWARD(args)...);
                 auto end = Clock::now();
                 auto delta = end - start;
                 return { delta, CATCH_FORWARD(r), 1 };

src/catch2/benchmark/detail/catch_run_for_at_least.cpp

@@ -7,9 +7,10 @@
 // SPDX-License-Identifier: BSL-1.0
 
 #include <catch2/benchmark/detail/catch_run_for_at_least.hpp>
-#include <exception>
 #include <catch2/internal/catch_enforce.hpp>
 
+#include <exception>
+
 namespace Catch {
     namespace Benchmark {
         namespace Detail {

src/catch2/benchmark/detail/catch_run_for_at_least.hpp

@@ -24,11 +24,11 @@ namespace Catch {
     namespace Benchmark {
         namespace Detail {
             template <typename Clock, typename Fun>
-            TimingOf<Clock, Fun, int> measure_one(Fun&& fun, int iters, std::false_type) {
+            TimingOf<Fun, int> measure_one(Fun&& fun, int iters, std::false_type) {
                 return Detail::measure<Clock>(fun, iters);
             }
             template <typename Clock, typename Fun>
-            TimingOf<Clock, Fun, Chronometer> measure_one(Fun&& fun, int iters, std::true_type) {
+            TimingOf<Fun, Chronometer> measure_one(Fun&& fun, int iters, std::true_type) {
                 Detail::ChronometerModel<Clock> meter;
                 auto&& result = Detail::complete_invoke(fun, Chronometer(meter, iters));
 
@@ -43,8 +43,8 @@ namespace Catch {
             void throw_optimized_away_error();
 
             template <typename Clock, typename Fun>
-            TimingOf<Clock, Fun, run_for_at_least_argument_t<Clock, Fun>>
-                run_for_at_least(ClockDuration<Clock> how_long,
+            TimingOf<Fun, run_for_at_least_argument_t<Clock, Fun>>
+                run_for_at_least(IDuration how_long,
                                  const int initial_iterations,
                                  Fun&& fun) {
                 auto iters = initial_iterations;

src/catch2/benchmark/detail/catch_stats.cpp

@@ -10,10 +10,15 @@
 #include <catch2/benchmark/detail/catch_stats.hpp>
 
 #include <catch2/internal/catch_compiler_capabilities.hpp>
+#include <catch2/internal/catch_floating_point_helpers.hpp>
+#include <catch2/internal/catch_random_number_generator.hpp>
+#include <catch2/internal/catch_uniform_integer_distribution.hpp>
 
+#include <algorithm>
 #include <cassert>
+#include <cmath>
 #include <cstddef>
-#include <iterator>
+#include <numeric>
 #include <random>
 
 
@@ -21,139 +26,199 @@
 #include <future>
 #endif
 
-namespace {
+namespace Catch {
+    namespace Benchmark {
+        namespace Detail {
+            namespace {
 
-using Catch::Benchmark::Detail::sample;
+                template <typename URng, typename Estimator>
+                static sample
+                resample( URng& rng,
+                          unsigned int resamples,
+                          double const* first,
+                          double const* last,
+                          Estimator& estimator ) {
+                    auto n = static_cast<size_t>( last - first );
+                    Catch::uniform_integer_distribution<size_t> dist( 0, n - 1 );
 
-     template <typename URng, typename Estimator>
-     sample resample(URng& rng, unsigned int resamples, std::vector<double>::iterator first, std::vector<double>::iterator last, Estimator& estimator) {
-         auto n = static_cast<size_t>(last - first);
-         std::uniform_int_distribution<decltype(n)> dist(0, n - 1);
+                    sample out;
+                    out.reserve( resamples );
+                    std::vector<double> resampled;
+                    resampled.reserve( n );
+                    for ( size_t i = 0; i < resamples; ++i ) {
+                        resampled.clear();
+                        for ( size_t s = 0; s < n; ++s ) {
+                            resampled.push_back( first[dist( rng )] );
+                        }
+                        const auto estimate =
+                            estimator( resampled.data(), resampled.data() + resampled.size() );
+                        out.push_back( estimate );
+                    }
+                    std::sort( out.begin(), out.end() );
+                    return out;
+                }
 
-         sample out;
-         out.reserve(resamples);
-         std::generate_n(std::back_inserter(out), resamples, [n, first, &estimator, &dist, &rng] {
-             std::vector<double> resampled;
-             resampled.reserve(n);
-             std::generate_n(std::back_inserter(resampled), n, [first, &dist, &rng] { return first[static_cast<std::ptrdiff_t>(dist(rng))]; });
-             return estimator(resampled.begin(), resampled.end());
-         });
-         std::sort(out.begin(), out.end());
-         return out;
-     }
+                static double outlier_variance( Estimate<double> mean,
+                                                Estimate<double> stddev,
+                                                int n ) {
+                    double sb = stddev.point;
+                    double mn = mean.point / n;
+                    double mg_min = mn / 2.;
+                    double sg = (std::min)( mg_min / 4., sb / std::sqrt( n ) );
+                    double sg2 = sg * sg;
+                    double sb2 = sb * sb;
+
+                    auto c_max = [n, mn, sb2, sg2]( double x ) -> double {
+                        double k = mn - x;
+                        double d = k * k;
+                        double nd = n * d;
+                        double k0 = -n * nd;
+                        double k1 = sb2 - n * sg2 + nd;
+                        double det = k1 * k1 - 4 * sg2 * k0;
+                        return static_cast<int>( -2. * k0 /
+                                                 ( k1 + std::sqrt( det ) ) );
+                    };
+
+                    auto var_out = [n, sb2, sg2]( double c ) {
+                        double nc = n - c;
+                        return ( nc / n ) * ( sb2 - nc * sg2 );
+                    };
+
+                    return (std::min)( var_out( 1 ),
+                                       var_out(
+                                           (std::min)( c_max( 0. ),
+                                                       c_max( mg_min ) ) ) ) /
+                           sb2;
+                }
+
+                static double erf_inv( double x ) {
+                    // Code accompanying the article "Approximating the erfinv
+                    // function" in GPU Computing Gems, Volume 2
+                    double w, p;
+
+                    w = -log( ( 1.0 - x ) * ( 1.0 + x ) );
+
+                    if ( w < 6.250000 ) {
+                        w = w - 3.125000;
+                        p = -3.6444120640178196996e-21;
+                        p = -1.685059138182016589e-19 + p * w;
+                        p = 1.2858480715256400167e-18 + p * w;
+                        p = 1.115787767802518096e-17 + p * w;
+                        p = -1.333171662854620906e-16 + p * w;
+                        p = 2.0972767875968561637e-17 + p * w;
+                        p = 6.6376381343583238325e-15 + p * w;
+                        p = -4.0545662729752068639e-14 + p * w;
+                        p = -8.1519341976054721522e-14 + p * w;
+                        p = 2.6335093153082322977e-12 + p * w;
+                        p = -1.2975133253453532498e-11 + p * w;
+                        p = -5.4154120542946279317e-11 + p * w;
+                        p = 1.051212273321532285e-09 + p * w;
+                        p = -4.1126339803469836976e-09 + p * w;
+                        p = -2.9070369957882005086e-08 + p * w;
+                        p = 4.2347877827932403518e-07 + p * w;
+                        p = -1.3654692000834678645e-06 + p * w;
+                        p = -1.3882523362786468719e-05 + p * w;
+                        p = 0.0001867342080340571352 + p * w;
+                        p = -0.00074070253416626697512 + p * w;
+                        p = -0.0060336708714301490533 + p * w;
+                        p = 0.24015818242558961693 + p * w;
+                        p = 1.6536545626831027356 + p * w;
+                    } else if ( w < 16.000000 ) {
+                        w = sqrt( w ) - 3.250000;
+                        p = 2.2137376921775787049e-09;
+                        p = 9.0756561938885390979e-08 + p * w;
+                        p = -2.7517406297064545428e-07 + p * w;
+                        p = 1.8239629214389227755e-08 + p * w;
+                        p = 1.5027403968909827627e-06 + p * w;
+                        p = -4.013867526981545969e-06 + p * w;
+                        p = 2.9234449089955446044e-06 + p * w;
+                        p = 1.2475304481671778723e-05 + p * w;
+                        p = -4.7318229009055733981e-05 + p * w;
+                        p = 6.8284851459573175448e-05 + p * w;
+                        p = 2.4031110387097893999e-05 + p * w;
+                        p = -0.0003550375203628474796 + p * w;
+                        p = 0.00095328937973738049703 + p * w;
+                        p = -0.0016882755560235047313 + p * w;
+                        p = 0.0024914420961078508066 + p * w;
+                        p = -0.0037512085075692412107 + p * w;
+                        p = 0.005370914553590063617 + p * w;
+                        p = 1.0052589676941592334 + p * w;
+                        p = 3.0838856104922207635 + p * w;
+                    } else {
+                        w = sqrt( w ) - 5.000000;
+                        p = -2.7109920616438573243e-11;
+                        p = -2.5556418169965252055e-10 + p * w;
+                        p = 1.5076572693500548083e-09 + p * w;
+                        p = -3.7894654401267369937e-09 + p * w;
+                        p = 7.6157012080783393804e-09 + p * w;
+                        p = -1.4960026627149240478e-08 + p * w;
+                        p = 2.9147953450901080826e-08 + p * w;
+                        p = -6.7711997758452339498e-08 + p * w;
+                        p = 2.2900482228026654717e-07 + p * w;
+                        p = -9.9298272942317002539e-07 + p * w;
+                        p = 4.5260625972231537039e-06 + p * w;
+                        p = -1.9681778105531670567e-05 + p * w;
+                        p = 7.5995277030017761139e-05 + p * w;
+                        p = -0.00021503011930044477347 + p * w;
+                        p = -0.00013871931833623122026 + p * w;
+                        p = 1.0103004648645343977 + p * w;
+                        p = 4.8499064014085844221 + p * w;
+                    }
+                    return p * x;
+                }
+
+                static double
+                standard_deviation( double const* first, double const* last ) {
+                    auto m = Catch::Benchmark::Detail::mean( first, last );
+                    double variance =
+                        std::accumulate( first,
+                                         last,
+                                         0.,
+                                         [m]( double a, double b ) {
+                                             double diff = b - m;
+                                             return a + diff * diff;
+                                         } ) /
+                        ( last - first );
+                    return std::sqrt( variance );
+                }
+
+                static sample jackknife( double ( *estimator )( double const*,
+                                                                double const* ),
+                                         double* first,
+                                         double* last ) {
+                    const auto second = first + 1;
+                    sample results;
+                    results.reserve( static_cast<size_t>( last - first ) );
+
+                    for ( auto it = first; it != last; ++it ) {
+                        std::iter_swap( it, first );
+                        results.push_back( estimator( second, last ) );
+                    }
+
+                    return results;
+                }
 
 
-    double erf_inv(double x) {
-        // Code accompanying the article "Approximating the erfinv function" in GPU Computing Gems, Volume 2
-        double w, p;
-
-        w = -log((1.0 - x) * (1.0 + x));
-
-        if (w < 6.250000) {
-            w = w - 3.125000;
-            p = -3.6444120640178196996e-21;
-            p = -1.685059138182016589e-19 + p * w;
-            p = 1.2858480715256400167e-18 + p * w;
-            p = 1.115787767802518096e-17 + p * w;
-            p = -1.333171662854620906e-16 + p * w;
-            p = 2.0972767875968561637e-17 + p * w;
-            p = 6.6376381343583238325e-15 + p * w;
-            p = -4.0545662729752068639e-14 + p * w;
-            p = -8.1519341976054721522e-14 + p * w;
-            p = 2.6335093153082322977e-12 + p * w;
-            p = -1.2975133253453532498e-11 + p * w;
-            p = -5.4154120542946279317e-11 + p * w;
-            p = 1.051212273321532285e-09 + p * w;
-            p = -4.1126339803469836976e-09 + p * w;
-            p = -2.9070369957882005086e-08 + p * w;
-            p = 4.2347877827932403518e-07 + p * w;
-            p = -1.3654692000834678645e-06 + p * w;
-            p = -1.3882523362786468719e-05 + p * w;
-            p = 0.0001867342080340571352 + p * w;
-            p = -0.00074070253416626697512 + p * w;
-            p = -0.0060336708714301490533 + p * w;
-            p = 0.24015818242558961693 + p * w;
-            p = 1.6536545626831027356 + p * w;
-        } else if (w < 16.000000) {
-            w = sqrt(w) - 3.250000;
-            p = 2.2137376921775787049e-09;
-            p = 9.0756561938885390979e-08 + p * w;
-            p = -2.7517406297064545428e-07 + p * w;
-            p = 1.8239629214389227755e-08 + p * w;
-            p = 1.5027403968909827627e-06 + p * w;
-            p = -4.013867526981545969e-06 + p * w;
-            p = 2.9234449089955446044e-06 + p * w;
-            p = 1.2475304481671778723e-05 + p * w;
-            p = -4.7318229009055733981e-05 + p * w;
-            p = 6.8284851459573175448e-05 + p * w;
-            p = 2.4031110387097893999e-05 + p * w;
-            p = -0.0003550375203628474796 + p * w;
-            p = 0.00095328937973738049703 + p * w;
-            p = -0.0016882755560235047313 + p * w;
-            p = 0.0024914420961078508066 + p * w;
-            p = -0.0037512085075692412107 + p * w;
-            p = 0.005370914553590063617 + p * w;
-            p = 1.0052589676941592334 + p * w;
-            p = 3.0838856104922207635 + p * w;
-        } else {
-            w = sqrt(w) - 5.000000;
-            p = -2.7109920616438573243e-11;
-            p = -2.5556418169965252055e-10 + p * w;
-            p = 1.5076572693500548083e-09 + p * w;
-            p = -3.7894654401267369937e-09 + p * w;
-            p = 7.6157012080783393804e-09 + p * w;
-            p = -1.4960026627149240478e-08 + p * w;
-            p = 2.9147953450901080826e-08 + p * w;
-            p = -6.7711997758452339498e-08 + p * w;
-            p = 2.2900482228026654717e-07 + p * w;
-            p = -9.9298272942317002539e-07 + p * w;
-            p = 4.5260625972231537039e-06 + p * w;
-            p = -1.9681778105531670567e-05 + p * w;
-            p = 7.5995277030017761139e-05 + p * w;
-            p = -0.00021503011930044477347 + p * w;
-            p = -0.00013871931833623122026 + p * w;
-            p = 1.0103004648645343977 + p * w;
-            p = 4.8499064014085844221 + p * w;
-        }
-        return p * x;
-    }
-
-    double standard_deviation(std::vector<double>::iterator first, std::vector<double>::iterator last) {
-        auto m = Catch::Benchmark::Detail::mean(first, last);
-        double variance = std::accumulate( first,
-                                           last,
-                                           0.,
-                                           [m]( double a, double b ) {
-                                               double diff = b - m;
-                                               return a + diff * diff;
-                                           } ) /
-                          ( last - first );
-        return std::sqrt( variance );
-    }
-
-}
+            } // namespace
+        }     // namespace Detail
+    }         // namespace Benchmark
+} // namespace Catch
 
 namespace Catch {
     namespace Benchmark {
         namespace Detail {
 
-#if defined( __GNUC__ ) || defined( __clang__ )
-#    pragma GCC diagnostic push
-#    pragma GCC diagnostic ignored "-Wfloat-equal"
-#endif
-            bool directCompare( double lhs, double rhs ) { return lhs == rhs; }
-#if defined( __GNUC__ ) || defined( __clang__ )
-#    pragma GCC diagnostic pop
-#endif
-
-            double weighted_average_quantile(int k, int q, std::vector<double>::iterator first, std::vector<double>::iterator last) {
+            double weighted_average_quantile( int k,
+                                              int q,
+                                              double* first,
+                                              double* last ) {
                 auto count = last - first;
                 double idx = (count - 1) * k / static_cast<double>(q);
                 int j = static_cast<int>(idx);
                 double g = idx - j;
                 std::nth_element(first, first + j, last);
                 auto xj = first[j];
-                if ( directCompare( g, 0 ) ) {
+                if ( Catch::Detail::directCompare( g, 0 ) ) {
                     return xj;
                 }
 
@@ -161,6 +226,48 @@ namespace Catch {
                 return xj + g * (xj1 - xj);
             }
 
+            OutlierClassification
+            classify_outliers( double const* first, double const* last ) {
+                std::vector<double> copy( first, last );
+
+                auto q1 = weighted_average_quantile( 1, 4, copy.data(), copy.data() + copy.size() );
+                auto q3 = weighted_average_quantile( 3, 4, copy.data(), copy.data() + copy.size() );
+                auto iqr = q3 - q1;
+                auto los = q1 - ( iqr * 3. );
+                auto lom = q1 - ( iqr * 1.5 );
+                auto him = q3 + ( iqr * 1.5 );
+                auto his = q3 + ( iqr * 3. );
+
+                OutlierClassification o;
+                for ( ; first != last; ++first ) {
+                    const double t = *first;
+                    if ( t < los ) {
+                        ++o.low_severe;
+                    } else if ( t < lom ) {
+                        ++o.low_mild;
+                    } else if ( t > his ) {
+                        ++o.high_severe;
+                    } else if ( t > him ) {
+                        ++o.high_mild;
+                    }
+                    ++o.samples_seen;
+                }
+                return o;
+            }
+
+            double mean( double const* first, double const* last ) {
+                auto count = last - first;
+                double sum = 0.;
+                while (first != last) {
+                    sum += *first;
+                    ++first;
+                }
+                return sum / static_cast<double>(count);
+            }
+
+            double normal_cdf( double x ) {
+                return std::erfc( -x / std::sqrt( 2.0 ) ) / 2.0;
+            }
 
             double erfc_inv(double x) {
                 return erf_inv(1.0 - x);
@@ -182,50 +289,77 @@ namespace Catch {
                 return result;
             }
 
+            Estimate<double>
+            bootstrap( double confidence_level,
+                       double* first,
+                       double* last,
+                       sample const& resample,
+                       double ( *estimator )( double const*, double const* ) ) {
+                auto n_samples = last - first;
 
-            double outlier_variance(Estimate<double> mean, Estimate<double> stddev, int n) {
-                double sb = stddev.point;
-                double mn = mean.point / n;
-                double mg_min = mn / 2.;
-                double sg = (std::min)(mg_min / 4., sb / std::sqrt(n));
-                double sg2 = sg * sg;
-                double sb2 = sb * sb;
+                double point = estimator( first, last );
+                // Degenerate case with a single sample
+                if ( n_samples == 1 )
+                    return { point, point, point, confidence_level };
 
-                auto c_max = [n, mn, sb2, sg2](double x) -> double {
-                    double k = mn - x;
-                    double d = k * k;
-                    double nd = n * d;
-                    double k0 = -n * nd;
-                    double k1 = sb2 - n * sg2 + nd;
-                    double det = k1 * k1 - 4 * sg2 * k0;
-                    return static_cast<int>(-2. * k0 / (k1 + std::sqrt(det)));
+                sample jack = jackknife( estimator, first, last );
+                double jack_mean =
+                    mean( jack.data(), jack.data() + jack.size() );
+                double sum_squares = 0, sum_cubes = 0;
+                for ( double x : jack ) {
+                    auto difference = jack_mean - x;
+                    auto square = difference * difference;
+                    auto cube = square * difference;
+                    sum_squares += square;
+                    sum_cubes += cube;
+                }
+
+                double accel = sum_cubes / ( 6 * std::pow( sum_squares, 1.5 ) );
+                long n = static_cast<long>( resample.size() );
+                double prob_n =
+                    std::count_if( resample.begin(),
+                                   resample.end(),
+                                   [point]( double x ) { return x < point; } ) /
+                    static_cast<double>( n );
+                // degenerate case with uniform samples
+                if ( Catch::Detail::directCompare( prob_n, 0. ) ) {
+                    return { point, point, point, confidence_level };
+                }
+
+                double bias = normal_quantile( prob_n );
+                double z1 = normal_quantile( ( 1. - confidence_level ) / 2. );
+
+                auto cumn = [n]( double x ) -> long {
+                    return std::lround( normal_cdf( x ) *
+                                        static_cast<double>( n ) );
                 };
-
-                auto var_out = [n, sb2, sg2](double c) {
-                    double nc = n - c;
-                    return (nc / n) * (sb2 - nc * sg2);
+                auto a = [bias, accel]( double b ) {
+                    return bias + b / ( 1. - accel * b );
                 };
+                double b1 = bias + z1;
+                double b2 = bias - z1;
+                double a1 = a( b1 );
+                double a2 = a( b2 );
+                auto lo = static_cast<size_t>( (std::max)( cumn( a1 ), 0l ) );
+                auto hi =
+                    static_cast<size_t>( (std::min)( cumn( a2 ), n - 1 ) );
 
-                return (std::min)(var_out(1), var_out((std::min)(c_max(0.), c_max(mg_min)))) / sb2;
+                return { point, resample[lo], resample[hi], confidence_level };
             }
 
-
-            bootstrap_analysis analyse_samples(double confidence_level, unsigned int n_resamples, std::vector<double>::iterator first, std::vector<double>::iterator last) {
-                CATCH_INTERNAL_START_WARNINGS_SUPPRESSION
-                CATCH_INTERNAL_SUPPRESS_GLOBALS_WARNINGS
-                static std::random_device entropy;
-                CATCH_INTERNAL_STOP_WARNINGS_SUPPRESSION
-
-                auto n = static_cast<int>(last - first); // seriously, one can't use integral types without hell in C++
-
-                auto mean = &Detail::mean<std::vector<double>::iterator>;
+            bootstrap_analysis analyse_samples(double confidence_level,
+                                               unsigned int n_resamples,
+                                               double* first,
+                                               double* last) {
+                auto mean = &Detail::mean;
                 auto stddev = &standard_deviation;
 
 #if defined(CATCH_CONFIG_USE_ASYNC)
-                auto Estimate = [=](double(*f)(std::vector<double>::iterator, std::vector<double>::iterator)) {
-                    auto seed = entropy();
+                auto Estimate = [=](double(*f)(double const*, double const*)) {
+                    std::random_device rd;
+                    auto seed = rd();
                     return std::async(std::launch::async, [=] {
-                        std::mt19937 rng(seed);
+                        SimplePcg32 rng( seed );
                         auto resampled = resample(rng, n_resamples, first, last, f);
                         return bootstrap(confidence_level, first, last, resampled, f);
                     });
@@ -237,9 +371,10 @@ namespace Catch {
                 auto mean_estimate = mean_future.get();
                 auto stddev_estimate = stddev_future.get();
 #else
-                auto Estimate = [=](double(*f)(std::vector<double>::iterator, std::vector<double>::iterator)) {
-                    auto seed = entropy();
-                    std::mt19937 rng(seed);
+                auto Estimate = [=](double(*f)(double const* , double const*)) {
+                    std::random_device rd;
+                    auto seed = rd();
+                    SimplePcg32 rng( seed );
                     auto resampled = resample(rng, n_resamples, first, last, f);
                     return bootstrap(confidence_level, first, last, resampled, f);
                 };
@@ -248,6 +383,7 @@ namespace Catch {
                 auto stddev_estimate = Estimate(stddev);
 #endif // CATCH_USE_ASYNC
 
+                auto n = static_cast<int>(last - first); // seriously, one can't use integral types without hell in C++
                 double outlier_variance = Detail::outlier_variance(mean_estimate, stddev_estimate, n);
 
                 return { mean_estimate, stddev_estimate, outlier_variance };