Try Intel Macos 15

This avoids calling the global's constructor on threads that will
never interact with them. Calling the constructor can have surprising
overhead, as e.g. MSVC's Debug mode `std::vector` will allocate in
the default constructor.

Closes #3050

.github/workflows/mac-builds.yml

@@ -4,13 +4,11 @@ on: [push, pull_request]
 
 jobs:
   build:
-    # From macos-14 forward, the baseline "macos-X" image is Arm based,
-    # and not Intel based.
     runs-on: ${{matrix.image}}
     strategy:
       fail-fast: false
       matrix:
-        image: [macos-13, macos-14, macos-15]
+        image: [macos-15, macos-15-intel]
         build_type: [Debug, Release]
         std: [14, 17]
 

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

@@ -1,36 +0,0 @@
-name: Mac Sanitizer Builds
-
-on: [push, pull_request]
-
-env:
-  CXXFLAGS: -fsanitize=thread,undefined
-
-jobs:
-  build:
-    # From macos-14 forward, the baseline "macos-X" image is Arm based,
-    # and not Intel based.
-    runs-on: ${{matrix.image}}
-    strategy:
-      fail-fast: false
-      matrix:
-        image: [macos-13, macos-14]
-        build_type: [Debug, Release]
-        std: [14, 17]
-
-    steps:
-    - uses: actions/checkout@v4
-
-    - name: Configure
-      
-      run: |
-        cmake --preset all-tests -GNinja \
-              -DCMAKE_BUILD_TYPE=${{matrix.build_type}} \
-              -DCMAKE_CXX_STANDARD=${{matrix.std}} \
-              -DCATCH_BUILD_EXTRA_TESTS=ON \
-              -DCATCH_ENABLE_WERROR=OFF
-
-    - name: Build
-      run: cmake --build build
-
-    - name: Test
-      run: ctest --test-dir build -R ThreadSafetyTests --timeout 21600 --verbose

src/catch2/internal/catch_console_colour.cpp

@@ -164,7 +164,9 @@ namespace {
 #if defined( CATCH_PLATFORM_LINUX ) \
  || defined( CATCH_PLATFORM_MAC ) \
  || defined( __GLIBC__ ) \
- || defined( __FreeBSD__ ) \
+ || (defined( __FreeBSD__ ) \
+     /* PlayStation platform does not have `isatty()` */ \
+     && !defined(CATCH_PLATFORM_PLAYSTATION)) \
  || defined( CATCH_PLATFORM_QNX )
 #    define CATCH_INTERNAL_HAS_ISATTY
 #    include <unistd.h>

src/catch2/internal/catch_run_context.cpp

@@ -175,11 +175,11 @@ namespace Catch {
         // below, in the future we will want to allocate piece of memory
         // from heap, to avoid consuming too much thread-local storage.
         //
-        // Note that we also don't want the thread-local variables below
-        // be initialized for every thread, only for those that touch Catch2.
-        // To make this work with both GCC/Clang and MSVC, we have to make
-        // them thread-local magic statics. (Class-level statics have
-        // the desired semantics on GCC, but not on MSVC).
+        // Note that we also don't want non-trivial the thread-local variables
+        // below be initialized for every thread, only for those that touch
+        // Catch2. To make this work with both GCC/Clang and MSVC, we have to
+        // make them thread-local magic statics. (Class-level statics have the
+        // desired semantics on GCC, but not on MSVC).
 
         // This is used for the "if" part of CHECKED_IF/CHECKED_ELSE
         static CATCH_INTERNAL_THREAD_LOCAL bool g_lastAssertionPassed = false;