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Update CMake integration documentation

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Martin Hořeňovský
2021-07-31 21:46:11 +02:00
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@@ -2,7 +2,7 @@
# CMake integration
**Contents**<br>
[CMake target](#cmake-target)<br>
[CMake targets](#cmake-targets)<br>
[Automatic test registration](#automatic-test-registration)<br>
[CMake project options](#cmake-project-options)<br>
[Installing Catch2 from git repository](#installing-catch2-from-git-repository)<br>
@@ -15,28 +15,33 @@ integration points for our users.
2) Catch2's repository contains CMake scripts for automatic registration
of `TEST_CASE`s in CTest
## CMake target
## CMake targets
Catch2's CMake build exports an interface target `Catch2::Catch2`. Linking
against it will add the proper include path and all necessary capabilities
to the resulting binary.
Catch2's CMake build exports two targets, `Catch2::Catch2`, and
`Catch2::Catch2WithMain`. If you do not need custom `main` function,
you should be using the latter (and only the latter). Linking against
it will add the proper include paths and link your target together with
2 static libraries that implement Catch2 and its main respectively.
If you need custom `main`, you should link only against `Catch2::Catch2`.
This means that if Catch2 has been installed on the system, it should be
enough to do:
This means that if Catch2 has been installed on the system, it should
be enough to do
```cmake
find_package(Catch2 REQUIRED)
find_package(Catch2 3 REQUIRED)
# These tests can use the Catch2-provided main
add_executable(tests test.cpp)
target_link_libraries(tests PRIVATE Catch2::Catch2)
target_link_libraries(tests PRIVATE Catch2::Catch2WithMain)
# These tests need their own main
add_executable(custom-main-tests test.cpp test-main.cpp)
target_link_libraries(custom-main-tests PRIVATE Catch2::Catch2WithMain)
```
These targets are also provided when Catch2 is used as a subdirectory.
Assuming Catch2 has been cloned to `lib/Catch2`, you only need to replace
the `find_package` call with `add_subdirectory(lib/Catch2)` and the snippet
above still works.
This target is also provided when Catch2 is used as a subdirectory.
Assuming that Catch2 has been cloned to `lib/Catch2`:
```cmake
add_subdirectory(lib/Catch2)
add_executable(tests test.cpp)
target_link_libraries(tests PRIVATE Catch2::Catch2)
```
Another possibility is to use [FetchContent](https://cmake.org/cmake/help/latest/module/FetchContent.html):
```cmake
@@ -45,14 +50,16 @@ Include(FetchContent)
FetchContent_Declare(
Catch2
GIT_REPOSITORY https://github.com/catchorg/Catch2.git
GIT_TAG v2.13.1)
GIT_TAG v3.0.0-preview3
)
FetchContent_MakeAvailable(Catch2)
add_executable(tests test.cpp)
target_link_libraries(tests PRIVATE Catch2::Catch2)
target_link_libraries(tests PRIVATE Catch2::Catch2WithMain)
```
## Automatic test registration
Catch2's repository also contains two CMake scripts that help users
@@ -88,7 +95,7 @@ include(Catch)
catch_discover_tests(foo)
```
When using `FetchContent`, `include(Catch)` will fail unless
When using `FetchContent`, `include(Catch)` will fail unless
`CMAKE_MODULE_PATH` is explicitly updated to include the contrib
directory.
@@ -252,7 +259,21 @@ ParseAndAddCatchTests(bar)
## CMake project options
Catch2's CMake project also provides some options for other projects
that consume it. These are
that consume it. These are:
* `BUILD_TESTING` -- When `ON` and the project is not used as a subproject,
Catch2's test binary will be built. Defaults to `ON`.
* `CATCH_INSTALL_DOCS` -- When `ON`, Catch2's documentation will be
included in the installation. Defaults to `ON`.
* `CATCH_INSTALL_HELPERS` -- When `ON`, Catch2's contrib folder will be
included in the installation. Defaults to `ON`.
* `CATCH_DEVELOPMENT_BUILD` -- When `ON`, configures the build for development
of Catch2. This means enabling test projects, warnings and so on.
Defaults to `OFF`.
Enabling `CATCH_DEVELOPMENT_BUILD` also enables further configuration
customization options:
* `CATCH_BUILD_TESTING` -- When `ON`, Catch2's SelfTest project will be
built. Defaults to `ON`. Note that Catch2 also obeys `BUILD_TESTING` CMake
@@ -260,12 +281,15 @@ variable, so _both_ of them need to be `ON` for the SelfTest to be built,
and either of them can be set to `OFF` to disable building SelfTest.
* `CATCH_BUILD_EXAMPLES` -- When `ON`, Catch2's usage examples will be
built. Defaults to `OFF`.
* `CATCH_INSTALL_DOCS` -- When `ON`, Catch2's documentation will be
included in the installation. Defaults to `ON`.
* `CATCH_INSTALL_HELPERS` -- When `ON`, Catch2's contrib folder will be
included in the installation. Defaults to `ON`.
* `BUILD_TESTING` -- When `ON` and the project is not used as a subproject,
Catch2's test binary will be built. Defaults to `ON`.
* `CATCH_BUILD_EXTRA_TESTS` -- When `ON`, Catch2's extra tests will be
built. Defaults to `OFF`.
* `CATCH_BUILD_FUZZERS` -- When `ON`, Catch2 fuzzing entry points will
be built. Defaults to `OFF`.
* `CATCH_ENABLE_WERROR` -- When `ON`, adds `-Werror` or equivalent flag
to the compilation. Defaults to `ON`.
* `CATCH_BUILD_SURROGATES` -- When `ON`, each header in Catch2 will be
compiled separately to ensure that they are self-sufficient.
Defaults to `OFF`.
## Installing Catch2 from git repository