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| author |  Florin Crișan <florin.crisan@gmail.com> | 2021-06-10 02:26:40 +0300 |
|---|---|---|
| committer |  GitHub <noreply@github.com> | 2021-06-09 19:26:40 -0400 |
| commit | 8f92175783c9685045c50f227e7c10f1cddb4d58 (patch) | |
| tree | 596ca145e582da14305a9b9d6723ec649448bedd /CMake/README.md | |
| parent | f72972654b69085b1d58fde04c618b77d3ac6935 (diff) | |
CMake: add option to use Google Test already installed on system (#969)
As of this change, you can use `-DABSL_USE_EXTERNAL_GOOGLETEST=ON -DABSL_FIND_GOOGLETEST=ON` to have Abseil use the standard CMake find_package(GTest) mechanism.
Diffstat (limited to 'CMake/README.md')
| -rw-r--r-- | CMake/README.md | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/CMake/README.md b/CMake/README.md index 5eee817..fa8e8d3 100644 --- a/CMake/README.md +++ b/CMake/README.md @@ -99,3 +99,48 @@ absl::synchronization absl::time absl::utility ``` + +## Traditional CMake Set-Up + +For larger projects, it may make sense to use the traditional CMake set-up where you build and install projects separately. + +First, you'd need to build and install Google Test: +``` +cmake -S /source/googletest -B /build/googletest -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/installation/dir -DBUILD_GMOCK=ON +cmake --build /build/googletest --target install +``` + +Then you need to configure and build Abseil. Make sure you enable `ABSL_USE_EXTERNAL_GOOGLETEST` and `ABSL_FIND_GOOGLETEST`. You also need to enable `ABSL_ENABLE_INSTALL` so that you can install Abseil itself. +``` +cmake -S /source/abseil-cpp -B /build/abseil-cpp -DCMAKE_PREFIX_PATH=/installation/dir -DCMAKE_INSTALL_PREFIX=/installation/dir -DABSL_ENABLE_INSTALL=ON -DABSL_USE_EXTERNAL_GOOGLETEST=ON -DABSL_FIND_GOOGLETEST=ON +cmake --build /temporary/build/abseil-cpp +``` + +(`CMAKE_PREFIX_PATH` is where you already have Google Test installed; `CMAKE_INSTALL_PREFIX` is where you want to have Abseil installed; they can be different.) + +Run the tests: +``` +ctest --test-dir /temporary/build/abseil-cpp +``` + +And finally install: +``` +cmake --build /temporary/build/abseil-cpp --target install +``` + +# CMake Option Synposis + +## Enable Standard CMake Installation + +`-DABSL_ENABLE_INSTALL=ON` + +## Google Test Options + +`-DBUILD_TESTING=ON` must be set to enable testing + +- Have Abseil download and build Google Test for you: `-DABSL_USE_EXTERNAL_GOOGLETEST=OFF` (default) + - Download and build latest Google Test: `-DABSL_USE_GOOGLETEST_HEAD=ON` + - Download specific Google Test version (ZIP archive): `-DABSL_GOOGLETEST_DOWNLOAD_URL=https://.../version.zip` + - Use Google Test from specific local directory: `-DABSL_LOCAL_GOOGLETEST_DIR=/path/to/googletest` +- Use Google Test included elsewhere in your project: `-DABSL_USE_EXTERNAL_GOOGLETEST=ON` +- Use standard CMake `find_package(CTest)` to find installed Google Test: `-DABSL_USE_EXTERNAL_GOOGLETEST=ON -DABSL_FIND_GOOGLETEST=ON` |