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diff --git a/CMake/README.md b/CMake/README.md index 268fd65d8248..bfcf5807abd6 100644 --- a/CMake/README.md +++ b/CMake/README.md @@ -1,80 +1,82 @@ -## Abseil CMake build instructions - - -### Recommended usage : incorporate Abseil into an CMake project - - For API / ABI compatibility reasons, it is recommended to build - and use abseil in a subdirectory of your project or as an embedded - dependency - - This is similar to the recommended usage of the googletest framework - ( https://github.com/google/googletest/blob/master/googletest/README.md ) - - Build and use step-by-step - - - 1- Download abseil and copy it in a sub-directory in your project. - or add abseil as a git-submodule in your project - - 2- If not done yet, download and copy in your project the two dependencies of - abseil `cctz` and `googletest` - - * cctz https://github.com/google/cctz - * googletest https://github.com/google/googletest - - 3- You can then use the cmake command `add_subdirectory()` to include - abseil directly and use the abseil targets in your project. - - Note: Abseil requires CCTZ and the googletest framework. Consequently, - the targets `gtest`, `gtest_main`, `gmock` and `cctz` need - to be declared in your project before including abseil with - `add_subdirectory`. However, if abseil is compiled with - `-DBUILD_TESTING=OFF`, then `gtest`, `gmock` and `gtest_main` are not - required. In addition, it's possible to override the name of the `cctz` - target to a custom one with option `-DABSL_CCTZ_TARGET=*my_cctz*`. - - 4- Add the absl:: target you wish to use to the `target_link_libraries()` - section of your executable or of your library - - - Here is a short CMakeLists.txt example of a possible project file - using abseil - - cmake_minimum_required(VERSION 2.8.12) - project(my_project) - - set(CMAKE_CXX_FLAGS "-std=c++11 -stdlib=libc++ ${CMAKE_CXX_FLAGS}") - - if (MSVC) - # /wd4005 macro-redefinition - # /wd4068 unknown pragma - # /wd4244 conversion from 'type1' to 'type2' - # /wd4267 conversion from 'size_t' to 'type2' - # /wd4800 force value to bool 'true' or 'false' (performance warning) - add_compile_options(/wd4005 /wd4068 /wd4244 /wd4267 /wd4800) - add_definitions(/DNOMINMAX /DWIN32_LEAN_AND_MEAN=1 /D_CRT_SECURE_NO_WARNINGS) - endif() - - add_subdirectory(googletest) - add_subdirectory(cctz) - add_subdirectory(abseil-cpp) - - add_executable(my_exe source.cpp) - target_link_libraries(my_exe absl::base absl::synchronization absl::strings) - - -As of this writing, that pull request requires -DBUILD_TESTING=OFF as it doesn't correctly export cctz's dependency on Google Benchmark. - - You will find here a non exhaustive list of absl public targets - - absl::base - absl::algorithm - absl::container - absl::debugging - absl::memory - absl::meta - absl::numeric - absl::strings - absl::synchronization - absl::time - absl::utility +# Abseil CMake Build Instructions + +Abseil comes with a CMake build script ([CMakeLists.txt](../CMakeLists.txt)) +that can be used on a wide range of platforms ("C" stands for cross-platform.). +If you don't have CMake installed already, you can download it for free from +<http://www.cmake.org/>. + +CMake works by generating native makefiles or build projects that can +be used in the compiler environment of your choice. + +For API/ABI compatibility reasons, we strongly recommend building Abseil in a +subdirectory of your project or as an embedded dependency. + +## Incorporating Abseil Into a CMake Project + +The recommendations below are similar to those for using CMake within the +googletest framework +(<https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project>) + +### Step-by-Step Instructions + +1. If you haven't done so already, integrate the Abseil dependency +[CCTZ](https://github.com/google/cctz) into your CMake project. Consequently, the +target 'cctz' needs to be declared in your CMake project **before** including Abseil.<br> +Note: If you want to build the Abseil tests, you'll also need [Google Test](https://github.com/google/googletest). To disable Abseil tests, you have to pass +`-DBUILD_TESTING=OFF` when configuring your project with CMake. + +2. Download Abseil and copy it into a subdirectory in your CMake project or add +Abseil as a [git submodule](https://git-scm.com/docs/git-submodule) in your +CMake project. + +3. You can then use the CMake command +[`add_subdirectory()`](https://cmake.org/cmake/help/latest/command/add_subdirectory.html) +to include Abseil directly in your CMake project. In addition, it's possible to +customize the name of the `cctz` target with the `-DABSL_CCTZ_TARGET=*my_cctz*` option. + +4. Add the **absl::** target you wish to use to the +[`target_link_libraries()`](https://cmake.org/cmake/help/latest/command/target_link_libraries.html) +section of your executable or of your library.<br> +Here is a short CMakeLists.txt example of a project file using Abseil. + +```cmake +cmake_minimum_required(VERSION 2.8.12) +project(my_project) + +set(CMAKE_CXX_FLAGS "-std=c++11 -stdlib=libc++ ${CMAKE_CXX_FLAGS}") + +if(MSVC) + # /wd4005 macro-redefinition + # /wd4068 unknown pragma + # /wd4244 conversion from 'type1' to 'type2' + # /wd4267 conversion from 'size_t' to 'type2' + # /wd4800 force value to bool 'true' or 'false' (performance warning) + add_compile_options(/wd4005 /wd4068 /wd4244 /wd4267 /wd4800) + add_definitions(/DNOMINMAX /DWIN32_LEAN_AND_MEAN=1 /D_CRT_SECURE_NO_WARNINGS) +endif() + +add_subdirectory(googletest) +add_subdirectory(cctz) +add_subdirectory(abseil-cpp) + +add_executable(my_exe source.cpp) +target_link_libraries(my_exe absl::base absl::synchronization absl::strings) +``` + +### Available Abseil CMake Public Targets + +Here's a non-exhaustive list of Abseil CMake public targets: + +```cmake +absl::base +absl::algorithm +absl::container +absl::debugging +absl::memory +absl::meta +absl::numeric +absl::strings +absl::synchronization +absl::time +absl::utility +``` |