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## 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 cctz target to 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
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