tvl-depot/CMake/README.md
Abseil Team 075cf62092 Changes imported from Abseil "staging" branch:
- c3a608de577e0c278b50916ad4803549929f8f72 Merging https://github.com/abseil/abseil-cpp/pull/8/ inte... by Gennadiy Civil <misterg@google.com>
  - d0b528cdf5843db871784c629cb4e7c5165af716 explicitly cast -1 for Span::npos by Jon Cohen <cohenjon@google.com>
  - 32066311a4379f1144f029aaa3740af59b1e364e Remove GUARDED_VAR and PT_GUARDED_VAR entirely. by Abseil Team <absl-team@google.com>
  - 3d3c69d97d15b5c6457906631054109094c083a6 Remove unneeded inline on constexpr definitions. by Alex Strelnikov <strel@google.com>
  - a9a8fe71f90d0b80de8e77375228a7185032636b Remove unneeded lint suppression. by Alex Strelnikov <strel@google.com>

GitOrigin-RevId: c3a608de577e0c278b50916ad4803549929f8f72
Change-Id: I0897ce0b11e41f83fed8d88f18e079a15d086527
2017-11-06 15:58:57 -05:00

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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`.
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}")
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)
You will need to create your own CMake files for cctz until https://github.com/google/cctz/pull/54 lands. 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