abseil-cpp/CMake/README.md

Abseil CMake Build Instructions

Abseil comes with a CMake build script (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 into your CMake project. Consequently, the target 'cctz' needs to be declared in your CMake project before including Abseil.
   Note: If you want to build the Abseil tests, you'll also need Google Test. 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 in your CMake project.

3. You can then use the CMake command add_subdirectory() 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() section of your executable or of your library.
   Here is a short CMakeLists.txt example of a 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)

Available Abseil CMake Public Targets

Here's a non-exhaustive list of Abseil CMake public targets:

absl::base
absl::algorithm
absl::container
absl::debugging
absl::memory
absl::meta
absl::numeric
absl::strings
absl::synchronization
absl::time
absl::utility