CMake 变量
概 述CMake中经常使用set()命令来设置一些CMake变量，本文介绍一些常用变量的含义。
变量含义
1. CMAKE_CXX_STANDARD
设置C++标准
set(CMAKE_CXX_STANDARD 11) # set(CMAKE_CXX_STANDARD 14) # set(CMAKE_CXX_STANDARD 17)
2. CMAKE_UNITY_BUILD
设置开启元编译，于CMAKE_UNITY_BUILD_BATCH_SIZE配合使用，用于加速项目编译速度，参考。
# 全局设置 set(CMAKE_UNITY_BUILD ON) # 设置元编译的batch大小 set(CMAKE_UNITY_BUILD_BATCH_SIZE 16) # 单个目标 set_target_properties(<target> PROPERTIES UNITY_BUILD ON)
3. CMAKE_BUILD_TYPE
设置单个配置生成器上的编译类型，例如Makefile等
# set(CMAKE_BUILD_TYPE "Debug") set(CMAKE_BUILD_TYPE "Release")
4. CMAKE_CONFIGURATION_TYPES
设置多配置生成器上的可用编译类型，例如Visual Studio、Xcode等
set(CMAKE_CONFIGURATION_TYPES "Release;Debug" CACHE STRING "" FORCE)
5. CMAKE_<LANG>_FLAGS
设置对应语言的编译选项，以C++为例，
CMAKE_CXX_FLAGS：设置C++编译选项 CMAKE_CXX_FLAGS_DEBUG：设置C++ Debug 编译选项 CMAKE_CXX_FLAGS_RELEASE：设置C++ Relese 编译选项
6. BUILD_USE_64BITS
设置使用64位编译
set(BUILD_USE_64BITS ON)
7. BUILD_SHARED_LIBS
设置是否生成动态库，默认是开启状态，根据add_library()生成对应的动态库
# set(BUILD_SHARED_LIBS ON) set(BUILD_SHARED_LIBS OFF)
8. CMAKE_*_OUTPUT_DIRECTORY
设置输出目录
# 全局设置 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib) set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib) set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)# 单个目标 set_target_properties( targets... PROPERTIES ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib" LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib" RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin" )
9. CMAKE_<CONFIG>_POSTFIX
设置文件后缀
# 全局设置 set(CMAKE_DEBUG_POSTFIX "_debug") set(CMAKE_RELEASE_POSTFIX "_release")# 单个目标 set_target_properties( targets... PROPERTIES DEBUG_POSTFIX "_debug" RELEASE_POSTFIX "_release" )
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