cmake - 如何在 CMake 中配置可移植并行构建？

Question

无论使用哪种构建工具，是否都可以进行并行构建？

在Unix下，我们可以添加make -jN，其中N是线程数，在Windows下，我添加到CXX_FLAG“/MP”，然后在Visual Studio 并行构建...(？)如何使我的版本在运行 CMake 时不总是扩展 CMAKE_MAKE_PROGRAM？

什么是通用解决方案？

我想出了这个:

# Add some multithreaded build support
MARK_AS_ADVANCED(MULTITHREADED_BUILD)
set(MULTITHREADED_BUILD 12 CACHE STRING "How many threads are used to build the project")
if(MULTITHREADED_BUILD)
    if(${CMAKE_GENERATOR} MATCHES "Unix Makefiles")
            message(STATUS ${CMAKE_BUILD_TOOL})
            set(CMAKE_MAKE_PROGRAM "${CMAKE_MAKE_PROGRAM} -j${MULTITHREADED_BUILD}")
            message(STATUS "Added arguments to CMAKE_BUILD_TOOL: ${CMAKE_MAKE_PROGRAM}")
    elseif(MSVC)
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")
      message(STATUS "Added parallel build arguments to CMAKE_CXX_FLAGS: ${CMAKE_CXX_FLAGS}")
    endif()
endif()

Answer 1

使用 CMake 3.12 这是可能的。来自 release notes :

The cmake(1) Build a Project (cmake --build) gained --parallel [<jobs>] and -j [<jobs>] options to specify a parallel build level. They map to corresponding options of the native build tool.

As mentioned by dkg ，还可以设置环境变量CMAKE_BUILD_PARALLEL_LEVEL .

CMake 文档的链接:

• Build a Project
• CMAKE_BUILD_PARALLEL_LEVEL