如何在使用CMake的特定构建配置中为特定目标设置特定的编译器标志？

问题描述

我有一个CMakeLists，我想使用动态版本的C运行时和一些其他目标使用静态版本构建一些目标。

I've got a CMakeLists where I want to build some targets using the dynamic version of the C runtime, and some other targets using the static version.

因为这需要根据目标设置，设置 CMAKE_CXX_FLAGS_< Config> 的默认方法不起作用;

Because this needs to be set per target, the default method of setting CMAKE_CXX_FLAGS_<Config> does not work; this overrides for all targets.

为此，我尝试了以下类似的操作：

To that end, I tried something like the following:

# @fn       set_target_dynamic_crt
# @brief    Sets the given target to use the dynamic version of the CRT (/MD or
#           /MDd)
# @param    ...  A list of targets to which this setting should be applied.
function( set_target_dynamic_crt )
    if ( MSVC )
        message (WARNING ${CMAKE_BUILD_TYPE})
        if (CMAKE_BUILD_TYPE STREQUAL "Debug")
            set_target_properties ( ${ARGN} PROPERTIES COMPILE_FLAGS "/MDd" )
        else()
            set_target_properties ( ${ARGN} PROPERTIES COMPILE_FLAGS "/MD" )
        endif()
    endif()
endfunction()

但是，这总是选择版本（ / MD ），当我查询生成类型（ message 调用上面）我得到空字符串。 （我怀疑这是因为我使用Visual Studio生成器;我看到多个参考，说 CMAKE_BUILD_TYPE 仅用于makefiles ...）

However, this always chooses the release version (/MD) and when I query for the build type (the message call above) I get the empty string. (I suspect this is because I'm using the Visual Studio generator; I've seen more than one reference that says CMAKE_BUILD_TYPE is for makefiles only...)

如何设置每个目标的编译选项？

How can I set compile options like this per target?

推荐答案

2.8.12我添加了一个target_compile_options命令来满足这个需求：

In CMake 2.8.12 I added a target_compile_options command to address this need:

target_compile_options(tgt PRIVATE "/MD$<$<CONFIG:Debug>:d>")

请参阅

更多关于CMAKE_BUILD_TYPE以及生成器表达式更好的几个原因（例如IMPORTED目标配置映射）。

for more relating to CMAKE_BUILD_TYPE and several reasons why the generator expression is better (eg IMPORTED target config mapping).

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