使用 CMake 编译/MT 而不是/MD

我在 Windows 上使用 CMake 和 WindowsSDK 和 NMake Makefile。

默认情况下，它使用 /MD编译器开关进行编译。

我如何改变它编译与 /MT开关代替？

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最佳答案

You can modify the CMAKE_<LANG>_FLAGS_<CONFIG> variables:

set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /MT")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /MTd")

If your CMake flags already contain /MD, you can ensure that the above commands are executed after the point at which /MD is inserted (the later addition of /MT overrides the conflicting existing option), or you can set the flags from scratch:

set(CMAKE_CXX_FLAGS_RELEASE "/MT")
set(CMAKE_CXX_FLAGS_DEBUG "/MTd")

Or alternatively, you could replace the existing /MD and /MDd values with /MT and /MTd respectively by doing something like:

set(CompilerFlags
CMAKE_CXX_FLAGS
CMAKE_CXX_FLAGS_DEBUG
CMAKE_CXX_FLAGS_RELEASE
CMAKE_C_FLAGS
CMAKE_C_FLAGS_DEBUG
CMAKE_C_FLAGS_RELEASE
)
foreach(CompilerFlag ${CompilerFlags})
string(REPLACE "/MD" "/MT" ${CompilerFlag} "${${CompilerFlag}}")
endforeach()
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Check out ucm_set_runtime - this macro will replace the flags for static or dynamic runtime - to see the effects, use ucm_print_flags (also checkout this Stack Overflow question).

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CMake finally added proper support for this in version 3.15 with the MSVC_RUNTIME_LIBRARY target property:

cmake_minimum_required(VERSION 3.15)
cmake_policy(SET CMP0091 NEW)
project(my_project)


add_executable(foo foo.c)
set_property(TARGET foo PROPERTY
MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")

You can also specify a global default by setting the CMAKE_MSVC_RUNTIME_LIBRARY variable instead.

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I have to use set( ... CACHE ... FORCE) to overwrite MSVC's default cache.

If I do not use this method, MSVC still outputs /MD options.

set(CompilerFlags
CMAKE_CXX_FLAGS
CMAKE_CXX_FLAGS_DEBUG
CMAKE_CXX_FLAGS_RELEASE
CMAKE_CXX_FLAGS_MINSIZEREL
CMAKE_CXX_FLAGS_RELWITHDEBINFO
CMAKE_C_FLAGS
CMAKE_C_FLAGS_DEBUG
CMAKE_C_FLAGS_RELEASE
CMAKE_C_FLAGS_MINSIZEREL
CMAKE_C_FLAGS_RELWITHDEBINFO
)
foreach(CompilerFlag ${CompilerFlags})
string(REPLACE "/MD" "/MT" ${CompilerFlag} "${${CompilerFlag}}")
set(${CompilerFlag} "${${CompilerFlag}}" CACHE STRING "msvc compiler flags" FORCE)
message("MSVC flags: ${CompilerFlag}:${${CompilerFlag}}")
endforeach()
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It seems that for Visual Studio 15 2017 and CMake 3.12 the way to replace /MD by /MT is by adding this snippet to the CMakeLists.txt file:

if(MSVC)
add_compile_options(
$<$<CONFIG:>:/MT> #---------|
$<$<CONFIG:Debug>:/MTd> #---|-- Statically link the runtime libraries
$<$<CONFIG:Release>:/MT> #--|
)
endif()

I found this solution in the official CMake repository: https://gitlab.kitware.com/cmake/cmake/issues/18390

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Since cmacke 3.15, you can use MSVC_RUNTIME_LIBRARY. See https://cmake.org/cmake/help/latest/prop_tgt/MSVC_RUNTIME_LIBRARY.html


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