如何更改 Visual Studio CMake 运行时库答案

【问题标题】：How to change Visual Studio CMake run-time library如何更改 Visual Studio CMake 运行时库
【发布时间】：2018-05-12 22:41:48
【问题描述】：

我目前正在尝试使用 Visual Studio 2017 Version 15.7.0 编译一些代码，但在更改运行时库时遇到问题。我知道有类似的问题，您通常会右键单击项目，然后通过出现的用户界面进行更改；但是，由于我使用的是 CMake，因此无法使用该用户界面，因为该用户界面没有出现。

Visual Studios 当前默认设置为使用/MD 运行时库，我想使用/MT。我尝试在顶层CMakeLists.txt 中设置此变量，但它似乎被覆盖了。我发现我可以成功构建项目的唯一方法是更改CMakeCache.txt 中/MD 的所有实例。虽然这是一个临时 hack，但我想知道这个变量的正确设置是什么，以便 Visual Studio 在编译时使用/MT。

我已经尝试过这个先前的答案link，但我没有让它工作。这是我目前的顶级CMakeLists.txt。

cmake_minimum_required (VERSION 3.11)

project ("WindowCMakeProject")
message(STATUS "Using CMake Version " ${CMAKE_VERSION})

#This project heavily uses C++ 17
set (CMAKE_CXX_STANDARD 17)

#Setup Boost
set(Boost_USE_STATIC_LIBS        ON)
set(Boost_USE_MULTITHREADED      ON)

if ( WIN32 )
    add_definitions( -DBOOST_ALL_NO_LIB )
    set(Boost_USE_STATIC_RUNTIME     ON)
    #Solution from prior answer doesn't work
    set(CMAKE_CXX_FLAGS_RELEASE "/MT")
    set(CMAKE_CXX_FLAGS_DEBUG "/MTd")
endif()


find_package(Boost 1.66.0 REQUIRED COMPONENTS system)

#Setup OpenSSL
find_package(OpenSSL REQUIRED)

#Setup Google Protobuf
find_package(Protobuf REQUIRED)

if ( DEBUG_PRINT )
    set(DEBUG_PRINT_MODE 1)
else()
    set(DEBUG_PRINT_MODE 0)
endif()

#Add Util Headers
add_subdirectory(Utils)
set (UTILS_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/Utils/include)

#Setup Server Library
set (SERVER_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/ServerLibrary/include)
add_subdirectory (ServerLibrary)
include_directories(${SERVER_INCLUDE_DIRS})

#Setup Message Helper Library
set (MESSAGE_HELPER_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/MessageHelperLibrary/include)
add_subdirectory(MessageHelperLibrary)
include_directories(${MESSAGE_HELPER_INCLUDE_DIR})

#Setup Protobufs(These are built by CMake)
add_subdirectory(ProtoFiles)
set (PROTOBUF_MESSAGE_INCLUDE_DIR ${CMAKE_CURRENT_BINARY_DIR}/ProtoFiles)


add_subdirectory (ExchangeHandlerServer)
add_subdirectory (TestServer)
add_subdirectory (TestClient)

【问题讨论】：

标签： visual-studio cmake

【解决方案1】：

不确定是否有更好的方法，但我就是这样解决的，

if ( MSVC )
    string(REPLACE "/MD" "/MT" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
    set(CMAKE_CXX_FLAGS_DEBUG ${CMAKE_CXX_FLAGS_DEBUG})

    string(REPLACE "/MD" "/MT" CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}")
    set(CMAKE_CXX_FLAGS_MINSIZEREL ${CMAKE_CXX_FLAGS_MINSIZEREL})

    string(REPLACE "/MD" "/MT" CMAKE_CXX_FLAGS_RELEASE  "${CMAKE_C_FLAGS_RELEASE}_INIT")
    set(CMAKE_CXX_FLAGS_RELEASE ${CMAKE_CXX_FLAGS_RELEASE})

    string(REPLACE "/MD" "/MT" CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
    set(CMAKE_CXX_FLAGS_RELWITHDEBINFO ${CMAKE_CXX_FLAGS_RELWITHDEBINFO})

    string(REPLACE "/MD" "/MT" CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
    set(CMAKE_C_FLAGS_DEBUG ${CMAKE_C_FLAGS_DEBUG})

    string(REPLACE "/MD" "/MT" CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL}")
    set(CMAKE_C_FLAGS_MINSIZEREL ${CMAKE_C_FLAGS_MINSIZEREL})

    string(REPLACE "/MD" "/MT" CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")
    set(CMAKE_C_FLAGS_RELEASE ${CMAKE_C_FLAGS_RELEASE})

    string(REPLACE "/MD" "/MT" CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
    set(CMAKE_C_FLAGS_RELWITHDEBINFO ${CMAKE_C_FLAGS_RELWITHDEBINFO})
endif ( MSVC )

【讨论】：

【解决方案2】：

If (MSVC)
Message ( STATUS "Setting MSVC switches")
string(REPLACE "/MTd" "/MDd" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
set(CMAKE_CXX_FLAGS_DEBUG ${CMAKE_CXX_FLAGS_DEBUG})
string(REPLACE "/MT" "/MD" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}_INIT")
set(CMAKE_CXX_FLAGS_RELEASE ${CMAKE_CXX_FLAGS_RELEASE})
Endif (MSVC)

【讨论】：