qBittorrent/cmake/Modules/MacroConfigureMSVCRuntime.cmake

macro(configure_msvc_runtime)
    # Default to statically-linked runtime.
    if("${MSVC_RUNTIME}" STREQUAL "")
        set(MSVC_RUNTIME "static")
    endif()
    # Set compiler options.
    set(variables
        CMAKE_C_FLAGS_DEBUG
        CMAKE_C_FLAGS_MINSIZEREL
        CMAKE_C_FLAGS_RELEASE
        CMAKE_C_FLAGS_RELWITHDEBINFO
        CMAKE_CXX_FLAGS_DEBUG
        CMAKE_CXX_FLAGS_MINSIZEREL
        CMAKE_CXX_FLAGS_RELEASE
        CMAKE_CXX_FLAGS_RELWITHDEBINFO
    )
    if(${MSVC_RUNTIME} STREQUAL "static")
        message(STATUS
            "MSVC -> forcing use of statically-linked runtime."
        )
        foreach(variable ${variables})
            if(${variable} MATCHES "/MD")
                string(REGEX REPLACE "/MD" "/MT" ${variable} "${${variable}}")
            endif()
        endforeach()
    else()
        message(STATUS
            "MSVC -> forcing use of dynamically-linked runtime."
        )
        foreach(variable ${variables})
            if(${variable} MATCHES "/MT")
                string(REGEX REPLACE "/MT" "/MD" ${variable} "${${variable}}")
            endif()
        endforeach()
    endif()
endmacro()