utils.cmake

function(get_WIN32_WINNT _WIN32_WINNT)
    if (CMAKE_SYSTEM_VERSION)
        set(_fullVersion ${CMAKE_SYSTEM_VERSION})
        message(STATUS "Windows version is: ${_fullVersion}")
        string(REGEX MATCH "^([0-9]+).([0-9])" _fullVersion ${_fullVersion})
        string(REGEX MATCH "^([0-9]+)" _majorVersion ${_fullVersion})
        # Check for Windows 10, b/c we'll need to convert to hex 'A'.
        if ("${_majorVersion}" MATCHES "10")
            set(_majorVersion "A")
            string(REGEX REPLACE "^([0-9]+)" ${_majorVersion} _fullVersion ${_fullVersion})
        endif ()
        # Remove all remaining '.' characters.
        string(REPLACE "." "" _fullVersion ${_fullVersion})
        # Prepend each digit with a zero.
        string(REGEX REPLACE "([0-9A-Z])" "0\\1" _fullVersion ${_fullVersion})
        message(STATUS "_WIN32_WINNT=${_fullVersion}")
        set(${_WIN32_WINNT} "0x${_fullVersion}" PARENT_SCOPE)
    else ()
        message(FATAL "CMAKE_SYSTEM_VERSION is not available!")
    endif ()
endfunction()