How to enable /std:c++17 in VS2017 with CMake

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Turning my comment into an answer

  1. The CMake team is working on it for VS2017 (as for July 2017, for upcoming CMake version 3.10):

    CMake: MSVC standard version switches

    Those flags seem to be rather new switches (as related to the date of this question):

    VS 2017 15.3 preview now supports /std:c++17

    So for Visual Studio you have to “manually” replace or append the compiler switches until CMake officially does support it.

    Here is a code snippet that I’ve tested for std:c++latest (which is already supported e.g. in my CMake 3.8.0 version):

    if (MSVC_VERSION GREATER_EQUAL "1900")
    include(CheckCXXCompilerFlag)
    CHECK_CXX_COMPILER_FLAG("/std:c++latest" _cpp_latest_flag_supported)
    if (_cpp_latest_flag_supported)
        add_compile_options("/std:c++latest")
    endif()
endif()

  2. For CLang and GNU the support was merged into the main source code branch begin of 2017 and is part of CMake version 3.8 and above:

    CMake: Features: Add support for C++ 17 language standard

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