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conans/client/build/cppstd_flags.py

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import warnings

from conans.errors import ConanException
from conans.model.version import Version


def cppstd_from_settings(settings):
    cppstd = settings.get_safe("cppstd")
    compiler_cppstd = settings.get_safe("compiler.cppstd")

    if not cppstd and not compiler_cppstd:
        return None

    if cppstd and compiler_cppstd:
        # Both should never arrive with a value to build_helpers
        warnings.warn("Both settings, 'cppstd' and 'compiler.cppstd', should never arrive"
                      " with values to build_helpers")
        if cppstd != compiler_cppstd:
            raise ConanException("Can't decide value for C++ standard, settings mismatch: "
                                 "'cppstd={}', 'compiler.cppstd='".format(cppstd, compiler_cppstd))

    return compiler_cppstd or cppstd


def cppstd_flag(compiler, compiler_version, cppstd, compiler_base=None):
    if not compiler or not compiler_version or not cppstd:
        return ""

    cppstd_intel = _cppstd_intel_visualstudio if compiler_base == "Visual Studio" else \
        _cppstd_intel_gcc
    func = {"gcc": _cppstd_gcc,
            "clang": _cppstd_clang,
            "apple-clang": _cppstd_apple_clang,
            "Visual Studio": _cppstd_visualstudio,
            "msvc": _cppstd_msvc,
            "intel": cppstd_intel,
            "mcst-lcc": _cppstd_mcst_lcc}.get(str(compiler), None)
    flag = None
    if func:
        flag = func(str(compiler_version), str(cppstd))
    return flag


def cppstd_flag_new(settings):
    compiler = settings.get_safe("compiler")
    compiler_version = settings.get_safe("compiler.version")
    compiler_base = settings.get_safe("compiler.base")
    cppstd = cppstd_from_settings(settings)
    return cppstd_flag(compiler, compiler_version, cppstd, compiler_base)


def cppstd_default(settings):

    compiler = settings.get_safe("compiler")
    compiler_version = settings.get_safe("compiler.version")
    compiler_base = settings.get_safe("compiler.base")
    intel_cppstd_default = _intel_visual_cppstd_default if compiler_base == "Visual Studio" \
        else _intel_gcc_cppstd_default
    default = {"gcc": _gcc_cppstd_default(compiler_version),
               "clang": _clang_cppstd_default(compiler_version),
               "apple-clang": "gnu98",  # Confirmed in apple-clang 9.1 with a simple "auto i=1;"
               "Visual Studio": _visual_cppstd_default(compiler_version),
               "intel": intel_cppstd_default(compiler_version),
               "mcst-lcc": _mcst_lcc_cppstd_default(compiler_version)}.get(str(compiler), None)
    return default


def _clang_cppstd_default(compiler_version):
    # Official docs are wrong, in 6.0 the default is gnu14 to follow gcc's choice
    return "gnu98" if Version(compiler_version) < "6" else "gnu14"


def _gcc_cppstd_default(compiler_version):
    if Version(compiler_version) >= "11":
        return "gnu17"
    return "gnu98" if Version(compiler_version) < "6" else "gnu14"


def _visual_cppstd_default(compiler_version):
    if Version(compiler_version) >= "14":  # VS 2015 update 3 only
        return "14"
    return None


def _intel_visual_cppstd_default(_):
    return None


def _intel_gcc_cppstd_default(_):
    return "gnu98"


def _mcst_lcc_cppstd_default(compiler_version):
    return "gnu14" if Version(compiler_version) >= "1.24" else "gnu98"


def _cppstd_visualstudio(visual_version, cppstd):
    # https://docs.microsoft.com/en-us/cpp/build/reference/std-specify-language-standard-version
    v14 = None
    v17 = None
    v20 = None
    v23 = None

    if Version(visual_version) >= "14":
        v14 = "c++14"
        v17 = "c++latest"
    if Version(visual_version) >= "15":
        v17 = "c++17"
        v20 = "c++latest"
    if Version(visual_version) >= "17":
        v20 = "c++20"
        v23 = "c++latest"

    flag = {"14": v14, "17": v17, "20": v20, "23": v23}.get(str(cppstd), None)
    return "/std:%s" % flag if flag else None


def _cppstd_msvc(visual_version, cppstd):
    # https://docs.microsoft.com/en-us/cpp/build/reference/std-specify-language-standard-version
    v14 = None
    v17 = None
    v20 = None
    v23 = None

    if Version(visual_version) >= "190":
        v14 = "c++14"
        v17 = "c++latest"
    if Version(visual_version) >= "191":
        v17 = "c++17"
        v20 = "c++latest"
    if Version(visual_version) >= "193":
        v20 = "c++20"
        v23 = "c++latest"

    flag = {"14": v14, "17": v17, "20": v20, "23": v23}.get(str(cppstd), None)
    return "/std:%s" % flag if flag else None


def _cppstd_apple_clang(clang_version, cppstd):
    """
    Inspired in:
    https://github.com/Kitware/CMake/blob/master/Modules/Compiler/AppleClang-CXX.cmake
    """

    v98 = vgnu98 = v11 = vgnu11 = v14 = vgnu14 = v17 = vgnu17 = v20 = vgnu20 = None

    if Version(clang_version) >= "4.0":
        v98 = "c++98"
        vgnu98 = "gnu++98"
        v11 = "c++11"
        vgnu11 = "gnu++11"

    if Version(clang_version) >= "6.1":
        v14 = "c++14"
        vgnu14 = "gnu++14"
    elif Version(clang_version) >= "5.1":
        v14 = "c++1y"
        vgnu14 = "gnu++1y"

    if Version(clang_version) >= "6.1":
        v17 = "c++1z"
        vgnu17 = "gnu++1z"

    if Version(clang_version) >= "9.1":
        # Not confirmed that it didn't work before 9.1 but 1z is still valid, so we are ok
        v17 = "c++17"
        vgnu17 = "gnu++17"

    if Version(clang_version) >= "10.0":
        v20 = "c++2a"
        vgnu20 = "gnu++2a"

    flag = {"98": v98, "gnu98": vgnu98,
            "11": v11, "gnu11": vgnu11,
            "14": v14, "gnu14": vgnu14,
            "17": v17, "gnu17": vgnu17,
            "20": v20, "gnu20": vgnu20}.get(cppstd, None)

    return "-std=%s" % flag if flag else None


def _cppstd_clang(clang_version, cppstd):
    """
    Inspired in:
    https://github.com/Kitware/CMake/blob/
    1fe2dc5ef2a1f262b125a2ba6a85f624ce150dd2/Modules/Compiler/Clang-CXX.cmake

    https://clang.llvm.org/cxx_status.html
    """
    v98 = vgnu98 = v11 = vgnu11 = v14 = vgnu14 = v17 = vgnu17 = v20 = vgnu20 = v23 = vgnu23 = None

    if Version(clang_version) >= "2.1":
        v98 = "c++98"
        vgnu98 = "gnu++98"

    if Version(clang_version) >= "3.1":
        v11 = "c++11"
        vgnu11 = "gnu++11"
    elif Version(clang_version) >= "2.1":
        v11 = "c++0x"
        vgnu11 = "gnu++0x"

    if Version(clang_version) >= "3.5":
        v14 = "c++14"
        vgnu14 = "gnu++14"
    elif Version(clang_version) >= "3.4":
        v14 = "c++1y"
        vgnu14 = "gnu++1y"

    if Version(clang_version) >= "5":
        v17 = "c++17"
        vgnu17 = "gnu++17"
    elif Version(clang_version) >= "3.5":
        v17 = "c++1z"
        vgnu17 = "gnu++1z"

    if Version(clang_version) >= "6":
        v20 = "c++2a"
        vgnu20 = "gnu++2a"

    if Version(clang_version) >= "12":
        v20 = "c++20"
        vgnu20 = "gnu++20"

        v23 = "c++2b"
        vgnu23 = "gnu++2b"

    flag = {"98": v98, "gnu98": vgnu98,
            "11": v11, "gnu11": vgnu11,
            "14": v14, "gnu14": vgnu14,
            "17": v17, "gnu17": vgnu17,
            "20": v20, "gnu20": vgnu20,
            "23": v23, "gnu23": vgnu23}.get(cppstd, None)
    return "-std=%s" % flag if flag else None


def _cppstd_gcc(gcc_version, cppstd):
    """https://github.com/Kitware/CMake/blob/master/Modules/Compiler/GNU-CXX.cmake"""
    # https://gcc.gnu.org/projects/cxx-status.html
    v98 = vgnu98 = v11 = vgnu11 = v14 = vgnu14 = v17 = vgnu17 = v20 = vgnu20 = v23 = vgnu23 = None

    if Version(gcc_version) >= "3.4":
        v98 = "c++98"
        vgnu98 = "gnu++98"

    if Version(gcc_version) >= "4.7":
        v11 = "c++11"
        vgnu11 = "gnu++11"
    elif Version(gcc_version) >= "4.3":
        v11 = "c++0x"
        vgnu11 = "gnu++0x"

    if Version(gcc_version) >= "4.9":
        v14 = "c++14"
        vgnu14 = "gnu++14"
    elif Version(gcc_version) >= "4.8":
        v14 = "c++1y"
        vgnu14 = "gnu++1y"

    if Version(gcc_version) >= "5":
        v17 = "c++1z"
        vgnu17 = "gnu++1z"

    if Version(gcc_version) >= "5.2":  # Not sure if even in 5.1 gnu17 is valid, but gnu1z is
        v17 = "c++17"
        vgnu17 = "gnu++17"

    if Version(gcc_version) >= "8":
        v20 = "c++2a"
        vgnu20 = "gnu++2a"

    if Version(gcc_version) >= "11":
        v23 = "c++2b"
        vgnu23 = "gnu++2b"

    flag = {"98": v98, "gnu98": vgnu98,
            "11": v11, "gnu11": vgnu11,
            "14": v14, "gnu14": vgnu14,
            "17": v17, "gnu17": vgnu17,
            "20": v20, "gnu20": vgnu20,
            "23": v23, "gnu23": vgnu23}.get(cppstd)
    return "-std=%s" % flag if flag else None


def _cppstd_intel_common(intel_version, cppstd, vgnu98, vgnu0x):
    # https://software.intel.com/en-us/cpp-compiler-developer-guide-and-reference-std-qstd
    # https://software.intel.com/en-us/articles/intel-cpp-compiler-release-notes
    # NOTE: there are only gnu++98 and gnu++0x, and only for Linux/macOS
    v98 = v11 = v14 = v17 = v20 = None
    vgnu11 = vgnu14 = vgnu17 = vgnu20 = None

    if Version(intel_version) >= "12":
        v11 = "c++0x"
        vgnu11 = vgnu0x
    if Version(intel_version) >= "14":
        v11 = "c++11"
        vgnu11 = vgnu0x
    if Version(intel_version) >= "16":
        v14 = "c++14"
    if Version(intel_version) >= "18":
        v17 = "c++17"
    if Version(intel_version) >= "19.1":
        v20 = "c++20"

    return {"98": v98, "gnu98": vgnu98,
            "11": v11, "gnu11": vgnu11,
            "14": v14, "gnu14": vgnu14,
            "17": v17, "gnu17": vgnu17,
            "20": v20, "gnu20": vgnu20}.get(cppstd)


def _cppstd_intel_gcc(intel_version, cppstd):
    flag = _cppstd_intel_common(intel_version, cppstd, "gnu++98", "gnu++0x")
    return "-std=%s" % flag if flag else None


def _cppstd_intel_visualstudio(intel_version, cppstd):
    flag = _cppstd_intel_common(intel_version, cppstd, None, None)
    return "/Qstd=%s" % flag if flag else None


def _cppstd_mcst_lcc(mcst_lcc_version, cppstd):
    v11 = vgnu11 = v14 = vgnu14 = v17 = vgnu17 = v20 = vgnu20 = None

    if Version(mcst_lcc_version) >= "1.21":
        v11 = "c++11"
        vgnu11 = "gnu++11"
        v14 = "c++14"
        vgnu14 = "gnu++14"

    if Version(mcst_lcc_version) >= "1.24":
        v17 = "c++17"
        vgnu17 = "gnu++17"

    if Version(mcst_lcc_version) >= "1.25":
        v20 = "c++2a"
        vgnu20 = "gnu++2a"

    flag = {"98": "c++98", "gnu98": "gnu++98",
            "03": "c++03", "gnu03": "gnu++03",
            "11": v11, "gnu11": vgnu11,
            "14": v14, "gnu14": vgnu14,
            "17": v17, "gnu17": vgnu17,
            "20": v20, "gnu20": vgnu20}.get(cppstd)
    return "-std=%s" % flag if flag else None