def METHOD_NAME(self, os, arch):
    if os == "iOS":
        if arch in ["armv8", "armv8.3"]:
            return "OS64"
        if arch == "x86_64":
            return "SIMULATOR64"
        # 32bit is dead, don't care
    elif os == "watchOS":
        if arch == "x86_64":
            return "SIMULATOR_WATCHOS"
        else:
            return "WATCHOS"
    elif os == "tvOS":
        if arch == "x86_64":
            return "TVOS"
        else:
            return "SIMULATOR_TVOS"
    raise ConanInvalidConfiguration("Can not guess toolchain_target. Please set the option explicit (or check our os settings)")