if str(compiler) in ['Visual Studio', 'msvc']:
        if vs_toolset and "clang" in str(vs_toolset):
            flags = {"Debug": ["-gline-tables-only", "-fno-inline", "-O0"],
                     "Release": ["-O2"],
                     "RelWithDebInfo": ["-gline-tables-only", "-O2", "-fno-inline"],