CMake

Merge pull request #27 from aganm/attribute #66

Job	Run time
build (ubuntu-latest, Debug, clang)	19s
build (ubuntu-latest, Debug, gcc)	23s
build (ubuntu-latest, Debug, tcc)	20s
build (ubuntu-latest, RelWithDebInfo, clang)	26s
build (ubuntu-latest, RelWithDebInfo, gcc)	20s
build (ubuntu-latest, RelWithDebInfo, tcc)	19s
build (ubuntu-latest, MinSizeRel, clang)	23s
build (ubuntu-latest, MinSizeRel, gcc)	18s
build (ubuntu-latest, MinSizeRel, tcc)	18s
build (ubuntu-latest, Release, clang)	19s
build (ubuntu-latest, Release, gcc)	33s
build (ubuntu-latest, Release, tcc)	39s
build (windows-latest, Debug, default)	1m 12s
build (windows-latest, Debug, clang)	1m 40s
build (windows-latest, RelWithDebInfo, default)	41s
build (windows-latest, RelWithDebInfo, clang)	1m 18s
build (windows-latest, MinSizeRel, default)	59s
build (windows-latest, MinSizeRel, clang)	1m 47s
build (windows-latest, Release, default)	59s
build (windows-latest, Release, clang)	1m 25s
build (macOS-latest, Debug, default)	26s
build (macOS-latest, RelWithDebInfo, default)	38s
build (macOS-latest, MinSizeRel, default)	27s
build (macOS-latest, Release, default)	27s
	16m 36s

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