fix #216

Job	Run time
build (ubuntu-latest, Debug, gcc, 0)	12s
build (ubuntu-latest, Debug, gcc, 2)	50s
build (ubuntu-latest, Debug, clang, 0)	17s
build (ubuntu-latest, Debug, clang, 2)	50s
build (ubuntu-latest, Release, gcc, 0)	15s
build (ubuntu-latest, Release, gcc, 2)	20s
build (ubuntu-latest, Release, clang, 0)	18s
build (ubuntu-latest, Release, clang, 2)	23s
build (macos-latest, Debug, gcc, 0)	18s
build (macos-latest, Debug, gcc, 2)	57s
build (macos-latest, Debug, clang, 0)	20s
build (macos-latest, Debug, clang, 2)	50s
build (macos-latest, Release, gcc, 0)	15s
build (macos-latest, Release, gcc, 2)	17s
build (macos-latest, Release, clang, 0)	20s
build (macos-latest, Release, clang, 2)	19s
build (windows-latest, Debug, cl, 0)	22m 39s
build (windows-latest, Debug, cl, 2)	22m 35s
build (windows-latest, Release, cl, 0)	43s
build (windows-latest, Release, cl, 2)	50s
	53m 48s

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