Merge pull request #363 from kingiler/master #203

Job	Run time
Build and test g++-9 -	8m 14s
Build and test g++-10 -	9m 44s
Build and test clang++-10 -	6m 52s
Build and test clang++-11 -	9m 3s
Build and test g++-9 - -DPBRT_DBG_LOGGING=True	6m 49s
Build and test g++-10 - -DPBRT_DBG_LOGGING=True	7m 34s
Build and test clang++-10 - -DPBRT_DBG_LOGGING=True	7m 46s
Build and test clang++-11 - -DPBRT_DBG_LOGGING=True	6m 25s
Build and test g++-9 - -DPBRT_FLOAT_AS_DOUBLE=True	7m 33s
Build and test g++-10 - -DPBRT_FLOAT_AS_DOUBLE=True	8m 50s
Build and test clang++-10 - -DPBRT_FLOAT_AS_DOUBLE=True	5m 36s
Build and test clang++-11 - -DPBRT_FLOAT_AS_DOUBLE=True	6m 35s
	1h 31m 1s

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