Support Gentoo Linux #1517

Job	Run time
cppcheck	1m 41s
code formatting check	20s
min features with gcc	2m 30s
min features with g++	3m 1s
min features with clang	2m 59s
max features with gcc	3m 5s
max features with g++	2m 34s
max features with clang	4m 13s
max features with gcc and DEBUG	2m 17s
max features with gcc for 32-bit arch (legacy OS)	2m 27s
max features with g++ for 32-bit arch (legacy OS)	1m 50s
max features with clang for 32-bit arch (legacy OS)	2m 9s
	29m 6s

Provide feedback