GFX: work on multimon #93

Job	Run time
code formatting check	13s
cppcheck	18m 2s
min features with gcc	2m 18s
min features with g++	2m 11s
min features with clang	2m 20s
max features with gcc	3m 8s
max features with g++	2m 6s
max features with clang	2m 58s
max features with gcc and DEBUG	2m 16s
max features with gcc for 32-bit arch (legacy OS)	1m 33s
max features with g++ for 32-bit arch (legacy OS)	1m 26s
max features with clang for 32-bit arch (legacy OS)	1m 55s
	40m 26s

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