Is it undefined behavior when passing redundant compiler flags to gcc?
gcc -march=skylake -mtune=skylake -O0 -ggdb -Wa,--compress-debug-sections -march=core-avx2 -mtune=core-avx2 -mrtm vs
gcc -march=skylake -mtune=skylake -O0 -ggdb -Wa,--compress-debug-sections On which architecture flags does gcc decide in that case?
