Re: [easybuild] Building GCCcore that will run on AMD and Intel CPU

I believe that it's not GCC itself but the auxiliary infrastructure components (GMP, MPFR, etc.) that auto-optimize for the build architecture. Though I have to recheck the build logs to confirm this. If this is the case, we would need to find a way to convince their configure scripts to build

Re: [easybuild] Building GCCcore that will run on AMD and Intel CPU

I do not know why you are experiencing this, but I don’t think --optarch plays any role here. --optarch=GENERIC will look for the appropriate value for the compiler used, but GCCcore is built on top of dummy, which doesn’t have any optarch defined. So EB shouldn’t add any architecture specific