64bit integer support in flexiblas (and also in blis + aocl-blas) #3854
Description
I didn't see that we have an issue open for this yet. We should add basically
configopts = ['-DINTEGER8=ON', '']
to FlexiBLAS. @bartoldeman suggested doing in in the easyblock a while back.
We should also first make sure all the backends have 64 bit support. OpenBLAS got fixed in #2753 but we are missing it in BLIS and AOCL-BLAS
Alternatively, we could maybe extend the easyblock to allow listing different backends for 32 and 64 bit integer support, but I think it should be simple enough to add it to BLIS/AOCL-BLAS and just have it supported universally.
I also assume we do need to add additional link info, as I don't think there is a standardized ilp64 suffix (or maybe there is, i haven't looked into flexiblas buildscripts yet).