Hi Gilles,
Several SPEC benchmarks are available at no cost for non commercial
usage.
See https://www.spec.org/order.html, you may qualify.
I checked, and I do not qualify - I am just a simple volunteer with
a day job which has nothing to do with maintaining gfortran, and
I do draw the line at paying for software in addition to the work
I donate to gcc.
It appears that wanting to supporting a closed-source,
commercial benchmark like SPEC and supporting a part of gcc
needed for that with mostly volunteers is not ideal.
Regards
Thomas
