Apologies, the changelog is what I had meant to link!
95 bug fixes since 7.1 (not 6.1) I would guess.
The changelog for 7.2 specifically is down? https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=7.2
It looks like the internet may have hugged gcc.gnu.org to death, although it looks like the archive got it before it went down: changelog, email announcement
Thanks, but I can still only see the changes for GCC 7, not the ones that are specific to GCC 7.2.