With my documentation maintainer hat on, I've been working on updating
the standards compliance and TS29113-related material in the GNU Fortran
manual (patches will be posted soon). I also spent some time going
through the related wiki pages a few days ago to get them updated as well.
For F2003
https://gcc.gnu.org/wiki/Fortran2003Status
the only thing missing before we can claim full support is some cases of
finalization -- see comment #27 in PR37336.
For F2008
https://gcc.gnu.org/wiki/Fortran2008Status
we are missing only PR78219 (affecting DO CONCURRENT and FORALL) and the
"Data statement restrictions lifted" item.
I think it would be a Good Thing to be able to claim full implementation
of these standards, so is anybody interested in tackling these issues in
the time left for GCC 12? I wouldn't mind working on one or more of
these myself, but it looks like my management has different plans for my
time now that the TS29113-related work is winding down. :-S
-Sandra