Here is an updated version of my TS29113 testsuite.  The last version I 
posted became kind of bit-rotten after Tobias's commit "Fortran: Fix 
bind(C) character length checks" for PR92842, which changed the wording 
of the error message that I'd been catching with dg-bogus in many 
places.  I've also merged some bug fixes to the test cases (most of 
which I'd already posted in conjunction with other patches to fix the 
associated library function bugs), and updated all the 
ISO_Fortran_binding.h #includes on the theory that I will iron out the 
remaining include-path problem with my patch series for PR101305 and get 
that committed before some consensus is reached on what to do about this 
patch.

With this version I'm now getting 263 XFAILs per multilib on x86.  With 
the bug fix patches I have already posted that are still awaiting 
review/committal, 42 of those go away.  And this approved but 
not-yet-committed patch from Jose

https://gcc.gnu.org/pipermail/gcc-patches/2021-June/572725.html

fixes 6 more.

Reducing the exact number of XFAILs probably doesn't matter to the 
meta-discussion about whether it is OK to commit a pile of tests with so 
many things XFAILed, but passing around updated patches like this is 
about the only way to keep a working version of the testsuite handy to 
anyone besides me who might want to help fix some of these bugs and to 
make sure we aren't introducing regressions.  :-(

-Sandra