[Bug fortran/106005] (F2023) Support for REDUCE clause in DO CONCURRENT loop

[kargl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106005

--- Comment #11 from Steve Kargl <kargl at gcc dot gnu.org> ---
(In reply to Ron from comment #9)
> Hi,
> 
> I would like to suggest that it is not necessary to 
> fully "implement" REDUCE() on DO CONCURRENT loops right now,
> but that it should at least be "recognized" by the compiler so it can
> compile and run with GFORTRAN.
> 
> Right now, NVFORTRAN, IFX, AMDFLANG, FLANG, NAG, FTN, etc. all
> support/recognize reduce.
> 
> GCC is now an outlier.

Outlier?  Check git log -r 20b8500cfa522eb shows that it was 
added on 01/13/25.  That's roughly a 1.5 years ago.  You need
to use version 15 or 16 or the upcoming 17.  At most, the 
changes could be backported to the 13 and 14 branches (older
branches are EOL), but there is an unfortunate lack of man
power.