[Bug middle-end/92830] -fdiagnostics-url shows the wrong URL for warnings which are not in 'gcc' but e.g. in 'gfortran'

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92830

--- Comment #7 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
(In reply to GCC Commits from comment #5)
> The master branch has been updated by David Malcolm <dmalcolm@gcc.gnu.org>:
> 
> https://gcc.gnu.org/g:fa29cf0c3f19b648e30b16fd2485c3c17a528a6e
> 
> commit r10-7994-gfa29cf0c3f19b648e30b16fd2485c3c17a528a6e
> Author: David Malcolm <dmalcolm@redhat.com>
> Date:   Thu Dec 5 14:47:35 2019 -0500

[...]

>     I considered various schemes involving adding extra tags to the .opt
>     format to capture where options are documented, but for now this patch
>     fixes the issue by introducing some special-casing logic.

FWIW I've implemented such a scheme for GCC 14, in r14-6920-g9e49746da303b8
through r14-6923-g4ded42c2c5a5c9.