[Bug c++/121963] Make it easier to change the location of gcm.cache dir and document it

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121963

Sam James <sjames at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
                 CC|                            |sjames at gcc dot gnu.org
   Last reconfirmed|                            |2025-10-06

--- Comment #9 from Sam James <sjames at gcc dot gnu.org> ---
Confirmed per https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121963#c1.