RTEMS Source Builder | config/gmp: Add GCC 14+ compatibility warning (!165)

[Priyanshu Shah (@pvshah)]

Priyanshu Shah commented on a discussion on source-builder/config/gmp.cfg: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/merge_requests/165#note_129328

 > +  echo "==============================================================================="
 > +  echo "WARNING: GCC %{gcc_version_check} detected - GMP compilation may fail"
 > +  echo "==============================================================================="
 > +  echo ""
 > +  echo "GCC 14 and later default to C23 standard, which may cause compilation failures"
 > +  echo "with GMP %{gmp_version}. If you encounter build errors, consider using:"
 > +  echo ""
 > +  echo "  - GCC 12 or GCC 13 (recommended)"
 > +  echo "  - Or export CC=gcc-12 (or gcc-13) before running the build"
 > +  echo ""
 > +  echo "This is a known compatibility issue with newer GCC versions."
 > +  echo "==============================================================================="
 > +  echo ""
 > +  %endif
 > +
 >    ./configure \

I don't really understand why it should be set to c++17, the issue is with gnu14's implicit function declaration, setting it to something like "-std=gnu11" seems more logical to me.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/merge_requests/165#note_129328
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