[Bug preprocessor/109704] New: #pragma {push,pop}_macro broken for identifiers that contain dollar signs at nonfirst positions

[pskocik at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109704

            Bug ID: 109704
           Summary: #pragma {push,pop}_macro broken for identifiers that
                    contain dollar signs at nonfirst positions
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: preprocessor
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pskocik at gmail dot com
  Target Milestone: ---

This following dollarsign-less example compiles fine as expected:

#define MACRO 1
_Static_assert(MACRO,"");
#pragma push_macro("MACRO")
#undef MACRO
#define MACRO 0
_Static_assert(!MACRO,"");
#pragma pop_macro("MACRO")
_Static_assert(MACRO,""); //OK


Substituting $MACRO for MACRO still works, but with MACRO$ or M$CRO the final
assertions fail: https://godbolt.org/z/n1EoGao74