Snippets for bison 3.8.2 from Fedora s390x

Sourced from https://kojipkgs.fedoraproject.org/packages/bison/3.8.2/15.fc44/data/logs/s390x/build.log.

lib/careadlinkat.c:178:5: warning: #warning "GCC might issue a bogus -Wreturn-local-addr warning here." [-Wcpp]
  178 |    #warning "GCC might issue a bogus -Wreturn-local-addr warning here."
      |     ^~~~~~~

lib/careadlinkat.c:179:5: warning: #warning "See <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93644>." [-Wcpp]
  179 |    #warning "See <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93644>."
      |     ^~~~~~~

lib/careadlinkat.c:182:10: warning: function may return address of local variable [-Wreturn-local-addr]
  182 |   return readlink_stk (fd, filename, buffer, buffer_size, alloc,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  183 |                        preadlinkat, stack_buf);
      |                        ~~~~~~~~~~~~~~~~~~~~~~~

lib/canonicalize.c:484:5: warning: #warning "GCC might issue a bogus -Wreturn-local-addr warning here." [-Wcpp]
  484 |    #warning "GCC might issue a bogus -Wreturn-local-addr warning here."
      |     ^~~~~~~

lib/canonicalize.c:485:5: warning: #warning "See <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93644>." [-Wcpp]
  485 |    #warning "See <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93644>."
      |     ^~~~~~~

lib/canonicalize.c:401:33: warning: 'end_idx' may be used uninitialized [-Wmaybe-uninitialized]
  401 |                 end = extra_buf + end_idx;
      |                       ~~~~~~~~~~^~~~~~~~~

lib/diffseq.h:425:36: warning: 'fxbest' may be used uninitialized [-Wmaybe-uninitialized]
  425 |               part->ymid = fxybest - fxbest;
      |                            ~~~~~~~~^~~~~~~~

lib/diffseq.h:432:36: warning: 'bxbest' may be used uninitialized [-Wmaybe-uninitialized]
  432 |               part->ymid = bxybest - bxbest;
      |                            ~~~~~~~~^~~~~~~~

src/counterexample.c:896:7: warning: variable 'complexity_cost' set but not used [-Wunused-but-set-variable=]
  896 |   int complexity_cost = prod1 ? PRODUCTION_COST : UNSHIFT_COST;
      |       ^~~~~~~~~~~~~~~

src/muscle-tab.c:405:14: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
  405 |   char *eq = strchr (assignment, '=');
      |              ^~~~~~

src/parse-gram.c:81:25: warning: variable 'gram_nerrs' set but not used [-Wunused-but-set-variable=]
   81 | #define yynerrs         gram_nerrs
      |                         ^~~~~~~~~~

src/print.c:422:11: warning: variable 'column' set but not used [-Wunused-but-set-variable=]
  422 |       int column = 4 + mbswidth (tag, 0);
      |           ^~~~~~

examples/c++/glr/c++-types.cc:1447:23: warning: array subscript 'const struct glr_stack_item[0]' is partly outside array bounds of 'struct glr_state[1]' [-Warray-bounds=]
 1447 |       YYASSERT (this->magic_ == MAGIC);
      |                 ~~~~~~^~~~~~

examples/c++/glr/c++-types.cc:1422:14: warning: array subscript 'const struct glr_stack_item[0]' is partly outside array bounds of 'struct glr_state[1]' [-Warray-bounds=]
 1422 |       return is_state_;
      |              ^~~~~~~~~