[Bug c/30743] New: Bogus warning on argument passing discarding qualifiers

["gdr at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

The following is a testcase distilled from a build failure while compiling
CVS GDB:

/home/gdr/redhat/src/gdb/ada-lang.c: In function 'ada_lookup_symbol_list':
/home/gdr/redhat/src/gdb/ada-lang.c:4659: warning: passing argument 3 of
'remove_out_of_scope_renamings' discards qualifiers from pointer target type
make[2]: *** [ada-lang.o] Error 1


How to repeat:

% cat b.c && gcc -c -O2 -Wall -Werror b.c

struct T { int i; };

static int f(struct T* p) { return p->i; }

int g(const struct T* p) { return f((struct T*)p); }

int main(void)
{
   struct T t = {0};
   return g(&t);
}

cc1: warnings being treated as errors
b.c: In function 'g':
b.c:6: warning: passing argument 1 of 'f' discards qualifiers from pointer
target type


-- 
           Summary: Bogus warning on argument passing discarding qualifiers
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: gdr at gcc dot gnu dot org
  GCC host triplet: native build; platform independent


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30743