[Bug c/36513] New: -Wlogical-op warns about strchr

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

Compiling the following code with gcc-4.3 -Wlogical-op -O1

int main ()
{
  char *s, t;
  strchr (s, t);
}

leads to this warning:
test2.c: In function ?main?:
test2.c:7: warning: logical ?&&? with non-zero constant will always evaluate as
true

This is because libc defines strchr to a macro in bits/string.h. It looks to me
like gcc should not warn about optimizations like __builtin_constant_p
optimizations as those are diectly targeted at being optimized out.


-- 
           Summary: -Wlogical-op warns about strchr
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: otte at gnome dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36513