[Bug c/59668] extraneous error messages at -O1, -O2 and -O3 for valid code with string library functions

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59668

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|INVALID                     |DUPLICATE

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Zhendong Su from comment #3)
> (In reply to Andrew Pinski from comment #2)
> > Actually this is neither a bug in GCC or glibc.  In C, strcmp can be defined
> > as a macro and that is what you are getting a macro.
> 
> Huh, that's interesting; thanks.  Could you give a pointer where this is
> described? 

It is described in the C standard but I don't have the exact reference number
for it though.

> But again, how come the inconsistent behaviors at different optimization
> levels? 

Because glibc decides only to implement the macro at -O and above but not when
optimizing for size.

> 
> > You can fix your code by doing:
> > int (strcmp)(const char *, const char *);
> > 
> > Instead.

Anyways this is really a dup of bug 32449.

*** This bug has been marked as a duplicate of bug 32449 ***