[Bug c/92668] [9/10 Regression] -Wtautological-compare warns for macros that expand to the same symbol, inconsistent with C++

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92668

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-11-25
                 CC|                            |mpolacek at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Hmm, I wonder why

 473       /* If both are in a macro, only warn if they're spelled the same. 
*/
 474       if (!spelled_the_same_p (EXPR_LOCATION (lhs), EXPR_LOCATION (rhs)))
 475         return;

in warn_tautological_cmp doesn't trigger.  Confirmed to make one FE behave as
the other.