[Bug c/61534] Wlogical-op should not warn when either operand comes from macro expansion

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61534

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-06-25
                 CC|                            |mpolacek at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This should be easy with track macro expansion on, we'd just have

--- a/gcc/input.h
+++ b/gcc/input.h
@@ -60,6 +60,8 @@ extern location_t input_location;

 #define in_system_header_at(LOC) \
   ((linemap_location_in_system_header_p (line_table, LOC)))
+#define from_macro_expansion_at(LOC) \
+  ((linemap_location_from_macro_expansion_p (line_table, LOC)))

 void dump_line_table_statistics (void);

and then we could use from_macro_expansion_at and don't warn if it's true.  But
the problem is with -ftrack-macro-expansion=0, since from_macro_expansion_at
wouldn't work :(.