[Bug bootstrap/50758] [4.7 Regression] Bootstrap fails at stage 2 on x86_64-apple-darwin10: error: variable 'token_no' set but not used

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50758

--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-10-17 
15:42:09 UTC ---
> Are you still seing this with commit r180090?

I have bootstrapped revision 180087 with the following patch

--- /opt/gcc/_clean/libcpp/line-map.c    2011-10-17 12:04:41.000000000 +0200
+++ /opt/gcc/work/libcpp/line-map.c    2011-10-17 15:36:30.000000000 +0200
@@ -625,7 +625,7 @@ source_location
 linemap_macro_map_loc_to_exp_point (const struct line_map *map,
                     source_location location)
 {
-  unsigned token_no;
+  unsigned token_no __attribute__ ((__unused__));

   linemap_assert (linemap_macro_expansion_map_p (map)
           && location >= MAP_START_LOCATION (map));

I guess that revision 180090 is a similar fix that should work (I'll have the
answer in a couple hours;-).

Last question: is the warning bogus or not? If no, why? If yes, I'll open a new
PR.