[Bug fortran/57895] Segmentation fault in gfc_restore_last_undo_checkpoint

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57895

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic,
                   |                            |ice-on-invalid-code
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-07-15
                 CC|                            |burnus at gcc dot gnu.org
      Known to work|                            |4.1.2
     Ever confirmed|0                           |1
      Known to fail|                            |4.3.4, 4.5.3, 4.6.3, 4.7.3,
                   |                            |4.8.1, 4.9.0

--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> ---
That's a regression. GCC 4.1 gives:
   Error: Syntax error in COMMON statement at (1)
due to the '$' (and exits without failure). But GCC 4.3 and later segfault.


I think one should apply the following patch to give a good error message
(instead of none). However, it does not prevent the segfault.

--- a/gcc/fortran/match.c
+++ b/gcc/fortran/match.c
@@ -557,6 +557,6 @@ gfc_match_name (char *buffer)
   if (c == '$' && !gfc_option.flag_dollar_ok)
     {
-      gfc_error ("Invalid character '$' at %C. Use -fdollar-ok to allow it "
-                "as an extension");
+      gfc_error_now ("Invalid character '$' at %C. Use -fdollar-ok to allow it
"
+                    "as an extension");
       return MATCH_ERROR;
     }