[Bug c++/70594] [6 Regression] -fcompare-debug failure

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70594

--- Comment #18 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
For the testcases in this PR probably:
--- gcc/tree-sra.c      2016-04-09 13:21:06.111510703 +0200
+++ gcc/tree-sra.c      2016-04-11 23:11:41.253126047 +0200
@@ -1537,17 +1537,12 @@ compare_access_positions (const void *a,
 static void
 make_fancy_decl_name (tree decl)
 {
-  char buffer[32];
-
   tree name = DECL_NAME (decl);
   if (name)
     obstack_grow (&name_obstack, IDENTIFIER_POINTER (name),
                  IDENTIFIER_LENGTH (name));
   else
-    {
-      sprintf (buffer, "D%u", DECL_UID (decl));
-      obstack_grow (&name_obstack, buffer, strlen (buffer));
-    }
+    obstack_grow (&name_obstack, "Dxxxx", 5);
 }

 /* Helper for make_fancy_name.  */

or something similar would be enough (or do that only for flag_dump_final_insns
!= NULL?).  But the #c0 report suggests this affects more than that, but only
Tobias has the reproducer that.