[Bug c++/44871] Invalid type mismatches while merging C and C++ sources

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

------- Comment #9 from rguenth at gcc dot gnu dot org  2010-07-09 13:01 -------
The following seems to work at least for the testcase:

Index: gcc/tree.c
===================================================================
--- gcc/tree.c  (revision 161994)
+++ gcc/tree.c  (working copy)
@@ -4298,6 +4298,18 @@ free_lang_data_in_type (tree type)
     {
       tree prev, member;

+      if (strcmp (lang_hooks.name, "GNU C++") == 0)
+       {
+         /* If this isn't an implicit typedef then this final
+            non-typedef name is not a struct tag.  Clear its name.
+            See PR44871 for the glory details.  */
+         if (TYPE_NAME (type)
+             && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
+             && !DECL_ORIGINAL_TYPE (TYPE_NAME (type))
+             /* DECL_IMPLICIT_TYPEDEF_P */
+             && !DECL_LANG_FLAG_2 (TYPE_NAME (type)))
+           TYPE_NAME (type) = NULL_TREE;
+       }
       /* Note that TYPE_FIELDS can be shared across distinct
         TREE_TYPEs.  Therefore, if the first field of TYPE_FIELDS is
         to be removed, we cannot set its TREE_CHAIN to NULL.

it will wreck debuginfo for T1 of course.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44871