[Bug lto/91027] [10 regression] SEGV in hash_table<odr_name_hasher, false, xcallocator>::find_slot_with_hash

[hubicka at ucw dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91027

--- Comment #3 from Jan Hubicka <hubicka at ucw dot cz> ---
Hi,
this patch triggers another confusion in ipa-devirt.
It tries to build type inheritnace graph but since D frotnend produces
only functions with DECL_VIRTUAL but no BINFOs and other things it
segfaults eventually.

Working around it makes it to work. So this adds new question why D
frontend needs to set DECL_VIRTUAL?

Honza

Index: tree.c
===================================================================
--- tree.c      (revision 273084)
+++ tree.c      (working copy)
@@ -6140,6 +6142,11 @@ find_decls_types_in_var (varpool_node *v
 void
 assign_assembler_name_if_needed (tree t)
 {
+  /* D frontend sets assembler name of TYPE_DECLs.
+     We later use them to maintain ODR infrmation for C++, but these
+     names are always computed by decl_assembler_name call below.  */
+  if (TREE_CODE (t) == TYPE_DECL)
+    SET_DECL_ASSEMBLER_NAME (t, NULL);
   if (need_assembler_name_p (t))
     {
       /* When setting DECL_ASSEMBLER_NAME, the C++ mangler may emit