This fixes one old and annyoing bug wrt LTO and debug-information.
We pre-seed the LTO tree streamer cache with nodes from global_trees[]
and friends, but this causes the type variant chain to become corrupt
(in the sense that we do not merge TYPE_DECLs, so a get_qualified_type
will fail to find a variant because the names (TYPE_DECLs) are not
pointer-equal). dwarf2out.c already contains backup code for this
case (get_qualified_type returning NULL) using __unknown__ for
AT_name. But we can do better, use the actual name of the type.
[long term we want to stop pre-seeding the LTO tree streamer cache,
but that's clearly nothing for stage3]
Boostrap and regtest pending on x86_64-unknown-linux-gnu, ok if
that succeeds?
Thanks,
Richard.
2011-12-19 Richard Guenther <rguent...@suse.de>
PR lto/46796
* dwarf2out.c (modified_type_die): When the type variant
chain is corrupt use the types name, if available, instead
of __unknown__.
Index: gcc/dwarf2out.c
===================================================================
--- gcc/dwarf2out.c (revision 182472)
+++ gcc/dwarf2out.c (working copy)
@@ -9873,7 +9873,14 @@ modified_type_die (tree type, int is_con
}
/* This probably indicates a bug. */
else if (mod_type_die && mod_type_die->die_tag == DW_TAG_base_type)
- add_name_attribute (mod_type_die, "__unknown__");
+ {
+ name = TYPE_NAME (type);
+ if (name
+ && TREE_CODE (name) == TYPE_DECL)
+ name = DECL_NAME (name);
+ add_name_attribute (mod_type_die,
+ name ? IDENTIFIER_POINTER (name) : "__unknown__");
+ }
if (qualified_type)
equate_type_number_to_die (qualified_type, mod_type_die);
