[Bug lto/69393] [6 Regression] ICE in dwarf2out_finish, at dwarf2out.c:27175 with LTO

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69393

--- Comment #10 from rguenther at suse dot de <rguenther at suse dot de> ---
On Fri, 22 Jan 2016, jakub at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69393
> 
> --- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
> Yes, the type is meant to go into the debug info.  But it is DECL_NAMELESS, so
> the debug info should not contain DW_AT_name or linkage name for it.

So is_naming_typedef_decl should check DECL_NAMELESS?  Like so?

Index: gcc/dwarf2out.c
===================================================================
--- gcc/dwarf2out.c     (revision 232717)
+++ gcc/dwarf2out.c     (working copy)
@@ -22970,6 +22970,7 @@ is_naming_typedef_decl (const_tree decl)
 {
   if (decl == NULL_TREE
       || TREE_CODE (decl) != TYPE_DECL
+      || DECL_NAMELESS (decl)
       || !is_tagged_type (TREE_TYPE (decl))
       || DECL_IS_BUILTIN (decl)
       || is_redundant_typedef (decl)

this unfortunately doesn't fix the ICE for me because we don't
stream DECL_NAMELESS it seems.  If I fix that the fix above works.

The lack of consistency between where free-lang-data forces a assembler 
name and the debug
expectation is disturbing (I suppose with -fno-lto-odr-type-merging
it would ICE all over the place)