[Bug debug/87362] GCC produces with LTO debug info with which gdb is not happy about

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87362

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
The following makes it work for a simple C int main() {}.  It's also a little
bit less hacky...

Index: gcc/dwarf2out.c
===================================================================
--- gcc/dwarf2out.c     (revision 264418)
+++ gcc/dwarf2out.c     (working copy)
@@ -26896,6 +26896,10 @@ dwarf2out_decl (tree decl)
 static void
 dwarf2out_function_decl (tree decl)
 {
+  if (in_lto_p)
+    /* This helps debuggers to build a symbol table.  */
+    if (dw_die_ref die = lookup_decl_die (decl))
+      add_linkage_attr (die, decl);
   dwarf2out_decl (decl);
   call_arg_locations = NULL;
   call_arg_loc_last = NULL;