[Bug lto/81940] [8 regression] internal compiler error: in dwarf2out_abstract_function, at dwarf2out.c:21613

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81940

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Ok, so we have no early debug but enable late debug.  I suppose at some point
we want to have -g vs. -g0 set per function.

Index: gcc/dwarf2out.c
===================================================================
--- gcc/dwarf2out.c     (revision 251275)
+++ gcc/dwarf2out.c     (working copy)
@@ -21609,7 +21578,10 @@ dwarf2out_abstract_function (tree decl)
     return;

   old_die = lookup_decl_die (decl);
-  /* With early debug we always have an old DIE.  */
+  /* With early debug we always have an old DIE unless we are in LTO
+     and the user did not compile but only link with debug.  */
+  if (in_lto_p && ! old_die)
+    return;
   gcc_assert (old_die != NULL);
   if (get_AT (old_die, DW_AT_inline)
       || get_AT (old_die, DW_AT_abstract_origin))

mixing -g0 at compile-time with -g at link time might uncover more surprises.