dwarf2out.c (build_abbrev_table): Guard lookup_external_ref call with is_type_die.

2018-11-02  Richard Biener  <rguenther@suse.de>

	* dwarf2out.c (build_abbrev_table): Guard lookup_external_ref call
	with is_type_die.

From-SVN: r265740

gcc/ChangeLog

 2018-11-02  Richard Biener  <rguenther@suse.de>
 
+	* dwarf2out.c (build_abbrev_table): Guard lookup_external_ref call
+	with is_type_die.
+
+2018-11-02  Richard Biener  <rguenther@suse.de>
+
 	PR tree-optimization/87776
 	* tree-ssa-sccvn.c (do_rpo_vn): Do not mark backedges
 	executable when iterating but running into rpo-vn-max-loop-depth

gcc/dwarf2out.c

@@ -9023,8 +9023,9 @@ build_abbrev_table (dw_die_ref die, external_ref_hash_type *extern_map)
 	struct external_ref *ref_p;
 	gcc_assert (AT_ref (a)->comdat_type_p || AT_ref (a)->die_id.die_symbol);
 
-	ref_p = lookup_external_ref (extern_map, c);
-	if (ref_p->stub && ref_p->stub != die)
+	if (is_type_die (c)
+	    && (ref_p = lookup_external_ref (extern_map, c))
+	    && ref_p->stub && ref_p->stub != die)
 	  change_AT_die_ref (a, ref_p->stub);
 	else
 	  /* We aren't changing this reference, so mark it external.  */