re PR debug/81155 (Debug make check regressions in GCC 8.0)

	PR debug/81155
	* bb-reorder.c (pass_partition_blocks::gate): In lto don't partition
	main to workaround a bug in GDB.

From-SVN: r256592

gcc/ChangeLog

+2018-01-12  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/81155
+	* bb-reorder.c (pass_partition_blocks::gate): In lto don't partition
+	main to workaround a bug in GDB.
+
 2018-01-12  Tom de Vries  <tom@codesourcery.com>
 
 	PR target/83737

gcc/bb-reorder.c

@@ -2873,7 +2873,10 @@ pass_partition_blocks::gate (function *fun)
 	     we are going to omit the reordering.  */
 	  && optimize_function_for_speed_p (fun)
 	  && !DECL_COMDAT_GROUP (current_function_decl)
-	  && !lookup_attribute ("section", DECL_ATTRIBUTES (fun->decl)));
+	  && !lookup_attribute ("section", DECL_ATTRIBUTES (fun->decl))
+	  /* Workaround a bug in GDB where read_partial_die doesn't cope
+	     with DIEs with DW_AT_ranges, see PR81115.  */
+	  && !(in_lto_p && MAIN_NAME_P (DECL_NAME (fun->decl))));
 }
 
 unsigned