toplev.c (output_stack_usage): Turn test on flag_stack_usage into test on stack_usage_file.

	* toplev.c (output_stack_usage): Turn test on flag_stack_usage into
	test on stack_usage_file.
	(lang_dependent_init): Do not open the .su file if generating LTO.

From-SVN: r266063

gcc/ChangeLog

+2018-11-13  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* toplev.c (output_stack_usage): Turn test on flag_stack_usage into
+	test on stack_usage_file.
+	(lang_dependent_init): Do not open the .su file if generating LTO.
+
 2018-11-13  Jakub Jelinek  <jakub@redhat.com>
 
 	PR rtl-optimization/87918

gcc/toplev.c

@@ -989,7 +989,7 @@ output_stack_usage (void)
       stack_usage += current_function_dynamic_stack_size;
     }
 
-  if (flag_stack_usage)
+  if (stack_usage_file)
     {
       expanded_location loc
 	= expand_location (DECL_SOURCE_LOCATION (current_function_decl));
@@ -1934,7 +1934,7 @@ lang_dependent_init (const char *name)
       init_asm_output (name);
 
       /* If stack usage information is desired, open the output file.  */
-      if (flag_stack_usage)
+      if (flag_stack_usage && !flag_generate_lto)
 	stack_usage_file = open_auxiliary_file ("su");
     }