re PR target/70677 (Suboptimal cond on AVR: unneeded stack frame)

	PR 70677
	* common/config/avr/avr-common.c (avr_option_optimization_table)
	[OPT_LEVELS_ALL]: Turn off -fcaller-saves.

From-SVN: r239117

gcc/ChangeLog

 2016-08-04  Georg-Johann Lay  <avr@gjlay.de>
 
+	PR 70677
+	* common/config/avr/avr-common.c (avr_option_optimization_table)
+	[OPT_LEVELS_ALL]: Turn off -fcaller-saves.
+
+2016-08-04  Georg-Johann Lay  <avr@gjlay.de>
+
 	PR 55181
 	* config/avr/avr.md: New pattern to work around do_store_flag
 	generating shift instructions for bit extractions.

gcc/common/config/avr/avr-common.c

@@ -28,6 +28,9 @@
 static const struct default_options avr_option_optimization_table[] =
   {
     { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
+    // The only effect of -fcaller-saves might be that it triggers
+    // a frame without need when it tries to be smart around calls.
+    { OPT_LEVELS_ALL, OPT_fcaller_saves, NULL, 0 },
     { OPT_LEVELS_NONE, 0, NULL, 0 }
   };