re PR lto/41915 (FAIL: gcc.dg/torture/builtin-math-7.c -O2 -flto execution test)

2009-12-11  Richard Guenther  <rguenther@suse.de>

	PR lto/41915
	* lto-lang.c (lto_init_options): Initialize flag_complex_method
	to the C99 default.  Do not set flag_unit_at_a_time.

From-SVN: r155164

gcc/lto/ChangeLog

+2009-12-11  Richard Guenther  <rguenther@suse.de>
+
+	PR lto/41915
+	* lto-lang.c (lto_init_options): Initialize flag_complex_method
+	to the C99 default.  Do not set flag_unit_at_a_time.
+
 2009-11-28  Jakub Jelinek  <jakub@redhat.com>
 
 	* lto-lang.c (handle_nonnull_attribute): Remove unused attr_arg_num

gcc/lto/lto-lang.c

@@ -600,9 +600,11 @@ static unsigned int
 lto_init_options (unsigned int argc ATTRIBUTE_UNUSED,
 		  const char **argv ATTRIBUTE_UNUSED)
 {
-  /* Always operate in unit-at-time mode so that we can defer
-     decisions about what to output.  */
-  flag_unit_at_a_time = 1;
+  /* By default, C99-like requirements for complex multiply and divide.
+     ???  Until the complex method is encoded in the IL this is the only
+     safe choice.  This will pessimize Fortran code with LTO unless
+     people specify a complex method manually or use -ffast-math.  */
+  flag_complex_method = 2;
 
   return CL_LTO;
 }