flag_complex_method: support optimize attribute

gcc/c-family/ChangeLog:

	* c-opts.c (c_common_init_options_struct): Set also
	  x_flag_default_complex_method.

gcc/ChangeLog:

	* common.opt: Add new variable flag_default_complex_method.
	* opts.c (finish_options): Handle flags related to
	  x_flag_complex_method.
	* toplev.c (process_options): Remove option handling related
	to flag_complex_method.

gcc/go/ChangeLog:

	* go-lang.c (go_langhook_init_options_struct): Set also
	  x_flag_default_complex_method.

gcc/lto/ChangeLog:

	* lto-lang.c (lto_init_options_struct): Set also
	  x_flag_default_complex_method.

gcc/testsuite/ChangeLog:

	* gcc.c-torture/compile/attr-complex-method-2.c: New test.
	* gcc.c-torture/compile/attr-complex-method.c: New test.

1 files changed, 12 insertions, 0 deletions

diff --git a/gcc/opts.c b/gcc/opts.c
index 1d2d22d..38b42db 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -1331,6 +1331,18 @@ finish_options (struct gcc_options *opts, struct gcc_options *opts_set,
       = (opts->x_flag_unroll_loops
          || opts->x_flag_peel_loops
          || opts->x_optimize >= 3);
+
+  /* With -fcx-limited-range, we do cheap and quick complex arithmetic.  */
+  if (opts->x_flag_cx_limited_range)
+    opts->x_flag_complex_method = 0;
+  else if (opts_set->x_flag_cx_limited_range)
+    opts->x_flag_complex_method = opts->x_flag_default_complex_method;
+
+  /* With -fcx-fortran-rules, we do something in-between cheap and C99.  */
+  if (opts->x_flag_cx_fortran_rules)
+    opts->x_flag_complex_method = 1;
+  else if (opts_set->x_flag_cx_fortran_rules)
+    opts->x_flag_complex_method = opts->x_flag_default_complex_method;
 }
 
 #define LEFT_COLUMN	27