[LTO merge][7/15][RFA] Fortran front end

[Diego Novillo <dnovillo at google dot com>]

This patch adds support for -flto/-fwhopr in the Fortran FE.

It has been tested on x86_64 together with the the other 14
patches in this merge.

See http://gcc.gnu.org/ml/gcc/2009-09/msg00578.html for a
description of the whole set.


Thanks.  Diego.


2009-09-28  Richard Guenther  <rguenther@suse.de>

	* options.c (gfc_post_options): Handle -flto and -fwhopr.

diff -rdupN --exclude=.svn --exclude=.git --exclude='*.diff*' --exclude='autom4te*' --exclude=tags --exclude=ChangeLog.lto --exclude=configure /usr/local/google/homedirs/dnovillo/gcc/trunk/gcc/fortran/options.c /usr/local/google/homedirs/dnovillo/gcc/trunk.lto/gcc/fortran/options.c
--- /usr/local/google/homedirs/dnovillo/gcc/trunk/gcc/fortran/options.c	2009-09-23 12:44:48.000000000 -0400
+++ /usr/local/google/homedirs/dnovillo/gcc/trunk.lto/gcc/fortran/options.c	2009-09-23 11:14:53.000000000 -0400
@@ -242,6 +242,28 @@ gfc_post_options (const char **pfilename
   if (flag_whole_program)
     gfc_option.flag_whole_file = 1;
 
+  if (flag_lto || flag_whopr)
+    {
+#ifdef ENABLE_LTO
+      flag_generate_lto = 1;
+
+      /* When generating IL, do not operate in whole-program mode.
+	 Otherwise, symbols will be privatized too early, causing link
+	 errors later.  */
+      flag_whole_program = 0;
+
+      /* But do enable whole-file mode.  */
+      gfc_option.flag_whole_file = 1;
+#else
+      error ("LTO support has not been enabled in this configuration");
+#endif
+    }
+
+  /* Reconcile -flto and -fwhopr.  Set additional flags as appropriate and
+     check option consistency.  */
+  if (flag_lto && flag_whopr)
+    error ("-flto and -fwhopr are mutually exclusive");
+
   /* -fbounds-check is equivalent to -fcheck=bounds */
   if (flag_bounds_check)
     gfc_option.rtcheck |= GFC_RTCHECK_BOUNDS;