Move short enums target hook

[Paul Brook <paul at codesourcery dot com>]

The patch below moves use of the default_short_enums target hook after 
override_options. I have a followup patch that will actually use this hook 
(on arm).

Tested on i686-linux.
Ok?

Paul

2004-05-11  Paul Brook  <paul@codesourcery.com>

	* flags.h (flag_short_enums): Update comment.
	* opts.c (decode_options): Set flag_short_enums to 2.
	* toplev.c (flag_short_enums): Update comment.
	(process_options): Call default_short_enums target hook.

Index: flags.h
===================================================================
RCS file: /var/cvsroot/gcc-cvs/gcc/gcc/flags.h,v
retrieving revision 1.136
diff -u -p -r1.136 flags.h
--- a/flags.h	30 Apr 2004 05:29:22 -0000	1.136
+++ b/flags.h	11 May 2004 13:33:43 -0000
@@ -244,7 +244,8 @@ extern int flag_print_asm_name;
 
 extern int flag_signed_char;
 
-/* Nonzero means give an enum type only as many bytes as it needs.  */
+/* Nonzero means give an enum type only as many bytes as it needs.  A value
+   of 2 means it has not yet been initialized.  */
 
 extern int flag_short_enums;
 
Index: opts.c
===================================================================
RCS file: /var/cvsroot/gcc-cvs/gcc/gcc/opts.c,v
retrieving revision 1.66
diff -u -p -r1.66 opts.c
--- a/opts.c	30 Apr 2004 05:29:22 -0000	1.66
+++ b/opts.c	11 May 2004 12:17:44 -0000
@@ -604,8 +604,9 @@ decode_options (unsigned int argc, const
 
   /* Initialize whether `char' is signed.  */
   flag_signed_char = DEFAULT_SIGNED_CHAR;
-  /* Initialize how much space enums occupy, by default.  */
-  flag_short_enums = targetm.default_short_enums ();
+  /* Set this to a special "uninitialized" value.  The actual default is set
+     after target options have been processed.  */
+  flag_short_enums = 2;
 
   /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
      modify it.  */
Index: toplev.c
===================================================================
RCS file: /var/cvsroot/gcc-cvs/gcc/gcc/toplev.c,v
retrieving revision 1.895
diff -u -p -r1.895 toplev.c
--- a/toplev.c	20 Apr 2004 09:27:41 -0000	1.895
+++ b/toplev.c	11 May 2004 13:33:34 -0000
@@ -314,7 +314,8 @@ unsigned local_tick;
 
 int flag_signed_char;
 
-/* Nonzero means give an enum type only as many bytes as it needs.  */
+/* Nonzero means give an enum type only as many bytes as it needs.  A value 
of
+   2 means it has not yet been initialized.  */
 
 int flag_short_enums;
 
@@ -2232,6 +2233,9 @@ process_options (void)
   OVERRIDE_OPTIONS;
 #endif
 
+  if (flag_short_enums)
+    flag_short_enums = targetm.default_short_enums ();
+
   /* Set aux_base_name if not already set.  */
   if (aux_base_name)
     ;