fix for 48208 and 48260 on darwin

[Christian Schüler]

Hallo list,
please review the following patch (and besides, bear with me as this is the 
first patch proposal from me). For gcc 4.5 and earlier it was possible to 
configure xcode via a modified xcplugin to use the newer gcc directly (yes, 
the -arch flag was ignored during link time, but since I had -m32/-m64 
anyways, this didn't matter). With the new argument checking of version 4.6 
during the linking stage this is no longer possible. The proposed patch makes 
gcc on darwin recognize the -arch flag to the extent necessary to reinstate 
the old functionality. Besides, it fixes the already existing support for the
-F flag.

Thanks,
Christian


2011-03-28  Christian Schüler  <cschueler <at> gmx.de>

	PR 48208
	* config/c.opt: Added 'Driver' to -F option
	PR 48260
	* config/darwin-driver.c: Add '-arch' to handler function
	* config/darwin.opt: Added '-arch' option


diff -Naurw gcc-4.6.0-RC-20110321/gcc/c-family/c.opt \
gcc-4.6.0-RC-20110321-patched/gcc/c-family/c.opt
--- gcc-4.6.0-RC-20110321/gcc/c-family/c.opt	2011-02-17 22:34:10 +0100
+++ gcc-4.6.0-RC-20110321-patched/gcc/c-family/c.opt  2011-03-25 19:04:08 
+0100
@@ -201,7 +201,7 @@
 C ObjC C++ ObjC++ Undocumented Var(flag_preprocess_only)
 
 F
-C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
+Driver C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after \
%qs)
 -F <dir>	Add <dir> to the end of the main framework include path
 
 H
diff -Naurw gcc-4.6.0-RC-20110321/gcc/config/darwin-driver.c \
gcc-4.6.0-RC-20110321-patched/gcc/config/darwin-driver.c
--- gcc-4.6.0-RC-20110321/gcc/config/darwin-driver.c	2010-11-11 00:23:15 
+0100
+++ gcc-4.6.0-RC-20110321-patched/gcc/config/darwin-driver.c	2011-03-26 
07:01:02.000000000 +0100
@@ -161,6 +161,13 @@
 	continue;
       switch ((*decoded_options)[i].opt_index)
 	{
+#if DARWIN_X86
+	case OPT_arch:
+	  if (!strcmp ((*decoded_options)[i].arg, "i386"))
+		generate_option (OPT_m32, NULL, 1, CL_DRIVER, &(*decoded_options)[i]);
+	  else if (!strcmp ((*decoded_options)[i].arg, "x86_64"))
+		generate_option (OPT_m64, NULL, 1, CL_DRIVER, &(*decoded_options)[i]);
+	  break;
+#endif
+		
 	case OPT_filelist:
 	case OPT_framework:
 	  ++*decoded_options_count;
diff -Naurw gcc-4.6.0-RC-20110321/gcc/config/darwin.opt \
gcc-4.6.0-RC-20110321-patched/gcc/config/darwin.opt
--- gcc-4.6.0-RC-20110321/gcc/config/darwin.opt	2011-02-07 21:11:45 +0100
+++ gcc-4.6.0-RC-20110321-patched/gcc/config/darwin.opt	2011-03-25 19:04:08
+0100
@@ -31,6 +31,9 @@
 allowable_client
 Driver Separate Alias(Zallowable_client)
 
+arch
+Driver RejectNegative Separate 
+
 arch_errors_fatal
 Driver Alias(Zarch_errors_fatal)