Moved the Objective-C specific options from toplev.c.

Moved the Objective-C specific options from toplev.c. Added
-fconstant-string-class to allow specifying a user defined constant
string class, different from NXConstantString.

From-SVN: r35516

gcc/objc/lang-options.h

@@ -0,0 +1,43 @@
+/* Switch definitions for the GNU compiler for the Objective-C language.
+   Copyright (C) 2000 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  
+
+Java and all Java-based marks are trademarks or registered trademarks
+of Sun Microsystems, Inc. in the United States and other countries.
+The Free Software Foundation is independent of Sun Microsystems, Inc.  */
+
+/* This is the contribution to the `lang_options' array in gcc.c for
+   Objective-C.  */
+
+DEFINE_LANG_NAME ("Objective C")
+  
+  { "-lang-objc", "" },
+  { "-gen-decls", "Dump decls to a .decl file" },
+  { "-fgnu-runtime", "Generate code for GNU runtime environment" },
+  { "-fno-gnu-runtime", "" },
+  { "-fnext-runtime", "Generate code for NeXT runtime environment" },
+  { "-fno-next-runtime", "" },
+  { "-Wselector", "Warn if a selector has multiple methods" },
+  { "-Wno-selector", "" },
+  { "-Wprotocol", "" },
+  { "-Wno-protocol", "Do not warn if inherited methods are unimplemented"},
+  { "-print-objc-runtime-info",
+    "Generate C header of platform specific features" },
+  { "-fconstant-string-class",
+      "Specify the name of the class for constant strings" },