invoke.texi (i386 and x86-64 Options): Document -m64 limitations on darwin.

2007-04-02  Eric Christopher  <echristo@apple.com>

	    * doc/invoke.texi (i386 and x86-64 Options): Document -m64
	    limitations on darwin.

From-SVN: r123446

gcc/ChangeLog

+2007-04-02  Eric Christopher  <echristo@apple.com>
+
+	* doc/invoke.texi (i386 and x86-64 Options): Document -m64
+	limitations on darwin.
+
 2007-04-02  Anatoly Sokolov <aesok@post.ru>
 
 	PR target/31137

gcc/doc/invoke.texi

@@ -10198,7 +10198,9 @@ Generate code for a 32-bit or 64-bit environment.
 The 32-bit environment sets int, long and pointer to 32 bits and
 generates code that runs on any i386 system.
 The 64-bit environment sets int to 32 bits and long and pointer
-to 64 bits and generates code for AMD's x86-64 architecture.
+to 64 bits and generates code for AMD's x86-64 architecture. For
+darwin only the -m64 option turns off the @option{-fno-pic} and
+@option{-mdynamic-no-pic} options.
 
 @item -mno-red-zone
 @opindex no-red-zone