[committed] update i386 -m64 documentation for darwin

[committed] update i386 -m64 documentation for darwin

[Eric Christopher]

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So, the current design for x86_64 darwin has -fPIC on at all times,  
this has the effect of making -mdynamic-no-pic and -fno-pic not work  
so someone should probably document it.

Committed mainline and to 4.2. Tested by building the docs and looking  
at gcc.texi.

-eric

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

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



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Index: doc/invoke.texi
===================================================================
--- doc/invoke.texi	(revision 123445)
+++ doc/invoke.texi	(working copy)
@@ -10198,7 +10198,9 @@ Generate code for a 32-bit or 64-bit env
 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