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Re: Add -mkernel for darwin

Almost forgot this portion:

* doc/invoke.texi (Darwin Options): Document -mkernel.

Doing diffs in doc:
--- doc/invoke.texi.~1~ 2006-10-11 19:27:58.000000000 -0700
+++ doc/invoke.texi     2006-10-16 16:01:19.000000000 -0700
@@ -470,7 +470,7 @@ Objective-C and Objective-C++ Dialects}.
 -twolevel_namespace  -umbrella  -undefined @gol
 -unexported_symbols_list  -weak_reference_mismatches @gol
 -whatsloaded -F -gused -gfull -mmacosx-version-min=@var{version} @gol
+-mkernel -mone-byte-bool}

 @emph{DEC Alpha Options}
 @gccoptlist{-mno-fp-regs  -msoft-float  -malpha-as  -mgas @gol
@@ -8074,6 +8074,16 @@ is @var{version}.  Typical values of @va
 The default for this option is to make choices that seem to be most

+@item -mkernel
+@opindex mkernel
+Enable kernel development mode.  The @option{-mkernel} sets
+@option{-static}, @option{-fno-common}, @option{-fno-cxa-atexit},
+@option{-fno-exceptions}, @option{-fno-non-call-exceptions},
+@option{-fapple-kext}, @option{-fno-weak} and @option{-fno-rtti} where
+applicable.  This mode also sets @option{-mno-altivec},
+@option{-msoft-float}, @option{-fno-builtin} and
+@option{-mlong-branch} for PowerPC targets.
 @item -mone-byte-bool
 @opindex -mone-byte-bool
 Override the defaults for @samp{bool} so that @samp{sizeof(bool)==1}.

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