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Date: Tue, 14 Dec 2004 11:58:47 -0800 (PST)
From: Linus Torvalds <torvalds@osdl.org>
To: Sam Ravnborg <sam@ravnborg.org>
cc: Horst von Brand <vonbrand@inf.utfsm.cl>,
       Werner Almesberger <wa@almesberger.net>,
       Paul Mackerras <paulus@samba.org>, Greg KH <greg@kroah.com>,
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       David Howells <dhowells@redhat.com>, hch@infradead.org,
       aoliva@redhat.com, linux-kernel@vger.kernel.org,
       libc-hacker@sources.redhat.com
Subject: Re: [RFC] Splitting kernel headers and deprecating __KERNEL__
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On Tue, 14 Dec 2004, Sam Ravnborg wrote:
> 
> Today we only pull in stdarg.h from userspace - actually a compiler
> dependent file.

Indeed. You'll notice that gcc doesn't even put stdarg.h in /usr/include, 
it's in the compiler-specific header file directory, usually something 
like /usr/lib/gcc-lib/<vendor>/<version>/include.

We used to compile with "-nostdinc" to make sure that you couldn't include 
user files even by mistake, but that was removed for some reason I can't 
for the life of me remember any more.

We probably should do it again. Something vaguely like

	CFLAGS += -nostdinc -I $(CC -print-file-name=include)

should do it (and still pick up "stdarg.h").

		Linus