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From: Paul Mackerras <paulus@samba.org>
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Date: Thu, 3 Jan 2002 21:49:32 +1100 (EST)
To: Bernard Dautrevaux <Dautrevaux@microprocess.com>
Cc: "'Tom Rini'" <trini@kernel.crashing.org>, jtv <jtv@xs4all.nl>,
        Richard Henderson <rth@redhat.com>, Momchil Velikov <velco@fadata.bg>,
        linux-kernel@vger.kernel.org, gcc@gcc.gnu.org,
        linuxppc-dev@lists.linuxppc.org,
        Franz Sirl <Franz.Sirl-kernel@lauterbach.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Corey Minyard <minyard@acm.org>
Subject: RE: [PATCH] C undefined behavior fix
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Bernard Dautrevaux writes:

> OH... are you saying that the Linux kernel is not writtent in ANSI C? AFAICR

No, in fact the kernel isn't written in ANSI C. :)
If nothing else, the fact that it uses a lot of gcc-specific
extensions rules that out.  And it assumes that you can freely cast
pointers to unsigned longs and back again.  I'm sure others can add to
this list.

> the standard *requires* that the standard library functions have their
> standard meaning. So if the Linux kernel expects them to have some special
> meaning it is *non-conforming* and then you need a *special* compiler,
> understanding this.

Sure the kernel is non-conforming.  "Conforming" means that the
program will run the same on any architecture, and the Linux kernel
surely won't do that - it won't get very far on a PDP-10, I can assure
you. :)

Paul.
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