linux-kernel - Re: [m68k] in modpost: "strlen" [iscsi_target

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Date:	Sun, 1 Jan 2012 23:45:51 +0000 (UTC)
From:	Thorsten Glaser <tg@...bsd.de>
To:	Jonathan Nieder <jrnieder@...il.com>
cc:	Nicholas Bellinger <nab@...ux-iscsi.org>,
	Greg Ungerer <gerg@...inux.org>, linux-kernel@...r.kernel.org,
	linux-m68k@...r.kernel.org, target-devel@...r.kernel.org
Subject: Re: [m68k] in modpost: "strlen" [iscsi_target_mod.ko] undefined!
 (and others)

Jonathan Nieder dixit:

>Could you suggest a patch to arch/m68k/Makefile to do that?

No, I patched it in debian/config/m68k/defines instead.

I’d rather know why upstream doesn’t use -ffreestanding on
_all_ architectures. A kernel is _not_ a hosted environment,
and GCC is right to bring in problems like this.

>    Then drop -ffreestanding from the main Makefile because it isn't
>    needed anymore and implies -fno-builtin, which is wrong now.

This is wrong, GCC builtins are only valid on hosted platforms,
not on freestanding platforms. (Nobody prevents GCC from using
a memcpy builtin that uses, say, SSE instructions, which must
not be used inside kernel code, for an example on a better-known
architecture.) A kernel must always be compiled freestanding,
as do bootloaders. At least since the advent of gcc 3.[34].

bye,
//mirabilos
-- 
“It is inappropriate to require that a time represented as
 seconds since the Epoch precisely represent the number of
 seconds between the referenced time and the Epoch.”
	-- IEEE Std 1003.1b-1993 (POSIX) Section B.2.2.2
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