Date: Thu, 23 Mar 2006 17:40:14 +0000
From: Russell King <rmk+lkml@arm.linux.org.uk>
To: Arjan van de Ven <arjan@infradead.org>, linux-kernel@vger.kernel.org,
       Jeff Garzik <jgarzik@pobox.com>, Andrew Morton <akpm@osdl.org>
Subject: Re: 2.6.16-git6: build failure: ne2k-pci: footbridge_defconfig
Message-ID: <20060323174014.GF25849@flint.arm.linux.org.uk>
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	linux-kernel@vger.kernel.org, Jeff Garzik <jgarzik@pobox.com>,
	Andrew Morton <akpm@osdl.org>
References: <20060323164109.GD25849@flint.arm.linux.org.uk> <1143132732.3147.33.camel@laptopd505.fenrus.org> <20060323165558.GE25849@flint.arm.linux.org.uk>
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On Thu, Mar 23, 2006 at 04:55:58PM +0000, Russell King wrote:
> On Thu, Mar 23, 2006 at 05:52:12PM +0100, Arjan van de Ven wrote:
> > On Thu, 2006-03-23 at 16:41 +0000, Russell King wrote:
> > > Building the ARM footbridge_defconfig provokes this build error:
> > > 
> > >   CC      drivers/net/ne2k-pci.o
> > > drivers/net/ne2k-pci.c:123: error: pci_clone_list causes a section type conflict
> > > make[2]: *** [drivers/net/ne2k-pci.o] Error 1
> > > make[1]: *** [drivers/net] Error 2
> > > make: *** [drivers] Error 2
> > > make: Leaving directory `/var/tmp/kernel-orig'
> > > 
> > > static const struct {
> > >         char *name;
> > >         int flags;
> > > } pci_clone_list[] __devinitdata = {
> > > 
> > > const data can't be __devinitdata.
> > 
> > 
> > that's a gcc bug; probably arm specific even?
> 
> It's gcc 4.01... the kautobuild folk are going to try gcc 4.04 instead.

Actually, given that it also appears with gcc 3.3, I'd like to request
that the change (along with all the other const __devinitdata's) are
backed out.

The comments I'm hearing about gcc 4.1 on ARM indicate that it's a case
of "there be big beasts there, don't touch with a barge pole".  To quote
some comments about gcc 4.1 on ARM:

"yeah, 4.1 is quite bad on arm.  it's supposed to have all the EABI bits,
 but it can't even build itself without ICEing and segfaulting left right
 and center"

"the debian arm failures with gcc 4.1 are just scary.  the current gcc
 4.1s miscompile even very basic for/while loops"

which probably leaves ARM folk with a very narrow set of working gcc
versions.

So, I've no idea at present which gcc version we should be considering
nominating as "the sole gcc version the kernel supports".

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core
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