linux-kernel - Re: RFC: drop support for gcc

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Date:	Tue, 21 Aug 2007 18:54:53 +0100
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jarek Poplawski <jarkao2@...pl>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: RFC: drop support for gcc < 4.0

On Tue, Aug 21, 2007 at 07:35:50PM +0200, Adrian Bunk wrote:
> On Tue, Aug 21, 2007 at 09:31:03AM -0700, Randy Dunlap wrote:
> > On Tue, 21 Aug 2007 15:20:38 +0200 Jarek Poplawski wrote:
> > 
> > > Here are some more of, probably well-known, warnings with attached
> > > testing-only .config.
> > >...
> > > drivers/pci/msi.c:686: warning: weak declaration of `arch_msi_check_device' after first use results in unspecified behavior
> > > drivers/pci/msi.c:698: warning: weak declaration of `arch_setup_msi_irqs' after first use results in unspecified behavior
> > > drivers/pci/msi.c:718: warning: weak declaration of `arch_teardown_msi_irqs' after first use results in unspecified behavior
> > >...
> > 
> > What gcc version?  I don't get the arch_ warnings in drivers/pci/msi.c.
> 
> Obviously a gcc <= 3.4 [1], and therefore no unit-at-a-time.
> 
> You can reproduce it with a more recent gcc when adding 
> -fno-unit-at-a-time to the CFLAGS.
> 
> And it's becoming a real maintainance problem that not only this problem 
> but also other problems like some section mismatches [2] are only 
> present without unit-at-a-time.
> 
> Currently we support 6 different stable gcc release series, and it might 
> be the right time to consider dropping support for the older ones.
> 
> Are there any architectures still requiring a gcc < 4.0 ?

I want to keep support for gcc 3.4.3 for ARM for the forseeable future.
>From my point of view, gcc 4 compilers have been something of a development
thing as far as the ARM architecture goes.  Also, gcc 3.4.3 is faster and
significantly less noisy than gcc 4.

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