linux-kernel - Re: [RFC] minimum gcc version for kernel: raise to gcc-4.3 or 4.6?

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Date:   Tue, 20 Dec 2016 10:59:20 +0100
From:   Heiko Carstens <heiko.carstens@...ibm.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Sebastian Andrzej Siewior <sebastian@...akpoint.cc>,
        linux-arch@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...r.kernel.org,
        Russell King <rmk+kernel@...linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kernel-build-reports@...ts.linaro.org,
        kvmarm@...ts.cs.columbia.edu,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [RFC] minimum gcc version for kernel: raise to gcc-4.3 or 4.6?

On Fri, Dec 16, 2016 at 11:00:27PM +0100, Arnd Bergmann wrote:
> On Friday, December 16, 2016 6:00:43 PM CET Sebastian Andrzej Siewior wrote:
> > On 2016-12-16 11:56:21 [+0100], Arnd Bergmann wrote:
> > > The original gcc-4.3 release was in early 2008. If we decide to still
> > > support that, we probably want the first 10 quirks in this series,
> > > while gcc-4.6 (released in 2011) requires none of them.
> > 
> > It this min gcc thingy ARM only?
> 
> This is part of the question that I'm trying to figure out myself.
> 
> Clearly having the same minimum version across all architectures simplifies
> things a lot, because many of the bugs in old versions are architecture
> independent. Then again, some architectures implicitly require a new version
> because an old one never existed (e.g. arm64 or risc-v), while some other
> architectures may require an old version.

FWIW, s390 requires gcc 4.3 or newer since two years already. For older
compilers we enforce a compile error (see arch/s390/kernel/asm-offsets.c).