linux-kernel - Re: Build regressions/improvements in v4.3-rc3

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Message-ID: <20150928094836.GU21513@n2100.arm.linux.org.uk>
Date:	Mon, 28 Sep 2015 10:48:36 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>
Subject: Re: Build regressions/improvements in v4.3-rc3

On Mon, Sep 28, 2015 at 10:30:06AM +0100, Russell King - ARM Linux wrote:
> On Mon, Sep 28, 2015 at 08:57:44AM +0200, Geert Uytterhoeven wrote:
> > On Sun, Sep 27, 2015 at 9:34 PM, Geert Uytterhoeven
> > <geert@...ux-m68k.org> wrote:
> > > JFYI, when comparing v4.3-rc3[1] to v4.3-rc2[3], the summaries are:
> > >   - build errors: +8/-12
> > 
> >   + error: No rule to make target include/config/auto.conf:  => N/A
> > 
> > arm-randconfig
> 
> Not every randconfig failure is a kernel problem.  Here's an example:
> 
> Physical address of main memory (PHYS_OFFSET) [] (NEW) aborted!
> 
> Console input/output is redirected. Run 'make oldconfig' to update configuration.
> 
> This needs someone to provide a value, which means these failures are
> not in fact failures of the kernel, but a failure of the build system
> to anticipate that there may be Kconfig questions that need input.
> 
> So, these ones should be ignored.

Also, a great many of the failures are due to the build toolchain not
supporting -fstack-protector-strong.  I think it's absolutely right
for the build to error out if you enable a kernel feature which requires
toolchain support, but the toolchain does not support that feature.

What this means is that the build results from kissb are less than
useful - without spending ages looking at every single build, it's
hard to find the real failures we care about.

I'd suggest that either the randconfig is seeded to ensure that
CONFIG_CC_STACKPROTECTOR_STRONG is always disabled in ARM randconfigs,
or that the ARM toolchain is updated to support this feature.

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