linux-kernel - Re: [regressions] Re: kbuild: save ARCH & CROSS

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Date:	Fri, 9 Oct 2009 11:23:52 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [regressions] Re: kbuild: save ARCH & CROSS_COMPILE when
	building a kernel


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Sat, 2009-10-03 at 12:34 +0200, Ingo Molnar wrote:
> > 
> > that arch-cache thing introduced in:
> > 
> >  5755433: kbuild: save ARCH & CROSS_COMPILE when building a kernel
> > 
> > isnt working very well in my experience.
> 
> Its breaking things for me too. When I build a .config using distcc 
> and cross compilers on my build farm, and then try a make install on 
> another machine which doesn't have either it utterly shits itself.
> 
> Please revert this.

I'm hitting problems with this several times a day.

I'm used to switching from 32-bit to 64-bit x86 kernels and now i have 
to via the extra 'make mrproper' and that's quite annoying as i already 
tell kbuild that i want a 64-bit config via:

  make ARCH=x86_64 defconfig

Why the extra forced step?

Also, there's things that need even more steps: i often take a config 
that triggers a breakage on 32-bit and change it to 64-bit via 'make 
oldconfig' - to see whether the bug is bitness invariant. I have to do 
something like:

  mv .config .config.tmp
  make mrproper
  mv .config.tmp .config
  make ARCH=x86_64 oldconfig

This doesnt look right at all.

	Ingo
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