* Minimum toolchain requirements?
@ 2012-12-14 22:25 Rob Landley
2012-12-27 20:09 ` Shaun Ruffell
0 siblings, 1 reply; 4+ messages in thread
From: Rob Landley @ 2012-12-14 22:25 UTC (permalink / raw)
To: linux-kernel, linux-doc, torvalds
Although the README and Documentation/Changes both say the kernel
builds with gcc 3.2, this is no loner the case. In reality the new 3.7
kernel no longer builds under unpatched gcc 4.2.1 (the last GPLv2
release).
Building for i686 breaks with "arch/x86/kernel/cpu/perf_event_p6.c:22:
error: p6_hw_cache_event_ids causes a section type conflict" (trivial
workaround: patch kernel so CONFIG_BROKEN_RODATA defaults to y).
Building for mips breaks with "arch/mips/lib/delay.c:24:5: warning:
"__SIZEOF_LONG__" is not defined". (Introduced January 2007, gcc git
commit 6a60f216c210e. Easy enough to add an equivalent to my toolchain.)
Over in my Aboriginal Linux project I've been patching both the kernel
and my GPLv2 toolchain for a while to work around these random
breakages (such as when sh4 decided it would only build with binutils
2.20, which had only been out for 3 months at the time). But since I'm
supposed to be catching Documentation stuff that falls through the
cracks, if the docs are clearly out of date I should probably update
them.
I'm still regression testing each new kernel release against gcc 4.2.1,
binutils 2.17, and make 3.81 (I.E. the last GPLv2 release of each
tool). My personal preference would be to upgrade Documentation/Changes
to say "gcc 4.2.1 and binutils 2.17 are the oldest supported versions",
and then try to push patches upstream that prevent the kernel from
building on those. Unfortunately, when I try to push patches to make
older toolchains work, the reception isn't exactly warm.
So I ask the question: what are the current minimum requirements to
build the kernel?
Rob
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Minimum toolchain requirements?
2012-12-14 22:25 Minimum toolchain requirements? Rob Landley
@ 2012-12-27 20:09 ` Shaun Ruffell
2012-12-28 3:35 ` Rob Landley
0 siblings, 1 reply; 4+ messages in thread
From: Shaun Ruffell @ 2012-12-27 20:09 UTC (permalink / raw)
To: Rob Landley; +Cc: linux-kernel
Hi Rob,
On Fri, Dec 14, 2012 at 04:25:10PM -0600, Rob Landley wrote:
> Although the README and Documentation/Changes both say the kernel
> builds with gcc 3.2, this is no loner the case. In reality the new
> 3.7 kernel no longer builds under unpatched gcc 4.2.1 (the last
> GPLv2 release).
>
> Building for i686 breaks with
> "arch/x86/kernel/cpu/perf_event_p6.c:22: error:
> p6_hw_cache_event_ids causes a section type conflict" (trivial
> workaround: patch kernel so CONFIG_BROKEN_RODATA defaults to y).
I came across your email while searching for a solution to the above
build error.
In addition to setting CONFIG_BROKEN_RODATA=y, Jan Beulich sent a
patch [1] to LKML that also fixes this build problem for me.
[1] https://lkml.org/lkml/2012/11/23/308
It doesn't appear to have hit Linus' tree yet though, but with luck
someone will pick it up before 3.8 final.
Cheers,
Shaun
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Minimum toolchain requirements?
2012-12-27 20:09 ` Shaun Ruffell
@ 2012-12-28 3:35 ` Rob Landley
2013-01-14 19:29 ` Greg KH
0 siblings, 1 reply; 4+ messages in thread
From: Rob Landley @ 2012-12-28 3:35 UTC (permalink / raw)
To: Shaun Ruffell; +Cc: linux-kernel, stable
On 12/27/2012 02:09:33 PM, Shaun Ruffell wrote:
> Hi Rob,
>
> On Fri, Dec 14, 2012 at 04:25:10PM -0600, Rob Landley wrote:
> > Although the README and Documentation/Changes both say the kernel
> > builds with gcc 3.2, this is no loner the case. In reality the new
> > 3.7 kernel no longer builds under unpatched gcc 4.2.1 (the last
> > GPLv2 release).
> >
> > Building for i686 breaks with
> > "arch/x86/kernel/cpu/perf_event_p6.c:22: error:
> > p6_hw_cache_event_ids causes a section type conflict" (trivial
> > workaround: patch kernel so CONFIG_BROKEN_RODATA defaults to y).
>
> I came across your email while searching for a solution to the above
> build error.
>
> In addition to setting CONFIG_BROKEN_RODATA=y, Jan Beulich sent a
> patch [1] to LKML that also fixes this build problem for me.
>
> [1] https://lkml.org/lkml/2012/11/23/308
>
> It doesn't appear to have hit Linus' tree yet though, but with luck
> someone will pick it up before 3.8 final.
>
> Cheers,
> Shaun
Having it in 3.7.x would be nice too. Copying stable.
Thanks,
Rob
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Minimum toolchain requirements?
2012-12-28 3:35 ` Rob Landley
@ 2013-01-14 19:29 ` Greg KH
0 siblings, 0 replies; 4+ messages in thread
From: Greg KH @ 2013-01-14 19:29 UTC (permalink / raw)
To: Rob Landley; +Cc: Shaun Ruffell, linux-kernel, stable
On Thu, Dec 27, 2012 at 09:35:27PM -0600, Rob Landley wrote:
> On 12/27/2012 02:09:33 PM, Shaun Ruffell wrote:
> >Hi Rob,
> >
> >On Fri, Dec 14, 2012 at 04:25:10PM -0600, Rob Landley wrote:
> >> Although the README and Documentation/Changes both say the kernel
> >> builds with gcc 3.2, this is no loner the case. In reality the new
> >> 3.7 kernel no longer builds under unpatched gcc 4.2.1 (the last
> >> GPLv2 release).
> >>
> >> Building for i686 breaks with
> >> "arch/x86/kernel/cpu/perf_event_p6.c:22: error:
> >> p6_hw_cache_event_ids causes a section type conflict" (trivial
> >> workaround: patch kernel so CONFIG_BROKEN_RODATA defaults to y).
> >
> >I came across your email while searching for a solution to the above
> >build error.
> >
> >In addition to setting CONFIG_BROKEN_RODATA=y, Jan Beulich sent a
> >patch [1] to LKML that also fixes this build problem for me.
> >
> >[1] https://lkml.org/lkml/2012/11/23/308
> >
> >It doesn't appear to have hit Linus' tree yet though, but with luck
> >someone will pick it up before 3.8 final.
> >
> >Cheers,
> >Shaun
>
> Having it in 3.7.x would be nice too. Copying stable.
Please let stable@vger.kernel.org know the git commit id in Linus's tree
when it makes it there, and we can take it. Until then, nothing we can
do, sorry.
greg k-h
^ permalink raw reply [flat|nested] 4+ messages in thread
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2012-12-14 22:25 Minimum toolchain requirements? Rob Landley
2012-12-27 20:09 ` Shaun Ruffell
2012-12-28 3:35 ` Rob Landley
2013-01-14 19:29 ` Greg KH
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