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Re: [lttng-dev] compile lttng get gcc compile error
- From: Mathieu Desnoyers <mathieu dot desnoyers at efficios dot com>
- To: Gerlando Falauto <gerlando dot falauto at keymile dot com>
- Cc: loody <miloody at gmail dot com>, gcc-help <gcc-help at gcc dot gnu dot org>, lttng-dev at lists dot lttng dot org
- Date: Wed, 14 May 2014 19:56:29 +0000 (UTC)
- Subject: Re: [lttng-dev] compile lttng get gcc compile error
- Authentication-results: sourceware.org; auth=none
- References: <CANudz+u_d54BtB9Fk3Vdtb8B7im_WMbK20jg_zUGeJ3wEPECMg at mail dot gmail dot com> <CAH6eHdSvfWjiZCLUNHaftnwjp_L56uSPwA=hTHpLAwiPhunfsA at mail dot gmail dot com> <CANudz+tzfc0cjBh=7Jm4TPvm7h33oyPaZdVGBjeuOrzgM8gimQ at mail dot gmail dot com> <53738341 dot 4030706 at keymile dot com>
----- Original Message -----
> From: "Gerlando Falauto" <gerlando.falauto@keymile.com>
> To: "loody" <miloody@gmail.com>
> Cc: "gcc-help" <gcc-help@gcc.gnu.org>, lttng-dev@lists.lttng.org
> Sent: Wednesday, May 14, 2014 10:52:49 AM
> Subject: Re: [lttng-dev] compile lttng get gcc compile error
>
> Hi loody,
> [originally posted to gcc-help, cross-posting to lttng-dev]
>
> On 03/27/2014 01:37 PM, loody wrote:
> > hi Jonathan:
> >
> > 2014-03-27 18:43 GMT+08:00 Jonathan Wakely <jwakely.gcc@gmail.com>:
> >> On 27 March 2014 10:32, loody wrote:
> >>> hi all
> >>> when I try to cross-compile lttng-tool for arm.
> >>> I get below message
> >>>
> >>> CC kernel-consumer.lo
> >>> kernel-consumer.c: In function 'lttng_kconsumer_snapshot_channel':
> >>> kernel-consumer.c:324:1: internal compiler error: in gen_movsi, at
> >>> config/arm/arm.md:5680
> >>>
> >>> my gcc version is 4.7.4
> >>
> >> I think this is http://gcc.gnu.org/PR58595 which will be fixed in GCC
> >> 4.9.0
> > is there any patch I can use to fix this issue before waiting 4.9.0
> > release?
> > or is there method I can avoid this compile happen if I rewrite the source?
> >
> > thanks a lot,
> >
>
> Did you ever find a workaround for such an issue? Perhaps by refactoring
> the code within lttng_kconsumer_snapshot_channel()?
A similar issue was experienced due to a gcc ARM bug. It only triggered
in O2 on specific gcc versions. I updated http://bugs.lttng.org/issues/640
with a suggested work around: compile lttng-tools in O1 if you cannot get
a fixed compiler.
Thanks,
Mathieu
>
> Thank you!
> Gerlando
>
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>
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com