[lttng-dev] [lttng-tools] build failure on armel (debian)

[Mathieu Desnoyers]

----- Original Message -----
> From: "Jon Bernard" <jbernard at debian.org>
> To: lttng-dev at lists.lttng.org
> Sent: Tuesday, May 6, 2014 11:14:03 AM
> Subject: [lttng-dev] [lttng-tools] build failure on armel (debian)
> 
> Hey guys,
> 
> This bug¹ was filed recently:
> 
>     your package no longer builds on the armel buildds:
>     https://buildd.debian.org/status/fetch.php?pkg=ltt-control&arch=armel&ver=2.4.1-1&stamp=1397064419
> 
>     >   CC       rculfhash.lo
>     > /tmp/ccBG89vh.s: Assembler messages:
>     > /tmp/ccBG89vh.s:1105: Error: selected processor does not support ARM
>     > mode `dmb'
>     > /tmp/ccBG89vh.s:1286: Error: selected processor does not support ARM
>     > mode `dmb'
>     > /tmp/ccBG89vh.s:3175: Error: selected processor does not support ARM
>     > mode `dmb'
>     > /tmp/ccBG89vh.s:3725: Error: selected processor does not support ARM
>     > mode `dmb'
>     > /tmp/ccBG89vh.s:3833: Error: selected processor does not support ARM
>     > mode `dmb'
>     > /tmp/ccBG89vh.s:3994: Error: selected processor does not support ARM
>     > mode `dmb'
>     > /tmp/ccBG89vh.s:4331: Error: selected processor does not support ARM
>     > mode `dmb'
>     > /tmp/ccBG89vh.s:5292: Error: selected processor does not support ARM
>     > mode `dmb'
>     > make[4]: *** [rculfhash.lo] Error 1
> 
> The public buildd that I can use to test this is unreachable at the
> moment, but maybe a solution can be reached without further debug info?
> 
> The build machine is ARMv7, which supports dmb IIUC, so I'm a bit
> puzzled on this one.
> 
> Any thoughts?

Perhaps the build itself has been changed to target ARMv6 ?

Starting with ARMv7, dmb should be there.

For ARMv6 support (and less), the Linux kernel provides
a vDSO page implementing __kuser_memory_barrier. If you
really need to build for ARMv6, this might be something
to look into.

I guess we'll need more information about your build
target.

Thanks,

Mathieu

> 
> ¹ https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=745891
> 
> --
> Jon
> 
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> 

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com