[lttng-dev] liburcu sparc support, build failure on buildd

[Richard Thornton]

I support linux on x86 hardware, but on my old Sun blade 100, the only open
source OS which consistently installs and runs properly is openbsd for
sparc.  I must have tried 100 times to get linux to work but it does not
work with the rage xl video board and i am not a patient guy.;  openbsd
does.



On Fri, Feb 22, 2013 at 3:42 PM, Patrick Baggett
<baggett.patrick at gmail.com>wrote:

>
>
> On Fri, Feb 22, 2013 at 8:15 AM, Mathieu Desnoyers <
> mathieu.desnoyers at efficios.com> wrote:
>
>> Hi,
>>
>> I notice the following build failure here
>>
>> https://buildd.debian.org/status/package.php?p=liburcu
>>
>> Tail of log for liburcu on sparc:
>>
>> urcu/static/wfqueue.h:84:2: warning: implicit declaration of function
>> 'CMM_STORE_SHARED' [-Wimplicit-function-declaration]
>> urcu/static/wfqueue.h: In function '___cds_wfq_node_sync_next':
>> urcu/static/wfqueue.h:99:2: warning: implicit declaration of function
>> 'CMM_LOAD_SHARED' [-Wimplicit-function-declaration]
>> urcu/static/wfqueue.h:99:15: warning: assignment makes pointer from
>> integer without a cast [enabled by default]
>> urcu/static/wfqueue.h:104:4: warning: implicit declaration of function
>> 'caa_cpu_relax' [-Wimplicit-function-declaration]
>> urcu/static/wfqueue.h: In function '___cds_wfq_dequeue_blocking':
>> urcu/static/wfqueue.h:126:55: warning: comparison between pointer and
>> integer [enabled by default]
>> make[3]: *** [wfqueue.lo] Error 1
>> make[3]: Leaving directory
>> `/build/buildd-liburcu_0.7.6-1-sparc-GySyug/liburcu-0.7.6'
>> make[2]: *** [all-recursive] Error 1
>> make[2]: Leaving directory
>> `/build/buildd-liburcu_0.7.6-1-sparc-GySyug/liburcu-0.7.6'
>> make[1]: *** [all] Error 2
>> make[1]: Leaving directory
>> `/build/buildd-liburcu_0.7.6-1-sparc-GySyug/liburcu-0.7.6'
>> dh_auto_build: make -j1 returned exit code 2
>> make: *** [build-arch] Error 2
>>
>> One main question I have: what sparc architectures are supported by
>> Debian's "sparc" architecture ? Userspace RCU only supports Sparcv9 and
>> onward, because it requires some atomic instructions.
>>
>>
> Debian definitely only supports[1] SPARCv9 compatible CPUs (sun4u, sun4v).
> I've heard that Linux on 32-bit SPARC (i.e. sparc <= v8) is shoddy now, but
> I certainly haven't tried it.
>
> [1] http://www.debian.org/ports/sparc/
>
> As documented in the urcu README file, building a package that includes
>> sparcv9 isntructions for 32-bit sparc can be done with:
>>
>> CFLAGS="-m32 -Wa,-Av9a -g -O2" ./configure
>>
>
> "v9a" includes VIS instruction set, which is an extension of SPARCv9. I
> think only some early Fujitsu SPARC CPUs (pre 2000) are missing it -- the
> original UltraSPARC from Sun does include it. Probably safe to turn on, but
> technically extends requirements to use the program.
>
>
>>
>> But if Debian sparc needs to support pre-v9 sparcs, then I guess it
>> would not be appropriate to use v9 instructions for urcu sparc build.
>>
>> Thoughts ?
>>
>> Thanks,
>>
>> Mathieu
>>
>> --
>> Mathieu Desnoyers
>> EfficiOS Inc.
>> http://www.efficios.com
>>
>>
>> --
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>> listmaster at lists.debian.org
>> Archive: http://lists.debian.org/20130222141551.GB22156@Krystal
>>
>>
>
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