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Subject: Re: [hwloc-users] hwloc-1.6.1rc2 Build failure with Cray compiler
From: Erik Schnetter (schnetter_at_[hidden])
Date: 2013-01-17 14:15:08


I have no idea how fast Cray acts in such a case.

-erik

On Thu, Jan 17, 2013 at 2:05 PM, Brice Goglin <brice.goglin_at_[hidden]> wrote:

> Does Cray fix such bugs quickly usually? If so, no need to change hwloc.
> If not, I'll need somebody to test the change on other cray platforms and
> compiler versions.
> Brice
>
>
>
> Jeff Hammond <jhammond_at_[hidden]> a écrit :
>>
>> This is a bug in the Cray compiler. They cannot and should not set
>> the __GNUC__ flag unless they are fully compatible with GCC. There
>> are many ways to define "fully compatible" but at a minimum, code that
>> compiles with GCC needs to compile with any compiler that elects to
>> define __GNUC__. It is prudent to impose a higher standard in some
>> cases but that's not pertinent to this discussion.
>>
>> Lots of vendor compilers pretend to be __GNUC__ for any number of
>> reasons. I believe that they are all wrong for doing it.
>>
>> Regarding this specific issue, there is nothing wrong with hwloc and I
>> don't know why anyone should bother trying to fix Cray's problem, but
>> I suspect that pragmatism will prevail, as it appears to have in the
>> case of Boost (http://www.boost.org/doc/libs/1_52_0/boost/config/select_platform_config.hpp).
>>
>> I'll reproduce this locally and contact Cray directly about fixing
>> this on their end.
>>
>> Best,
>>
>> Jeff
>>
>> On Thu, Jan 17, 2013 at 12:19 PM, Erik Schnetter <schnetter_at_[hidden]> wrote:
>>
>>> hwloc-1.6.1rc2 fails to build with the Cray compiler
>>>
>>> Cray C : Version 8.1.2 Thu Jan 17, 2013 12:18:54
>>>
>>> The error message is
>>>
>>> CC bitmap.lo
>>> CC-147 craycc: ERROR
>>> Declaration is incompatible with "int ffsl(long)" (declared at line 526 of
>>> "/opt/cray/xe-sysroot/4.1.20/usr/include/string.h").
>>>
>>> (Yes, there is no line number with the error message.)
>>>
>>> This seems to be caused by the fact that the Cray c!
>>> ompiler
>>> sets __GNUC__,
>>>
>>> but is not quite compatible. A work-around is to change line 56 of
>>> include/private/misc.h from
>>>
>>> #elif defined(__GNUC__)
>>>
>>> to
>>>
>>> #elif defined(__GNUC__) && !defined(_CRAYC)
>>>
>>> -erik
>>>
>>> --
>>> Erik Schnetter <schnetter_at_[hidden]>
>>> http://www.perimeterinstitute.ca/personal/eschnetter/
>>>
>>> ------------------------------
>>>
>>> hwloc-users mailing list
>>> hwloc-users_at_[hidden]
>>> http://www.open-mpi.org/mailman/listinfo.cgi/hwloc-users
>>>
>>
>>
>>
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-- 
Erik Schnetter <schnetter_at_[hidden]>
http://www.perimeterinstitute.ca/personal/eschnetter/