Thanks
I think I would be fine with that fix. Unfortunately I won't have a good
internet access until sunday night. I won't be able to test anything
properly earlier :/
Le 06/05/2016 00:29, Paul Hargrove a écrit :
> I have some good news: I have a fix!!
>
> FWIW: I too can build w/ xlc 12.1 (also BG/Q).
> It is just the 13.1.0 on Power7 that crashes building hwloc.
> Meanwhile, 13.1.2 on Power8 little-endian does not crash (but is a
> different front-end than big-endian if I understand correctly).
>
> I started "bisecting" the file topology-xml-nolibxml.c and found that
> xlc is crashing on "__hwloc_attribute_may_alias".
> Simply disabling use of that attribute resolves the problem.
>
> So, here is the fix, which simply changes the check for this attribute
> to match the way in which hwloc uses it.
> It disqualifies the buggy compiler version(s) based on behavior,
> rather than us trying to list affected versions.
>
> --- config/hwloc_check_attributes.m4~ 2016-05-05 17:18:10.380479303
> -0500
> +++ config/hwloc_check_attributes.m4 2016-05-05 17:21:30.399799031
> -0500
> @@ -322,9 +322,10 @@
> # Attribute may_alias: No suitable cross-check available, that
> works for non-supporting compilers
> # Ignored by intel-9.1.045 -- turn off with -wd1292
> # Ignored by PGI-6.2.5; ignore not detected due to missing
> cross-check
> + # The test case is chosen to match hwloc's usage, and reproduces
> an xlc-13.1.0 bug.
> #
> _HWLOC_CHECK_SPECIFIC_ATTRIBUTE([may_alias],
> - [int * p_value __attribute__ ((__may_alias__));],
> + [struct { int i; } __attribute__ ((__may_alias__)) * p_value;],
> [],
> [])
>
>
> -Paul [proving that I am good for more than just *breaking* other
> people's software - I can fix things too]
>
> On Thu, May 5, 2016 at 2:28 PM, Jeff Squyres (jsquyres)
> <[email protected] <mailto:[email protected]>> wrote:
>
> On May 5, 2016, at 5:27 PM, Josh Hursey <[email protected]
> <mailto:[email protected]>> wrote:
> >
> > Since this also happens with hwloc 1.11.3 standalone maybe hwloc
> folks can take point on further investigation?
>
> I think Brice would love your assistance in figuring this out,
> since I'm guessing he doesn't have access to these platforms,
> either. :-)
>
> --
> Jeff Squyres
> [email protected] <mailto:[email protected]>
> For corporate legal information go to:
> http://www.cisco.com/web/about/doing_business/legal/cri/
>
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>
>
>
>
> --
> Paul H. Hargrove [email protected]
> <mailto:[email protected]>
> Computer Languages & Systems Software (CLaSS) Group
> Computer Science Department Tel: +1-510-495-2352
> Lawrence Berkeley National Laboratory Fax: +1-510-486-6900
