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) <jsquy...@cisco.com>
wrote:
> On May 5, 2016, at 5:27 PM, Josh Hursey <jjhur...@open-mpi.org> 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
> jsquy...@cisco.com
> For corporate legal information go to:
> http://www.cisco.com/web/about/doing_business/legal/cri/
>
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> Link to this post:
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>
--
Paul H. Hargrove phhargr...@lbl.gov
Computer Languages & Systems Software (CLaSS) Group
Computer Science Department Tel: +1-510-495-2352
Lawrence Berkeley National Laboratory Fax: +1-510-486-6900
