Is there a reason we wouldn't disable it in OMPI's hwloc by default?
On Jun 8, 2011, at 5:14 PM, Josh Hursey wrote:
> In short, I haven't yet. I figured out the problem was in hwloc, and
> started with the hwloc branch by itself.
> In Open MPI, we should be able to pass the --disable-gcc-builtin from
> the main configure, right (since we pull in config/hwloc_internal.m4)?
> So we would pass it similar to how we had to pass --disable-xml to
> turn off that feature in the builtin hwloc (before it was turned off
> by default).
> -- Josh
> On Wed, Jun 8, 2011 at 4:50 PM, Jeff Squyres <jsquyres_at_[hidden]> wrote:
>> Josh --
>> How did you get this disabled from within OMPI? We don't invoke hwloc's configure via sub-shell; we directly invoke its m4, so we don't have an opportunity to pass --disable-gcc-builtin. Unless you passed that to the top-level OMPI configure script...?
>> On Jun 8, 2011, at 4:28 PM, Josh Hursey wrote:
>>> (This should have gone to the devel list)
>>> The attached patch adds a configure option (--disable-gcc-builtin) to
>>> disable the use of GCC __builtin_ operations, even if the GCC compiler
>>> supports them. The patch is a diff from the r3509 revision of the
>>> hwloc trunk.
>>> I hit a problem when installing hwloc statically on a machine with a
>>> slightly different gcc support libraries and OSs on the head/compile
>>> node versus the compute nodes. The builtin functions would cause hwloc
>>> to segfault when run on the compute nodes. By disabling the builtin
>>> operations, and using the more portable techniques seemed to do the
>>> This problem first became apparent when using hwloc as part of Open
>>> MPI. In Open MPI the mpirun process runs on the headnode, so the hwloc
>>> install would work in the mpirun process but cause the compute
>>> processes to segv.
>>> Can you review the patch, and apply it to the trunk? Once the patch is
>>> in the trunk, then I'll work on the Open MPI folks to update their
>>> Joshua Hursey
>>> Postdoctoral Research Associate
>>> Oak Ridge National Laboratory
>>> hwloc-users mailing list
>> Jeff Squyres
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> Joshua Hursey
> Postdoctoral Research Associate
> Oak Ridge National Laboratory
> hwloc-users mailing list
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