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Subject: Re: [hwloc-users] Patch to disable GCC __builtin_ operations
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2011-06-08 16:50:26


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
> trick.
>
> 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
> revision.
>
> Thanks,
> Josh
>
> --
> Joshua Hursey
> Postdoctoral Research Associate
> Oak Ridge National Laboratory
> http://users.nccs.gov/~jjhursey
> <hwloc-diff-r3509.diff>_______________________________________________
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> hwloc-users_at_[hidden]
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-- 
Jeff Squyres
jsquyres_at_[hidden]
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