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Subject: Re: [OMPI users] Setting RPATH for Open MPI libraries
From: Reuti (reuti_at_[hidden])
Date: 2012-11-11 17:11:59


Am 05.11.2012 um 04:41 schrieb Jed Brown:

> Jeff, we are averaging a half dozen support threads per week on PETSc lists/email caused by lack of RPATH in Open MPI for non-standard install locations. Can you either make the necessary environment modification more visible for novice users or implement the RPATH option?

I have another question here. It could be fixed by specifying before the compilation with `mpicc`:

export OMPI_LDFLAGS="-Wl,-rpath,/home/reuti/local/openmpi-1.6.3_shared_gcc/lib"

But this doesn't work, as the original included -L argument is removed in the call to the linker then. Instead both need to be included:

export OMPI_LDFLAGS="-L/home/reuti/local/openmpi-1.6.3_shared_gcc/lib -Wl,-rpath,/home/reuti/local/openmpi-1.6.3_shared_gcc/lib"

Then it works again and the RPATH is included. Why is the necessary -L argument removed by the wrapper during compilation if OMPI_LDFLAGS for additonal flags is used?

-- Reuti

> On Wed, Sep 12, 2012 at 1:52 PM, Jed Brown <jed_at_[hidden]> wrote:
> On Wed, Sep 12, 2012 at 10:20 AM, Jeff Squyres <jsquyres_at_[hidden]> wrote:
> We have a long-standing philosophy that OMPI should add the bare minimum number of preprocessor/compiler/linker flags to its wrapper compilers, and let the user/administrator customize from there.
> In general, I agree with that philosophy.
> That being said, a looong time ago, I started a patch to add a --with-rpath option to configure, but never finished it. :-\ I can try to get it back on my to-do list.
> That would be perfect.
> For the moment, you might want to try the configure --enable-mpirun-prefix-by-default option, too.
> The downside is that we tend not to bother with the mpirun for configure and it's a little annoying to "mpirun ldd" when hunting for other problems (e.g. a missing shared lib unrelated to Open MPI).
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