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Subject: Re: [OMPI users] openmpi-1.6.4 mpicc fails to compile hello_c.c
From: Limin Gu (lgu_at_[hidden])
Date: 2013-03-07 17:24:31


On Thu, Mar 7, 2013 at 4:01 PM, Jeff Squyres (jsquyres)
<jsquyres_at_[hidden]>wrote:

>
> This doesn't sound right -- I don't think we changed how linking worked in
> 1.6.3 and 1.6.4.
>
> Are you sure that, on that same machine with MPICH installed in
> /usr/lib64, you're also able to compile/link/use 1.6.3 properly?
>

Yes, on the same system, 1.6.3 openmpi works with MPICH installed in
/usr/lib64

>
> A wild guess: you have some kind of linker configuration that is putting
> /usr/lib64 ahead of -L-specified paths on the compiler command line.
>
> On the same system,
with 1.6.3:
[root_at_tesla examples]# mpicc --showme hello_c.c
gcc hello_c.c -I/opt/scyld/openmpi/1.6.3/gnu/include -pthread
-L/opt/scyld/openmpi/1.6.3/gnu/lib -lmpi -libverbs -ldat -lrt -lnsl -lutil
-lm -ltorque -lm -lnuma -lrt -lnsl -lutil -lm
[root_at_tesla examples]#

With 1.6.4:
[root_at_tesla examples]# mpicc --showme hello_c.c
gcc hello_c.c -I/opt/scyld/openmpi/1.6.4/gnu/include -pthread -L/usr/lib64
-Wl,-rpath -Wl,/usr/lib64 -L/opt/scyld/openmpi/1.6.4/gnu/lib -lmpi
-libverbs -ldat -lrt -lnsl -lutil -lm -ltorque -lm -lnuma -lrt -lnsl -lutil
-lm
[root_at_tesla examples]#

So indeed, for 1.6.4, the linker is putting /usr/lib64 ahead of openmpi
library path, but I don't know why.
I used the same configure options when I did these builds. I didn't change
linker configuration from 1.6.3 to 1.6.4 either, the only difference I can
tell is the openmpi source code.

Thank you!

Limin

--
> Jeff Squyres
> jsquyres_at_[hidden]
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