Hi Jeff and Reuti, thank you for your responds.
"ldd hello_cxx" gave me some clue, and I found it was linked to some mpich library which was installed under/usr/lib64. When I removed mpich libraries, and recompile, everything includes mpicc and mpirun worked fine.
I didn't have that problem with eariler openmpi versions like 1.6.x and 1.5.x. I would like to keep mpich libraries on the system, is there any confiure option I can use to make 1.6.4 library link the same as 1.6.3?
On Mar 7, 2013, at 9:31 AM, Reuti <email@example.com> wrote:Also, what's the output if you use --showme? I'd like to see the underlying command that is being used.
>> [root@tesla examples]# echo $LD_LIBRARY_PATH
>> [root@tesla examples]# which mpicc
>> [root@tesla examples]# mpicc -o hello_c hello_c.c
>> /tmp/ccuZg1I9.o: In function `main':
>> hello_c.c:(.text+0x1d): undefined reference to `ompi_mpi_comm_world'
>> hello_c.c:(.text+0x2b): undefined reference to `ompi_mpi_comm_world'
> What is the output if you compile in addition with -v (verbose)?
When you successfully compile/link hello_cxx, what does "ldd hello_cxx" show?
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