Hi,
I have successfully built Open MPI version 2.1.3 from scratch in Ubuntu 14.04 64 bit and using GCC 4.9. The result was the following shared libraries (needed for a program to use Open MPI):
dummy@machine:~/$ ldd /home/dummy/openmpi/build/lib/libmpi.so /home/dummy/openmpi/build/lib/libopen-rte.so /home/dummy/openmpi/build/lib/libopen-pal.so
/home/dummy/openmpi/build/lib/libmpi.so:
linux-vdso.so.1 => (0x00007ffecfb87000)
libopen-rte.so.20 => not found
libopen-pal.so.20 => not found
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fcc99058000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fcc98d51000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fcc98b33000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fcc9876a000)
/lib64/ld-linux-x86-64.so.2 (0x00005574ed2b8000)
/home/dummy/openmpi/build/lib/libopen-rte.so:
linux-vdso.so.1 => (0x00007ffc99743000)
libopen-pal.so.20 => not found
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007ff6f498f000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007ff6f45c6000)
/lib64/ld-linux-x86-64.so.2 (0x00005622db738000)
/home/dummy/openmpi/build/lib/libopen-pal.so:
linux-vdso.so.1 => (0x00007ffdfc374000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f46b6bb5000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f46b69ad000)
libutil.so.1 => /lib/x86_64-linux-gnu/libutil.so.1 (0x00007f46b67aa000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f46b63e0000)
/lib64/ld-linux-x86-64.so.2 (0x000055eca0708000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f46b61c2000)
Now, when I try to compile a small program with g++ version 4.9 using Open MPI shared library it fails with an /home/dummy/openmpi/build/lib/libopen-pal.so: undefined reference to pthread_atfork error. The small program is the following:
#include <stdio.h>
#include "mpi.h"
int main(void)
{
MPI_Comm comm;
int rank;
MPI_Comm_rank(comm, &rank);
printf("<%d>\n", rank);
return 0;
}
The compilation statement is:
g++ test.c -pthread -I/home/dummy/openmpi/build/include -L/home/dummy/openmpi/build/lib -lmpi -lopen-rte -lopen-pal
Any idea why g++ (i.e. C++ compiler) is throwing the aforementioned error? FYI, when I compile the same program with gcc (i.e. C compiler) it works perfectly.
Thank you,
L.
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