Hi On a newly installed 64bit linux (2.6.32-gentoo-r7) with gcc version 4.4.4 i can't compile even simple Open-MPI applications (OpenMPI 1.4.2).
The message is: jody@aim-squid_0 ~/progs $ mpiCC -g -o HelloMPI HelloMPI.cpp /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.4/../../../../x86_64-pc-linux-gnu/bin/ld: skipping incompatible /opt/openmpi-1.4.2/lib/libmpi_cxx.so when searching for -lmpi_cxx /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.4/../../../../x86_64-pc-linux-gnu/bin/ld: cannot find -lmpi_cxx collect2: ld returned 1 exit status I am using the 64bit mpiCC: jody@aim-squid_0 ~/progs $ which mpiCC /opt/openmpi/bin/mpiCC jody@aim-squid_0 ~/progs $ ls -l /opt/openmpi lrwxrwxrwx 1 root root 22 Nov 1 09:56 /opt/openmpi -> /opt/openmpi-1.4.2-64/ The mpi_cxx should be found in the lib subdirectory: jody@aim-squid_0 ~/progs $ ls -l /opt/openmpi/lib/libmpi_cxx* -rwxr-xr-x 1 root root 1073 Jun 24 15:50 /opt/openmpi/lib/libmpi_cxx.la lrwxrwxrwx 1 root root 19 Jun 24 15:50 /opt/openmpi/lib/libmpi_cxx.so -> libmpi_cxx.so.0.0.1 lrwxrwxrwx 1 root root 19 Jun 24 15:50 /opt/openmpi/lib/libmpi_cxx.so.0 -> libmpi_cxx.so.0.0.1 -rwxr-xr-x 1 root root 137442 Jun 24 15:50 /opt/openmpi/lib/libmpi_cxx.so.0.0.1 PATH and LD_LIBRARY_PATH contain the correct paths: jody@aim-squid_0 ~/progs $ echo $PATH /opt/openmpi/bin:/usr/local/bin:/usr/local/bin:/usr/bin:/bin:/opt/bin:/usr/x86_64-pc-linux-gnu/gcc-bin/4.4.4 jody@aim-squid_0 ~/progs $ echo $LD_LIBRARY_PATH /opt/openmpi/lib: AM i missing something? Thank You jody
