I succeded to compile and run simple C++ app with PathScale 3.2 evaluation version. look below.
Maybe you had some installation / licence problems.
I was in touch with Ben firstname.lastname@example.org from PathScale support who helped me with installation.
This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.
It was created by Open MPI configure 1.4a1, which was
generated by GNU Autoconf 2.61. Invocation command line was
$ ../configure --with-memory-manager=ptmalloc2 --with-openib --prefix=/home/USERS/lenny/OMPI_COMP_PATH CC=pathcc CXX=pathCC FC=pathf90 F77=pathf90 F90=pathf90
## --------- ##
## Platform. ##
/home/USERS/lenny/OMPI_COMP_PATH/bin/mpiCC -o hello_c_plus hello++.cc
In file included from /usr/include/c++/4.1.2/backward/iostream.h:31,
/usr/include/c++/4.1.2/backward/backward_warning.h:32:2: warning: #warning This file includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 184.108.40.206 of the C++ standard. Examples include substituting the <X> header for the <X.h> header for C++ includes, or <iostream> instead of the deprecated header <iostream.h>. To disable this warning use -Wno-deprecated.
witch1:/home/USERS/lenny/TESTS/COMPILERS # /home/USERS/lenny/OMPI_COMP_PATH/bin/mpirun -np 2 -H witch16,witch17 ./hello_c_plus
Hello World! I am 0 of 2
Hello World! I am 1 of 2