I have been using Open MPI in conjunction with PETSc on OSX 10.4, and had been having trouble with undefined symbols when trying tests with PETSc:

/usr/bin/ld: Undefined symbols:

After playing around with things for a while, I realized that these undefined symbols only appeared in libmpi_f90.a, and were somehow being pulled into the PETSc libraries when they were built.  The problem occurred when trying to build an executable that included libraries with these undefined symbols.  The simplest solution I could think of was to edit include/mpif.h.in.  In the last two lines of this file I simply changed:

>       double precision MPI_WTIME, MPI_WTICK, PMPI_WTIME, PMPI_WTICK


<       double precision MPI_WTIME, MPI_WTICK
<       external MPI_WTIME, MPI_WTICK

This fixed the problem for me, and I am wondering whether this is a reasonable fix.  My understanding is that the functions are not actually part of open-mpi.  Would this approach break anything else?  If not, it would be nice to include it, since the only other option I can think of for fixing things on OSX 10.4 with the current build procedures is to strip libraries of undefined symbols before they are used.


Charles A. Williams

Dept. of Earth & Environmental Sciences

Science Center, 2C01B

Rensselaer Polytechnic Institute

Troy, NY  12180

Phone:    (518) 276-3369

FAX:        (518) 276-2012

e-mail:    willic3@rpi.edu