I'm not too familiar with Fortran, I'm only compiling a program from source (DLPOLY). Could you tell me what compiler flags I could try or where I could look? I didn't see anything too likely in the xlf manual.

On Jul 9, 2007, at 3:07 PM, lam-request@lam-mpi.org wrote:

Aaron,

Instead of trying to correct it with LDFLAGS at load time, Can you use compiler
options for your code to match the MPI entry points?

Joe

From: lam-bounces@lam-mpi.org [mailto:lam-bounces@lam-mpi.org] On Behalf Of Aaron Thompson
Sent: Monday, July 09, 2007 11:43 AM
To: General LAM/MPI mailing list
Subject: Re: LAM: Undefined MPI symbols linker error with XLF

Underscores could be the issue. My program is calling MPI functions in all caps with no underscoring, e.g. MPI_SEND . I tried adding -fno_underscoring to my LDFLAGS, but that didn't help. Are there any other flags can I try using?

Thank you,

Aaron Thompson
Vanderbilt University
aaron.p.thompson@vanderbilt.edu

Could your problem be Case or leading or trailing underscores?

Some code has:

MPI_Send
mpi_send
mpi_send_
_mpi_send_

The code and MPI libs need to have the same Case and underscore policy.

Regards,
joe Griffin