View Full Version : [SOLVED] trying to compile fortran code that uses mpi - linking issues?

May 20th, 2012, 01:10 AM
Hi, I am trying to compile a fortran code which uses mpich2. I am using gfortran. Since originally I was getting the error

Error: Can't open included file 'mpif.h'

I have added -I/usr/lib/mpich2/include/ which has gotten rid of that error, and now I have errors such as these:

undefined reference to `mpi_send_'
undefined reference to `mpi_recv_'

As a side note I'm also getting a warning:

Warning: Blanket SAVE statement at (1) follows previous SAVE statement

But I'm guessing that is unrelated to my undefined reference problem.

Does anyone know how to fix this?


May 20th, 2012, 02:27 PM
I'm not a fortran guy but maybe you need an equivalent -J/path/to/.mod (or equivalent appended to your MOD_PATH) to pick up the actual compiled modules?

May 21st, 2012, 06:45 PM
are you using mpif90/mpif77 to compiler your program? if not you should
less recommended alternative:

mpif90 --showme:compile
mpif90 --showme:link

#outputs for openmpi:
-I/usr/lib/openmpi/include -pthread -I/usr/lib/openmpi/lib

-pthread -I/usr/lib/openmpi/lib -L/usr/lib/openmpi/lib -lmpi_f90 -lmpi_f77 -lmpi -lopen-rte -lopen-pal -ldl -Wl,--export-dynamic -lnsl -lutil -lm -ldl

to get the needed flags