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I inherited a rather large project that I am trying to get to compile (it's a bit old, maybe 10 years). I am trying to use new intel compilers with intel mpi on Ubuntu WSL.

There are some C modules and some fortran modules that I compile like so:

C Module:

mpiicc -g -DUSE_MPI_IO -Dlinux -DUse_Intel_Fortran -MP -D_FILE_OFFSET_BITS=64 -w -DLONG64 -O -L/home/xxx/intel/2024.2.1/oneapi/mpi/latest/lib -D__MPI__ -I/home/xxx/intel/2024.2.1/oneapi/mpi/latest/include -I. -c -o module_a.o module_a.c

Fortran Module:

mpiifort -g -c -I. -DUse_Intel_Fortran -MP -w -O -D__MPI__ -I/home/xxxx/intel/2024.2.1/oneapi/mpi/latest/include -L/home/xxx/intel/2024.2.1/oneapi/mpi/latest/lib module_b.f90

These compile just fine, but then I try to link these objects to the c compiler:

mpiicc -g -v -O -o final.x module_a.o module_b.o -lm -lmpi -L/home/xxx/intel/2024.2.1/oneapi/mpi/latest/lib

And I get a bunch of undefined reference MPI errors only for the fortran modules:

module_b.o:(.text+0x1838c): undefined reference to "mpi_send_"

module_b.o:(.text+0x1838c): undefined reference to "mpi_abort_"

Seems like I'm doing something stupid, but I can't find many other cases of people doing this for reference.

Any help is appreciated!

edit to correct a mistake, the errors are only for the fortran modules, not the C modules

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  • -o -I doesn't look right. Your binary will be named -I. You don't need -I for linking. Two possible approaches to solve your missing symbols: use the Fortran compiler for linking. It might require an extra flag to tell the Fortran compiler to do not generate a main function if that comes from C. Alternatively, you will need to explicitly link the MPI Fortran library. Find out, what mpiifort links additionally by checking ifort -show Commented Oct 24, 2024 at 23:31
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    you might simply want to link with the Fortran wrapper (e.g. mpiifort). If not, you need to manually link with the Fortran MPI library (e.g. -lmpifort) Commented Oct 25, 2024 at 0:14
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    @GillesGouaillardet Ah, -lmpifort was what I was missing, thanks so much. Commented Oct 25, 2024 at 17:11
  • @Joachim You are correct, but that was actually at typo I introduced into the post, thank you! Commented Oct 25, 2024 at 17:12
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