Failed linking attempt with FORTRAN and C++ (using MPI)

[Carlos Felipe Forigua Rodriguez]

Dear Users and Developers, 

With your help I've managed to use Cantera in C++ with FORTRAN in order to solve many reactors generated by the CFD software KIVA-4. I'm not trying to solve large mechanisms but many  reactors  with small mechanisms.

My setup is Lubuntu linux 16.04 + Cantera 2.2.2b1 + Intel compilers 2016 + sundials 2.6 + python 3.5.2 + boost 1.61 + OpenMPI 2.0.1. It works like a charm and even I can use OpenMP.

I have tested MPI linking C++ to FORTRAN with this code. It worked with these compiling instructions:

#Compile

mpicc -c quad_sub.c

mpif90 quad_sub.o quad_main.f90 -o programa

#run

mpirun -np 8 ./programa

I tried is to compile everything with OpenMPI. So I just made a code that calls some MPI functions in both FOTRAN and C++ in the files attached.

Using the makefile, I get the following error:

make -f MakeFile.MPI all -B

mpicc   -c cppwrapper.cpp -pthread -L/home/carlos/.local/lib -lcantera  -L/home/carlos/opt/sundials-intel/lib -lsundials_cvodes -lsundials_ida -lsundials_nvecserial -L/opt/intel/mkl/lib/intel64 -lmkl_rt -lmkl_intel_lp64 -lmkl_core -lmkl_intel_thread -liomp5 -L/usr/local/lib -lboost_system  -I/home/carlos/.local/include -I/home/carlos/opt/sundials-intel/include -I/usr/local/include 

mpif90  -g -O0  -o test cppwrapper.o fwrapper.f  -lc -lstdc++ -pthread -L/home/carlos/.local/lib -lcantera  -L/home/carlos/opt/sundials-intel/lib -lsundials_cvodes -lsundials_ida -lsundials_nvecserial -L/opt/intel/mkl/lib/intel64 -lmkl_rt -lmkl_intel_lp64 -lmkl_core -lmkl_intel_thread -liomp5 -L/usr/local/lib -lboost_system  

/usr/bin/ld: /home/carlos/.local/lib/libcantera.a(Methane.os): referencia sin definir al símbolo '__powr8i4'

/opt/intel/compilers_and_libraries_2016.3.210/linux/compiler/lib/intel64/libimf.so: error adding symbols: DSO missing from command line

collect2: error: ld returned 1 exit status

MakeFile.MPI:22: error in the instructions for the object 'test'

make: *** [test] Error 1

The non-MPI version of these files compiles without problems (It uses OpenMP, see the pragma in the C++ code). That indicates me that I've correctly loaded all the environment variables. 

I suspect that the error is due to the fact that there are 2 versions of the same library. The one used to compile fwrapper.f has MPI and the other non-MPI is the one used for Cantera.

I compiled both files separately using the "-c" option to generate only ".o" files. The compilation was successful. There was a warning that told me that the files were not linked.

¿Why is the linker failing?

Thank you very much for your help

Regards,

Carlos

[Ray Speth]

Carlos,

I think the missing symbols come from libraries that the C/C++ compiler normally links automatically, but are not included when linking as a Fortran program. This is, for instance, why you need to have '-lstdc++' on the link line, while this would never be needed if you were using the C++ compiler to link. I don't know what library contains the symbol '__powr8i4'. Presumably it's one of the ones included with the Intel C++ compiler or the MKL. Some googling suggests that this might be in the library 'libmmd'.

Regards,

Ray