Problem linking 3rdparty/parmmg

FreeFEM installation
1

Hi, everyone,
I need help with compiling latest version of FreeFem from source. I have problem compiling FreeFem after git pull command. I have tons of undefined references errors related to OpenMPI, for example:

/usr/bin/ld: ../3rdparty/parmmg/parmmg-sources/src/parmmg.c:76: undefined reference to 'ompi_mpi_comm_world'
/usr/bin/ld: ../3rdparty/parmmg/parmmg-sources/src/parmmg.c:311: undefined reference to 'ompi_mpi_op_min'

The gcc command that produce this error is:

/usr/bin/g++  -DUSE_MPI -g  -DNDEBUG -O3 -mmmx -mavx -std=c++14 -DBAMG_LONG_LONG  -DNCHECKPTR -fPIC -std=c++14 -fPIC -O3 -DNDEBUG  -Wl,-Bsymbolic-functions -rdynamic CMakeFiles/parmmg.dir/src/parmmg.c.o  -o bin/parmmg_O3  -Wl,-rpath,/home/piotr/FreeFem-install/ff-petsc/r/lib: lib/libparmmg.a /home/piotr/FreeFem-install/ff-petsc/r/lib/libmetis.so /home/piotr/Projects/FreeFem-sources/3rdparty/mmg/build/lib/libmmg.a -lmpichcxx -lmpich -lmpich /home/piotr/FreeFem-install/ff-petsc/r/lib/libscotch.a /home/piotr/FreeFem-install/ff-petsc/r/lib/libscotcherrexit.a -lpthread -lz -lm -lrt -lm

The problem is obviously related to the fact that I use MPICH as an MPI implementation, whereas the source requires OpenMPI for some reason. I have both the libraries installed in my system, but I autoreconf choose MPICH. Is there any config option to force using OpenMPI, or, may be some switch in parmmg to use MPICH ?
Thanks.

2

Do you really need both MPI implementations on your system? This usually leads to such problems…
You should be able to force the use of MPICH by specifying during configuration ./configure MPICC=your_mpich_wrapper MPICXX=your_mpich_wrapper MPIFC=your_mpich_wrapper.

3

Thanks for the answer.
Reinstalling the source, reconfiguring, and rebuilding ff-petsc helped to tackle the problem. Yet now I am stuck in the following error

/usr/bin/mpic++ -c -fPIC '-I../seq/include' '-I/home/piotr/Projects/FreeFem-sources/3rdparty/include/' '-I/home/piotr/Projects/FreeFem-sources/3rdparty/include/' '-I/usr/lib/x86_64-linux-gnu/openmpi/include/openmpi' '-I/usr/lib/x86_64-linux-gnu/openmpi/include' '-I/usr/local/ff-petsc/r/include' '-I/usr/local/ff-petsc/r/include' -g -DNDEBUG -O3 -mmmx -mavx -std=c++14 -DBAMG_LONG_LONG -DNCHECKPTR -fPIC -I/usr/local/ff-petsc/r/include -I/usr/include/hdf5/serial -I/usr/include 'parmmg.cpp'
parmmg.cpp: In member function 'virtual AnyType parmmg_Op::operator()(Stack) const':
parmmg.cpp:290:42: error: 'PMMG_IPARAM_opnbdy' was not declared in this scope
   if (nargs[i]) PMMG_Set_iparameter(mesh,PMMG_IPARAM_opnbdy,        arg(i,stack,0L)); i++;   /*!< [0/1], Enable preservation of open boundaries */

Though I see that the symbol is defined in libparmmg.h I can’t find parmmg.cpp (only parmmg.c) to check it out.

I keep the both implementation of MPI because there are some other projects that (may) require different libraries.

4

You are using an old ParMmg version. You probably have to go in 3rdparty/parmmg and do something like make clean followed by make, whatever it takes to reinstall the latest version of ParMmg.

5

Thanks, that has helped