[CMake] MPI: Undefined symbol

Tue Aug 21 10:59:44 EDT 2018

This stackoverflow
<https://stackoverflow.com/questions/23163075/how-to-compile-an-mpi-included-c-program-using-cmake/45485419#45485419>
question might help you.

On Tue, Aug 21, 2018 at 4:52 AM Florian Lindner <mailinglists at xgm.de> wrote:

> Hello,
>
> Am 20.08.18 um 17:49 schrieb Rafael Sadowski:
> > On Mon Aug 20, 2018 at 04:24:07PM +0200, Florian Lindner wrote:
> >> Hello,
> >>
> >> copied from a working MPI CMakeLists.txt:
> >>
> >> find_package(MPI REQUIRED)
> >
> > https://cmake.org/cmake/help/v3.0/module/FindMPI.html
> >
> > MPI_<lang>_FOUND           TRUE if FindMPI found MPI flags for <lang>
> > MPI_<lang>_COMPILER        MPI Compiler wrapper for <lang>
> > MPI_<lang>_COMPILE_FLAGS   Compilation flags for MPI programs
> > MPI_<lang>_INCLUDE_PATH    Include path(s) for MPI header
> > MPI_<lang>_LINK_FLAGS      Linking flags for MPI programs
> > MPI_<lang>_LIBRARIES       All libraries to link MPI programs against
> >
> > Looks like you forgot <lang>.
>
> Should also work, versions without LANG are deprecated, but still
> supported.
>
> But still, I didn't know about the new version and updated my cmake file,
> but still getting the same error.
>
> find_package(MPI REQUIRED
>   COMPONENTS CXX)
> include_directories(${MPI_CXX_INCLUDE_DIRS})
> set(COMPILE_OPTIONS  ${COMPILE_FLAGS} ${MPI_CXX_COMPILE_OPTIONS})
> set(LINK_FLAGS ${LINK_FLAGS} ${MPI_CXX_LINK_FLAGS})
> add_definitions(${MPI_CXX_COMPILE_DEFINTIONS})
>
> add_executable(StructureSolverParallel
>   "StructureSolver_Parallel/structureDataDisplay.cpp"
>   "StructureSolver_Parallel/StructureSolver.cpp"
>   "StructureSolver_Parallel/structureComputeSolution.cpp")
>
> target_link_libraries(StructureSolverParallel PUBLIC ${MPI_CXX_LBRARIES})
>
>
> [ 61%] Building CXX object
> CMakeFiles/StructureSolverParallel.dir/StructureSolver_Parallel/structureComputeSolution.cpp.o
> /usr/bin/c++   -I/home/lindnefn/precice/src -I/opt/mpich/include  -Wall
> -Wextra -Wno-unused-parameter -g   -std=gnu++11 -o
> CMakeFiles/StructureSolverParallel.dir/StructureSolver_Parallel/structureComputeSolution.cpp.o
> -c
> /home/lindnefn/devel/elastictube1d/StructureSolver_Parallel/structureComputeSolution.cpp
>
> [ 69%] Linking CXX executable StructureSolverParallel
> /usr/bin/cmake -E cmake_link_script
> CMakeFiles/StructureSolverParallel.dir/link.txt --verbose=1
> /usr/bin/c++   -Wall -Wextra -Wno-unused-parameter -g
>  CMakeFiles/StructureSolverParallel.dir/StructureSolver_Parallel/structureDataDisplay.cpp.o
> CMakeFiles/StructureSolverParallel.dir/StructureSolver_Parallel/StructureSolver.cpp.o
> CMakeFiles/StructureSolverParallel.dir/StructureSolver_Parallel/structureComputeSolution.cpp.o
> -o StructureSolverParallel /home/lindnefn/precice/build/last/libprecice.so
>
> /usr/bin/ld:
> CMakeFiles/StructureSolverParallel.dir/StructureSolver_Parallel/StructureSolver.cpp.o:
> undefined reference to symbol 'MPI_Init'
> /usr/bin/ld: /opt/mpich/lib/libmpi.so.12: error adding symbols: DSO
> missing from command line
>
> It doesn't seem to put the MPI_CXX_LIBRARIES at the end. Again, just
> adding -lmpi to the final command does the trick.
>
> Putting message(${MPI_CXX_LIBRARIES}) after the MPI block returns:
>
> /opt/mpich/lib/libmpicxx.so/opt/mpich/lib/libmpi.so
>
> Any more ideas?
>
> Thanks,
> Florian
>
>
> >
> >> include_directories(${MPI_INCLUDE_PATH})
> >> set(COMPILE_FLAGS  ${COMPILE_FLAGS} ${MPI_COMPILE_FLAGS})
> >> set(LINK_FLAGS ${LINK_FLAGS} ${MPI_LINK_FLAGS})
> >>
> >>
> >> add_executable(StructureSolverParallel
> >>   "StructureSolver_Parallel/structureDataDisplay.cpp"
> >>   "StructureSolver_Parallel/StructureSolver.cpp"
> >>   "StructureSolver_Parallel/structureComputeSolution.cpp")
> >>
> >> target_link_libraries(StructureSolverParallel PUBLIC ${PRECICE_LIBRARY})
> >> target_link_libraries(StructureSolverParallel PUBLIC ${MPI_LBRARIES})
> >>
> >> configuration runs smooth:
> >>
> >> % cmake -DMPI_CXX_COMPILER=/opt/mpich/bin/mpicxx
> -DMPI_C_COMPILER=/opt/mpich/bin/mpicc . && make
> >> -- The CXX compiler identification is GNU 8.2.0
> >> [...]
> >> -- Found MPI_CXX: /opt/mpich/lib/libmpicxx.so (found version "3.1")
> >> -- Found MPI: TRUE (found version "3.1")
> >>
> >> make however:
> >>
> >> [ 69%] Linking CXX executable StructureSolverParallel
> >> /usr/bin/cmake -E cmake_link_script
> CMakeFiles/StructureSolverParallel.dir/link.txt --verbose=1
> >> /usr/bin/c++   -Wall -Wextra -Wno-unused-parameter -g
>  CMakeFiles/StructureSolverParallel.dir/StructureSolver_Parallel/structureDataDisplay.cpp.o
> CMakeFiles/StructureSolverParallel.dir/StructureSolver_Parallel/StructureSolver.cpp.o
> CMakeFiles/StructureSolverParallel.dir/StructureSolver_Parallel/structureComputeSolution.cpp.o
> -o StructureSolverParallel /home/lindnefn/precice/build/last/libprecice.so
> >> /usr/bin/ld:
> CMakeFiles/StructureSolverParallel.dir/StructureSolver_Parallel/StructureSolver.cpp.o:
> undefined reference to symbol 'MPI_Init'
> >> /usr/bin/ld: /opt/mpich/lib/libmpi.so.12: error adding symbols: DSO
> missing from command line
> >>
> >> when I just take the last command line and -lmpi to it, it works.
> >>
> >> What could be missing there in CMakeLists?
> >>
> >> Thanks,
> >> Florian
> >>
> >> --
> >>
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> >>
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>
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>
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-- 
Best regards
Haocheng

Haocheng LIU
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4421 <javascript:void(0);>
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