[CMake] How to force cmake to only look for C MPI not C++

[Bruce Cartland]

Since I haven't worked with MPI, I don't think I can help much. Try
using the message command to dump variable contents
e.g. message(STATUS "CMAKE_C_FLAGS = ${CMAKE_C_FLAGS}")
You may need to add includes explicitly with the "include_directories"
(or similar) command. Hopefully some else using MPI can jump in.

On 18/03/14 17:34, Bibrak Qamar wrote:
> Thanks for the help.
>
> I did that but still the error persists.
>
> The C compiler identification is GNU
> -- Check for working C compiler:
> /export/home/bibrak/MPJExpress_Project/work/programs/installs/bin/gcc
> -- Check for working C compiler:
> /export/home/bibrak/MPJExpress_Project/work/programs/installs/bin/gcc
> -- works
> -- Detecting C compiler ABI info
> -- Detecting C compiler ABI info - done
> -- Found MPI:
> /export/home/bibrak/MPJExpress_Project/work/programs/mpich3_installed/lib/libmpichcxx.so
> -- Configuring done
> -- Generating done
>
>
> It finds *libmpichcxx.so* furthermore when I issue the make command it
> throws the error that mpi.h not found.
>
> Here is one of the entry in the depend.make file
>
> CMakeFiles/nativempjdev.dir/mpjdev_natmpjdev_Comm.c.o:
> ../mpjdev_natmpjdev_Comm.c
> CMakeFiles/nativempjdev.dir/mpjdev_natmpjdev_Comm.c.o:
> ../mpjdev_natmpjdev_Comm.h
> CMakeFiles/nativempjdev.dir/mpjdev_natmpjdev_Comm.c.o:
> ../mpjdev_natmpjdev_shared.h
> CMakeFiles/nativempjdev.dir/mpjdev_natmpjdev_Comm.c.o:
> /usr/java/latest/include/jni.h
> CMakeFiles/nativempjdev.dir/mpjdev_natmpjdev_Comm.c.o:
> /usr/java/latest/include/linux/jni_md.h
>
> Some how can't add *mpi.h *
>
> Does it mean this is not populated correctly ?*${MPI_C_INCLUDE_PATH}*
>
>
>
>
>
> Bibrak Qamar
>
>
>
> On Tue, Mar 18, 2014 at 11:22 AM, Bruce Cartland
> <bruce.cartland at pobox.com <mailto:bruce.cartland at pobox.com>> wrote:
>
>     Try the project command
>
>     * project(yourProjectName C)
>
>     It's what I use.
>
>     Quick Google found this
>
>     * http://www.cmake.org/cmake/help/cmake2.6docs.html#command:project
>
>
>
>     On 18/03/14 17:09, Bibrak Qamar wrote:
>>     Hi,
>>
>>     I am using cmake to create Makefile. I am using MPI in my project
>>     but I only want to use the C (mpicc) not C++ (mpicxx) following
>>     is the CMakeLists.txt:
>>
>>     I have tested it but on some platforms it seems that it only
>>     detects the C++ mpi (mpicxx) and uses its libraries. This creates
>>     errors (mpi.h not found) as the project only needs C (mpicc and
>>     its libraries).
>>
>>     So how to force cmake to only search for C (mpicc) and use its
>>     libraries (the mpi.h not mpicxx.h).
>>
>>
>>
>>     ADD_LIBRARY(nativempjdev SHARED ${SOURCE_FILES})
>>
>>     find_package(MPI)
>>     if(MPI_FOUND)
>>     set(CMAKE_C_COMPILE_FLAGS ${CMAKE_C_COMPILE_FLAGS}
>>     ${MPI_C_COMPILE_FLAGS})
>>     set(CMAKE_C_LINK_FLAGS ${CMAKE_C_LINK_FLAGS} ${MPI_C_LINK_FLAGS})
>>
>>     include_directories(${MPI_C_INCLUDE_PATH} $ENV{JAVA_HOME}/include
>>     $ENV{JAVA_HOME}/include/linux)
>>     endif(MPI_FOUND)
>>     target_link_libraries(nativempjdev ${MPI_C_LIBRARIES})
>>     install(TARGETS nativempjdev DESTINATION $ENV{MPJ_HOME}/lib)
>>
>>
>>
>>     Thanks
>>     Bibrak Qamar
>>
>>
>>
>
>
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