[CMake] FindMPI

[Chuck Atkins]

Hi Zaak,

When using CMake, it's generally best to use the actual compiler rather
than any compiler wrappers (with Cray being the exception).  Given that,
set the CC, CXX, and FC environment variables to the actual compilers you
want to use and then the MPI_{C,CXX,Fortan}_COMPILER CMake variables the
MPI wrappers.  FindMPI will then interrogate the MPI wrappers to extract
the appropriate include and link options.

----------
Chuck Atkins
Staff R&D Engineer, Scientific Computing
Kitware, Inc.


On Mon, Nov 28, 2016 at 9:58 AM, Chuck Atkins <chuck.atkins at kitware.com>
wrote:

> Pass the following CMake options at configure time:
>
> -DMPI_C_COMPILER=/path/to/mpicc
> -DMPI_CXX_COMPILER=/path/to/mpiCC
> -DMPI_Fortran_COMPILER=/path/to/mpif90
>
> ----------
> Chuck Atkins
> Staff R&D Engineer, Scientific Computing
> Kitware, Inc.
>
>
> On Wed, Nov 23, 2016 at 6:05 PM, Zaak Beekman <zbeekman at gmail.com> wrote:
>
>> Hi,
>>
>> I want to be able to pass FC=mpif90 (or FC=$(which mpif90)) and CC=mpicc
>> etc. OR also be able to pass a compiler and use FindMPI to add link,
>> compile and include flags. I'm encountering an issue when my MPI
>> implementation is not on my PATH, I want CMake to be able to look in an
>> additional location (our build script can download and build MPICH and by
>> default installs it in user space) and also resolve where mpif90 is coming
>> from and look there too.
>>
>> Whats the correct way to pass HINTS or PATHS to FindMPI? i.e., how do I
>> specify additional locations to search?
>>
>> Using `find_package` with HINTS and PATHS means that it doesn't use
>> FindMPI. I also tried setting CMAKE_SYSTEM PREFIX_PATH, but I think that's
>> a cache variable set early, so it's not having an effect.
>>
>> It would be great if FindMPI used the realpath of mpif90 etc when passed
>> as $FC.
>>
>> TIA
>>
>> --
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