Thanks for the insight Brad. Another advantage may be that the FindMPI module knows about what `mpirun` or `mpiexec` is called, as well as some common flags, like number of ranks to execute. Since OpenCoarrays writes an MPI compiler wrapper script and a script to run the executable, `caf` and `cafrun`, using FindMPI could also help reduce the overhead of knowing about different MPI implementations and their peculiarities; this task would effectively be delighted to FindMPI...
Damian, I'll poke around in the CMake code and we can discuss this on Friday. Thanks again, -Zaak On Mon, Dec 7, 2015 at 8:56 AM Brad King <brad.k...@kitware.com> wrote: > On 12/04/2015 05:51 PM, Zaak Beekman wrote: > > What are the pros and cons of using FindMPI over passing FC=mpif90 and > CC=mpicc? > > It shouldn't matter much if all the code in the project is meant > to be build for MPI. Using plain FindMPI with the CC/CXX/FC set > to the system compilers is cleaner for building only a subset of > targets for MPI. FindMPI will look for the MPI compilers separately > in order to ask them for the proper flags to tell the system compiler > how to use MPI, and then project CMake code can take responsibility > for applying that information to the desired subset of its targets. > Using CC=mpicc, FindMPI will recognize that the C compiler is already > a MPI compiler and not bother to look for a separate one to query > the settings (and similarly for C++ and Fortran). > > -Brad > >
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