All, There is a new implementation of the FindMPI module in next. There are a number of changes in this version, and it did not quite make it into 2.8.4 because it needs more testing. If you are interested in this and can kick the tires, please try it out and send feedback to me.
There motivation for the new version was that the existing FindMPI does not
support multiple languages properly. It assumes you want either C++ or C, and
it doesn't care which you get. There is also no good way to do MPI for fortran
-- the compilers are not detected.
The new interface replaces these variables:
MPI_FOUND
MPI_COMPILER
MPI_LIBRARY
MPI_COMPILE_FLAGS
MPI_INCLUDE_PATH
MPI_EXTRA_LIBRARY
MPI_LINK_FLAGS
MPI_LIBRARIES
With these:
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
for each <lang> in (CXX, C, Fortran).
The old variables will continue to work; they are set to the MPI_CXX_
equivalent if it is available, and the MPI_C_ version if it is not.
However, there are some backward compatibility concerns. In particular, you
need to set either MPI_<lang>_COMPILER or MPI_<lang>_INCLUDE_PATH and
MPI_<lang>_LIBRARIES to override autodetection. In the old FindMPI, you would
have set either MPI_COMPILER, MPI_INCLUDE_PATH, MPI_LIBRARY, and possibly
MPI_EXTRA_LIBRARY to do the same. Right now, the old variables don't serve as
hints to the new detection mechanism, so you may need to reconfigure your -D
arguments to CMake for new projects.
Again, the old variables continue to be *set* in the new version, but they are
no longer used as input to the module.
Finally, there are a few other improvements. This FindMPI will search for more
compiler names, and it will attempt to match the MPI compiler to the ID of the
CXX, C, or Fortran compiler. This version also searches a few more paths for
Windows, and should properly detect MPICH2 on Windows.
Please test this as much as possible so that hopefully this or some improved
version can go into 2.8.5 in April. You can either try the version in CMake
next, or the attached FindMPI.cmake.
-Todd
FindMPI.cmake
Description: Binary data
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