[CMake] find_package(mpi) language specification

[Nick Overdijk]

You can pass the QUIET parameter to find_package... that'll at least shut it up. Perhaps easiest in your case.

On 2013-05-09, at 18:22:25 , Andrew Corrigan wrote:

> Hello,
> 
> My C++ code only uses the MPI C library. 
> 
> 1. Is there a way to tell find_package(MPI) to only look for the C version?
> 2. If not, can FindMPI.cmake be changed to support this (just like with Boost you can specify only the components you need)
> 3. If not, can that warning message  "Could NOT find MPI_CXX missing: MPI_CXX_LIBRARIES MPI_CXX_INCLUDE_PATH" be suppressed?  It is *extremely* confusing to users.
> 
> More info:
> 
> The language-specific detection for MPI that was added a few versions ago has been a huge help in avoiding linking with the deprecated MPI C++ library.  I still have a problem, and that is find_package(MPI) still attempts to find the MPI C++ library.
> 
> When it is not found, which is more often than not the case on the various HPC systems this code runs on, the warning "Could NOT find MPI_CXX missing: MPI_CXX_LIBRARIES MPI_CXX_INCLUDE_PATH" is issued.  I do not want CMake to even try to detect the C++ version of MPI, and this has been a major source of confusion for users of this code, since they think that something has gone wrong and report it to me. In response to this, I added the following clarification, but despite this, users remain confused.
> 
>> if(NOT MPI_CXX_FOUND)
>> message(STATUS "==> MPI_CXX_* IS NOT REQUIRED")
>> message(STATUS "==> IGNORE ANY WARNING REGARDING MPI_CXX_*")
>> end
> 
> 
> Thanks,
> Andrew Corrigan
> 
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