[CMake] FindMPI.cmake and MS-MPI

[Todd Gamblin]

Andrew,

Thanks for letting me know.  Let me know if you have any more issues.

Ben: at some point I was the maintainer for FindMPI.  Are you the official
maintainer now?  Do you want to be?  I have very limited ability to test on
Windows, and that seems to be where most of the problems are.

-Todd


From:  Andrew Maclean <andrew.amaclean at gmail.com>
Reply-To:  "andrew.amaclean at gmail.com" <andrew.amaclean at gmail.com>
Date:  Sunday, March 1, 2015 at 11:31 PM
To:  Todd Gamblin <tgamblin at llnl.gov>, "cmake at cmake.org" <cmake at cmake.org>,
Ben Boeckel <ben.boeckel at kitware.com>
Subject:  Re: FindMPI.cmake and MS-MPI

> Please ignore my emails regarding this. Apparently Ben Boeckel has fixed these
> issues in CMake 3.2.0-rc1. Sorry for the unnecessary bandwidth utilization!
> 
> I can confirm that the VTK master version works OK with MS-MPI.
> 
> Regards
>    Andrew
> 
> 
> On Mon, Mar 2, 2015 at 9:58 AM, Andrew Maclean <andrew.amaclean at gmail.com>
> wrote:
>> Some further information, ignore the CMP0054 warning it is not triggered when
>> the CMake Minimum Version is 3.1
>> 
>> When running FindMPI.cmake, I discovered that I had a spurious registry entry
>> for an older version of MPI so mpiexec.exe was not being found. When I
>> deleted this it found mpiexec.exe in C:/Program Files/Microsoft
>> MPI/Bin/mpiexec.exe OK. I think the key for
>> HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\MPI should still be there before the
>> other registry keys.
>> 
>> You definitely need the new lib and include paths.
>> 
>> I was able to use FindMPI.cmake and just add in these paths manually.
>> 
>> Hope this helps.
>> 
>> Regards
>>    Andrew
>> 
>> 
>> On Sun, Mar 1, 2015 at 3:54 PM, Andrew Maclean <andrew.amaclean at gmail.com>
>> wrote:
>>> Re-sending because David in no longer at Kitware.
>>> 
>>> I downloaded and installed MS-MPI from
>>> http://www.microsoft.com/en-us/download/details.aspx?id=44990
>>> 
>>> This implementation does not work with FindMPI.cmake.
>>> 
>>> The includes and libs are found in:
>>> C:/Program Files (x86)/Microsoft SDKs/MPI/
>>> and mpiexec.exe is in: C:/Program Files/Microsoft MPI/Bin/
>>> 
>>> I had to do the following changes to get it working. Perhaps you would like
>>> to edit FIndMPI.cmake to incorporate these changes:
>>> ----------
>>> # Require MPI for this project:
>>> if(WIN32)
>>>   #This is for finding MS-MPI.
>>>   #set(_MPI_PREFIX_PATH)
>>>   #list(APPEND _MPI_PREFIX_PATH
>>> "[HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\MPI;Path]/..")
>>>   set(MPIEXEC "C:/Program Files/Microsoft MPI/Bin/mpiexec.exe")
>>>   # For building MPI programs the selected Visual Studio compiler is used,
>>> namely cl.exe.
>>>   # So there is no need to set a specific MPI compiler.
>>>   #set(MPI_CXX_COMPILER "${CMAKE_CXX_COMPILER}")
>>>   set(MPI_CXX_INCLUDE_PATH "C:/Program Files (x86)/Microsoft
>>> SDKs/MPI/Include")
>>>   # Make sure the correct libraries (64-bit or 32-bit) are selected.
>>>   # Decide between 32-bit and 64-bit libraries for Microsoft's MPI
>>>   if("${CMAKE_SIZEOF_VOID_P}" EQUAL 8)
>>>     set(MS_MPI_ARCH_DIR x64)
>>>   else()
>>>     set(MS_MPI_ARCH_DIR x86)
>>>   endif()
>>>   set(MPI_CXX_LIBRARIES "C:/Program Files (x86)/Microsoft
>>> SDKs/MPI/Lib/${MS_MPI_ARCH_DIR}/msmpi.lib")
>>>   set(MPI_C_INCLUDE_PATH "${MPI_CXX_INCLUDE_PATH}")
>>>   set(MPI_C_LIBRARIES "{${MPI_CXX_LIBRARIES}")
>>>   set(MPIEXEC_NUMPROC_FLAG "-np" CACHE STRING "Flag used by MPI to specify
>>> the number of processes for MPIEXEC; the next option will be the number of
>>> processes.")
>>> else()
>>>     find_package(MPI REQUIRED)
>>> endif()
>>> --------
>>> Some of this is taken from FindMPI.cmake.
>>> 
>>> Attached is a zipped up file of the working CMakeLists.txt file and a test
>>> file for you.
>>> 
>>> I looked at FindMPI.cmake but I think you guys are better placed to make the
>>> changes.
>>> 
>>> Also in the case of FindMPI.cmake, you will need to fix the following
>>> warning message:
>>> 
>>> CMake Warning (dev) at C:/Program Files
>>> (x86)/CMake/share/cmake-3.1/Modules/FindMPI.cmake:163 (if):
>>> Policy CMP0054 is not set: Only interpret if() arguments as variables or
>>> keywords when unquoted. Run "cmake --help-policy CMP0054" for policy
>>> details. Use the cmake_policy command to set the policy and suppress this
>>> warning.
>>> 
>>> Quoted variables like "MSVC" will no longer be dereferenced when the policy
>>> is set to NEW. Since the policy is not set the OLD behavior will be used.
>>> Call Stack (most recent call first):
>>> CMakeLists.txt:5 (find_package)
>>> This warning is for project developers. Use -Wno-dev to suppress it.CMake
>>> Warning (dev) at C:/Program Files
>>> (x86)/CMake/share/cmake-3.1/Modules/FindMPI.cmake:163 (if):
>>> Policy CMP0054 is not set: Only interpret if() arguments as variables or
>>> keywords when unquoted. Run "cmake --help-policy CMP0054" for policy
>>> details. Use the cmake_policy command to set the policy and suppress this
>>> warning.
>>> 
>>> Quoted variables like "MSVC" will no longer be dereferenced when the policy
>>> is set to NEW. Since the policy is not set the OLD behavior will be used.
>>> Call Stack (most recent call first):
>>> CMakeLists.txt:5 (find_package)
>>> This warning is for project developers. Use -Wno-dev to suppress it.
>>> 
>>> 
>>> Regards
>>> 
>>> Andrew
>>> 
>>> 
>>> -- 
>>> ___________________________________________
>>> Andrew J. P. Maclean
>>> 
>>> ___________________________________________
>> 
>> 
>> 
>> -- 
>> ___________________________________________
>> Andrew J. P. Maclean
>> 
>> ___________________________________________
> 
> 
> 
> -- 
> ___________________________________________
> Andrew J. P. Maclean
> 
> ___________________________________________


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