[CMake] FindMPI: finding openmpi libs and includes

[Hicham Mouline]

You have this snippet in there:

 

set(_MPI_PREFIX_PATH)

if(WIN32)

  list(APPEND _MPI_PREFIX_PATH
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\MPICH\\SMPD;binary]/..")

  list(APPEND _MPI_PREFIX_PATH
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\MPICH2;Path]")

endif()

 

foreach(SystemPrefixDir ${CMAKE_SYSTEM_PREFIX_PATH})

  foreach(MpiPackageDir ${_MPI_PREFIX_PATH})

    MESSAGE(STATUS "${SystemPrefixDir}/${MpiPackageDir}")

    if(EXISTS ${SystemPrefixDir}/${MpiPackageDir})      

      list(APPEND _MPI_PREFIX_PATH "${SystemPrefixDir}/${MpiPackageDir}")

    endif()

  endforeach(MpiPackageDir)

endforeach(SystemPrefixDir)

 

For openmpi for e.g, a possible install path is c:\program
files\openmpi\bin, lib, include, share

 

Should _MPI_PREFIX_PATH include "openmpi" then?

 

 _MPI_PREFIX_PATH is appended to inside the foreach loops, but is used at
the same time as the index of the iteration?

 

From: Dave Partyka [mailto:dave.partyka at kitware.com] 
Sent: 30 November 2010 22:42
To: Hicham Mouline
Cc: CMake mailing list
Subject: Re: [CMake] FindMPI: finding openmpi libs and includes

 

It will search standard locations (/usr/include & /usr/lib) for the headers
and libs. Set MPI_LIBRARY and MPI_INCLUDE_PATH if it doesn't locate them for
you automatically. The FindMPI module does interrogate the mpicc compiler
for some of this information but I am not sure if that is the case on
Windows.

On Tue, Nov 30, 2010 at 5:26 PM, Hicham Mouline <hicham at mouline.org> wrote:

Hi,

I have built debug and release win32 and x64 openmpi libs for windows, and I
have them installed on linux x64.

How does FindMPI work for auto detecting If I don't set any MPI_ variable at
all?

Does it search for mpic++ in the %PATH% or $PATH?

What MPI_ variables is the user required to define?

 

regards,


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