[CMake] [CMAKE] Defining MPI_C_COMPILER on Windows

[Michel Lestrade]

I need to pass the MPI_C_COMPILER value through the command line since 
the Intel MPI libraries are not being recognized properly by the FindMPI 
script (CMake 2.8.8). I used the following syntax:

cmake -G "NMake Makefiles" -DMPI_C_COMPILER:FILEPATH="C:/Program Files 
(x86)/Intel/MPI/4.0.3.009/em64t/bin/mpicc"

but the CMake cache file reports the following entry instead (even after 
deleting the old cache and CMake tree):

//Cleared
MPI_C_COMPILER:FILEPATH=MPI_C_COMPILER-NOTFOUND

I am a complete newbie to CMake and while this should be obvious, I 
cannot figure out the right syntax. I even tried using a subst'ed drive 
to define the path without using a long directory name (just in case): 
the variable is still "cleared" by something.

Can anyone explain what I am doing wrong ?

-------------- next part --------------
cmake_minimum_required(VERSION 2.8)
project(hello)

# Search for MPI.
include(FindMPI)
if(NOT MPI_FOUND)
  message(FATAL_ERROR "mpi is not found")
endif()