Correct detection of Open MPI in CMakeLists

Signed-off-by: Aurelien Bouteiller <[email protected]>
(cherry picked from commit 9138b1c)

Author: abouteiller

src/mpi/CMakeLists.txt

@@ -82,14 +82,15 @@ else()
 endif()
 
 set(MPI_HEADERS mpi.h)
-CHECK_INCLUDE_FILE("mpi-ext.h" HAVE_MPI_EXT)
+include(CheckIncludeFiles)
+CHECK_INCLUDE_FILES("mpi.h;mpi-ext.h" HAVE_MPI_EXT)
 if(HAVE_MPI_EXT)
   add_definitions(-DHAVE_MPI_EXT_H)
   set(MPI_HEADERS ${MPI_HEADERS};mpi-ext.h)
 endif()
 
 foreach(symbol ${NEEDED_SYMBOLS})
-  CHECK_SYMBOL_EXISTS(${symbol} ${MPI_HEADERS} HAVE_${symbol})
+  CHECK_SYMBOL_EXISTS(${symbol} "${MPI_HEADERS}" HAVE_${symbol})
   if(NOT HAVE_${symbol})
     message( STATUS "\${HAVE_${symbol}} = ${HAVE_${symbol}}")
     message( WARNING "Disabling Failed Image support due to lack of support in the current MPI implementation.")