synchro chameleon with Xavier's work on modules: add FindMPIEXT

cmake_modules/morse/find/FindMPIEXT.cmake

+# - Find MPI EXTENDED for MORSE projects:
+#
+# This module allows to find MPI libraries by calling the official FindMPI module
+# and adds an additional variable indicating the level of thread supported:
+#  MPI_THREAD_SUPPORTED_LEVEL - MPI_THREAD_MULTIPLE, MPI_THREAD_SERIALIZED, MPI_THREAD_FUNNELED, or MPI_THREAD_SINGLE
+
+#=============================================================================
+# Copyright 2012-2013 Inria
+# Copyright 2012-2013 Emmanuel Agullo
+# Copyright 2012-2013 Mathieu Faverge
+# Copyright 2012      Cedric Castagnede
+# Copyright 2013      Florent Pruvost
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file MORSE-Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of Morse, substitute the full
+#  License text for the above reference.)
+
+# add a cache variable to let the user specify the BLAS vendor
+if (NOT MPI_FOUND)
+    if(MPIEXT_FIND_REQUIRED)
+        find_package(MPI REQUIRED)
+    else()
+        find_package(MPI)
+    endif()
+endif ()
+
+if (MPI_FOUND)
+  set(CMAKE_REQUIRED_INCLUDES_SAVE ${CMAKE_REQUIRED_INCLUDES})
+  set(CMAKE_REQUIRED_LIBRARIES_SAVE ${CMAKE_REQUIRED_LIBRARIES})
+  set(CMAKE_REQUIRED_FLAGS_SAVE ${CMAKE_REQUIRED_FLAGS})
+  # Set flags for building test program
+  set(CMAKE_REQUIRED_INCLUDES ${MPI_INCLUDE_PATH})
+  set(CMAKE_REQUIRED_LIBRARIES ${MPI_LIBRARIES})
+  set(CMAKE_REQUIRED_FLAGS ${MPI_COMPILE_FLAGS})
+
+  include(CheckCSourceRuns)
+  set(MPI_C_TEST_MULTIPLE_SOURCE "
+#include <stdio.h>
+#include <mpi.h>
+
+int main(int argc, char **argv) {
+  int provided;
+
+  MPI_Init_thread(&argc, &argv, MPI_THREAD_MULTIPLE, &provided);
+
+  if (MPI_THREAD_MULTIPLE > provided) {
+    fprintf(stderr,\"MPI implementation is not supporting MPI_THREAD_MULTIPLE\");
+    MPI_Finalize();
+    return 1000+MPI_THREAD_MULTIPLE-provided;
+  }
+  MPI_Finalize();
+  return 0;
+}
+")
+
+  set(MPI_C_TEST_SERIALIZED_SOURCE "
+#include <stdio.h>
+#include <mpi.h>
+
+int main(int argc, char **argv) {
+  int provided;
+
+  MPI_Init_thread(&argc, &argv, MPI_THREAD_SERIALIZED, &provided);
+
+  if (MPI_THREAD_SERIALIZED > provided) {
+    printf(\"MPI implementation is not supporting MPI_THREAD_SERIALIZED\");
+    MPI_Finalize();
+    return 1;
+  }
+  MPI_Finalize();
+  return 0;
+}
+")
+
+  set(MPI_C_TEST_FUNNELED_SOURCE "
+#include <stdio.h>
+#include <mpi.h>
+
+int main(int argc, char **argv) {
+  int provided;
+
+  MPI_Init_thread(&argc, &argv, MPI_THREAD_FUNNELED, &provided);
+
+  if (MPI_THREAD_FUNNELED > provided) {
+    printf(\"MPI implementation is not supporting MPI_THREAD_FUNNELED\");
+    MPI_Finalize();
+    return 1;
+  }
+  MPI_Finalize();
+  return 0;
+}
+")
+
+  check_c_source_runs("${MPI_C_TEST_MULTIPLE_SOURCE}" MULTIPLE_TEST_RUNS)
+  if(NOT MULTIPLE_TEST_RUNS)
+    check_c_source_runs("${MPI_C_TEST_SERIALIZED_SOURCE}" SERIALIZED_TEST_RUNS)
+    if(NOT SERIALIZED_TEST_RUNS)
+      check_c_source_runs("${MPI_C_TEST_FUNNELED_SOURCE}" FUNNELED_TEST_RUNS)
+      if(NOT FUNNELED_TEST_RUNS)
+        set(MPI_THREAD_SUPPORTED_LEVEL "MPI_THREAD_SINGLE")
+      else(NOT FUNNELED_TEST_RUNS)
+        set(MPI_THREAD_SUPPORTED_LEVEL "MPI_THREAD_FUNNELED")
+      endif(NOT FUNNELED_TEST_RUNS)
+    else(NOT SERIALIZED_TEST_RUNS)
+      set(MPI_THREAD_SUPPORTED_LEVEL "MPI_THREAD_SERIALIZED")
+    endif(NOT SERIALIZED_TEST_RUNS)
+  else(NOT MULTIPLE_TEST_RUNS)
+    set(MPI_THREAD_SUPPORTED_LEVEL "MPI_THREAD_MULTIPLE")
+  endif(NOT MULTIPLE_TEST_RUNS)
+  # Set flags for building test program
+  set(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES_SAVE})
+  set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES_SAVE})
+  set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS_SAVE})
+endif(MPI_FOUND)
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