if (NOT MPI_C_FOUND)
  find_package(MPI REQUIRED)

  set(CMAKE_C_COMPILE_FLAGS ${CMAKE_C_COMPILE_FLAGS} ${MPI_C_COMPILE_FLAGS})
  set(CMAKE_C_LINK_FLAGS ${CMAKE_C_LINK_FLAGS} ${MPI_C_LINK_FLAGS})
  set(CMAKE_Fortran_COMPILE_FLAGS ${CMAKE_Fortran_COMPILE_FLAGS} ${MPI_Fortran_COMPILE_FLAGS})
  set(CMAKE_Fortran_LINK_FLAGS ${CMAKE_Fortran_LINK_FLAGS} ${MPI_Fortran_LINK_FLAGS})
  include_directories(BEFORE ${MPI_C_INCLUDE_PATH} ${MPI_Fortran_INCLUDE_PATH})
endif()

if("${CMAKE_Fortran_COMPILER_ID}" STREQUAL "GNU")
  set(gfortran_compiler true)
endif()

include(CheckIncludeFile)
CHECK_INCLUDE_FILE("alloca.h" HAVE_ALLOCA)
if(NOT HAVE_ALLOCA)
  add_definitions(-DALLOCA_MISSING)
  message(WARNING "Could not find <alloca.h>. Assuming functionality is provided elsewhere.")
endif()

set(old_cmake_required_includes "${CMAKE_REQUIRED_INCLUDES}")
if(CMAKE_REQUIRED_INCLUDES)
  set(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES};${MPI_C_INCLUDE_PATH})
else()
  set(CMAKE_REQUIRED_INCLUDES ${MPI_C_INCLUDE_PATH})
endif()
set(old_cmake_required_flags "${CMAKE_REQUIRED_FLAGS}")
if(CMAKE_REQUIRED_FLAGS)
  set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS};${MPI_C_COMPILE_FLAGS};${MPI_C_LINK_FLAGS})
else()
  set(CMAKE_REQUIRED_FLAGS ${MPI_C_COMPILE_FLAGS};${MPI_C_LINK_FLAGS})
endif()
set(old_cmake_required_libraries "${CMAKE_REQUIRED_LIBRARIES}")
if(CMAKE_REQUIRED_LIBRARIES)
  set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES};${MPI_C_LIBRARIES})
else()
  set(CMAKE_REQUIRED_LIBRARIES ${MPI_C_LIBRARIES})
endif()

set(MPI_HEADERS mpi.h)
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()

set(CMAKE_REQUIRED_INCLUDES ${old_cmake_required_includes})
set(CMAKE_REQUIRED_FLAGS ${old_cmake_required_flags})
set(CMAKE_REQUIRED_LIBRARIES ${old_cmake_required_libraries})

#---------------------------------------------------
# Windows Intel MPI compatibility, see GH issue #435
#---------------------------------------------------
set(old_cmake_required_includes "${CMAKE_REQUIRED_INCLUDES}")
if(CMAKE_REQUIRED_INCLUDES)
  set(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES};${MPI_C_INCLUDE_PATH})
else()
  set(CMAKE_REQUIRED_INCLUDES ${MPI_C_INCLUDE_PATH})
endif()
CHECK_INCLUDE_FILES("mpi.h" HAVE_MPI_H)

include(CheckSymbolExists)
CHECK_SYMBOL_EXISTS(I_MPI_VERSION "mpi.h" HAVE_Intel_MPI)
if(HAVE_Intel_MPI AND WIN32)
  add_definitions(-DUSE_GCC)
endif()
set(CMAKE_REQUIRED_INCLUDES ${old_cmake_required_includes})

set(PSBLAS_SO_VERSION 0)
if(gfortran_compiler)
  if(NOT CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 7.0.0)
    set(PSBLAS_SO_VERSION 2)
  elseif(NOT CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 6.0.0)
    set(PSBLAS_SO_VERSION 1)
  endif()
endif()

set(PSBLAS_MODDIR "${CMAKE_INSTALL_INCLUDEDIR}/${mod_dir_tail}")
set(MOD_DIR_FLAG "${CMAKE_Fortran_MODDIR_FLAG}")
set(MPI_LIBS "")
foreach( lib IN LISTS MPI_Fortran_LIBRARIES)
  set(MPI_LIBS "${MPI_LIBS} \"${lib}\"")
endforeach()
string(STRIP "${MPI_LIBS}" MPI_LIBS)

set(directory_list fileread hello kernel pargen torture util)
if (SERIAL_MPI)
  set(directory_list ${directory_list} serial)
endif()
foreach(directory ${directory_list})
  add_subdirectory("${directory}")
endforeach()