Merge pull request #6 from chuckatkins/add-mpi-dependency

Add mpi dependency

CMakeLists.txt

@@ -4,6 +4,14 @@
 #------------------------------------------------------------------------------#
 
 cmake_minimum_required(VERSION 3.7)
+
+# Fail immediately if not using an out-of-source build
+if(CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_CURRENT_BINARY_DIR)
+  message(FATAL_ERROR
+    "In-source builds are not supported.  Please create a build directory "
+    "separate from the source directory")
+endif()
+
 project(ADIOS VERSION 2.0.0)
 
 #------------------------------------------------------------------------------#
@@ -50,6 +58,16 @@ if(ADIOS_ENABLE_PIC)
   set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 endif()
 
+# MPI
+option(ADIOS_USE_MPI "Enable the MPI version of ADIOS" ON)
+if(ADIOS_USE_MPI)
+  find_package(MPI COMPONENTS C)
+  if(NOT MPI_FOUND)
+    message(WARNING "Unable to find MPI.  Disabling ADIOS_USE_MPI")
+    set(ADIOS_USE_MPI OFF CACHE BOOL "Enable the MPI version of ADIOS" FORCE)
+  endif()
+endif()
+
 #------------------------------------------------------------------------------#
 # Third party libraries
 #------------------------------------------------------------------------------#

thirdparty/CMakeLists.txt

@@ -14,14 +14,22 @@ set(EP_ARGS
 
 # Use Google Test for a unit testing framework
 cmake_dependent_option(ADIOS_USE_SYSTEM_GOOGLETEST
-  "Use a system-supplied Google Test framework" OFF
+  "Use a system-supplied Google Test framework" ON
   "BUILD_TESTING" OFF)
 if(BUILD_TESTING)
-  if(NOT ADIOS_USE_SYSTEM_GOOGLETEST)
-    add_subdirectory(googletest)
+  if(ADIOS_USE_SYSTEM_GOOGLETEST)
+    find_package(GTest REQUIRED)
+    if(NOT GTEST_FOUND)
+      message(WARNING
+        "Unable to find Google Test framework.  "
+        "Using an internal version")
+      set(ADIOS_USE_SYSTEM_GOOGLETEST OFF
+        CACHE BOOL "Use a system-supplied Google Test framework" FORCE)
+    endif()
   endif()
-  find_package(GTest REQUIRED)
   if(NOT ADIOS_USE_SYSTEM_GOOGLETEST)
+    add_subdirectory(googletest)
+    find_package(GTest REQUIRED)
     add_dependencies(GTest::GTest googletest)
     add_dependencies(GTest::Main googletest)
   endif()