CMake: Add FLAMEGPU_ENABLE_MPI option.

src/CMakeLists.txt

@@ -86,6 +86,9 @@ option(FLAMEGPU_RTC_DISK_CACHE "Enable caching of RTC kernels to disk by default
 # Option to enable/disable logging of dynamic RTC files to disk
 option(FLAMEGPU_RTC_EXPORT_SOURCES "Export RTC source files to disk at runtime" OFF)
 
+# Option to enable/disable MPI support
+option(FLAMEGPU_ENABLE_MPI "Enable MPI support for distributed ensembles" OFF)
+
 # Option to make put glm on the include path
 option(FLAMEGPU_ENABLE_GLM "Experimental: Make GLM available to flamegpu2 projects on the include path" OFF)
 mark_as_advanced(FLAMEGPU_ENABLE_GLM)
@@ -510,6 +513,17 @@ if (FLAMEGPU_VISUALISATION)
     target_compile_definitions(${PROJECT_NAME} PUBLIC FLAMEGPU_VISUALISATION) 
 endif()
 
+if (FLAMEGPU_ENABLE_MPI)
+    find_package(MPI REQUIRED)
+    if (MPI_CXX_FOUND)
+        # This sets up include directories and lib
+        target_link_libraries(${PROJECT_NAME} PUBLIC MPI::MPI_CXX)
+    else()
+        message(FATAL_ERROR "MPI C++ Support was not found!")
+    endif()
+endif()
+
+
 # Make GLM accessible via include. PUBLIC so this is usable by downstream projects
 # @todo - make the vis cmake/glm create a target to use.
 if (FLAMEGPU_ENABLE_GLM)