update MTL cmake find module to support openMP

cmake/modules/FindMTL.cmake

@@ -27,7 +27,7 @@ find_path(MTL_INCLUDE_DIR boost/numeric/mtl/mtl.hpp
     mtl mtl4
 )
 
-set(MTL_COMPILE_DEFINITIONS MTL_ASSERT_FOR_THROW=1)
+set(MTL_COMPILE_DEFINITIONS "MTL_ASSERT_FOR_THROW")
 foreach(feature "MOVE" "AUTO" "RANGEDFOR" "INITLIST" "STATICASSERT" "DEFAULTIMPL")
   list(APPEND MTL_COMPILE_DEFINITIONS MTL_WITH_${feature})
 endforeach(feature)
@@ -56,6 +56,12 @@ if(MTL_FOUND AND NOT TARGET MTL::MTL)
     target_link_libraries(MTL::MTL INTERFACE HYPRE::HYPRE)
   endif ()
 
+	find_package(OpenMP)
+  if (OpenMP_CXX_FOUND)
+    list(APPEND MTL_COMPILE_DEFINITIONS "MTL_WITH_OPENMP")
+    target_link_libraries(MTL::MTL INTERFACE OpenMP::OpenMP_CXX)
+  endif ()
+
   set_target_properties(MTL::MTL PROPERTIES
     INTERFACE_INCLUDE_DIRECTORIES "${MTL_INCLUDE_DIR}"
     INTERFACE_COMPILE_DEFINITIONS "${MTL_COMPILE_DEFINITIONS}")