set CMake policy to auto-enable rpath on MacOS (#348)

Author: matekelemen

CMakeLists.txt

@@ -124,8 +124,7 @@ message("CMAKE_CXX_FLAGS:" ${CMAKE_CXX_FLAGS})
 message("CMAKE_C_FLAGS:" ${CMAKE_C_FLAGS})
 
 if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
-    # to suppress warning "MACOSX_RPATH is not specified for the following targets"
-    set(CMAKE_MACOSX_RPATH 0)
+    cmake_policy(SET CMP0042 NEW)
 endif()
 
 # clean the bin directory