message: silence the attribute warning from antrl4
diff: @@ -27,6 +27,8 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
  if(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /bigobj")
  +elseif(CMAKE_SYSTEM_NAME MATCHES "Linux")
  + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -pedantic -W -Wno-attributes")
  endif()
  include_directories( ${HDLCONVERTOR_SOURCE_DIR}/antlr4/runtime/src )
  