message: try to make stdc++fs multiplatform
diff: @@ -41,6 +41,13 @@ set_target_properties(hdlConvertor_core_static
  # [note] hdlConvertor_core_static and hdlConvertor_cpp_static has to be separated
  # otherwise it is not possible to link this library
  add_library(hdlConvertor_cpp_static STATIC ${hdlConvertor_cpp_SRC})
  +
  +if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
  + set(CPP_STD_FILESYSTEM_LIB_NAME c++experimental)
  +elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
  + set(CPP_STD_FILESYSTEM_LIB_NAME stdc++fs)
  +endif()
  +
  target_link_libraries(hdlConvertor_cpp_static
  svConvertor_static
  verilogConvertor_static
  @@ -48,7 +55,7 @@ target_link_libraries(hdlConvertor_cpp_static
  vhdlConvertor_static
  hdlConvertor_core_static
  ${ANTLR4CPP_LIBRARIES}
  - stdc++fs
  + ${CPP_STD_FILESYSTEM_LIB_NAME}
  )
  set_target_properties(hdlConvertor_cpp_static
  PROPERTIES VERSION "1.0.0"
  