message: Skip some warning for clang-cl
diff: @@ -278,6 +278,21 @@ target_include_directories(onnx_proto PUBLIC
  ${PROTOBUF_INCLUDE_DIRS})
  if (MSVC)
  + if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
  + set(EXTRA_FLAGS
  + "-Wno-implicit-function-declaration"
  + "-Wno-undefined-inline"
  + "-Wno-incompatible-pointer-types"
  + "-Wno-dllexport-explicit-instantiation-decl"
  + "-Wno-microsoft-unqualified-friend"
  + "-Wno-absolute-value"
  + "-Wno-unused-variable"
  + "-Wno-unknown-argument"
  + "-Wno-writable-strings"
  + "-Qunused-arguments")
  + else()
  + set(EXTRA_FLAGS "")
  + endif()
  if (BUILD_SHARED_LIBS OR ONNX_BUILD_MAIN_LIB)
  set(ONNX_API_DEFINE "-DONNX_API=__declspec(dllexport)")
  else()
  @@ -368,27 +383,11 @@ if(BUILD_ONNX_PYTHON)
  target_link_libraries(onnx_cpp2py_export PRIVATE onnx)
  if(MSVC)
  - if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
  - set(MP_FLAG "-Xclang" "-fopenmp")
  - set(EXTRA_FLAGS
  - "-Wno-implicit-function-declaration"
  - "-Wno-undefined-inline"
  - "-Wno-incompatible-pointer-types"
  - "-Wno-dllexport-explicit-instantiation-decl"
  - "-Wno-microsoft-unqualified-friend"
  - "-Wno-absolute-value"
  - "-Wno-unused-variable"
  - "-Wno-writable-strings"
  - "-Qunused-arguments")
  - else()
  - set(MP_FLAG "/MP")
  - set(EXTRA_FLAGS "")
  - endif()
  find_package(PythonInterp ${PY_VERSION} REQUIRED)
  find_package(PythonLibs ${PY_VERSION} REQUIRED)
  target_link_libraries(onnx_cpp2py_export PRIVATE ${PYTHON_LIBRARIES})
  target_compile_options(onnx_cpp2py_export
  - PRIVATE ${MP_FLAG}
  + PRIVATE /MP
  /WX
  /wd4800 # disable warning type' : forcing
  # value to bool 'true' or 'false'
  @@ -435,7 +434,7 @@ endif()
  if(MSVC)
  target_compile_options(onnx_proto
  - PRIVATE ${MP_FLAG}
  + PRIVATE /MP
  /WX
  /wd4800 # disable warning type' : forcing value
  # to bool 'true' or 'false'
  @@ -448,7 +447,7 @@ if(MSVC)
  # ite.h
  ${EXTRA_FLAGS})
  target_compile_options(onnx
  - PRIVATE ${MP_FLAG}
  + PRIVATE /MP
  /WX
  /wd4800 # disable warning type' : forcing value
  # to bool 'true' or 'false'
  