使用 ghc 7.4.2 构建 gtk2hs-buildtools 时,我收到以下警告:
c2hs/toplevel/C2HSConfig.hs:110:1:
Warning: newtype `CInt' is used in an FFI declaration,
but its constructor is not in scope.
This will become an error in GHC 7.6.1.
When checking declaration:
foreign import ccall safe "static bitfield_direction" bitfield_direction
:: CInt
即使我有 FFI 调用,我也会收到类似的警告import Foreign.C.Types(CInt)
。
摆脱此警告的正确方法是什么?