Improve "Unacceptable argument type in foreign declaration" error message

Using ghc 1ece7b27, zlib fails to build,

$ cabal install zlib
Resolving dependencies...
Configuring zlib-0.5.3.1...
Preprocessing library zlib-0.5.3.1...
Building zlib-0.5.3.1...
[1 of 5] Compiling Codec.Compression.Zlib.Stream ( dist/build/Codec/Compression/Zlib/Stream.hs, dist/build/Codec/Compression/Zlib/Stream.o )

Codec/Compression/Zlib/Stream.hsc:857:1:
    Unacceptable argument type in foreign declaration: CInt
    When checking declaration:
      foreign import ccall unsafe "static zlib.h inflateInit2_" c_inflateInit2_
        :: StreamState -> CInt -> Ptr CChar -> CInt -> IO CInt

Codec/Compression/Zlib/Stream.hsc:857:1:
    Unacceptable argument type in foreign declaration: CInt
    When checking declaration:
      foreign import ccall unsafe "static zlib.h inflateInit2_" c_inflateInit2_
        :: StreamState -> CInt -> Ptr CChar -> CInt -> IO CInt

Codec/Compression/Zlib/Stream.hsc:857:1:
    Unacceptable result type in foreign declaration: IO CInt
    Safe Haskell is on, all FFI imports must be in the IO monad
    When checking declaration:
      foreign import ccall unsafe "static zlib.h inflateInit2_" c_inflateInit2_
        :: StreamState -> CInt -> Ptr CChar -> CInt -> IO CInt

Codec/Compression/Zlib/Stream.hsc:865:1:
    Unacceptable argument type in foreign declaration: CInt
    When checking declaration:
      foreign import ccall unsafe "static zlib.h inflate" c_inflate
        :: StreamState -> CInt -> IO CInt

Codec/Compression/Zlib/Stream.hsc:865:1:
    Unacceptable result type in foreign declaration: IO CInt
    Safe Haskell is on, all FFI imports must be in the IO monad
    When checking declaration:
      foreign import ccall unsafe "static zlib.h inflate" c_inflate
        :: StreamState -> CInt -> IO CInt

Codec/Compression/Zlib/Stream.hsc:872:1:
    Unacceptable argument type in foreign declaration: CInt
    When checking declaration:
      foreign import ccall unsafe "static zlib.h deflateInit2_" c_deflateInit2_
        :: StreamState
           -> CInt
              -> CInt -> CInt -> CInt -> CInt -> Ptr CChar -> CInt -> IO CInt

Codec/Compression/Zlib/Stream.hsc:872:1:
    Unacceptable argument type in foreign declaration: CInt
    When checking declaration:
      foreign import ccall unsafe "static zlib.h deflateInit2_" c_deflateInit2_
        :: StreamState
           -> CInt
              -> CInt -> CInt -> CInt -> CInt -> Ptr CChar -> CInt -> IO CInt

Codec/Compression/Zlib/Stream.hsc:872:1:
    Unacceptable argument type in foreign declaration: CInt
    When checking declaration:
      foreign import ccall unsafe "static zlib.h deflateInit2_" c_deflateInit2_
        :: StreamState
           -> CInt
              -> CInt -> CInt -> CInt -> CInt -> Ptr CChar -> CInt -> IO CInt

Codec/Compression/Zlib/Stream.hsc:872:1:
    Unacceptable argument type in foreign declaration: CInt
    When checking declaration:
      foreign import ccall unsafe "static zlib.h deflateInit2_" c_deflateInit2_
        :: StreamState
           -> CInt
              -> CInt -> CInt -> CInt -> CInt -> Ptr CChar -> CInt -> IO CInt

Codec/Compression/Zlib/Stream.hsc:872:1:
    Unacceptable argument type in foreign declaration: CInt
    When checking declaration:
      foreign import ccall unsafe "static zlib.h deflateInit2_" c_deflateInit2_
        :: StreamState
           -> CInt
              -> CInt -> CInt -> CInt -> CInt -> Ptr CChar -> CInt -> IO CInt

Codec/Compression/Zlib/Stream.hsc:872:1:
    Unacceptable argument type in foreign declaration: CInt
    When checking declaration:
      foreign import ccall unsafe "static zlib.h deflateInit2_" c_deflateInit2_
        :: StreamState
           -> CInt
              -> CInt -> CInt -> CInt -> CInt -> Ptr CChar -> CInt -> IO CInt

Codec/Compression/Zlib/Stream.hsc:872:1:
    Unacceptable result type in foreign declaration: IO CInt
    Safe Haskell is on, all FFI imports must be in the IO monad
    When checking declaration:
      foreign import ccall unsafe "static zlib.h deflateInit2_" c_deflateInit2_
        :: StreamState
           -> CInt
              -> CInt -> CInt -> CInt -> CInt -> Ptr CChar -> CInt -> IO CInt

Codec/Compression/Zlib/Stream.hsc:884:1:
    Unacceptable argument type in foreign declaration: CInt
    When checking declaration:
      foreign import ccall unsafe "static zlib.h deflate" c_deflate
        :: StreamState -> CInt -> IO CInt

Codec/Compression/Zlib/Stream.hsc:884:1:
    Unacceptable result type in foreign declaration: IO CInt
    Safe Haskell is on, all FFI imports must be in the IO monad
    When checking declaration:
      foreign import ccall unsafe "static zlib.h deflate" c_deflate
        :: StreamState -> CInt -> IO CInt
cabal: Error: some packages failed to install:
zlib-0.5.3.1 failed during the building phase. The exception was:
ExitFailure 1

Trac metadata

Trac field	Value
Version	7.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries (other)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Linux
Architecture	x86_64 (amd64)