#2841: Ghci + foreign export declarations result in undefined symbols
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Reporter: fasta | Owner:
Type: bug | Status: new
Priority: normal | Milestone: _|_
Component: Compiler (FFI) | Version: 6.10.1
Severity: major | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Linux
Architecture: Unknown/Multiple |
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Comment (by simonmar):
please create a new ticket describing ''exactly'' the sequence of actions
that lead to the error. I haven't been able to reproduce the error you
mentioned from the information you give above.
{{{
~/scratch > cat 2841.hs
{-# LANGUAGE ForeignFunctionInterface #-}
module M2841 where
-- save in a file New.hs
foreign export ccall foo :: Int -> IO Int -- add this line and ghci will
return something like New_stub.o: unknown symbol
`Main_zdffoozuaIc_closure'
-- if you first try without the line, it works. If you still have stub
files in the current directory, it will fail with the same message as
before.
foo :: Int -> IO Int
foo = return . length . f
f :: Int -> [Int]
f 0 = []
f n = n:(f (n-1))
test = 1
~/scratch > ghc -c 2841.hs
compilation IS NOT required
~/scratch > ghci 2841.hs
GHCi, version 6.10.1: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer ... linking ... done.
Loading package base ... linking ... done.
$HOME/.ghci
Ok, modules loaded: M2841.
Prelude M2841> foo 3
3
Prelude M2841> f 1
[1]
Prelude M2841> test
1
Prelude M2841>
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2841#comment:3>
GHC <http://www.haskell.org/ghc/>
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