Linking to Haskell code from an external program
marlowsd at gmail.com
Mon Nov 17 07:28:08 EST 2008
Colin Paul Adams wrote:
> Embarassing - I simply forgot to include Fib.o in the link.
> So it links now (program crashes, but I can try to sort that out).
> I'm still intereted in knowing how to automatically get the list of
> required libraries.
>>>>>> "Colin" == Colin Paul Adams <colin at colina.demon.co.uk> writes:
> Colin> I am trying to call a Haskell function from an Eiffel
> Colin> program, using C as an intermediary.
> Colin> For starters, I compiled and ran a variation of the program
> Colin> shown in
> Colin> http://haskell.org/haskellwiki/Calling_Haskell_from_C, to
> Colin> make sure I had the C-code right.
> Colin> I then attempted to move it into Eiffel. I can compile the
> Colin> C code OK, but I'm running into problems with linking.
> Colin> I solved most of the problems by adding the -v flag to the
> Colin> call to ghc which I used to link the original (haskell + c
> Colin> only) program, and cut-and-paste the linker options from
> Colin> their into the Eiffel configuration file. This isn't really
> Colin> satisfactory - I would like some automatic way to determine
> Colin> what the flags should be.
The only other way I can think of is to construct the arguments yourself by
querying the package database, e.g. "ghc-pkg field ld-options rts", but
you'll have to combine the information from several different fields of the
packages you use, and basically reproduce what GHC does to construct the ld
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