[Haskell-cafe] Re: Resolved: ffi linking problem

[Simon Marlow]

jeff p wrote:
>  In case anyone else finds this useful...
> 
>  My linking problem was finally resolved by using the -fvia-C flag
> when compiling with ghc.
> 
> Thanks to Stefan O'Rear who pointed out the possibility and wrote:
>>
>> Does using -fvia-C help at all?  The C compiler understands header
>> files and is sometimes better equipped to resolve things.

If -fvia-C fixes your problem, then your code has a bug, strictly speaking.  If 
your foreign call requires some information from a header file, then the right 
way to call it is by making a small C wrapper function and calling that.

Bear in mind that we'll be deprecating -fvia-C in the future, and also that you 
might want your code to work in GHCi too, which doesn't read any header files 
when compiling foreign imports.

Cheers,
	Simon