GHC and Windows (DLL/FFI) woes

Simon Marlow simonmar at
Mon Oct 24 06:01:14 EDT 2005

On 23 October 2005 19:00, Esa Ilari Vuokko wrote:

> I have been trying to build some Windows DLLs with
> GHC, and I have run into some misfeatures or maybe
> I have misunderstood how to use GHC.  Any help or
> advice would be appreciated. :)
> First of all, I can't get ghc to generate stubs from
> foreign export in anywhere else than next to original
> source, which is sort of annoying.  I would like all
> the generated files to go quite a bit diffrent place than
> source directory.

We don't have a flag for that; perhaps we should.  Or perhaps there
should be a flag that says "put all generated files here", that subsumes
-odir, -hidir, -hcdir and also coveres _stub.{c,h} files.

> Next, --make and --mk-dll don't seem to work together.
> Ok, what I do, is I just --make -no-link and then --mk-dll
> all the object files I find :)

That's true.  This is closer to working in 6.5, we should make it work
(if anyone's interested, this just means hooking up
with DriverPipeline.doMkDLL in the right way).
> It seems that -i flag and compiling those _stub.c have
> following problem:  if path given in -i flag contains any
> /- or \-characters, i.e. any real subpaths, it seems to
> stop with something like:
> createDirectory: invalid argument (Invalid argument)
> It seems a bit random what is the supposed "filename"
> part of the path, typically it contains drive letter and few
> colons, it doesn't seem totally random data.

Could you give me a detailed description of the problem: the exact
command line, and the error message that is produced.  Thanks.


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