Cabal - C sources in a subdirectory

[Isaac Jones]

Einar Karttunen <ekarttun at cs.helsinki.fi> writes:

> Hello
>
> I have problems with Cabal failing to build simple packages
> if C-Sources are inside a subdirectory.

Thanks for the report; this shouldn't be hard to fix.

> C-Sources: c_src/foo.c

I didn't anticipate doing this, but it makes sense, since you can't
specify the path names of executables with the dot syntax as you can
with Haskell sources.

> Build creates c_src/foo.o => dist/build/foo.o (from the 
> C-Sources build instruction in Distribution.Simple.Build).
> In the later stage it tries to look for the object file
> in dist/build/c_src/foo.o which fails.

My preference would be to fix the build stage so that it puts the .o
file in the place where the link stage is looking for it.  Otherwise,
I guess you could get .o files overwriting each-other if they have the
same name!

> A complete minimal example is at
> http://www.cs.helsinki.fi/u/ekarttun/haskell/cfail.tar.gz

Thanks.  I think I'll be able to fix this tonight.  Are you using the
tarball from the web page, or are you checking things out via darcs?

peace,

  isaac