Working on a fix for ticket #89

[Stephen Blackheath [to cabal-devel]]

All,

Now I'm ready to submit this patch for consideration - I have attached
it in 'darcs send' format. Please review.

Here it is:
http://upcycle.it/~blackh/cabal/cabal-ticket-89-v4.darcs-send

It has test cases for the new logic, and some tests for old logic (to
make sure it behaves the same on 1.6.0.3 and HEAD).  To test:

cd tests
runhaskell suite

Tested on ghc-6.8.2 and ghc-6.10.2


Steve

Stephen Blackheath [to cabal-devel] wrote:
> All,
> 
> I'm working on a fix for ticket #89
> (http://hackage.haskell.org/trac/hackage/ticket/89), and I have a
> specific question for the list:
> 
> ----
> If I do this...
> 
> build-depends: base
> Library
>   build-depends: bytestring
> 
> ...then when the library compiles, it will fail to find the Prelude
> (i.e. -package base doesn't get passed to ghc).  Is there a reason why
> the global 'build-depends' doesn't add to all targets (i.e. all exes &
> libs)?  That's what I would expect it to do, but that might be just me.
> 
> Or more to the point, should this be fixed?
> ----
> 
> The code changes I'm working on also fix a couple of other things, so
> this is the complete list:
> 
>  - Ticket #89: Make it so the executable can depend on the library
> defined in the same package. If hs-source-dirs is used, you can avoid it
> compiling the .hs files multiple times.
> 
>  - Make it so build-depends: defined in a Library or Executable block
> affects only the build of those components, not all components as
> currently happens. For avoidance of package breakage, this behaviour
> only happens if you specify cabal-version: >= 1.7 (that is, versions
> less than 1.7 are entirely excluded).
> 
>  - Make a really simple unit test harness using the test-framework
> package, and add some test cases for the new behaviour. The idea is that
> we can gradually integrate existing tests (hunit & quickcheck) into it.
> 
>  - Make UnitTests compile (though hardly any of the tests pass).
> 
> This patch is not yet tidy enough to submit, but it is complete enough
> to actually work for GHC. I would welcome any comments. Here it is
> (against HEAD):
> 
> http://upcycle.it/~blackh/cabal/cabal-ticket-89-v3.patch
> 
> 
> Steve
>