[Haskell-cafe] Cabal builds file at top level incorrectly

[Roman Cheplyaka]

This appears to be a bug in ghc, not cabal.

Cabal correctly calls ghc with -i, which should empty the search path.
Apparently, that -i is ignored.

Please report this to ghc trac. (Feel free to copy this email as an
explanation.)

Roman

On 10/12/14 21:09, Tom Ellis wrote:
> Cabal's behaviour is strange to me.  My example cabal file is as follows:
> 
> name: break
> version: 0.1
> cabal-version: >= 1.2
> build-type: Simple
> 
> library
>     hs-source-dirs: src
>     build-depends:
>         base >= 4 && < 5
>     exposed-modules: Break
> 
> and I have a module `src/Break.hs` that I want it to compile.  That would
> work fine.  But if I have another file at the top-level caled `Break.hs` it
> compiles that one instead.  It also seems to want it to be an executable.
> 
> What's going on?
> 
> Full reproduction below.  You can see it is trying to compile `Break.hs` not
> `src/Break.hs`.
> 
> 
> % git clone https://github.com/tomjaguarpaw/break.git
> Cloning into 'break'...
> [...]
> % cd break 
> % cabal configure && cabal test                      
> Resolving dependencies...
> Configuring break-0.1...
> Re-configuring with test suites enabled. If this fails, please run configure
> manually.
> Resolving dependencies...
> Configuring break-0.1...
> Building break-0.1...
> Preprocessing library break-0.1...
> [1 of 1] Compiling Main             ( Break.hs, dist/build/Main.o )
> 
> Break.hs:1:1:
>     The function `main' is not defined in module `main:Main'
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