On 14 July 2005 17:47, Isaac Jones wrote:

"Simon Marlow" writes:

...

I just discovered a problem. In GHC > 6.4, local modules take precedence over package modules. This causes a problem for the Cabal distribution, eg:

$ ghc-6.4.1 Setup.lhs --make -o setup Chasing modules from: Setup.lhs ./Distribution/Simple.hs:61:1: lexical error

ie. it picks up Distribution.Simple from the local copy rather than the installed version. The solution is simple, if a little inconvenient: the Cabal sources have to move into a subdirectory of the distribution.

It's supposed to do this; use "make setup" (which just passes -cpp to ghc) to create the setup file. It bootstraps itself, but I could move the sources into a subdirectory anyway to make it possible to build it either way.

Yes, but the problem is that I can't do 'runghc Setup.lhs', because it fails as above. It works with GHC 6.4, though. Even if we fixed the compilation failures (perhaps with appropriate {-# OPTIONS #-} pragmas), 'runghc Setup.lhs' would still compile the whole of Cabal each time, which is sub-optimal. Putting the sources in a subdirectory would fix this infelicity, and you can still bootstrap using the Makefile. Cheers, Simon