[Haskell-cafe] trouble installing greencard -- -fno-prune-tydecls flag ( was Re: trivial function application question )

[Duncan Coutts]

On Sun, 2007-01-07 at 02:07 +0000, Ross Paterson wrote:
> On Sun, Jan 07, 2007 at 12:44:46PM +1100, Donald Bruce Stewart wrote:

> > Those new to Cabal always seem to assume things are going badly when
> > "happy not found". We need to address the psychological aspect
> > of Cabal's config process :)
> 
> But it's not enough to just say "Ignore any errors above".  Some packages
> really do need happy (or some other tool) to build.  Cabal would need to
> crawl over the source files to see what preprocessors are really needed.

Yes, this is exactly what Cabal should do. We need to do this to make
non-trivial pre-processors work properly anyway.

We need to have Cabal do the import chasing and work out which tools
will be necessary for the build.

Duncan