On Mon, Mar 16, 2009 at 2:47 PM, Duncan Coutts <duncan.cou...@worc.ox.ac.uk>wrote:
> On Mon, 2009-03-16 at 12:13 +0000, Simon Marlow wrote: > > > > This sounds like a chicken and egg problem. To know which package > > > include directories to use GHCi needs to know which packages your > module > > > uses. However to work out which packages it needs it has to load the > > > module which means pre-processing it! > > > > > > With cabal we get round this problem because Cabal calls ghc with > > > -package this -package that etc and so when ghc cpp's the module it > does > > > know which package include directories to look in. > > > > Perhaps I'm missing something, but if applicative-numbers is an exposed > > package, shouldn't we be adding its include-dirs when invoking CPP? > > Yes, if we know we're using it. If we specify -package blah on the > command line then we do know we're using it and everything works > (because ghc uses the include-dirs when it calls cpp). If we don't > specify -package then ghc does not know we need the package until after > import chasing is done. Import chasing requires that we run cpp on > the .hs file first and that brings us full circle. > > Duncan Unless you drop the cpp-first requirement and have import-chasing look into #include'd files, as I described earlier. - Conal
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