On Sat, 2008-08-16 at 13:51 -0400, Isaac Dupree wrote:
> Duncan Coutts wrote:
> > [...]
> >
> > I'm not saying it's a problem with your proposal, I'd just like it to be
> > taken into account. For example do dependency chasers need to grok just
> > import lines and {-# SOURCE -#} pragmas or do they need to calculate
> > fixpoints.
>
> Good point. What does the dependency chaser need to figure out?
> - exactly what dependency order files must be compiled
> (e.g., ghc -c) ?
> - what files (e.g., .hi) are needed to be findable by the
> e.g. (ghc -c) ?
> - recompilation avoidance?
It needs to work out which files the compiler will read when it compiles
that module.
So currently, I think we just have to read a single .hs file and
discover what modules it imports. We then can map those to .hi
or .hs-boot files in one of various search dirs or packages.
We also need to look at {#- SOURCE #-} import pragmas since that means
we look for a different file to ordinary imports.
Calculating dependency order and recompilation avoidance are things the
dep program has to do itself anyway. The basics is just working out what
things compiling a .hs file depends on. Obviously it's somewhat
dependent on the Haskell implementation.
Duncan
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