#1372: Recompilation checker should consider package versions (and other
factors)
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Reporter: bringert | Owner: simonmar
Type: bug | Status: new
Priority: normal | Milestone: 6.8 branch
Component: Compiler | Version: 6.6
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Os: Unknown | Testcase:
Architecture: Unknown |
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Comment (by simonmar):
Replying to [comment:14 duncan]:
Yes, currently Cabal does not notice when the .cabal file has been
updated without
doing configure again. So cabal-setup build is not enough, you have to
cabal-setup
configure && cabal-setup build. I'd like to include this feature in the
Cabal
dependency analysis project, ie it should automatically rebuild the
appropriate
things depending on what has been changed in the .cabal file.
This would be pretty easy to do in Cabal as it stands, right? I can
submit a patch if you agree.
As for Cabal doing dependency analysis for packages, it does not need to
be as
accurate as ghc, so long as it is conservatively inaccurate. Then it'll
invoke ghc
which might decide that there's nothing to do afterall.
To be conservative and still not invoke GHC on every file, you'd have to
check the modification times on the `.hi` files of all package
dependencies (possibly all the `.hi` files rather than just the ones that
are directly imported, I'm not sure).
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1372#comment:15>
GHC <http://www.haskell.org/ghc/>
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