#4900: DEPENDS pragma
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Reporter: cdsmith | Owner:
Type: feature request | Status: new
Priority: normal | Milestone: 7.4.1
Component: Build System | Version:
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by simonmar):
I think the proposed solution is fine. (note that a related problem was
fixed in GHC 7.2.1: see #481)
It will need some plumbing and some refactoring in GHC. The list of
depended-upon files has to be collected in the `Q` monad and stored in the
`ModIface`, and then we have to check the dates of those files when
deciding whether to recompile. The obvious place to do the check is in
`MkIface.checkOldIface`, but it doesn't have information about the
modification time of the object file - we would have to plumb that
information in, probably by elaborating the `SourceModified` parameter.
This would also be useful in fixing another bug we have: when using CPP,
we don't recompile when a `#included` file changes.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4900#comment:8>
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