#4900: DEPENDS pragma
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Reporter: cdsmith | Owner:
Type: feature request | Status: patch
Priority: normal | Milestone: 7.6.1
Component: Compiler | Version:
Resolution: | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Difficulty: Unknown
Testcase: TH_Depends | Blockedby:
Blocking: | Related:
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Changes (by parcs):
* status: new => patch
Comment:
Replying to [comment:47 simonmar]:
> While looking at the patch I noticed something odd: in order to look up
the modification times of the "usage files" while constructing the
`ModSummary`, we have to look for the `ModIface` in the HPT. The first
time around, it won't be there, so we'll have `Nothing` for the
`ms_uf_date`, but the second time it will, which will force us to re-
summarise all the modules. This is very fishy. I'm worried about (a)
correctness when the module is not in the HPT, and (b) performance.
>
> I'm leaving the patch for now until I figure out the right thing to do.
It turns out that, very conveniently, the mtimes of a module's usage files
are already calculated during compilation. With that in mind, I have
created a new patch addresses this issue and also makes it a little
simpler to reason about.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4900#comment:50>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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