#5307: Problems with new cyclic dependency error message
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Reporter: simonmar | Owner: simonpj
Type: bug | Status: new
Priority: highest | Milestone: 7.2.1
Component: Compiler | Version: 7.0.3
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by simonpj@…):
commit e85902183d290b3ee8bdd242d10bf60b963f3f28
{{{
Author: Simon Peyton Jones <[email protected]>
Date: Fri Jul 22 08:56:42 2011 +0100
Implement a findCycle function in Digraph,
and use it to report module loops nicely
This fixes Trac #5307. Now we get
Module imports form a cycle:
module `M8' (.\M8.hs)
imports `M1' (M1.hs)
which imports `M9' (.\M9.hs-boot)
which imports `M8' (.\M8.hs)
And the algorithm is linear time.
compiler/main/GhcMake.hs | 67 +++++++++++++---------------------
compiler/utils/Digraph.lhs | 85
+++++++++++++++++++++++++++++++++++++++----
compiler/utils/Util.lhs | 6 +++-
3 files changed, 107 insertions(+), 51 deletions(-)
}}}
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5307#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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