#3435: ghc-stage2 panic while compiling ghc-paths-0.1.0.5
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Reporter: jsch | Owner: simonmar
Type: bug | Status: new
Priority: high | Milestone: 6.12.1
Component: Compiler | Version: 6.11
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Linux
Architecture: x86 |
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Changes (by simonmar):
* priority: normal => high
* difficulty: => Unknown
* owner: => simonmar
* milestone: => 6.12.1
Comment:
There are two things going on here. The panic is because GHC has tried to
read an interface file generated by an older version of GHC (do you have
any idea how this happened?).
The second thing is that GHC is supposed to report a helpful error message
rather than panic when it reads an old interface file. I've been
suspicious that this isn't working properly for some time, given the
number of panics we've been seeing. I think I now understand what's
happened. The external binary format for `Int` was changed recently on
32-bit platforms to be the same as on 64-bit platforms; unfortunately
because GHC reads an `Int` before the version check on the `.hi` file, GHC
sees a corrupt binary representation for the version and panics while
reading it.
So I'll fix the binary format to be stable again; unfortunately this will
also change the binary format once more, so we'll have another round of
panics before things settle down (note this is only an issue if you're
working with HEAD, not a released version of GHC).
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3435#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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