#2057: inconsistent .hi file error gets ignored
------------------------+---------------------------------------------------
Reporter: duncan | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.8.2 | Severity: normal
Keywords: | Testcase:
Architecture: Unknown | Os: Unknown
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{{{
[20 of 20] Compiling Main ( ./Main.hs, dist/build/cabal/cabal-
tmp/Main.o )
The interface for `main:Hackage.Config'
Declaration for savedConfigToConfigFlags
Unfolding of Hackage.Config.savedConfigToConfigFlags:
Can't find interface-file declaration for variable
Distribution.Simple.Setup.a401
Probable cause: bug in .hi-boot file, or inconsistent .hi file
Use -ddump-if-trace to get an idea of which file caused the error
Linking dist/build/cabal/cabal ...
dist/build/cabal/cabal-tmp/Hackage/Config.o: In function `sfsu_info':
(.text+0x70cc): undefined reference to
`Cabalzm1zi3zi3_DistributionziSimpleziSetup_a401_closure'
dist/build/cabal/cabal-tmp/Hackage/Config.o: In function `rf7U_closure':
(.data+0xf28): undefined reference to
`Cabalzm1zi3zi3_DistributionziSimpleziSetup_a401_closure'
collect2: ld returned 1 exit status
}}}
Now, the inconsistent .hi file was entirely my fault. However note that
`ghc --make` did not stop at the error! It continued and tried to link.
This is bad because sometimes linker errors are very long and a user might
loose the real source of the error.
The error gets raised in `iface/TcIface.lhs` by `importDecl`. The uses of
that function look like they are translating the error into failure in
other monads ok. It's not immediately obvious at what point in the
propagation of this error it gets ignored and linking continues
irrespective.
It should not be too hard to reproduce I hope. Generating inconsistent .hi
files is fairly easy to do. In this case I just built cabal-install
against an existing Cabal. Then rebuilt and re-registered a slightly
changed Cabal lib. Then did another build of cabal-install without
cleaning first.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2057>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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