#3060: impossible internal bug while building darcs
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Reporter: quick | Owner:
Type: bug | Status: reopened
Priority: normal | Milestone:
Component: Compiler | Version: 6.10.1
Severity: minor | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Linux
Architecture: x86 |
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Comment (by duncan):
GHC-6.10.1 bundles unix-2.3.1.0. There are several other installed
packages that come with ghc-6.10.1 that depend on unix-2.3.1.0. You cannot
in general substitute an installed package without also rebuilding all the
other packages that depend on it. There is no guarantee that you can
rebuild the package and get the same ABI as previously.
In this case you are fortunate that you get errors at compile time due to
mismatches in .hi files rather than linker errors or segfaults.
At the moment we do not track ABIs so Cabal and ghc-pkg do not prevent you
from doing unwise things. The short term solution is to "not do that". The
medium term solution is to track the ABI and use it as a check. The longer
term solution is to allow installing multiple instances based on their
ABI.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3060#comment:9>
GHC <http://www.haskell.org/ghc/>
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