#789: build-depends on packages that provide no library
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Reporter: duncan | Owner:
Type: defect | Status: new
Priority: normal | Milestone:
Component: cabal-install tool | Version: HEAD
Severity: normal | Keywords:
Difficulty: unknown | Ghcversion:
Platform: |
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It is possible to list build-depends on packages that have just an
executable and no library. Currently the behaviour of cabal-install does
not consider this and it will allow such packages to be pulled in as
dependencies. It leads to problems however because the non-lib package
never gets registered with ghc-pkg and so it leads to re-install loops.
The solution is for cabal-install to not consider exe-only packages to be
valid for satisfying a build-depends requirement. It should produce a
suitable error message.
Note that it must take into account the posibility that a newer or older
version of a package may switch from exe only to exe+lib or just lib, or
indeed vica versa.
We should mark exe-only versions of the package as excluded with a reason.
Then if the dep is not satisfiable then we can explain why all the
excluded ones were excluded (ie due to not exposing a lib).
--
Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/789>
Hackage <http://haskell.org/cabal/>
Hackage: Cabal and related projects
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