As I understand it, Cabal hides all packages by default. If a package is not in your dependencies, it won't be available to the build, no matter the status in ghc-pkg.
(Incidentally, this had neat consequences in the past, since it means that packages being hidden in ghc-pkg also does not make them unavailable to cabal. I spent some time at a previous employer attempt to debug a build failure where it turned out that the developer experiencing the failure had not pulled all the changes. In particular, we had packages A, B, and C, where C depended on A and B, and B depended on A. The developer had pulled updates to A and C, but not B. A built and installed a new version, hiding B (which was based on an old version). The developer the build C. Cabal started with everything hidden, then revealed A and B as specified by C's cabal file, and the predictable build failures resulted. I have not tried this with GHC/Cabal builds since 6.4.2, so this is probably no longer possible.) /g On Nov 20, 2007 2:18 PM, Greg Fitzgerald <[EMAIL PROTECTED]> wrote: > Using GHC 6.8.1 on Windows XP, after having used ghc-pkg to expose > 'directory-1.0.0.0', I am getting an error when I build haddock that says > the package is hidden. When I type "ghc-pkg list", the package is not in > parenthesis. Typing "ghc -v" says that it is using the file from > "C:\ghc\ghc- 6.8.1\package.conf". That package.conf file has the 'exposed' > set to True for that file. Why does GHC still think the package is hidden? > > ...\haddock-0.8>runhaskell Setup.lhs configure > Configuring haddock-0.8... > > ...\haddock-0.8>runhaskell Setup.lhs build > Preprocessing executables for haddock-0.8... > shift/reduce conflicts: 5 > Building haddock-0.8... > > src/Main.hs:49:7: > Could not find module `System.Directory': > it is a member of package directory-1.0.0.0, which is hidden > > ...\haddock-0.8>ghc-pkg list > C:/ghc/ghc-6.8.1\package.conf: > Cabal-1.2.2.0, HUnit-1.2.0.0, OpenGL-2.2.1.1, QuickCheck-1.1.0.0, > Win32-2.1.0.0, array-0.1.0.0, base-3.0.0.0, bytestring-0.9.0.1, > cgi-3001.1.5.1, containers-0.1.0.0, directory-1.0.0.0, fgl-5.4.1.1, > filepath-1.1.0.0, (ghc-6.8.1), haskell-src-1.0.1.1, > haskell98-1.0.1.0 , hpc-0.5.0.0, html-1.0.1.1, mtl-1.1.0.0, > network-2.1.0.0, old-locale-1.0.0.0, old-time-1.0.0.0, > packedstring-0.1.0.0, parallel-1.0.0.0, parsec-2.1.0.0, > pretty-1.0.0.0, process-1.0.0.0, random-1.0.0.0 , > regex-base-0.72.0.1, regex-compat-0.71.0.1, regex-posix-0.72.0.1, > rts-1.0, stm-2.1.1.0, template-haskell-2.2.0.0, time-1.1.2.0, > xhtml-3000.0.2.1 > > Thanks, > Greg > > _______________________________________________ > Glasgow-haskell-users mailing list > [email protected] > http://www.haskell.org/mailman/listinfo/glasgow-haskell-users > > -- The man who'd introduced them didn't much like either of them, though he acted as if he did, anxious as he was to preserve good relations at all times. One never knew, after all, now did one now did one now did one. _______________________________________________ Glasgow-haskell-users mailing list [email protected] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
