[ moving to haskell-cafe@haskell.org ]
Claus Reinke wrote:
This is due to the way GHC is installed on Windows, the package
database doesn't have hardcoded pathnames, the idea being that you can
move your GHC anywhere in the filesystem and it will still work.
this is an essential feature (for instance, running GHC from a USB or
network drive, or just unpacking snapshots without using installers),
please do not start splicing in absolute paths!
Don't worry, we don't intend to do that.
Unfortunately this means that Haddock can't find the documentation for
the packages.
this part I do not understand - if GHC and ghc-pkg can find the
packages, why can't Haddock? wouldn't it just be a case of making
$topdir be in a fixed relationship to the output of "ghc --print-libdir"?
well yes, but Haddock doesn't invoke 'ghc --print-libdir'. I think it would be
better for ghc-pkg to hide $topdir from everyone by replacing it with its value
in any ghc-pkg output. After all, $topdir is just a hack to make the GHC tree
location-independent on Windows, it's not a documented feature of the package
system.
or should there be a way to query ghc-pkg for the list of package
location roots? as you say, the main docs will be in a known location
relative to GHC, but perhaps docs in general should be be in a known
location relative to their packages, which ghc-pkg (or other tools for
other implementations) should be able to locate?
One workaround is to specify the paths by hand, using Haddock's
--read-interface flag. You're using Haddock via Cabal though, so that
doesn't work too well. The other workaround is to find GHC's
package.conf file and replace the string $topdir with the literal path
("c:/ghc/ghc-6.6" in your case - perhaps you have to append "/doc" for
the haddock fields, though).
will all docs be moved into "`ghc --print-libdir`\\doc"?
No. Docs can be installed wherever you like. Cabal has a policy for
installation locations on Windows, which you can override if you want.
> what about
local/user package databases?
Same here, you can install things wherever you like. In fact, installing things
inside the GHC tree isn't recommended.
Cheers,
Simon
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