On 10-11-30 05:19 AM, Ketil Malde wrote:
It seems to me that while there are *three* ways to install stuff: apt-get install, cabal install --global, and cabal install --user, there are just *two* ways things get installed, globally and user(ly?).
The "obvious" solution would be to have three package.confs as well, say "system" (/var/lib), "global" (/usr/lib?), and "user" (~/.ghc). Is there a fundamental limitation of GHC or something that makes it impossible to work with three package configuration files? Or would this not solve anything after all?
GHC is glad to take more databases, using -package-conf and GHC_PACKAGE_PATH. http://www.haskell.org/ghc/docs/latest/html/users_guide/packages.html#packag... However, all tricks of installing a million instances of binary-0.5.0.2 are in vain — GHC will still pick one instance by a priority rule and ignore the rest.