cabal install puts .hi files in wrong directory

[cppljevans]

On my unbuntu OS, cabal install catagory-extras put the files as shown here:

[ 99 of 100] Compiling Control.Morphism.Exo ( src/Control/Morphism/Exo.hs, dist/build/Control/Morphism/Exo.o )
[100 of 100] Compiling Control.Morphism.Meta.Erwig ( src/Control/Morphism/Meta/Erwig.hs, dist/build/Control/Morphism/Meta/Erwig.o )
/usr/bin/ar: creating dist/build/libHScategory-extras-0.53.5.a
Installing library in /root/.cabal/lib/category-extras-0.53.5/ghc-6.8.2
Registering category-extras-0.53.5...
Reading package info from "dist/installed-pkg-config" ... done.
Saving old package config file... done.
Writing new package config file... done.

whereas with manual install, they're put as shown here:

[12 of 12] Compiling Data.Generics.UniplateOn ( Data/Generics/UniplateOn.hs, dist/build/Data/Generics/UniplateOn.o )
/usr/bin/ar: creating dist/build/libHSuniplate-1.2.0.1.a

# runhaskell Setup install
Installing library in /usr/local/lib/uniplate-1.2.0.1/ghc-6.8.2
Registering uniplate-1.2.0.1...
Reading package info from "dist/installed-pkg-config" ... done.
Saving old package config file... done.
Writing new package config file... done.

When I compile with ghc, ghc cannot find the /root/.cabal files. If the -i flag is used, the files are found; however, another error occurs:

make
ghc -i/root/.cabal/lib/category-extras-0.53.5/ghc-6.8.2 -c catamorphism.example.hs

catamorphism.example.hs:19:0:
    Bad interface file: /root/.cabal/lib/category-extras-0.53.5/ghc-6.8.2/Control/Functor/Fix.hi
        Something is amiss; requested module  main:Control.Functor.Fix differs from name found in the interface file category-extras-0.53.5:Control.Functor.Fix
make: *** [all] Error 1

[duncan]

So what you're doing is a per-user install as root. Either run cabal install catagory-extras as your ordinary user account or if you really want to do a global install then do:

sudo cabal install catagory-extras --global 

or

cabal install catagory-extras --global --root-cmd=sudo

The latter will do just the install part as root.

Perhaps this is suprising and we should try and detect if we are root and if so then do a global install by default. Unfortunately detecting if we are running as root is not simple and not portable (and just because we are uid=0 does not mean we have permissions under modern unix security mechanims and likewise we can have permissions to do global installs without being a root user).

[elga]

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[edouard]

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