I'm using HaskellPlatform-2012.4.0.0 on Win7. It's installed as portable. Paths are managed through .bat file so ghci and ghc works. Cabal config and folder are made semi-portable with this.
The problem is ghc
folder. It installs itself in C:\\Users\\name\\AppData\\Roaming\\ghc\\i386-mingw32-7.4.1.
How to change it's default path? So I can have really portable Haskell on windows :)
EDIT: There are 3 new system variables that do nothing. Here are results:
SET APPDATA=%~dp0AppData -- has no effect. ghc is still made in roaming
SET USERPROFILE=%~dp0 -- kills cabal
SET LOCALAPPDATA=%~dp0Local --not sure if this is ever used.
You could try SET USERPROFILE=%~dp0
while making sure that the folder structure supports what Cabal expects. It is probably attempting to go to %USERPROFILE%AppData\\Roaming
or something similar.
You can use symbolic links mklink /D linkName target
/D means directory symlink. This command available since Windows Vista/2008+
cd C:\Users\myself\AppData\Roaming
mklink /D cabal C:\installed\cabal
mklink /D ghc C:\installed\ghc
More info on symlinks http://en.wikipedia.org/wiki/NTFS_symbolic_link
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