GHC_PACKAGE_PATH and $topdir bug

In ghc-pkg $topdir is replaced according to path to package that is considered global - the last on in GHC_PACKAGE_PATH (if it doesn't contain trailing ';')

Following shows how (head, 1.1.7) Cabal's haddock-command gets broken.

C:\Users\eivuokko>copy con temp.conf
[]
^Z
        1 file(s) copied.

C:\Users\eivuokko>set GHC_PACKAGE_PATH=c:\tools\ghc\ghc-6.6.1\package.conf;c:\Us
ers\eivuokko\temp.conf

C:\Users\eivuokko>ghc-pkg field base haddock-interfaces
haddock-interfaces: c:\Users\eivuokko\html\libraries\base\base.haddock

C:\Users\eivuokko>set GHC_PACKAGE_PATH=

C:\Users\eivuokko>ghc-pkg field base haddock-interfaces
haddock-interfaces: C:/tools/ghc/ghc-6.6.1\html\libraries\base\base.haddock

C:\Users\eivuokko>

Trac metadata

Trac field	Value
Version	6.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	eivuokko
Operating system	Unknown
Architecture	Unknown