[GHC] #1612: GHC_PACKAGE_PATH and $topdir bug

[GHC]

#1612: GHC_PACKAGE_PATH and $topdir bug
-------------------------------------+-------------------------------------
        Reporter:  eivuokko          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  lowest            |               Milestone:  ⊥
       Component:  Package system    |                 Version:  6.6.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by thomie):

 * os:  Windows => Unknown/Multiple
 * milestone:  7.12.1 => ⊥


Comment:

 The bug is minor, but it's still there after 8 years. Here goes:

 In the file
 `/opt/ghc/7.10.1/lib/ghc-7.10.1/package.conf.d/base-4.8.0.0-1b689eb8d72c4d4cc88f445839c1f01a.conf`
 I make the following change:
 {{{
 -haddock-interfaces:
 /opt/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/base.haddock
 +haddock-interfaces:
 $topdir/../../share/doc/ghc/html/libraries/base-4.8.0.0/base.haddock
 }}}

 The path that ghc-pkg returns for the haddock-interfaces files exists:
 {{{
 $ ghc-pkg field base haddock-interfaces --package-
 db=/opt/ghc/7.10.1/lib/ghc-7.10.1/package.conf.d/
 haddock-interfaces:
 /opt/ghc/7.10.1/lib/ghc-7.10.1/../../share/doc/ghc/html/libraries/base-4.8.0.0/base.haddock
 }}}

 But when I do the same query while telling ghc-pkg that the global package
 database is an empty package.conf.d directory, it returns the following:
 {{{
 $ mkdir package.conf.d
 $ ghc-pkg field base haddock-interfaces --package-
 db=/opt/ghc/7.10.1/lib/ghc-7.10.1/package.conf.d/ --global-package-
 db=./package.conf.d/
 haddock-interfaces:
 /home/thomas/package.conf.d/../../share/doc/ghc/html/libraries/base-4.8.0.0/base.haddock
 }}}

 Note that that last path doesn't exist. It made the wrong substitution for
 $topdir.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1612#comment:17>
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