[GHC] #13709: Drop GCC Driver

[GHC]

#13709: Drop GCC Driver
---------------------------------+----------------------------------------
        Reporter:  Phyx-         |                Owner:  Phyx-
            Type:  task          |               Status:  patch
        Priority:  normal        |            Milestone:  8.4.1
       Component:  Compiler      |              Version:  8.0.1
      Resolution:                |             Keywords:
Operating System:  Windows       |         Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):  Phab:D3592
       Wiki Page:                |
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Comment (by Tamar Christina <tamar@…>):

 In [changeset:"d6cecde585b0980ed8e0050c5a1d315789fb6356/ghc"
 d6cecde5/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="d6cecde585b0980ed8e0050c5a1d315789fb6356"
 Remove the Windows GCC driver.

 Summary:
 This patch drops the GCC driver and instead moves
 the only remaining path that we need to keep for
 backwards compatibility to the settings file.

 It also generalizes the code that expands `$TopDir`
 so it can expand it within any location in the string
 and also changes it so `$TopDir` is expanded only
 after the words call because `$TopDir` can contains
 spaces which would be horribly broken.

 Test Plan: ./validate

 Reviewers: austin, hvr, bgamari

 Reviewed By: bgamari

 Subscribers: rwbarton, thomie, erikd

 GHC Trac Issues: #13709

 Differential Revision: https://phabricator.haskell.org/D3592
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13709#comment:3>
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