[GHC] #9184: Allow the use of Python 3 when building GHC

[GHC]

#9184: Allow the use of Python 3 when building GHC
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        Reporter:  aspidites   |            Owner:
            Type:  feature     |           Status:  new
  request                      |        Milestone:
        Priority:  normal      |          Version:  7.8.2
       Component:  Build       |         Keywords:  python
  System                       |     Architecture:  Unknown/Multiple
      Resolution:              |       Difficulty:  Easy (less than 1 hour)
Operating System:              |       Blocked By:
  Unknown/Multiple             |  Related Tickets:
 Type of failure:              |
  None/Unknown                 |
       Test Case:              |
        Blocking:              |
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Description changed by aspidites:

Old description:

> According to the
> [https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Windows
> wiki], it is preferred that a user have Python 2.7 installed before
> attempting to build GHC. As I'm on Arch Linux the default Python version
> is 3.4. As such, rather than simply changing the shebang line to
> explicitly ask for version 2, I made it so that the scripts all use
> syntax that works properly for versions 2.7 to 3.4. I don't think I've
> used anything that disallows 2.6, but don't have that version available
> to check against.

New description:

 According to the
 [https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Windows wiki],
 it is preferred that a user have Python 2.7 installed before attempting to
 build GHC. As I'm on Arch Linux the default Python version is 3.4. As
 such, rather than simply changing the shebang line to explicitly ask for
 version 2, I made it so that the scripts all use syntax that works
 properly for versions 2.7 to 3.4. I don't think I've used anything that
 disallows 2.6, but don't have that version available to check against.

 I should note that the changes were as minimal as possible. That is, I
 didn't bother refactoring to use more modern idioms (such as string
 substitution vs concatenation). As these are helper scripts, I doubt doing
 so would be much help, but I wouldn't mind doing so upon request.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9184#comment:1>
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