I have made a Powershell script that sets up a GHC build environment on Windows from scratch. It's at https://github.com/melted/getghc. It largely follows the instructions at https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Windows/MSYS2. It has no dependencies aside from Powershell 3.0.

The reason I made it was to make it easier to set up a build bot on a clean machine. But it's probably generally useful for people who want to develop GHC on Windows.

Usage:

- Put the script in an empty directory

- Run it

- Hope for the best

Potential problems:

- If Python 2.7 is already installed and not on the path, the script wont install it, and msys wont pick up the path. Solution: Add the path to python in the control panel.

- Powershell wont run unsigned scripts by default. The error message will give a hint how to disable that. I will add a signed version as soon as I can figure out how.

Niklas