“C:\msys64\msys2_shell.cmd -mingw64 -mintty”

Won’t work for you as it spawns a new process using mintty as your terminal emulator.

If I remember correctly you have a setup where you use bash directly in emacs. In which case you just need

To set the environment variables and add /mingw64/bin to your path.

I would personally avoid the use of mintty because of how it implements pty. Lots of interactive programs don’t work

Correctly under it, including ghci where we need specific hacks to work around some of it’s issues https://github.com/mintty/mintty/issues/56.

From: Simon Peyton Jones via ghc-devs
Sent: Monday, March 26, 2018 11:03
To: Shao, Cheng; ghc-devs@haskell.org
Subject: RE: Windows

If the build environment is managed by an MSYS2 installation, then the MinGW64 shell startup script automatically sets up "MSYSTEM" for you. It can be launched like "C:\msys64\msys2_shell.cmd -mingw64 -mintty".

Well I just followed the Method A instructions at

https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Windows

Are you saying that I should run “C:\msys64\msys2_shell.cmd -mingw64 -mintty" just once, after installing? Or repeatedly? Or that I should somehow us it as my main shell? And what does that commend actually do?

Sorry to be dense

Simon

From: ghc-devs <ghc-devs-bounces@haskell.org> On Behalf Of Shao, Cheng
Sent: 26 March 2018 10:59
To: ghc-devs@haskell.org
Subject: Re: Windows

Hi Simon,

On Mon, Mar 26, 2018 at 5:46 PM, Simon Peyton Jones via ghc-devs <ghc-devs@haskell.org> wrote:

Making it part of the error message would be v helpful.

I have added a section to "Troubleshooting" on
https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Windows

But it should really be part of the instructions higher up to sa
export MSYSTEM=MINGW64

Might someone do that? I wasn't quite sure where

Simon

| -----Original Message-----
| From: ghc-devs <ghc-devs-bounces@haskell.org> On Behalf Of Ben Gamari
| Sent: 24 March 2018 16:42
| To: Gabor Greif <ggreif@gmail.com>; lonetiger@gmail.com
| Cc: ghc-devs@haskell.org
| Subject: Re: Windows
|
| Gabor Greif <ggreif@gmail.com> writes:
|
| > Just an idea...
| >
| > could this hint be part of the `configure` error message?
| >
| Indeed. See D4526.
|
| Cheers,
|
| - Ben
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