One other thing. The instructions at

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

say to set PATH thus

export PATH=/mingw64/bin:\$PATH

But

• in the installation tree I got from msys, there IS no c:/mingw64/bin.  
• I have a root directory c:/msys64.
• Most binaries (eg bash, find) seem to be in c:/mingw64/usr/bin
• But there is also c:/msys64/mingw64/bin, which (perhaps as a result of the pacman step) has lots more stuf like ar, cc, etc.

All very confusing.  For now I have put both c:/msys64/usr/bin and c:/msys64/mingw64/bin in my path.   That seems to work, but is clearly not what the instructions say.

Thanks

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,

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".

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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