Window build broken

Simon Peyton Jones simonpj at
Wed Nov 18 08:29:37 UTC 2015

It’s msys2.  I don’t have Cygwin on this machine.  I have no idea where that prompt comes from, but I agree it’s suspicious.


From: lonetiger at [mailto:lonetiger at]
Sent: 17 November 2015 23:44
To: Simon Peyton Jones; David Macek; ghc-devs at
Subject: RE: Window build broken

Hi Simon,

I’m wondering what environment you’re coming in, is it msys2? The prompt you showed earlier

Looks like cygwin.


From: Simon Peyton Jones
Sent: Wednesday, November 18, 2015 00:25
To: David Macek;ghc-devs at
Subject: RE: Window build broken

It says this:

bash$ file libraries/ghc-prim/dist-install/build/HSghc-prim-
libraries/ghc-prim/dist-install/build/HSghc-prim- PE Unknown PE signature 0x742e x86-64 (stripped to external PDB), for MS Windows

| -----Original Message-----
| From: David Macek [mailto:david.macek.0 at]
| Sent: 17 November 2015 22:45
| To: Simon Peyton Jones <simonpj at<mailto:simonpj at>>; ghc-devs at<mailto:ghc-devs at>
| Subject: Re: Window build broken
| On 17. 11. 2015 23:31, Simon Peyton Jones wrote:
| > Sigh.  My Windows build is broken.  See below.  Any ideas?  The stage2
| complier in non-interactive mode works ok. It’s just ghci fails.  What does
| “Not x86_64 PEi386” mean?  What can I do to fix?
| Maybe it's obvious and you already checked, but could it be that the object
| file is for a different architecture? What does `file` say about it?
| --
| David Macek

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