Windows failures

Simon Peyton-Jones simonpj at
Wed Jun 19 14:06:25 CEST 2013

Curiously you are right.  Target is 
,("Target platform","i386-unknown-mingw32")

Weird since it's a 64-bit machine.


-----Original Message-----
From: Ian Lynagh [mailto:ian at] 
Sent: 18 June 2013 23:06
To: Simon Peyton-Jones
Cc: ghc-devs at
Subject: Re: Windows failures

On Mon, Jun 17, 2013 at 08:48:15PM +0000, Simon Peyton-Jones wrote:
> This is 'sh validate" on 64bit Windows.  Rather a lot of failures.  Might you look?


> The perf tests seem to fail because it's comparing with the *32* bit numbers, even though this is definitely a *64* bit laptop.   Whether the entire build system thinks it's a 32 bit machine, or just the testsuite, I can't tell.

If you have a 64bit Windows machine, then you'll be able to run both the 32bit and 64bit GHC builds. If you run "ghc --info | grep Target" then you'll see which is being used - it'll say x86_64-unknown-mingw32 if it's 64bit, and i386-unknown-mingw32 if it's 32bit. I suspect that you have a 32bit GHC, so comparing with the 32bit numbers is right. They probably just need updating for recent wobbles.

Ian Lynagh, Haskell Consultant
Well-Typed LLP,

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