From rdonnelly at continuum.io  Mon Apr  4 21:13:38 2016
From: rdonnelly at continuum.io (Ray Donnelly)
Date: Mon, 4 Apr 2016 20:13:38 +0100
Subject: [Rd] Optimization bug when byte compiling with gcc 5.3.0 on
	windows
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	<CABFfbXv4MC=Q-Crt-9Z4t-TooKqRzLSikBvxsg4fJ695zKKAug@mail.gmail.com>
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On Mon, Apr 4, 2016 at 7:39 PM, Jeroen Ooms <jeroen.ooms at stat.ucla.edu>
wrote:

> On Sun, Apr 3, 2016 at 6:44 PM, Ray Donnelly <rdonnelly at continuum.io>
> wrote:
> > I've started to look into building R for Windows using MSYS2 as both the
> > build environment and tools + libraries provider (where possible).
>
> Thanks for your reply, and for the patches.
>

No problem.


> Last time I had a look at this (a few months ago) another problem was
> that mingw-w64 v4 was giving different numeric output for some of the
> tests in r-base. If I recall correctly, some eigen vectors had their
> direction flipped (negative values became positive and vice versa).
> Did you notice anything of this kind when running 'make check' and
> 'make check recommended' ? It is important to us that numeric results
> are reproducible between versions of R.
>

I have not seen make check fail with any reports of eigenvector flip.

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[Rd] Optimization bug when byte compiling with gcc 5.3.0 on windows
Ray Donnelly