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

Ray Donnelly rdonnelly at continuum.io
Mon Apr 4 21:13:38 CEST 2016

On Mon, Apr 4, 2016 at 7:39 PM, Jeroen Ooms <jeroen.ooms at stat.ucla.edu>

> 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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