From dtenenba at fhcrc.org  Wed Jan 18 01:09:29 2012
From: dtenenba at fhcrc.org (Dan Tenenbaum)
Date: Tue, 17 Jan 2012 16:09:29 -0800
Subject: [Rd] Updated Windows toolchain
In-Reply-To: <4F0AA535.4030006@stats.ox.ac.uk>
References: <alpine.LFD.2.02.1111281109480.16728@toucan.stats.ox.ac.uk>
	<4F0AA535.4030006@stats.ox.ac.uk>
Message-ID: <CAF42j23Km+B6+w7ur12s7-_8xq-GCE17wpi40SKdLWreXnTFeg@mail.gmail.com>

Hello,

On Mon, Jan 9, 2012 at 12:28 AM, Prof Brian Ripley
<ripley at stats.ox.ac.uk> wrote:
> CRAN Windows binary packages built for R-devel are now online, and Uwe's
> winbuilder has gained the ability to check source packages under R-devel.
>
> Windows check results are available from
> http://cran.r-project.org/bin/windows/contrib/checkSummaryWin.html
> and in due course from the main CRAN check page.
>
> There have been a few updates to the toolchain:
>
> (i) It is now based on a beta of gcc 4.6.3, and so reports almost the same
> compilation warnings/errors as the CRAN check machines.
>

Is the binary R-devel provided by CRAN built against this toolchain?
If it is, should I expect "R --arch x64 CMD config CC" to report
"gcc"? It still reports "x86_64-w64-mingw32-gcc" (R-devel 58077).

Also, I have the latest Rtools installed (VERSION.txt reads "Rtools
version 2.15.0.1911") and it is first on my PATH.

I expect "gcc --version" to report 4.6.3 but it still says 4.5.0.

"x86_64-w64-mingw32-gcc --version" reports 4.5.2.
"which gcc" reports "/cygdrive/c/Rtools215/MinGW/bin/gcc".

"which x86_64-w64-mingw32-gcc" reports
"/cygdrive/c/Rtools215/MinGW64/bin/x86_64-w64-mingw32-gcc".

> (ii) There are various bug-fixes to the toolchain: notably x^n and exp(x)
> use gradual underflow to denormal numbers rather than abrubtly underflowing
> to zero.
>
> (iii) This is a 'multilib' toolchain: the compiler is named 'gcc.exe' for
> both architectures, selected by flag -m32 (the default) and -m64.

Looks like to check gcc versions I should (instead of what I do above)
do simply "gcc --version". I imagine that "gcc -m32 --version" would
report the same thing as "gcc -m64 --version".

Thanks,
Dan


>
>
> On 29/11/2011 07:56, Prof Brian Ripley wrote:
>>
>> An updated toolchain is now being used for Windows' builds of R-devel:
>> details are in the R-admin manual and at
>> http://www.murdoch-sutherland.com/Rtools/ and
>> http://www.stats.ox.ac.uk/pub/Rtools/
>>
>> Both 32- and 64-bit parts of the toolchain use v2.0.1 of the Mingw-w64
>> project's runtime and a beta of gcc 4.5.4: the Mingw.org project's
>> builds are no longer used. This should mean that code which compiles for
>> 64-bit Windows also compiles for 32-bit Windows, and v.v. unless code
>> makes (incorrect but common) assumptions that pointers fit into longs.
>>
>> A very few packages will need modifications because they contain
>> declarations which clash with the headers in this toolchain: where we
>> are aware of problems the maintainers have been informed.
>>
>> At DLL level different Windows' toolchains should be compatible: at C
>> level they mostly are but at C++ level they are pretty much incompatible
>> (so that for example GDAL has to be re-compiled for every toolchain: and
>> Rcpp users need to be careful to use only one toolchain for Rcpp and
>> their packages). All the external software previously made available
>> (and more) is made available at http://www.stats.ox.ac.uk/pub/Rtools .
>>
>> The toolchain has support for OpenMP and pthreads: however OpenMP
>> support is not enabled by default in R (it is too slow to be much use).
>> If you do make use of it in your packages, be aware that you will need
>> to ship the appropriate pthreads DLL(s).
>>
>> It is expected that there will be several further minor updates prior to
>> the release of 2.15.0 in ca 4 months, but this step is the major one.
>>
>
>
> --
> Brian D. Ripley, ? ? ? ? ? ? ? ? ?ripley at stats.ox.ac.uk
> Professor of Applied Statistics, ?http://www.stats.ox.ac.uk/~ripley/
> University of Oxford, ? ? ? ? ? ? Tel: ?+44 1865 272861 (self)
> 1 South Parks Road, ? ? ? ? ? ? ? ? ? ? +44 1865 272866 (PA)
> Oxford OX1 3TG, UK ? ? ? ? ? ? ? ?Fax: ?+44 1865 272595
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel



[Rd] Updated Windows toolchain
Dan Tenenbaum