[Rd] Updated Windows toolchain

Dan Tenenbaum dtenenba at fhcrc.org
Wed Jan 18 01:09:29 CET 2012


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") 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

> (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".


> 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
> ______________________________________________
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