[Rd] Change of compiler for Windows build of R

[Henrik Bengtsson]

Thanks to both of you! /Henrik

On 8/15/07, Duncan Murdoch <murdoch at stats.uwo.ca> wrote:
> On 8/14/2007 2:52 AM, Prof Brian Ripley wrote:
> > The MinGW people have finally released a couple of builds of gcc 4.2.1
> > (and finally moved the build of 3.4.5 to release status after 19 months as
> > 'candidate').
> >
> > We intend to use gcc 4.2.1 for the binary distribution of R 2.6.0, and
> > builds of R-devel are being made with it from now on.  The R-admin manual
> > now contains details of the pieces you need, and in due course there will
> > be an updated Rtools.exe containing this version.  I've successfully built
> > cross-compilers although am unlikely to distribute one for a while.
>
> Rtools.exe has now been updated on www.murdoch-sutherland.com/Rtools.
> Please let me know of any problems.
>
> It currently includes both gcc 4.2.1 and 3.4.5; I expect to drop 3.4.5
> sometime after the release of R 2.6.0.  It also includes Vanilla Perl,
> so finally Rtools.exe is all you need to build packages on Windows.
> (You probably want to get the Microsoft help compiler and some LaTeX,
> but these are not strictly necessary.)
>
> Duncan Murdoch
>
> >
> > gcc 4.2.1 is a better check of standards conformance, and you may see
> > warnings in packages not present with gcc 3.4.5.  All the CRAN packages
> > have been checked, and this showed up some issues with packages which
> > deviated markedly from the documented procedures. E.g.
> >
> > - the C++ compiler is $(CXX), not g++, and $(CXX) is defined in MkRules.
> >
> > - there is a quirk with dlltool both on Vista and with gcc 4.2.1 on XP
> >    that needs '--as' included amongst the flags.  The rule in MkRules
> >    works: several user-written rules do not.
> >
> > So far we have seen no issues with mixing code compiled with gcc 3.4.5 and
> > 4.2.1.  There would almost certainly be issues with third-party C++
> > libraries, and might be some with Fortran libraries that use complex
> > numbers.
> >
> > The advantages of using this port include:
> >
> > - Vista compatibility out of the box.
> >
> > - ongoing support.  The main MinGW developer is really targetting gcc
> >    4.3.0, and these compilers are interim releases with patches backported
> >    from the gcc trunk.
> >
> > - More complete C99 features: for example C99 inlining will be supported
> >    in gcc 4.3.0 (and has already been tested using snapshots).
> >
> > - integrated F9x support.  F9x is supported 'out of the box', and can now
> >    consider using F9x code in R.
> >
> > - OMP and threading support.
> >
> >
> > R 2.5.1 will not build out of the box with these compilers, but R-patched
> > will (for suitable settings in MkRules).
> >
>
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