Hi,

Pardon me if this is off-topic but it looks from recent discussion like several 
people here are working on helping Duncan with the new toolchain and I thought 
some reports about issues with it might be welcome/helpful. If not, please 
ignore this email or suggest a more appropriate place for it (since Duncan is 
traveling, I thought R-devel might be a less appropriate place).

Bioconductor has been running with the new toolchain for a few days. The main 
issues seem to be:

- If a package links against another C/C++ library, that library needs to be 
rebuilt from source using the compilers in the new Rtools. This can be fairly 
painful for some windows libraries. In one case (protobuf) the appropriate 
version of ranlib was not run against the 64-bit static library; I ended up 
doing this by hand.

- A package (Rgraphviz) failed because of a line in Makevars.win:
gcc.exe: error: unrecognized command line option '-WI,--enable-auto-import'
removing the line:
PKG_LIBS += -WI,--enable-auto-import 
fixed the problem

There are several other packages that have problems related to the new 
toolchain, but I haven't figured out exactly what they are yet. Our build 
report (http://bioconductor.org/checkResults/devel/bioc-LATEST/) has more 
information. Here are the specific packages (the report contains a reference to 
their source in svn; you can check them out with the username readonly and 
password readonly):

http://bioconductor.org/checkResults/devel/bioc-LATEST/affxparser/moscato2-install.html
http://bioconductor.org/checkResults/devel/bioc-LATEST/AffyTiling/moscato2-buildsrc.html
http://bioconductor.org/checkResults/devel/bioc-LATEST/DNAcopy/moscato2-install.html
http://bioconductor.org/checkResults/devel/bioc-LATEST/GeneSelectMMD/moscato2-buildsrc.html
http://bioconductor.org/checkResults/devel/bioc-LATEST/Rdisop/moscato2-install.html


Let me know if you have any questions about this.

Thanks,
Dan

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