compiling R under cygwin
Denham Robert wrote:
For various reasons, it suits our workplace to have a cygwin version of R. I am pretty sure that cygwin is still not a supported environment for R, but we have managed to compile R-2.5.1 under cygwin without too many dramas. Our procedure is described below. We still have a few problems compiling libraries without manually changing files from .so to .dll, but it seems ok.
I would expect other subtle problems as well, because Cygwin is not a normal Unix. I don't know whether any of these differences matter to R, but some things to look out for are: - you can't unlink a file while it is open - filenames are not case sensitive - file permissions have strange defaults (everything is executable) - I think the executable format still needs to be Windows format - There's no such thing as a ptty - You'll probably need X11 for graphics, and will lose support for Windows metafile output (wmf)
I was wondering whether this information is likely to be useful to others, and if we should spend any time looking in to ways in which the configure/build/install code could be modified to allow a standard install.
What is the advantage of building this? I don't think we want to support platforms just for the sake of supporting more platforms, but if there's a real need for it, that would be different. Duncan Murdoch
Notes on building R under cygwin:
export FFLAGS=-O3
export CFLAGS=-O3
export CXXFLAGS=-O3
export OBJCFLAGS=-O3
export FCFLAGS=-O3
export LDFLAGS='-lblas -lg2c -lintl'
export R_OSTYPE=unix
./configure --prefix=/opt/freeware/R/R-2.5.1 \
--with-tcl-config=/usr/lib/tclConfig.sh \
--with-tk-config=/usr/lib/tkConfig.sh \
--with-blas=-lblas \
--with-lapack=-llapack \
--enable-R-shlib
comment out Win32 in src/include/config.h and set Unix to 1, change .so
to .dll. change .so to .dll and in Makeconf.
in src/extra/xdr/rpc/types.h comment out defn of malloc.
Change .so to .dll in Makefile's
edit Makeconf and set R_OSTYPE to unix
make -j2
when blas doesn't link, re-run command with -lblas -lg2c on end and
change output to .dll
edit Rstrptime.c and change wcstod to atof.
in modules:
when X11 and internet falls over add -lintl to link line. add -lg2c and
-lblas to lapack
comment out library/base/R/library.R lines 47-51 to avoid arch check
which seems to go wrong!
make -j2
make install
edit /opt/freeware/R/R-2.5.1/lib/R/etc/Makeconf and add '-lintl -lg2c
-lblas' to the end of ALL_LIBS
so the module building works. Change .so to .dll also
(can't see how to to this for the build tho...)
Our cygwin info is:
sysname release version
"CYGWIN_NT-5.1" "1.5.20s(0.155/4/2)" "20060527 19:21:22"
Robert Denham
Environmental Statistician
Remote Sensing Centre
Telephone 07 3896 9899
www.nrw.qld.gov.au <http://www.nrw.qld.gov.au/>
Department of Natural Resources & Water
QScape Building, 80 Meiers Road, Indooroopilly Qld 4068
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