On Mon, 30 Aug 2010, Adrian Waddell wrote:
Dear R Community,
I adapted the C-Code found at (http://wiki.tcl.tk/25685) implementing
fast image resizing for Tk images for my R package.
The C Code differs for tcl/tk version 8.4 and 8.5. I have the working
code for both versions.
How do I integrate this C-Code into my package so that R CMD INSTALL
takes care of compiling the function correct for each OS and tcl
version? (such that I can submit the package to CRAN).
Once the two files would be compiled I could load the correct function
You can't do that: very few systems will have both Tcl 8.4 and 8.5
libraries installed. So you need to use the package's configure
script to detect the Tcl/Tk version and also what libraries to compile
against.
I'm not sure I would try to support Tcl 8.4: 8.5 has been out for a
long time now and you could simply make it a package
SystemRequirement. We are only support 8.4 in R because we have
existing code to do so that has not yet been removed.
by checking with
library(tcltk)
.Tcl('set tcl_version')
which tcl version R connects to?
For example the gcc command I call under Ubuntu is:
gcc -shared -o imgscale.so -DUSE_TCL_STUBS -I/usr/include/tcl8.5/
imagescale_85.c -L/usr/lib/ -ltclstub8.5 -fPIC
and
gcc -shared -o imgscale.so -DUSE_TCL_STUBS -I/usr/include/tcl8.4/
imagescale_84.c -L/usr/lib/ -ltclstub8.4 -fPIC
Thanks,
Adrian Waddell
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Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
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