Link with C code (compiled code under Windows)

From: "Patrick Wendel" <p.wendel at ic.ac.uk>
Date: Tue, 30 Jan 2001 13:05:23 -0000


I am using cygwin (latest version) and I managed to generate a dll partly
with rcmd shlib although there was a problem with both the resouce file (I

Rcmd SHLIB, perhaps?

had to remove "FILEOS VOS__WINDOWS32") and the command line for gcc
(--shared is not supported for instance).

As all recent cygwins have supported --shared, I don't know what to say.
Set up correctly, it works out of the box, although there are warnings
in the documentation that it is not a preferred route.

Also HAVE_SHARED is a documented flag.  You did notice that as you
edited MkRules, didn't you?

So I would like to know which compiler/environment you advise to use for
windows OS.

That is clearly documented in the sources and rw1021sp.zip, in files
INSTALL and readme.packages, for example.

Then I could load the library in R but couldn't call any method.

Is there a function to know which functions have been successfully imported
?

None. DLLs don't work like that: they are probed for symbols as needed.
You can use pedump to explore whether the symbols are exported correctly.

I've also done the dll in other ways (using gcc and dlltool as explained on
their website and also using VC++) but I had the same result.

May be it is not the DLL.  Maybe it is your C code or what you are
trying to do with it?

I suppose I missed something in the dll creation but I cannot see what.

Any idea ?

Try

(1) reading the R documentation
(2) making a simple example (e.g. package windlgs) to see if your
compiler system is working.

BDR

BTW, Rcmd SHLIB in 1.2.1 using some make.exe's fails.  Change SOURCES in
bin/SHLIB and src/gnuwin32/MakeDll to CFSOURCES to avoid this.
(Some make.exe's pass down macros, some do not ....  It worked with the
make I first used, but not the latest 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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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