On Tue, 23 Dec 2008, Thomas Baier wrote:
Simon Urbanek wrote:
FWIW: technically, you don't have to match the patch level version.
Although default DLL checks usually require perfect match, it should
be safe to require that R version lies in [x.y.z, x.y+1.0) where
x.y.z is the R version that the interfacing DLL was compiled against.
(And hence it is safe to use R x.y.0 as the base for compilation until
R x.y+1.0 is released).
The check that has been implemented works as:
snprintf(Rversion, 25, "%s.%s", R_MAJOR, R_MINOR);
if(strncmp(getDLLVersion(), Rversion, 25) != 0) {
... check failed
}
... check ok
Quoting from http://cran.r-project.org/doc/manuals/R-exts.html
int main (int argc, char **argv)
{
structRstart rp;
Rstart Rp = &rp;
char Rversion[25], *RHome;
sprintf(Rversion, "%s.%s", R_MAJOR, R_MINOR);
if(strcmp(getDLLVersion(), Rversion) != 0) {
fprintf(stderr, "Error: R.DLL version does not match\n");
exit(1);
}
...
this looks very similar. According to your message, full binary
compatibility is given for same R (major.minor) versions, e.g. 2.8.0 is
fully compatible with 2.8.1, but may not be fully compatible with 2.9.0.
Is there a "compatible DLL version" that can be queried or is using
getDLLVersion() the recommended approach and ignoring everything after the
second '.'?
The latter. It is expected that the C-level API is compatible
throughout 2.8.x, but people do use non-API entry points, hence the more
rigid check in this example.
And if 2.8.0 and 2.8.1 are fully compatible, why is a warning issued, if a
package built with R 2.8.1 is loaded in R 2.8.0?
They may not be compatible at R function level: new features are allowed,
as well as bug fixes which code may rely on.
--
Brian D. Ripley, rip...@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 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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