[Rd] Detect UCRT-built R from within R sessions (and in configure.win)
tom@@@k@||ber@ @end|ng |rom gm@||@com
Tue Sep 14 15:40:39 CEST 2021
On 9/9/21 5:54 AM, Hiroaki Yutani wrote:
> Thank you for the prompt reply.
> > There in not such a mechanism, yet, but can be added, at least for
> > diagnostics.
> For example, can R.version somehow contain the information?
Yes, now added to the experimental builds. R.version$crt contains "ucrt"
(and would contain "msvcrt" if R was built against MSVCRT).
> > We could add support for configure.ucrt, which would take precedence
> > over configure.win on the UCRT builds (like Makevars.ucrt takes
> > precedence over Makevars.win). Would that work for you?
> Yes, configure.ucrt should work for me. There might be someone who
> prefers to switch by some envvar rather than creating another file,
> but I don't have a strong opinion here.
The experimental builds now support configure.ucrt and cleanup.ucrt files.
> Hiroaki Yutani
> 2021年9月9日(木) 0:48 Tomas Kalibera <tomas.kalibera using gmail.com
> <mailto:tomas.kalibera using gmail.com>>:
> On 9/8/21 2:08 PM, Hiroaki Yutani wrote:
> > Hi,
> > Are there any proper ways to know whether the session is running on
> > the R that is built with the UCRT toolchain or not? Checking if the
> > encoding is UTF-8 might do the trick, but I'm not sure if it's
> > reliable.
> There in not such a mechanism, yet, but can be added, at least for
> You are right that checking for UTF-8 encoding would not always be
> reliable. For example, the version of Windows may be too old to
> allow R
> use UTF-8 as native encoding (e.g. Windows server 2016), then R
> will use
> the native code page as it does today in the MSVCRT builds.
> > Also, I'd like to know if there's any mechanism to detect the
> UCRT in
> > configure.win. I know there are Makevars.ucrt and Makefile.ucrt, but
> > one might want to do some feature test that is specific to the UCRT
> > toolchain.
> We could add support for configure.ucrt, which would take precedence
> over configure.win on the UCRT builds (like Makevars.ucrt takes
> precedence over Makevars.win). Would that work for you?
> > Best,
> > Hiroaki Yutani
> > ______________________________________________
> > R-devel using r-project.org <mailto:R-devel using r-project.org> mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-devel
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