[Rd] Detect UCRT-built R from within R sessions (and in configure.win)

[Hiroaki Yutani]

Thanks for both, I'll try these features.

2021年9月14日(火) 22:40 Tomas Kalibera <tomas.kalibera using gmail.com>:

>
>
> 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.
>
> Best
> Tomas
>
>
> Best,
> Hiroaki Yutani
>
> 2021年9月9日(木) 0:48 Tomas Kalibera <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 always
>> > reliable.
>>
>> There in not such a mechanism, yet, but can be added, at least for
>> diagnostics.
>>
>> 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
>> Tomas
>>
>> >
>> > Best,
>> > Hiroaki Yutani
>> >
>> > ______________________________________________
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