[Rd] switch to reference counting in R-devel
|uke-t|erney @end|ng |rom u|ow@@edu
Tue Dec 3 17:04:00 CET 2019
R-devel has been switched to use reference counting by default with
r77508. Building with -DSWITCH_TO_NAMED goes back to the NAMED
On Sun, 24 Nov 2019, luke-tierney using uiowa.edu wrote:
> Baring any unforeseen issues R-devel will switch in about a week from
> the NAMED mechanism to reference counting for determining when objects
> can be safely mutated in base C code. This is expected to have minimal
> impact on packages not using unsupported coding practices in their C
> The transition to reference counting has been in progress for a
> number of years. Some older notes on this are available at
> http://developer.r-project.org/Refcnt.html. These may no longer be
> completely accurate but should give you an idea of what is going on.
> If you want to test your package under reference counting you can do
> so by building R with -DSWITCH_TO_REFCNT added to CFLAGS or DEFS in a
> config.site file.
> A small number of packages are still using the NAMED or SET_NAMED
> functions even though this has been discouraged for some time.
> For now these will not produce errors but also not do anything useful.
> They will probably be removed before R 4.0.0 is released, so you
> should look at why you are using them and adjust accordingly.
Ralph E. Wareham Professor of Mathematical Sciences
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