RKWard and R 4.0.0 - Important bug and workaround

[Thomas Friedrichsmeier]

Hi!

A quick note, in particular to packagers: Source for RKWard 0.7.1b are
now available at https://files.kde.org/rkward/testing/for_packaging/ .

This bugfix release has a workaround for the important issue discussed,
previously (see cited mail, below). It also comes with two further
fixes for one crash and one hang, cherry-picked from the development
version.

If your distribution ships R 4.0.0, or will ship R 4.0.0 (instead of
waiting for R 4.0.1), I would like to ask you to package this as soon
as possible. Should you prefer to patch existing RKWard 0.7.0 packages,
the most important patch to apply is this:
https://invent.kde.org/education/rkward/-/commit/f1e12da76b7ea4dbcb99c8a38ce9dbb5cb96e1a6

An announcement on https://rkward.kde.org will hopefully follow,
tomorrow, if I can find the time, and if our Windows and Mac builds
proceed as planned.

Thanks!
Thomas

Am Sun, 24 May 2020 10:14:17 +0200
schrieb Thomas Friedrichsmeier
<thomas.friedrichsmeier at ruhr-uni-bochum.de>:
> Hi!
> 
> This is a note of caution about using RKWard with R 4.0.0:
> 
> -- Problem --
> 
> There is a bug in R 4.0.0 with respect to active bindings, which
> RKWard is relatively likely to trigger. Running the following code
> *twice* will render your RKWard session unusable, and **could result
> in loss of data**:
> 
>   for (i in 1:2) { print (i) }
> 
> Note that this affects top-level statements, only, i.e. in general
> code that you enter in the console of run from a script, directly.
> Not code in packages or RKWard plugins.
> 
> -- Workaround --
> 
> If you have the choice, please delay upgrading R until R 4.0.1 is
> released.
> 
> If you have already installed R 4.0.0, you should set the option
> 
>   compiler::enableJIT(2)  # or a lower value
> 
> in each session. This can also be made permanent by copying it into
> the field "Futher option commands to run in each session" in
> Settings->Configure RKWard->R-Backend.
> 
> -- Outlook --
> 
> The bug has been fixed in R devel, but no release date has been set to
> R 4.0.1, yet. I will probably create a "bugfix"-release that enables
> the above workaround by default in the coming day. Meanwhile I have
> started working on a new approach to object modification detection
> that does not rely on active bindings.
> 
> Regards
> Thomas

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