[Rd] [External] Re: Operations with long altrep vectors cause segfaults on Windows

[Jeroen Ooms]

On Tue, Sep 8, 2020 at 5:20 PM Tomas Kalibera <tomas.kalibera using gmail.com> wrote:
>
> On 9/8/20 4:48 PM, Hugh Parsonage wrote:
> > Unfortunately I only get
> >
> > [Thread 21752.0x4aa8 exited with code 3221225477]
> > [Thread 21752.0x4514 exited with code 3221225477]
> > [Thread 21752.0x3f10 exited with code 3221225477]
> > [Inferior 1 (process 21752) exited with code 030000000005]
> >
> > (I'm guessing I would need to build an instrumented version of R, or
> > can R be debugged using gdb with an off-the-shelf installation?)
>
> No, the default build lacks debug symbols. You need a build with debug
> symbols, and if you can reproduce in a build without compiler
> optimizations (-O0), the backtrace may be easier to interpret. Some bugs
> however "disappear" when optimizations are disabled. You can build R
> from source (and there may be debug builds provided by someone else
> (Jeroen?)).

Debug builds for each revision are available from
https://r-devel.github.io . To download the installer you need to
click the github icon in the last column in the table. You need to be
signed in with a (free) Github account in order to download builds
(artifacts) from Github actions. It will show download links for both
the regular installer and installer with debug symbols.

In other news, the https://r-devel.github.io table also shows that the
fix that martin committed is segfaulting on 32-bit.