[Rcpp-devel] Rcpp_precious_remove again (Windows)

[Dominick Samperi]

The problems I have reported have three possible causes, individually, or
in combination. Feedback from experts on this might help.

1. Changes to R internals esp. since R 4.2.0 may break RInline,
     and also break other FFI apps that I'm working on (Haskell). For
     example, fetching the address of the SEXP R_NilValue gives an
     invalid address with R 4.2.2, but does not have this problem
     with R 4.1.3, for example.

2. When you start a Windows CMD terminal, at least two threads
    are started (can be seen in task manager), and sometimes Windows
    seems to start two instances of your app instead of one. This may
    be a bug in RInside, or a bug in Windows? Google shows that
    others have reported problems caused by Windows starting two
    terminals when you expect one.

3. There may be problems with the Rinline::repl() code that I have
     not found yet.

Dominick




On Mon, Jan 23, 2023 at 1:43 PM Dirk Eddelbuettel <edd at debian.org> wrote:

>
> Maintainer of affected package here:
>
> On 23 January 2023 at 12:20, Dominick Samperi wrote:
> | On the changes for R 4.2.0, it is not clear how to distinguish
> | R API functions from R internal functions (and this probably
> | doesn't matter for Rcpp), but you are correct,
> | on closer inspection these changes should not have effected
> | the way R_DefParams() was used before R_DefParamsEx()
> | was introduced.
> |
> | It would be helpful if others could test to see if they can reproduce
> | the problems I reported. I will submit a pull request when
> | ready,
>
> That would be really appreciated! It really sounds like we could do with an
> update of some internals, and as seem to have spent some time in that
> corner
> you are likely right now the most qualified person to do this.
>
> | and if there is no objection, ifdefs will be included that
> | permit compiling Rcpp and RInside using MSVC (there are only
> | a few small changes with most of them applying to RInside.cpp).
>
> I think that is out of scope, and should be not in the pull request, and
> RInside repo.
>
> By all means keep them in a branch / fork of yours if that is how you work,
> but the RInside package is part of R ecosystem which has a well-established
> empty intersection with the MSVC world and toolchains.
>
> Dirk
>
> --
> dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org
>
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