Thanks to all that looked at it and tried to answer.
I am reporting here what I found in the end, in the hope it helps someone
with a similar issue solve it quicker than I solved the one I had:
Having
int R_NaInt;
rather than
extern int R_NaInt;
in the header / C definitions of the cffi interface (part of the header
definitions have to be copied/prepared to be digestable by the C parser
used Python's cffi interface) was enough to send R into a confused state at
initialization (but without an obvious error message).
Le lun. 16 sept. 2019 à 03:55, Martin Maechler <maech...@stat.math.ethz.ch>
a écrit :
> >>>>> Laurent Gautier
> >>>>> on Sun, 15 Sep 2019 15:01:09 -0400 writes:
>
> > In case a search engine leads someone with the same issue
> > here, I am documenting the point I reached:
>
> > I can reproduce the issue with a small example when
> > forcing R to not load any package at startup time (using
> > an Renviron file): ``` package <- "utils" lib.loc <-
> > "<fill this according to your R install>" ns <-
> > loadNamespace(package, lib.loc) ```
>
> > The code path goes through
> > `registerS3methods(nsInfo$S3methods, package, env)` and
> > there to:
>
> > ``` if (methods::is(genfun, "genericFunction")) ```
>
> > The evaluation of `methods::is` reaches the line
> > triggering the error as `.identC(class1, class2)` and
> > `.identC(class2, "ANY")` both return `NA` and `NA || NA`
> > is not defined:
>
> > ```
> >> if (NA || NA) { cat("here\n") }
> > Error in if (NA || NA) { : missing value where TRUE/FALSE
> > needed ```
>
> > As I understand it `.identC()` should never return `NA`,
>
> that understanding is correct, it should return TRUE or FALSE,
> nothing else.
>
> > and if the case this would mean that R itself is an
> > unstable state (something at the C level that should not
> > have happened has happened) but this was not caught
> > earlier.
>
> yes.. something like that...
> My current diagnosis would be that something in your embedding of R
> happened
> in a way that "broke R entirely" ...
> but note that I know almost nothing about embedding R.
>
> Martin
>
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