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Recently, CRAN checks for reticulate started failing on macOS-oldrel.
After some investigation, it appears that the macOS-oldrel runners—and only the macOS-oldrel runners—set the environment variable
_R_CHECK_VIGNETTES_SKIP_RUN_MAYBE_=false
when running checks.My understanding is that this results in the vignettes being processed with
knitr::purl()
, which converts them into a script. The script is then evaluated as part of the checks. In the context where the script is evaluated,knitr
calls likeknitr::opts_chunk$set(eval = FALSE)
do not function, and chunks that are not meant to be evaluated in vignettes still get evaluated, leading to errors, and CRAN check failures.This is affecting downstream packages and is also the reason why CRAN machines have not built a binary for the latest release of reticulate.
This issue is also impacting other packages:
RcppCore/RcppArmadillo#447
yihui/knitr#2338