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A general description is here.
It is now possible to set ‘timeouts’ (elapsed-time limits) for most parts of ‘R CMD check’ _via_ environment variables documented in the ‘R Internals’ manual. [This depends on the experimental ‘timeout’ feature of ‘system2()’ and hence subject to change, as are the names of the environment variables.]
‘system()’ and ‘system2()’ now allow the specification of a maximum elapsed time (‘timeout’). (This feature is currently experimental and subject to change.)
‘R CMD check’ checks for and ‘R CMD build’ corrects CRLF line endings in shell scripts ‘configure’ and ‘cleanup’ (even on Windows).
‘R CMD check’ checks for and ‘R CMD build’ corrects CRLF line endings
in shell scripts ‘configure’ and ‘cleanup’ (even on Windows).
It is again possible to use ‘configure --enable-maintainer-mode’ without having installed ‘notangle’ (it was required in R 3.4.[01]).