This blog is updated daily.
A general description is here.
Specifying C++11 or C++14 has long given a note: in 99% of CRAN packages the specification is unnecessary as the default C++17 suffices (in a few cases with a deprecation warning from some compilers).
The intention is that support for those standards will be withdrawn before release.
‘R CMD config’ will no longer support ‘CXX11’, ‘CXX14’ nor their associated ‘FLAGS’, ‘STD’ and ‘LDFLAGS’ values.
Some legal but strange nested complex assignments are handled a bit more robustly in interpreted code.
‘chol(x, pivot=TRUE)’ now zeroes the trailing submatrix when the algorithm stops early. Following the help page instructions on how to reconstruct the matrix in positive semidefinite cases gave incorrect results if the rank was 2 or more less than the dimension. (PR#15853).