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A general description is here.
New macro ‘F_VISIBILITY’ as an alternative to ‘F77_VISIBILITY’. This will become the preferred form in R 3.6.0.
‘R CMD check’ now checks line endings of files with extension ‘.hpp’ and those under ‘inst/include’. The check now includes that the file is terminated by a newline.
‘R CMD build’ will correct line endings in the newly-checked files.