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A general description is here.
There is a new variant option ‘--enable-lto=check’ for checking consistency of BLAS/LAPACK calls - see ‘Writing R Extensions’.
User-set ‘DEFS’ (e.g., in ‘config.site’) is now used for compiling packages (including base packages).
‘available.packages()’ and hence ‘install.packages()’ now pass their ‘...’ argument to ‘download.file()’, fulfilling the wish of PR#17532.
[On Windows only], ‘writeClipboard(.., format = <n>)’ now does correctly pass ‘format’ to the underlying C code, thanks to a bug report (with patch) by Jenny Bryan.