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A general description is here.
‘USE_FC_LEN_T’ is the default: this uses the correct (compiler-dependent) prototypes for Fortran BLAS/LAPACK routines called from C/C++, and requires adjustment of many such calls - see ‘Writing R Extensions’ §6.6.1.
## g++ 11 supported c++23. ## 2022-09 Recent LLVM (>= 13?) and Apple (>= 13?) clang support c++2b.
There is initial support for C++23 as several compilers are now supporting ‘-std=c++23’ or ‘-std=c++2b’ or similar. As for C++20, there no additional ‘configure’ checks for C++23 features beyond a check that the compoiler reports a ‘__cplusplus’ value greater than that in the C++20 standard.
The LaTeX style for producing the PDF manuals, ‘Rd.sty’, now loads the standard ‘amsmath’, ‘amsfonts’ and ‘amssymb’ packages for greater coverage of math commands in the Rd \eqn and \deqn macros. The \mathscr LaTeX command is also provided (via the ‘mathrsfs’ package, if available, or the ‘amsfonts’ bundle otherwise), fulfilling the wish of PR#18398.