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A general description is here.
‘USE_FC_LEN_T’ is the default: this uses the correct prototypes for
Fortran BLAS/LAPACK routines called from C/C++, and requires adjustment
of most such calls - see ‘Writing R Extensions’ §6.6.1.
[In progress: scheduled for May 7.
Setting environment variable ‘_R_INSTALL_USE_FC_LEN_T_’ to a true value enables this _pro tem_. This is set by ‘R CMD check --as-cran’ when it installs a package.]
‘USE_FC_LEN_T’ is the default: this uses the correct prototypes for Fortran BLAS/LAPACK routines called from C/C++, and requires adjustment of most such calls - see ‘Writing R Extensions’ §6.6.1.
‘default.stringsAsFactors()’ is defunct,
‘fisher.test(d)’ no longer segfaults for “large” ‘d’; fixing PR#18336 by preventing/detecting an integer overflow reliably.