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A general description is here.
The flag ‘-fno-optimize-sibling-calls’ is no longer forced for ‘gfortran’ 7 and later. It sbould no longer be needed now ‘USE_FC_LEN_T’ is the default. (Unless perhaps packages call Fortran code from C/C++ without using R's headers and without allowing for ‘hidden’ character-length arguments.)
‘toeplitz()’ is now generalized for asymmetric cases, also with ‘toeplitz2()’ variant.
‘library()’ now passes its ‘lib.loc’ argument when requiring ‘Depends’ packages; reported (with fix) in PR#18331 by Mikael Jagan.
‘library()’ now passes its ‘lib.loc’ argument when requiring ‘Depends’
packages; reported (with fix) in PR#18331 by Mikael Jagan.