[R-pkg-devel] REAL(16) fails on M1 Macs

[Rampal Etienne]

Hello,

I have a package with FORTRAN code using REAL(16) for accurate 
computations. This package has been on CRAN for several years, but now 
it suddenly fails on M1 Macs, apparently due to the use of REAL(16) - it 
cannot handle higher precision than DOUBLE PRECISION, i.e. REAL(8). How 
do I solve this problem? Is it possible to exclude a certain 
architecture/platform (that of M1 in this case)?

Kind regards,

Rampal Etienne