https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79430
--- Comment #6 from Jürgen Reuter <juergen.reuter at desy dot de> --- (In reply to Dominique d'Humieres from comment #5) > What does --with-precision=extended? It sets the default precision of real and complex floats (kind type parameter) to 80 bit instead of 64 bit (double) or 128bit (quadruple) precision according to: !!! available REAL kinds ! prec. ! ISO ! C integer, parameter :: single = 4 ! 1.. 6 ! real32 ! c_float integer, parameter :: double = 8 ! 7..15 ! real64 ! c_double integer, parameter :: extended = 10 ! 16..18 ! real128 ! c_long_double integer, parameter :: quadruple = 16 ! 19..33 ! -1 ! c_float128 integer, parameter :: default = extended
