https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97653
--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> --- Also, the docs for --with-long-double-128 say When neither of these configure options are used, the default will be 128-bit long double when built against GNU C Library 2.4 and later, 64-bit long double otherwise.
