https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97653
--- Comment #4 from Michael Meissner <meissner at gcc dot gnu.org> --- You need the patch that fixes PR libgcc/97543, which is another side of the same coin. PR 97543 was about making long double default to 64-bits, PR 97643 is about making long double default to IEEE 128-bit. For both PRs, you need to make sure the modules that deal with IBM 128-bit values using -mabi=ibmlongdouble. And also as a good measure, disable GNU attributes to prevent linker warnings. Here is the patch that should be applied: https://gcc.gnu.org/pipermail/gcc-patches/2020-October/557413.html
