Using the PPA's libquadmath makes the tests pass, so I sent the patch upstream:
https://gcc.gnu.org/pipermail/gcc-patches/2024-March/647635.html
Using the PPA's libquadmath makes the tests pass, so I sent the patch upstream:
https:/ /gcc.gnu. org/pipermail/ gcc-patches/ 2024-March/ 647635. html