See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107745 for details. s2geometry contains a workaround removing the constexpr optimization (for now on all platforms, but we should restrict that really to powerpc).
Just for completeness' sake: The PPC build failure boils down to a GCC
issue, failing to handle "constexpr double double" arithmetic.
- Bug#1023961: s2geometry doesn't build for all supported p... Matthias Klose
- Bug#1023961: GCC bug Sebastian Späth
