[Bug libstdc++/121926] generate_canonical fails for std::float16_t and std::float128_t

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121926

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
You can bootstrap with --with-long-double-format=ieee to tell GCC to default to
IEEE long double on powerpc64le. That's what modern Linux POWER systems should
be using.