[Bug libstdc++/125450] [16/17 Regression] std::optional breaks in C++26 freestanding mode

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125450

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Ah thanks. I tested it with a full --enable-hosted-libstdcxx build using
-ffreestanding and everything compiles, but that's got a full set of headers
available.