[Bug libstdc++/120198] [14/15/16 Regression] std::scoped_lock disabled for non-gthread environments (such as arm-none-eabi)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120198

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It doesn't need to require hosted either.