[Bug libstdc++/115907] Libstdc++ and GCC itself should avoid glibc above 2.34 dependency

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115907

--- Comment #20 from Arsen Arsenović <arsen at gcc dot gnu.org> ---
(In reply to cqwrteur from comment #17)
> Then why? Why does it define _ISOC2X_SOURCE? C++ is not even C.

"it"?  presuming you mean glibc, because _GNU_SOURCES enables all features,
including the C2X specific ones.

note that not enabling those would not fix downgrading being broken.