[Bug c/124830] c/c-decl.cc Fails to cross compile with C++20 host compiler

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124830

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
In case it matters this is seen with glibc 2.42