[Bug bootstrap/42176] bootstrap fails while building libstdc++-v3 on debian sarge (related to cstdio and similar to #30915)

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42176

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Bug 30915 is similar, and the problem was related to gentoo-specific patches to
glibc. Possibly caused by A mismatched combination of libstdc++ and glibc.

I've never been able to reproduce it, and I don't think it's a GCC problem, so
I agree with closing this. Thanks, Martin.