[Bug libstdc++/118455] The program crashes when synchronization with C-i/o is enabled; does not crash when it is disabled.

[lluis.alemany.puig at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118455

--- Comment #2 from llualpu <lluis.alemany.puig at gmail dot com> ---
Yes, I usually use the simpler -D_GLIBCXX_DEBUG and -DDEBUG. But I'll take a
look at -D_GLIBCXX_ASSERTIONS because this is the first time I hear about this.
Thanks!