https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66365
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- Upstream need to fix their code, there is no implicit conversion from basic_istream to bool in C++11, so gcc-5 is correct to reject the code. return static_cast<bool>(is.read(static_cast<char *>(p), len));