https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88698
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Devin Hussey from comment #2) > It is to be noted that Clang has -Wvector-conversion, which is the > equivalent of -fno-lax-vector-conversions, however, it is a warning that > only occurs with -Weverything. Not even -Wall -Wextra -Wpedantic in C++ mode > will enable it. Sounds like clang decided to emulate GCC 3.4.x behavior and follow newer GCC's behavior.