https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61038
--- Comment #8 from Ben Longbons <b.r.longbons at gmail dot com> --- (In reply to Ed Smith-Rowland from comment #7) > Note to self: you DO need to take care of char... What about multi-char constants, or are they not permitted in C++ UDLs? Normally they get converted to int, so they're not *meaningful*, but ... Also, remember the different prefixes: L for wchar_t, u8 for char-but-utf8, u for char16_t, and U for char32_t unsigned int fourcc = 'ABCD';