https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108309
--- Comment #3 from tim blechmann <tim at klingt dot org> --- > That is a conditionally supported construct in C++. clang does not support it > but GCC does. > > GCC does warn with -Wconditionally-supported interesting. i may have to reduce it manually rather than going through cvise: the real-world code builds with clang and gcc doesn't seem to emit a warning with -Wconditionally-supported
