https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114940
--- Comment #4 from Timothy Liu Xuefeng <liuxf19 at 163 dot com> --- (In reply to Jonathan Wakely from comment #2) > It's not optional, it's a required feature in C++14 and later. Failing to > provide it is non-conforming, although GCC can be requested to be > non-conforming the same way with -fno-sized-deallocation. Using that, the > same error happens with GCC. > > We should either disable __cpp_lib_generator when __cpp_sized_deallocation > is not defined, or change <generator> to not depend on it unconditionally. Yeah, I agree. Since -fsized-deallocation is not the default behavior of clang++, reporting errors in <generator> seems strange.
