utility and type_traits don't work in C++11

[ZERICO2005]

/* every header in libc/include */

/* every header in libcxx/include (excluding C++20 <concepts>) */

int main(void) {
	return 0;
}

This compiles fine in c++2b c++20 c++17 c++14 and gnu++2b gnu++20 gnu++17 gnu++14, but I get errors from <type_traits> and <utility> when compiling under C++11 CXXFLAGS = -Wall -Wextra -Wshadow -O0 -std=c++11 (gnu++11 gave the same errors)

/* std::move */
toolchain/CEdev/include/c++/type_traits:304:45: error: 'auto' return without
      trailing return type; deduced return types are a C++14 extension
template<class _Tp> _EZCXX_INLINE constexpr auto move(_Tp&& __value) noexcept {
                                            ^

/* std::swap */
toolchain/CEdev/include/c++/type_traits:309:1: error: no return statement in
      constexpr function
swap(_Tp& __lhs, _Tp& __rhs) noexcept(is_nothrow_move_constructible_v<_Tp> && is_nothrow_move_assignable_v<_Tp>) {
^

/* std::as_const */
toolchain/CEdev/include/c++/utility:32:45: error: 'auto' return without trailing
      return type; deduced return types are a C++14 extension
template<class _Tp> _EZCXX_INLINE constexpr auto as_const(_Tp const&& __value) noexcept = delete;
                                            ^

Going off cppreference, some of these functions may have incorrect prototypes. Commenting out the functions allows the code to compile okay in C++11 otherwise.