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None of these traits depend on libc support for wchar_t, so they should be defined unconditionally. The wchar_t type is always defined in C++. libstdc++-v3/ChangeLog: PR libstdc++/98725 * include/c_global/cstddef [!_GLIBCXX_USE_WCHAR_T] (__byte_operand<wchar_t>): Define specialization. * include/std/type_traits (__make_signed<wchar_t>) (__make_unsigned<wchar_t>): Remove redundant check for __WCHAR_TYPE__ being defined. * include/tr1/type_traits [!_GLIBCXX_USE_WCHAR_T] (__is_integral_helper<wchar_t>): Likewise.