In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:9:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.h:18:57: error: unknown type name 'size_t'; did you mean '__size_t'?
_LIBCXXABI_HIDDEN void * __aligned_malloc_with_fallback(size_t size);
                                                        ^~~~~~
                                                        __size_t
/usr/include/machine/_types.h:123:24: note: '__size_t' declared here
typedef unsigned long           __size_t;
                                ^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:9:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.h:21:49: error: unknown type name 'size_t'; did you mean '__size_t'?
_LIBCXXABI_HIDDEN void * __calloc_with_fallback(size_t count, size_t size);
                                                ^~~~~~
                                                __size_t
/usr/include/machine/_types.h:123:24: note: '__size_t' declared here
typedef unsigned long           __size_t;
                                ^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:9:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.h:21:63: error: unknown type name 'size_t'; did you mean '__size_t'?
_LIBCXXABI_HIDDEN void * __calloc_with_fallback(size_t count, size_t size);
                                                              ^~~~~~
                                                              __size_t
/usr/include/machine/_types.h:123:24: note: '__size_t' declared here
typedef unsigned long           __size_t;
                                ^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:11:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/__threading_support:15:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/chrono:828:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/compare:124:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/type_traits:1528:32: error: reference to unresolved using declaration
    : public integral_constant<size_t, 0> {};
                               ^
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/cstddef:50:1: note: using declaration annotated with 'using_if_exists' here
using ::size_t _LIBCPP_USING_IF_EXISTS;
^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:11:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/__threading_support:15:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/chrono:828:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/compare:124:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/type_traits:1528:32: error: reference to unresolved using declaration
    : public integral_constant<size_t, 0> {};
                               ^
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/cstddef:50:1: note: using declaration annotated with 'using_if_exists' here
using ::size_t _LIBCPP_USING_IF_EXISTS;
^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:11:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/__threading_support:15:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/chrono:828:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/compare:124:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/type_traits:1530:32: error: reference to unresolved using declaration
    : public integral_constant<size_t, rank<_Tp>::value + 1> {};
                               ^
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/cstddef:50:1: note: using declaration annotated with 'using_if_exists' here
using ::size_t _LIBCPP_USING_IF_EXISTS;
^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:11:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/__threading_support:15:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/chrono:828:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/compare:124:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/type_traits:1530:32: error: reference to unresolved using declaration
    : public integral_constant<size_t, rank<_Tp>::value + 1> {};
                               ^
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/cstddef:50:1: note: using declaration annotated with 'using_if_exists' here
using ::size_t _LIBCPP_USING_IF_EXISTS;
^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:11:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/__threading_support:15:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/chrono:828:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/compare:124:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/type_traits:1531:22: error: reference to unresolved using declaration
template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[_Np]>
                     ^
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/cstddef:50:1: note: using declaration annotated with 'using_if_exists' here
using ::size_t _LIBCPP_USING_IF_EXISTS;
^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:11:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/__threading_support:15:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/chrono:828:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/compare:124:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/type_traits:1532:32: error: reference to unresolved using declaration
    : public integral_constant<size_t, rank<_Tp>::value + 1> {};
                               ^
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/cstddef:50:1: note: using declaration annotated with 'using_if_exists' here
using ::size_t _LIBCPP_USING_IF_EXISTS;
^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:11:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/__threading_support:15:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/chrono:828:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/compare:124:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/type_traits:1532:32: error: reference to unresolved using declaration
    : public integral_constant<size_t, rank<_Tp>::value + 1> {};
                               ^
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/cstddef:50:1: note: using declaration annotated with 'using_if_exists' here
using ::size_t _LIBCPP_USING_IF_EXISTS;
^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:11:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/__threading_support:15:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/chrono:828:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/compare:124:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/type_traits:1544:21: error: reference to unresolved using declaration
template<class _Tp, size_t _Dim = 0>
                    ^
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/cstddef:50:1: note: using declaration annotated with 'using_if_exists' here
using ::size_t _LIBCPP_USING_IF_EXISTS;
^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:11:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/__threading_support:15:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/chrono:828:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/compare:124:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/type_traits:1546:25: error: reference to unresolved using declaration
    : integral_constant<size_t, __array_extent(_Tp, _Dim)> { };
                        ^
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/cstddef:50:1: note: using declaration annotated with 'using_if_exists' here
using ::size_t _LIBCPP_USING_IF_EXISTS;
^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:11:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/__threading_support:15:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/chrono:828:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/compare:124:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/type_traits:1546:25: error: reference to unresolved using declaration
    : integral_constant<size_t, __array_extent(_Tp, _Dim)> { };
                        ^
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/cstddef:50:1: note: using declaration annotated with 'using_if_exists' here
using ::size_t _LIBCPP_USING_IF_EXISTS;
^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:11:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/__threading_support:15:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/chrono:828:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/compare:124:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/type_traits:1580:22: error: reference to unresolved using declaration
template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[_Np]>
                     ^
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/cstddef:50:1: note: using declaration annotated with 'using_if_exists' here
using ::size_t _LIBCPP_USING_IF_EXISTS;
^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:11:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/__threading_support:15:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/chrono:828:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/compare:124:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/type_traits:1593:22: error: reference to unresolved using declaration
template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[_Np]>
                     ^
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/cstddef:50:1: note: using declaration annotated with 'using_if_exists' here
using ::size_t _LIBCPP_USING_IF_EXISTS;
^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:11:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/__threading_support:15:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/chrono:828:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/compare:124:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/type_traits:1934:32: error: reference to unresolved using declaration
    : public integral_constant<size_t, _LIBCPP_ALIGNOF(_Tp)> {};
                               ^
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/cstddef:50:1: note: using declaration annotated with 'using_if_exists' here
using ::size_t _LIBCPP_USING_IF_EXISTS;
^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:11:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/__threading_support:15:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/chrono:828:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/compare:124:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/type_traits:1934:32: error: reference to unresolved using declaration
    : public integral_constant<size_t, _LIBCPP_ALIGNOF(_Tp)> {};
                               ^
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/cstddef:50:1: note: using declaration annotated with 'using_if_exists' here
using ::size_t _LIBCPP_USING_IF_EXISTS;
^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:11:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/__threading_support:15:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/chrono:828:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/compare:124:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/type_traits:1964:18: error: reference to unresolved using declaration
    static const size_t value = _LIBCPP_PREFERRED_ALIGNOF(_Tp);
                 ^
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/cstddef:50:1: note: using declaration annotated with 'using_if_exists' here
using ::size_t _LIBCPP_USING_IF_EXISTS;
^
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxxabi/src/fallback_malloc.cpp:11:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/__threading_support:15:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/chrono:828:
In file included from /usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/compare:124:
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/type_traits:1985:11: error: reference to unresolved using declaration
template <size_t _Align>
          ^
/usr/src/gnu/lib/libcxxabi/../../../gnu/llvm/libcxx/include/cstddef:50:1: note: using declaration annotated with 'using_if_exists' here
using ::size_t _LIBCPP_USING_IF_EXISTS;
^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.