Can't compile using llvm's libcxx: implicit instantiation of undefined template 'std::char_traits<int>' #353
Description
When compiling using clang and libcxx as C++ library there are errors caused by the removal of generic char_traits by LLVM D157058 :
clang++ -I. -std=c++11 -O2 -pipe -march=native \
-o dictgen dict-generate.cpp -Wl,-z,pack-relative-relocs -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -Wl,-O2 -Wl,--sort-common -Wl,-z,separate-code -Wl,-z,noexecstack -fuse-ld=lld -Wl,--thinlto-jobs=all -Wl,--build-id=uuid -Wl,--icf=safe
In file included from dict-generate.cpp:26:
In file included from /usr/include/c++/v1/iostream:45:
In file included from /usr/include/c++/v1/ios:223:
In file included from /usr/include/c++/v1/__locale:27:
/usr/include/c++/v1/string:834:42: error: implicit instantiation of undefined template 'std::char_traits<int>'
834 | static_assert(is_same<_CharT, typename traits_type::char_type>::value,
| ^
dict-generate.cpp:862:18: note: in instantiation of template class 'std::basic_string<int>' requested here
862 | StringOfInts Chld;
| ^
/usr/include/c++/v1/__fwd/string.h:23:29: note: template is declared here
23 | struct _LIBCPP_TEMPLATE_VIS char_traits;
| ^
In file included from dict-generate.cpp:26:
In file included from /usr/include/c++/v1/iostream:45:
In file included from /usr/include/c++/v1/ios:223:
In file included from /usr/include/c++/v1/__locale:27:
In file included from /usr/include/c++/v1/string:652:
/usr/include/c++/v1/string_view:306:42: error: implicit instantiation of undefined template 'std::char_traits<int>'
306 | static_assert(is_same<_CharT, typename traits_type::char_type>::value,
| ^
/usr/include/c++/v1/__type_traits/is_convertible.h:23:60: note: in instantiation of template class 'std::basic_string_view<int>' requested here
23 | : public integral_constant<bool, __is_convertible(_T1, _T2)> {};
| ^
/usr/include/c++/v1/string:750:29: note: in instantiation of template class 'std::is_convertible<const int &, std::basic_string_view<int>>' requested here
750 | : public _BoolConstant< is_convertible<const _Tp&, basic_string_view<_CharT, _Traits> >::value &&
| ^
/usr/include/c++/v1/string:1368:27: note: in instantiation of template class 'std::__can_be_converted_to_string_view<int, std::char_traits<int>, int>'
requested here
1368 | __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
| ^
/usr/include/c++/v1/string:1372:3: note: while substituting prior template arguments into non-type template parameter [with _Tp = int]
1372 | operator+=(const _Tp& __t) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
1373 | __self_view __sv = __t;
| ~~~~~~~~~~~~~~~~~~~~~~~
1374 | return append(__sv);
| ~~~~~~~~~~~~~~~~~~~~
1375 | }
| ~
dict-generate.cpp:872:14: note: while substituting deduced template arguments into function template 'operator+=' [with _Tp = int, $1 = (no value)]
872 | Chld += i;
| ^
/usr/include/c++/v1/__fwd/string.h:23:29: note: template is declared here
23 | struct _LIBCPP_TEMPLATE_VIS char_traits;