Build warning in 6.2.1 on Windows using MSVC compiler

[0x8000-0000]

Building in release mode, I'm getting this "level 2" warning:

C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\xutility(3606,22): error C2220: the following warning is treated as an error [C:\Users\fiucha\source\repos\tng.conan\lib\tng\log\logger_impl.vcxproj]
C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\xutility(3643): message : see reference to function template instantiation '_OutIt std::_Copy_unchecked<_InIt,_OutIt>(_InIt,_InIt,_OutIt)' being compiled [C:\Users\fiucha\source\repos\tng.conan\lib\tng\log\logger_impl.vcxproj]
          with
          [
              _OutIt=std::back_insert_iterator<fmt::v6::basic_memory_buffer<char,500,std::allocator<char>>>,
              _InIt=const wchar_t *
          ]
C:\Users\fiucha\.conan\data\fmt\6.2.1\_\_\package\3fb49604f9c2f729b85ba3115852006824e72cab\include\fmt/chrono.h(778): message : see reference to function template instantiation '_OutIt std::copy<const wchar_t*,OutputIt>(_InIt,_InIt,_OutIt)' being compiled [C:\Users\fiucha\source\repos\tng.conan\lib\tng\log\logger_impl.vcxproj]
          with
          [
              _OutIt=std::back_insert_iterator<fmt::v6::basic_memory_buffer<char,500,std::allocator<char>>>,
              OutputIt=std::back_insert_iterator<fmt::v6::basic_memory_buffer<char,500,std::allocator<char>>>,
              _InIt=const wchar_t *
          ]
C:\Users\fiucha\.conan\data\fmt\6.2.1\_\_\package\3fb49604f9c2f729b85ba3115852006824e72cab\include\fmt/chrono.h(1105): message : see reference to function template instantiation 'OutputIt fmt::v6::internal::format_duration_unit<Char,Period,std::back_insert_iterator<fmt::v6::basic_memory_buffer<char,500,std::allocator<char>>>>(OutputIt)' being compiled [C:\Users\fiucha\source\repos\tng.conan\lib\tng\log\logger_impl.vcxproj]
          with
          [
              OutputIt=std::back_insert_iterator<fmt::v6::basic_memory_buffer<char,500,std::allocator<char>>>,
              Char=char,
              Period=std::chrono::system_clock::period
          ]
C:\Users\fiucha\.conan\data\fmt\6.2.1\_\_\package\3fb49604f9c2f729b85ba3115852006824e72cab\include\fmt\core.h(899): message : see reference to function template instantiation 'std::back_insert_iterator<fmt::v6::internal::buffer<char>> fmt::v6::formatter<Arg,char,void>::format<Context>(const std::chrono::duration<std::chrono::system_clock::rep,std::chrono::system_clock::period> &,FormatContext &)' being compiled [C:\Users\fiucha\source\repos\tng.conan\lib\tng\log\logger_impl.vcxproj]
          with
          [
              Arg=std::chrono::duration<std::chrono::system_clock::rep,std::chrono::system_clock::period>,
              Context=fmt::v6::format_context,
              FormatContext=fmt::v6::format_context
          ]
C:\Users\fiucha\.conan\data\fmt\6.2.1\_\_\package\3fb49604f9c2f729b85ba3115852006824e72cab\include\fmt\core.h(899): message : see reference to function template instantiation 'std::back_insert_iterator<fmt::v6::internal::buffer<char>> fmt::v6::formatter<Arg,char,void>::format<Context>(const std::chrono::duration<std::chrono::system_clock::rep,std::chrono::system_clock::period> &,FormatContext &)' being compiled [C:\Users\fiucha\source\repos\tng.conan\lib\tng\log\logger_impl.vcxproj]
          with
          [
              Arg=std::chrono::duration<std::chrono::system_clock::rep,std::chrono::system_clock::period>,
              Context=fmt::v6::format_context,
              FormatContext=fmt::v6::format_context
          ]
C:\Users\fiucha\.conan\data\fmt\6.2.1\_\_\package\3fb49604f9c2f729b85ba3115852006824e72cab\include\fmt\core.h(886): message : see reference to function template instantiation 'void fmt::v6::internal::value<Context>::format_custom_arg<T,fmt::v6::formatter<T,char,void>>(const void *,fmt::v6::basic_format_parse_context<char,fmt::v6::internal::error_handler> &,Context &)' being compiled [C:\Users\fiucha\source\repos\tng.conan\lib\tng\log\logger_impl.vcxproj]
          with
          [
              Context=fmt::v6::format_context,
              T=std::chrono::duration<std::chrono::system_clock::rep,std::chrono::system_clock::period>
          ]

I'm not building with any special Unicode options, but at some point chars and wchar_t's get mixed.

[dejoma]

same issue here!

[vitaut]

Same as #1649 which is already fixed in master.