Lots of Warnings on Windows

[TaeZStkyoht]

There are lots of warnings with built on Windows:

blabla\vcpkg\installed\x86-windows\include\mailio\codec.hpp(80,42): warning C4251: 'mailio::codec::ASTERISK_STR': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::codec' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\codec.hpp(100,39): warning C4251: 'mailio::codec::EQUAL_STR': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::codec' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\codec.hpp(110,39): warning C4251: 'mailio::codec::SPACE_STR': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::codec' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\codec.hpp(130,37): warning C4251: 'mailio::codec::DOT_STR': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::codec' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\codec.hpp(140,39): warning C4251: 'mailio::codec::COMMA_STR': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::codec' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\codec.hpp(150,39): warning C4251: 'mailio::codec::COLON_STR': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::codec' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\codec.hpp(160,43): warning C4251: 'mailio::codec::SEMICOLON_STR': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::codec' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\codec.hpp(190,39): warning C4251: 'mailio::codec::QUOTE_STR': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::codec' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\codec.hpp(235,43): warning C4251: 'mailio::codec::LESS_THAN_STR': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::codec' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\codec.hpp(245,46): warning C4251: 'mailio::codec::GREATER_THAN_STR': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::codec' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\codec.hpp(255,40): warning C4251: 'mailio::codec::HEX_DIGITS': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::codec' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\codec.hpp(260,41): warning C4251: 'mailio::codec::END_OF_LINE': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::codec' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\codec.hpp(265,44): warning C4251: 'mailio::codec::END_OF_MESSAGE': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::codec' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(411,49): warning C4251: 'mailio::mime::CONTENT_TYPE_HEADER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(416,62): warning C4251: 'mailio::mime::CONTENT_TRANSFER_ENCODING_HEADER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(421,62): warning C4251: 'mailio::mime::CONTENT_TRANSFER_ENCODING_BASE64': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(426,60): warning C4251: 'mailio::mime::CONTENT_TRANSFER_ENCODING_BIT7': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(431,60): warning C4251: 'mailio::mime::CONTENT_TRANSFER_ENCODING_BIT8': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(436,72): warning C4251: 'mailio::mime::CONTENT_TRANSFER_ENCODING_QUOTED_PRINTABLE': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(441,62): warning C4251: 'mailio::mime::CONTENT_TRANSFER_ENCODING_BINARY': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(446,56): warning C4251: 'mailio::mime::CONTENT_DISPOSITION_HEADER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(451,60): warning C4251: 'mailio::mime::CONTENT_DISPOSITION_ATTACHMENT': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(456,56): warning C4251: 'mailio::mime::CONTENT_DISPOSITION_INLINE': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(461,45): warning C4251: 'mailio::mime::NEW_LINE_INDENT': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(476,50): warning C4251: 'mailio::mime::HEADER_SEPARATOR_STR': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(486,54): warning C4251: 'mailio::mime::NAME_VALUE_SEPARATOR_STR': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(496,54): warning C4251: 'mailio::mime::ATTRIBUTES_SEPARATOR_STR': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(501,44): warning C4251: 'mailio::mime::ATTRIBUTE_NAME': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(506,48): warning C4251: 'mailio::mime::ATTRIBUTE_FILENAME': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(511,48): warning C4251: 'mailio::mime::BOUNDARY_DELIMITER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(516,35): warning C4251: 'mailio::mime::QTEXT': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(521,48): warning C4251: 'mailio::mime::HEADER_NAME_REGEX': class 'boost::basic_regex<char,boost::regex_traits<char,boost::w32_regex_traits<charT>>>' needs to have dll-interface to be used by clients of class 'mailio::mime' 1> with 1> [ 1> charT=char 1> ] blabla\vcpkg\installed\x86-windows\include\boost\regex\v4\regex_fwd.hpp(60): message : see declaration of 'boost::basic_regex<char,boost::regex_traits<char,boost::w32_regex_traits<charT>>>' 1> with 1> [ 1> charT=char 1> ] blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(526,49): warning C4251: 'mailio::mime::HEADER_VALUE_REGEX': class 'boost::basic_regex<char,boost::regex_traits<char,boost::w32_regex_traits<charT>>>' needs to have dll-interface to be used by clients of class 'mailio::mime' 1> with 1> [ 1> charT=char 1> ] blabla\vcpkg\installed\x86-windows\include\boost\regex\v4\regex_fwd.hpp(60): message : see declaration of 'boost::basic_regex<char,boost::regex_traits<char,boost::w32_regex_traits<charT>>>' 1> with 1> [ 1> charT=char 1> ] blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(531,51): warning C4251: 'mailio::mime::CONTENT_ATTR_ALPHABET': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(536,59): warning C4251: 'mailio::mime::CONTENT_HEADER_VALUE_ALPHABET': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(701,26): warning C4251: 'mailio::mime::_boundary': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(706,25): warning C4251: 'mailio::mime::_version': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(736,33): warning C4251: 'mailio::mime::_content_type': struct 'mailio::mime::content_type_t' needs to have dll-interface to be used by clients of class 'mailio::mime' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(69): message : see declaration of 'mailio::mime::content_type_t' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(743,22): warning C4251: 'mailio::mime::_name': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(761,25): warning C4251: 'mailio::mime::_content': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::mime' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(766,29): warning C4251: 'mailio::mime::_parts': class 'std::vector<mailio::mime,std::allocatormailio::mime>' needs to have dll-interface to be used by clients of class 'mailio::mime' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(319): message : see declaration of 'std::vector<mailio::mime,std::allocatormailio::mime>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(776,45): warning C4251: 'mailio::mime::_parsed_headers': class 'std::vector<std::string,std::allocatorstd::string>' needs to have dll-interface to be used by clients of class 'mailio::mime' blabla\vcpkg\installed\x86-windows\include\nlohmann\detail\json_pointer.hpp(740): message : see declaration of 'std::vector<std::string,std::allocatorstd::string>' blabla\vcpkg\installed\x86-windows\include\mailio\mime.hpp(781,42): warning C4251: 'mailio::mime::_parsed_body': class 'std::vector<std::string,std::allocatorstd::string>' needs to have dll-interface to be used by clients of class 'mailio::mime' blabla\vcpkg\installed\x86-windows\include\nlohmann\detail\json_pointer.hpp(740): message : see declaration of 'std::vector<std::string,std::allocatorstd::string>' blabla\vcpkg\installed\x86-windows\include\mailio\mailboxes.hpp(33,21): warning C4251: 'mailio::mail_address::name': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of struct 'mailio::mail_address' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mailboxes.hpp(38,24): warning C4251: 'mailio::mail_address::address': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of struct 'mailio::mail_address' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mailboxes.hpp(88,21): warning C4251: 'mailio::mail_group::name': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of struct 'mailio::mail_group' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\mailboxes.hpp(93,38): warning C4251: 'mailio::mail_group::members': class 'std::vector<mailio::mail_address,std::allocatormailio::mail_address>' needs to have dll-interface to be used by clients of struct 'mailio::mail_group' blabla\vcpkg\installed\x86-windows\include\mailio\mailboxes.hpp(93): message : see declaration of 'std::vector<mailio::mail_address,std::allocatormailio::mail_address>' blabla\vcpkg\installed\x86-windows\include\mailio\mailboxes.hpp(142,40): warning C4251: 'mailio::mailboxes::addresses': class 'std::vector<mailio::mail_address,std::allocatormailio::mail_address>' needs to have dll-interface to be used by clients of struct 'mailio::mailboxes' blabla\vcpkg\installed\x86-windows\include\mailio\mailboxes.hpp(93): message : see declaration of 'std::vector<mailio::mail_address,std::allocatormailio::mail_address>' blabla\vcpkg\installed\x86-windows\include\mailio\mailboxes.hpp(147,35): warning C4251: 'mailio::mailboxes::groups': class 'std::vector<mailio::mail_group,std::allocatormailio::mail_group>' needs to have dll-interface to be used by clients of struct 'mailio::mailboxes' blabla\vcpkg\installed\x86-windows\include\mailio\mailboxes.hpp(147): message : see declaration of 'std::vector<mailio::mail_group,std::allocatormailio::mail_group>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(50,47): warning C4251: 'mailio::message::ADDRESS_BEGIN_STR': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(60,45): warning C4251: 'mailio::message::ADDRESS_END_STR': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(458,35): warning C4251: 'mailio::message::ATEXT': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(463,35): warning C4251: 'mailio::message::DTEXT': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(468,41): warning C4251: 'mailio::message::FROM_HEADER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(473,43): warning C4251: 'mailio::message::SENDER_HEADER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(478,45): warning C4251: 'mailio::message::REPLY_TO_HEADER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(483,39): warning C4251: 'mailio::message::TO_HEADER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(488,39): warning C4251: 'mailio::message::CC_HEADER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(493,40): warning C4251: 'mailio::message::BCC_HEADER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(498,47): warning C4251: 'mailio::message::MESSAGE_ID_HEADER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(503,48): warning C4251: 'mailio::message::IN_REPLY_TO_HEADER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(508,47): warning C4251: 'mailio::message::REFERENCES_HEADER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(513,44): warning C4251: 'mailio::message::SUBJECT_HEADER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(518,41): warning C4251: 'mailio::message::DATE_HEADER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(524,61): warning C4251: 'mailio::message::DISPOSITION_NOTIFICATION_HEADER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(529,49): warning C4251: 'mailio::message::MIME_VERSION_HEADER': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(695,28): warning C4251: 'mailio::message::_message_id': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(700,42): warning C4251: 'mailio::message::_in_reply_to': class 'std::vector<std::string,std::allocatorstd::string>' needs to have dll-interface to be used by clients of class 'mailio::message' blabla\vcpkg\installed\x86-windows\include\nlohmann\detail\json_pointer.hpp(740): message : see declaration of 'std::vector<std::string,std::allocatorstd::string>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(705,41): warning C4251: 'mailio::message::_references': class 'std::vector<std::string,std::allocatorstd::string>' needs to have dll-interface to be used by clients of class 'mailio::message' blabla\vcpkg\installed\x86-windows\include\nlohmann\detail\json_pointer.hpp(740): message : see declaration of 'std::vector<std::string,std::allocatorstd::string>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(710,25): warning C4251: 'mailio::message::_subject': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::message' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(715,67): warning C4251: 'mailio::message::_date_time': class 'std::shared_ptrboost::local_time::local_date_time' needs to have dll-interface to be used by clients of class 'mailio::message' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(715): message : see declaration of 'std::shared_ptrboost::local_time::local_date_time' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(720,53): warning C4251: 'mailio::message::_headers': class 'std::multimap<std::string,std::string,std::lessstd::string,std::allocator<std::pair<const std::string,std::string>>>' needs to have dll-interface to be used by clients of class 'mailio::message' blabla\vcpkg\installed\x86-windows\include\mailio\message.hpp(451): message : see declaration of 'std::multimap<std::string,std::string,std::lessstd::string,std::allocator<std::pair<const std::string,std::string>>>' 1>Please define _WIN32_WINNT or _WIN32_WINDOWS appropriately. For example: 1>- add -D_WIN32_WINNT=0x0601 to the compiler command line; or 1>- add _WIN32_WINNT=0x0601 to your project's Preprocessor Definitions. 1>Assuming _WIN32_WINNT=0x0601 (i.e. Windows 7 target). blabla\vcpkg\installed\x86-windows\include\mailio\dialog.hpp(155,32): warning C4251: 'mailio::dialog::_hostname': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::dialog' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\dialog.hpp(165,40): warning C4251: 'mailio::dialog::_ios': class 'boost::asio::io_context' needs to have dll-interface to be used by clients of class 'mailio::dialog' blabla\vcpkg\installed\x86-windows\include\boost\asio\io_context.hpp(212): message : see declaration of 'boost::asio::io_context' blabla\vcpkg\installed\x86-windows\include\mailio\dialog.hpp(170,58): warning C4251: 'mailio::dialog::_socket': class 'std::shared_ptrboost::asio::ip::tcp::socket' needs to have dll-interface to be used by clients of class 'mailio::dialog' blabla\vcpkg\installed\x86-windows\include\mailio\dialog.hpp(149): message : see declaration of 'std::shared_ptrboost::asio::ip::tcp::socket' blabla\vcpkg\installed\x86-windows\include\mailio\dialog.hpp(175,56): warning C4251: 'mailio::dialog::_timer': class 'std::shared_ptrboost::asio::deadline_timer' needs to have dll-interface to be used by clients of class 'mailio::dialog' blabla\vcpkg\installed\x86-windows\include\mailio\dialog.hpp(150): message : see declaration of 'std::shared_ptrboost::asio::deadline_timer' blabla\vcpkg\installed\x86-windows\include\mailio\dialog.hpp(180,39): warning C4251: 'mailio::dialog::_timeout': class 'std::chrono::duration<__int64,std::milli>' needs to have dll-interface to be used by clients of class 'mailio::dialog' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\chrono(465): message : see declaration of 'std::chrono::duration<__int64,std::milli>' blabla\vcpkg\installed\x86-windows\include\mailio\dialog.hpp(190,53): warning C4251: 'mailio::dialog::_strmbuf': class 'std::shared_ptrboost::asio::streambuf' needs to have dll-interface to be used by clients of class 'mailio::dialog' blabla\vcpkg\installed\x86-windows\include\mailio\dialog.hpp(190): message : see declaration of 'std::shared_ptrboost::asio::streambuf' blabla\vcpkg\installed\x86-windows\include\mailio\dialog.hpp(195,41): warning C4251: 'mailio::dialog::_istrm': class 'std::shared_ptrstd::istream' needs to have dll-interface to be used by clients of class 'mailio::dialog' blabla\vcpkg\installed\x86-windows\include\mailio\dialog.hpp(195): message : see declaration of 'std::shared_ptrstd::istream' blabla\vcpkg\installed\x86-windows\include\mailio\smtp.hpp(204,26): warning C4251: 'mailio::smtp::_src_host': class 'std::basic_string<char,std::char_traits,std::allocator>' needs to have dll-interface to be used by clients of class 'mailio::smtp' blablaOther\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\include\xstring(4648): message : see declaration of 'std::basic_string<char,std::char_traits,std::allocator>' blabla\vcpkg\installed\x86-windows\include\mailio\smtp.hpp(209,33): warning C4251: 'mailio::smtp::_dlg': class 'std::shared_ptrmailio::dialog' needs to have dll-interface to be used by clients of class 'mailio::smtp' blabla\vcpkg\installed\x86-windows\include\mailio\smtp.hpp(209): message : see declaration of 'std::shared_ptrmailio::dialog'