[llvm-dev] Using LLD to link against third-party libraries? How?

[Osman Zakir via llvm-dev]

In my code here https://github.com/DragonOsman/currency_converter , I used C++17 and managed to get it to work (though I'm only using std::map::insert_or_assign() from C++17).  And I'm using Windows, so I shouldn't use LDFLAGS or CXXFLAGS as environment variables.  I'll use them directly on the compiler command line instead.  The libraries I need to link against are C:/boost_1_68_0/stage/lib/libboost_system-vc141-mt-x64-1_68.lib and C:/Jinja2Cpp/install_x64/lib/static/jinja2cpp.lib.

I tried to build it with this flag:
"
clang++ -std=c++17 -Wall -pedantic -D_SILENCE_CXX17_ADAPTOR_TYPEDEFS_DEPRECATION_WARNING -Dvariant_CONFIG_SELECT_VARIANT=variant_VARIANT_NONSTD -D_SILENCE_CXX17_ALLOCATOR_VOID_DEPRECATION_WARNING -D_CRT_SECURE_NO_WARNINGS -D_WINSOCK_DEPRECATED_NO_WARNINGS -D_WIN32 -D_WIN32_WINDOWS -D_NDEBUG -fexceptions -IC:/Jinja2Cpp/install_x64/include -IC:/json/single_include -IC:/boost_1_68_0 -LC:/boost_1_68_0/stage/lib/libboost_system-vc141-mt-x64-1_68.lib -LC:/Jinja2Cpp/install_x64/lib/static/jinja2cpp.lib currency_converter.cpp -o currency_converter.exe
"
And I got these warnings and errors from LLD:

"
lld-link: warning: C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o: locally defined symbol imported: __std_terminate (defined in libvcruntime.lib(ehhelpers.obj)) [LNK4217]
lld-link: error: undefined symbol: "public: __cdecl jinja2::Template::Template(class jinja2::TemplateEnv *)" (??0Template at jinja2@@QEAA at PEAVTemplateEnv@1@@Z)​
>>> referenced by C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o:("void __cdecl handle_request<struct boost::beast::http::basic_string_body<char, struct std::char_traits<char>, class std::allocator<char>>, class std::allocator<char>, struct server_session::send_lambda &>(class boost::basic_string_view<char, struct std::char_traits<char>>, struct boost::beast::http::message<1, struct boost::beast::http::basic_string_body<char, struct std::char_traits<char>, class std::allocator<char>>, class boost::beast::http::basic_fields<class std::allocator<char>>> &&, struct server_session::send_lambda &, char const *, char const *)" (??$handle_request at U?$basic_string_body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@@V?$allocator at D@std@@AEAUsend_lambda at server_session@@@@YAXV?$basic_string_view at DU?$char_traits at D@std@@@boost@@$$QEAU?$message@$00U?$basic_string_body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@@V?$basic_fields at V?$allocator at D@std@@@234@@http at beast@1 at AEAUsend_lambda@server_session@@PEBD3 at Z))​
​
lld-link: error: undefined symbol: "public: class nonstd::expected_lite::expected<void, class jinja2::ErrorInfoTpl<char>> __cdecl jinja2::Template::LoadFromFile(class std::basic_string<char, struct std::char_traits<char>, class std::allocator<char>> const &)" (?LoadFromFile at Template@jinja2@@QEAA?AV?$expected at XV?$ErrorInfoTpl at D@jinja2@@@expected_lite at nonstd@@AEBV?$basic_string at DU?$char_traits at D@std@@V?$allocator at D@2@@std@@@Z)​
>>> referenced by C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o:("void __cdecl handle_request<struct boost::beast::http::basic_string_body<char, struct std::char_traits<char>, class std::allocator<char>>, class std::allocator<char>, struct server_session::send_lambda &>(class boost::basic_string_view<char, struct std::char_traits<char>>, struct boost::beast::http::message<1, struct boost::beast::http::basic_string_body<char, struct std::char_traits<char>, class std::allocator<char>>, class boost::beast::http::basic_fields<class std::allocator<char>>> &&, struct server_session::send_lambda &, char const *, char const *)" (??$handle_request at U?$basic_string_body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@@V?$allocator at D@std@@AEAUsend_lambda at server_session@@@@YAXV?$basic_string_view at DU?$char_traits at D@std@@@boost@@$$QEAU?$message@$00U?$basic_string_body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@@V?$basic_fields at V?$allocator at D@std@@@234@@http at beast@1 at AEAUsend_lambda@server_session@@PEBD3 at Z))​
​
lld-link: error: undefined symbol: "public: class std::basic_string<char, struct std::char_traits<char>, class std::allocator<char>> __cdecl jinja2::Template::RenderAsString(class std::unordered_map<class std::basic_string<char, struct std::char_traits<char>, class std::allocator<char>>, class jinja2::Value, struct std::hash<class std::basic_string<char, struct std::char_traits<char>, class std::allocator<char>>>, struct std::equal_to<class std::basic_string<char, struct std::char_traits<char>, class std::allocator<char>>>, class std::allocator<struct std::pair<class std::basic_string<char, struct std::char_traits<char>, class std::allocator<char>> const, class jinja2::Value>>> const &)" (?RenderAsString at Template@jinja2@@QEAA?AV?$basic_string at DU?$char_traits at D@std@@V?$allocator at D@2@@std@@AEBV?$unordered_map at V?$basic_string at DU?$char_traits at D@std@@V?$allocator at D@2@@std@@VValue at jinja2@@U?$hash at V?$basic_string at DU?$char_traits at D@std@@V?$allocator at D@2@@std@@@2 at U?$equal_to at V?$basic_string at DU?$char_traits at D@std@@V?$allocator at D@2@@std@@@2 at V?$allocator at U?$pair@$$CBV?$basic_string at DU?$char_traits at D@std@@V?$allocator at D@2@@std@@VValue at jinja2@@@std@@@2@@4@@Z)​
>>> referenced by C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o:("void __cdecl handle_request<struct boost::beast::http::basic_string_body<char, struct std::char_traits<char>, class std::allocator<char>>, class std::allocator<char>, struct server_session::send_lambda &>(class boost::basic_string_view<char, struct std::char_traits<char>>, struct boost::beast::http::message<1, struct boost::beast::http::basic_string_body<char, struct std::char_traits<char>, class std::allocator<char>>, class boost::beast::http::basic_fields<class std::allocator<char>>> &&, struct server_session::send_lambda &, char const *, char const *)" (??$handle_request at U?$basic_string_body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@@V?$allocator at D@std@@AEAUsend_lambda at server_session@@@@YAXV?$basic_string_view at DU?$char_traits at D@std@@@boost@@$$QEAU?$message@$00U?$basic_string_body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@@V?$basic_fields at V?$allocator at D@std@@@234@@http at beast@1 at AEAUsend_lambda@server_session@@PEBD3 at Z))​
>>> referenced by C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o:("void __cdecl handle_request<struct boost::beast::http::basic_string_body<char, struct std::char_traits<char>, class std::allocator<char>>, class std::allocator<char>, struct server_session::send_lambda &>(class boost::basic_string_view<char, struct std::char_traits<char>>, struct boost::beast::http::message<1, struct boost::beast::http::basic_string_body<char, struct std::char_traits<char>, class std::allocator<char>>, class boost::beast::http::basic_fields<class std::allocator<char>>> &&, struct server_session::send_lambda &, char const *, char const *)" (??$handle_request at U?$basic_string_body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@@V?$allocator at D@std@@AEAUsend_lambda at server_session@@@@YAXV?$basic_string_view at DU?$char_traits at D@std@@@boost@@$$QEAU?$message@$00U?$basic_string_body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@@V?$basic_fields at V?$allocator at D@std@@@234@@http at beast@1 at AEAUsend_lambda@server_session@@PEBD3 at Z))​
​
lld-link: error: undefined symbol: "public: __cdecl jinja2::Template::~Template(void)" (??1Template at jinja2@@QEAA at XZ)​
>>> referenced by C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o:("void __cdecl handle_request<struct boost::beast::http::basic_string_body<char, struct std::char_traits<char>, class std::allocator<char>>, class std::allocator<char>, struct server_session::send_lambda &>(class boost::basic_string_view<char, struct std::char_traits<char>>, struct boost::beast::http::message<1, struct boost::beast::http::basic_string_body<char, struct std::char_traits<char>, class std::allocator<char>>, class boost::beast::http::basic_fields<class std::allocator<char>>> &&, struct server_session::send_lambda &, char const *, char const *)" (??$handle_request at U?$basic_string_body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@@V?$allocator at D@std@@AEAUsend_lambda at server_session@@@@YAXV?$basic_string_view at DU?$char_traits at D@std@@@boost@@$$QEAU?$message@$00U?$basic_string_body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@@V?$basic_fields at V?$allocator at D@std@@@234@@http at beast@1 at AEAUsend_lambda@server_session@@PEBD3 at Z))​
>>> referenced by C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o:("int `void __cdecl handle_request<struct boost::beast::http::basic_string_body<char, struct std::char_traits<char>, class std::allocator<char>>, class std::allocator<char>, struct server_session::send_lambda &>(class boost::basic_string_view<char, struct std::char_traits<char>>, struct basic_string_view<char, struct std::char_traits<char>>::beast::http::message<1, struct boost::beast::http::basic_string_body<char, struct std::char_traits<char>, class std::allocator<char>>, class boost::beast::http::basic_fields<class std::allocator<char>>> &&, struct server_session::send_lambda &, char const *, char const *)'::`1'::dtor$114" (?dtor$114@?0???$handle_request at U?$basic_string_body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@@V?$allocator at D@std@@AEAUsend_lambda at server_session@@@@YAXV?$basic_string_view at DU?$char_traits at D@std@@@boost@@$$QEAU?$message@$00U?$basic_string_body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@@V?$basic_fields at V?$allocator at D@std@@@234@@http at beast@1 at AEAUsend_lambda@server_session@@PEBD3 at Z@4HA))​
​
lld-link: warning: C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o: locally defined symbol imported: _CxxThrowException (defined in libvcruntime.lib(throw.obj)) [LNK4217]​
lld-link: error: undefined symbol: "class boost::system::error_category const & __cdecl boost::system::detail::system_category_ncx(void)" (?system_category_ncx at detail@system at boost@@YAAEBVerror_category at 23@XZ)​
>>> referenced by C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o:("class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category at system@boost@@YAAEBVerror_category at 12@XZ))​
​
lld-link: warning: C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o: locally defined symbol imported: __RTDynamicCast (defined in libvcruntime.lib(rtti.obj)) [LNK4217]​
lld-link: error: undefined symbol: "class boost::system::error_category const & __cdecl boost::system::detail::generic_category_ncx(void)" (?generic_category_ncx at detail@system at boost@@YAAEBVerror_category at 23@XZ)​
>>> referenced by C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o:("class boost::system::error_category const & __cdecl boost::system::generic_category(void)" (?generic_category at system@boost@@YAAEBVerror_category at 12@XZ))​
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
"
[https://avatars0.githubusercontent.com/u/18173932?s=400&v=4]<https://github.com/DragonOsman/currency_converter>

GitHub - DragonOsman/currency_converter: Application for Computer Science course<https://github.com/DragonOsman/currency_converter>
Google Maps + Currency Converter Web Application. Application for Computer Science course. This is a currency converter web application with the frontend and a backend.
github.com



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