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I'm trying to build a solution in Visual Studio 2017. And I get these errors:

1>------ Build started: Project: UA_Parser, Configuration: Release x64 ------
1>UaParserTest.cpp
1>UaParser.obj : error LNK2001: unresolved external symbol "class YAML::Node __cdecl YAML::LoadFile(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?LoadFile@YAML@@YA?AVNode@1@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
1>UaParser.obj : error LNK2001: unresolved external symbol "public: virtual __cdecl YAML::InvalidNode::~InvalidNode(void)" (??1InvalidNode@YAML@@UEAA@XZ)
1>UaParser.obj : error LNK2001: unresolved external symbol "public: virtual __cdecl YAML::Exception::~Exception(void)" (??1Exception@YAML@@UEAA@XZ)
1>UaParser.obj : error LNK2001: unresolved external symbol "public: virtual __cdecl YAML::RepresentationException::~RepresentationException(void)" (??1RepresentationException@YAML@@UEAA@XZ)
1>UaParser.obj : error LNK2001: unresolved external symbol "public: virtual __cdecl YAML::BadConversion::~BadConversion(void)" (??1BadConversion@YAML@@UEAA@XZ)
1>UaParser.obj : error LNK2001: unresolved external symbol "public: virtual __cdecl YAML::BadSubscript::~BadSubscript(void)" (??1BadSubscript@YAML@@UEAA@XZ)
1>UaParser.obj : error LNK2001: unresolved external symbol "public: class YAML::detail::node & __cdecl YAML::detail::memory::create_node(void)" (?create_node@memory@detail@YAML@@QEAAAEAVnode@23@XZ)
1>UaParser.obj : error LNK2001: unresolved external symbol "private: void __cdecl YAML::detail::node_data::convert_to_map(class std::shared_ptr<class YAML::detail::memory_holder>)" (?convert_to_map@node_data@detail@YAML@@AEAAXV?$shared_ptr@Vmemory_holder@detail@YAML@@@std@@@Z)
1>UaParser.obj : error LNK2001: unresolved external symbol "private: void __cdecl YAML::detail::node_data::insert_map_pair(class YAML::detail::node &,class YAML::detail::node &)" (?insert_map_pair@node_data@detail@YAML@@AEAAXAEAVnode@23@0@Z)
1>UaParser.obj : error LNK2001: unresolved external symbol "public: class YAML::detail::node_iterator_base<class YAML::detail::node> __cdecl YAML::detail::node_data::end(void)" (?end@node_data@detail@YAML@@QEAA?AV?$node_iterator_base@Vnode@detail@YAML@@@23@XZ)
1>UaParser.obj : error LNK2001: unresolved external symbol "public: class YAML::detail::node_iterator_base<class YAML::detail::node> __cdecl YAML::detail::node_data::begin(void)" (?begin@node_data@detail@YAML@@QEAA?AV?$node_iterator_base@Vnode@detail@YAML@@@23@XZ)
1>UaParser.obj : error LNK2001: unresolved external symbol "public: void __cdecl YAML::detail::node_data::set_scalar(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?set_scalar@node_data@detail@YAML@@QEAAXAEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
1>UaParser.obj : error LNK2001: unresolved external symbol "public: void __cdecl YAML::detail::node_data::set_null(void)" (?set_null@node_data@detail@YAML@@QEAAXXZ)
1>UaParser.obj : error LNK2001: unresolved external symbol "public: void __cdecl YAML::detail::node_data::mark_defined(void)" (?mark_defined@node_data@detail@YAML@@QEAAXXZ)
1>UaParser.obj : error LNK2001: unresolved external symbol "public: static class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > YAML::detail::node_data::empty_scalar" (?empty_scalar@node_data@detail@YAML@@2V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@A)
1>UaParser.obj : error LNK2001: unresolved external symbol "public: void __cdecl YAML::detail::memory_holder::merge(class YAML::detail::memory_holder &)" (?merge@memory_holder@detail@YAML@@QEAAXAEAV123@@Z)
1>C:\bmetric\C++ Projects\UA_Parser\x64\Release\UA_Parser.exe : fatal error LNK1120: 16 unresolved externals
1>Done building project "UA_Parser.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

I have a feeling they can be solved by linking, but I am not sure what to link (the precise folder).

So far, I have built the yaml-cpp as described on github. Also, I have added the ..\yaml-cpp\include folder in the Additional Include Directories from Configuration Properties >> C/C++ >> General and tried to include in the Additional Library Directories (Linker) various folders, unsuccessfully.

Never used YAML before. And I don't link stuff often.

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  • You do not link against a folder, but against a library file. Additional Library Directories only tells Visual Studio where to look for the libraries you want to link against. You need to add the library created by compiling yaml-cpp to the linker input. Commented Nov 20, 2017 at 11:07
  • @flyx, please be more precise. Commented Nov 20, 2017 at 11:21
  • 1
    If I knew Visual Studio, I would write an answer instead of just commenting. Commented Nov 20, 2017 at 12:59
  • I have a feeling they can be solved by linking, but I am not sure what to link - You need to link with .lib file. Find this file in the yaml-cpp tree (the file is created during building yaml-cpp project). Then follow regular steps for linking something in Visual Studio. Commented Nov 21, 2017 at 8:29
  • 1
    You need to add libyaml-cppmd.lib to the linker Input and the containing directory to the Additional Library Directories. Commented Nov 24, 2017 at 9:44

1 Answer 1

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I was getting the unresolved external symbols errors because I was including #include <yaml-cpp/node/node.h>, which is what Resharper recommended me(and it's is correct 99.9% of the time). In this case it's a wrong header and what I should have been including is: #include <yaml-cpp/yaml.h>.

I fixed my includes in my files and it built successfully.

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