Unresolved external symbols using tag.lib on Windows 10

[Luca Spiridigliozzi]

I've tested this using two different PC's getting the same results.

On Sat, Oct 10, 2020 at 8:28 AM Luca Spiridigliozzi <spiri.luca96 at gmail.com>
wrote:

> Hello,
>
> I have troubles getting an example work on Windows 10.
>
> I built the library with `cmake CMakeLists.txt` + `msbuild
> INSTALL.vcxproj` with x86_64 command prompt of Visual Studio.
>
> Build files got installed under `C:\Program Files (x86)` although I
> examined the lib using dumpbin.exe and found it's 64-bit.
>
> Also I know there shouldn't be any space in the library path, but this
> does not seem to be the problem when building with Visual Studio.
>
> So I setup a project in Visual Studio, added all the necessary information
> to the project (Include-Dir, Lib-Dir + Lib) and then I build the project
> without success.
>
> I'm getting unresolved external symbol errors as if the Lib got not
> linked. But it is:
>
> 1>    C:\Program Files (x86)\Microsoft Visual
> Studio\2019\Community\VC\Tools\MSVC\14.27.29110\bin\HostX86\x64\link.exe
> /ERRORREPORT:PROMPT
> /OUT:"C:\Users\\eigenartig\source\repos\exercise\x64\Debug\exercise.exe"
> /INCREMENTAL /NOLOGO tag.lib kernel32.lib user32.lib gdi32.lib winspool.lib
> comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib
> odbc32.lib odbccp32.lib /MANIFEST /MANIFESTUAC:"level='asInvoker'
> uiAccess='false'" /manifest:embed /DEBUG:FASTLINK
> /PDB:"C:\Users\\eigenartig\source\repos\exercise\x64\Debug\exercise.pdb"
> /SUBSYSTEM:CONSOLE /TLBID:1 /DYNAMICBASE /NXCOMPAT
> /IMPLIB:"C:\Users\\eigenartig\source\repos\exercise\x64\Debug\exercise.lib"
> /MACHINE:X64 x64\Debug\main.obj
>
> Building with 32-bit gives me architecture mismatch warnings.
>
> I found this behavior on both TagLib 1.11 and TagLib 1.11.1 releases and
> I'm getting unresolved external symbols for everything, not just for
> TagLib::String.
>
> I tried two build systems, MSVC and Qt.
>
> Can you help me making this work?
>
> 1>------ Build started: Project: exercise, Configuration: Debug x64 ------
> 1>main.cpp
> 1>C:\Program Files (x86)\taglib\include\taglib\tiostream.h(53,30): warning
> C4251: 'TagLib::FileName::m_name': class
> 'std::basic_string<char,std::char_traits<char>,std::allocator<char>>' needs
> to have dll-interface to be used by clients of class 'TagLib::FileName'
> 1>D:\Program Files (x86)\Microsoft Visual
> Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\xstring(4564):
> message : see declaration of
> 'std::basic_string<char,std::char_traits<char>,std::allocator<char>>'
> 1>C:\Program Files (x86)\taglib\include\taglib\tiostream.h(54,31): warning
> C4251: 'TagLib::FileName::m_wname': class
> 'std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t>>'
> needs to have dll-interface to be used by clients of class
> 'TagLib::FileName'
> 1>D:\Program Files (x86)\Microsoft Visual
> Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\xstring(4565):
> message : see declaration of
> 'std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t>>'
> 1>main.obj : error LNK2019: unresolved external symbol
> "__declspec(dllimport) public: __cdecl TagLib::String::String(char const
> *,enum TagLib::String::Type)" (__imp_??0String at TagLib@@QEAA at PEBDW4Type@01@@Z)
> referenced in function main
> 1>main.obj : error LNK2019: unresolved external symbol
> "__declspec(dllimport) public: virtual __cdecl
> TagLib::String::~String(void)" (__imp_??1String at TagLib@@UEAA at XZ)
> referenced in function main
> 1>main.obj : error LNK2019: unresolved external symbol
> "__declspec(dllimport) public: __cdecl TagLib::FileRef::FileRef(void)"
> (__imp_??0FileRef at TagLib@@QEAA at XZ) referenced in function main
> 1>main.obj : error LNK2019: unresolved external symbol
> "__declspec(dllimport) public: virtual __cdecl
> TagLib::FileRef::~FileRef(void)" (__imp_??1FileRef at TagLib@@UEAA at XZ)
> referenced in function main
> 1>C:\Users\eigenartig\source\repos\exercise\x64\Debug\exercise.exe : fatal
> error LNK1120: 4 unresolved externals
> 1>Done building project "exercise.vcxproj" -- FAILED.
> ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
>
> Trying to successfully compile the following code:
>
> #include <taglib/taglib.h>
> #include <taglib/tstring.h>
>
> int main() {
> TagLib::String string("hello");
> }
>
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