Unresolved external symbols using tag.lib on Windows 10

[Luca Spiridigliozzi]

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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