'unresolved external symbol' in Visual Studio 2022

[etkaar]

The example code unfortunately can't be compiled with Visual Studio 2022:

#define TINS_STATIC

#include <iostream>
#include <tins/tins.h>

using namespace Tins;
using namespace std;

bool callback(const PDU& pdu) {
    // Find the IP layer
    const IP& ip = pdu.rfind_pdu<IP>();
    // Find the TCP layer
    const TCP& tcp = pdu.rfind_pdu<TCP>();
    cout << ip.src_addr() << ':' << tcp.sport() << " -> "
        << ip.dst_addr() << ':' << tcp.dport() << endl;
    return true;
}

int main() {
    Sniffer("eth0").sniff_loop(callback);
}

Errors

Severity	Code	Description	Project	File	Line	Suppression State
Error	LNK2019	unresolved external symbol "public: __cdecl Tins::IPv4Address::IPv4Address(unsigned int)" (??0IPv4Address@Tins@@QEAA@I@Z) referenced in function "public: class Tins::IPv4Address __cdecl Tins::IP::dst_addr(void)const " (?dst_addr@IP@Tins@@QEBA?AVIPv4Address@2@XZ)	FooBar	D:\Dev\Visual Studio\repos\FooBar\FooBar.obj	1	
Error	LNK2019	unresolved external symbol "class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl Tins::operator<<(class std::basic_ostream<char,struct std::char_traits<char> > &,class Tins::IPv4Address const &)" (??6Tins@@YAAEAV?$basic_ostream@DU?$char_traits@D@std@@@std@@AEAV12@AEBVIPv4Address@0@@Z) referenced in function "bool __cdecl callback(class Tins::PDU const &)" (?callback@@YA_NAEBVPDU@Tins@@@Z)	FooBar	D:\Dev\Visual Studio\repos\FooBar\FooBar.obj	1	
Error	LNK2019	unresolved external symbol "public: virtual __cdecl Tins::BaseSniffer::~BaseSniffer(void)" (??1BaseSniffer@Tins@@UEAA@XZ) referenced in function "public: virtual __cdecl Tins::Sniffer::~Sniffer(void)" (??1Sniffer@Tins@@UEAA@XZ)	FooBar	D:\Dev\Visual Studio\repos\FooBar\FooBar.obj	1	
Error	LNK2019	unresolved external symbol "public: class Tins::PacketWrapper<class Tins::PDU *,class Tins::Timestamp> __cdecl Tins::BaseSniffer::next_packet(void)" (?next_packet@BaseSniffer@Tins@@QEAA?AV?$PacketWrapper@PEAVPDU@Tins@@VTimestamp@2@@2@XZ) referenced in function "private: void __cdecl Tins::SnifferIterator::advance(void)" (?advance@SnifferIterator@Tins@@AEAAXXZ)	FooBar	D:\Dev\Visual Studio\repos\FooBar\FooBar.obj	1	
Error	LNK2019	unresolved external symbol "public: class Tins::SnifferIterator __cdecl Tins::BaseSniffer::begin(void)" (?begin@BaseSniffer@Tins@@QEAA?AVSnifferIterator@2@XZ) referenced in function "public: void __cdecl Tins::BaseSniffer::sniff_loop<bool (__cdecl*)(class Tins::PDU const &)>(bool (__cdecl*)(class Tins::PDU const &),unsigned int)" (??$sniff_loop@P6A_NAEBVPDU@Tins@@@Z@BaseSniffer@Tins@@QEAAXP6A_NAEBVPDU@1@@ZI@Z)	FooBar	D:\Dev\Visual Studio\repos\FooBar\FooBar.obj	1	
Error	LNK2019	unresolved external symbol "public: class Tins::SnifferIterator __cdecl Tins::BaseSniffer::end(void)" (?end@BaseSniffer@Tins@@QEAA?AVSnifferIterator@2@XZ) referenced in function "public: void __cdecl Tins::BaseSniffer::sniff_loop<bool (__cdecl*)(class Tins::PDU const &)>(bool (__cdecl*)(class Tins::PDU const &),unsigned int)" (??$sniff_loop@P6A_NAEBVPDU@Tins@@@Z@BaseSniffer@Tins@@QEAAXP6A_NAEBVPDU@1@@ZI@Z)	FooBar	D:\Dev\Visual Studio\repos\FooBar\FooBar.obj	1	
Error	LNK2019	unresolved external symbol "public: __cdecl Tins::Sniffer::Sniffer(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (??0Sniffer@Tins@@QEAA@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) referenced in function main	FooBar	D:\Dev\Visual Studio\repos\FooBar\FooBar.obj	1	
Error	LNK1120	7 unresolved externals	FooBar	D:\Dev\Visual Studio\repos\FooBar\x64\Debug\FooBar.exe	1

[WorstCodeWay]

@etkaar Hi, do you solve it? I encounter problem very like this, but the unresolved symbol is Tins::Internals::increment(IPv4Address &)

[etkaar]

No, unfortunately not. I had to use Visual Studio 2015 instead:
https://stackoverflow.com/a/44290942

You will later then be able to still use Visual Studio 2022 by changing the Platform Toolset:

[WorstCodeWay]

No, unfortunately not. I had to use Visual Studio 2015 instead: https://stackoverflow.com/a/44290942

You will later then be able to still use Visual Studio 2022 by changing the Platform Toolset:

It's more likely a different problem, because I have solved mine. I share my solution here, in case it helps some one.

I build my program with cmake and compile with Visual Studio 2019. It's important to add -DCMAKE_WINDOWS_EXPORT_ALL_SYSBOLS=true to cmake parameters when building, which means all symbols of libtins will be exported to tins.dll, and that solves my problem( I had inspected my tins.dll and cannot find definition of Tins::Internals::increment(IPv4Address &), this my situation)

[cweidner3]

I ran across this issue only with compiling using MVSC. Was able to resolve it by adding virtual deconstructors to derived classes that do no have one but the parent class does. In my example it was for Sniffer and FileSniffer.

In the header I added virtual ~Sniffer() {} and virtual ~FileSniffer() {}

Looks like this might also aid in #291