Build a library which uses libwebrtc sources, and link with it, in final application

[Peter Arnold]

Hi everyone! I have build library RTCSDK link below, qmake file is attached.

This library use a lot of source from webrtc, it inheritate it's headers, multithreading model , and other. 

link: 

https://github.com/ouxianghui/janus-client

As was described, by the owner, he used m96 release, so I swithed to it and build library. I use this flags: 

gn gen out/Default --args='target_os="linux" target_cpu="x64" is_debug=true is_component_build=false rtc_use_h264=true use_rtti=true use_custom_libcxx=false treat_warnings_as_errors=false enable_libaom=true rtc_include_tests=false use_custom_libcxx_for_host=false'

After, I build a library, succesfully, I used it for creation a local application, which linked with my builded library and webrtc second pro file attached with it. 

And when I try to build it , it starts with linkage error, but nm shows me, like this functions are in place:

/usr/bin/ld: /home/user/Desktop/LinuxBuildJanusLibrary/build-RTCSln-Desktop_Qt_5_12_12_GCC_64bit-Debug/x64/Debug/libRTCSDK.a(logger.o): in function `vi::Logger::init()':

/home/user/Desktop/LinuxBuildJanusLibrary/build-RTCSln-Desktop_Qt_5_12_12_GCC_64bit-Debug/RTCSDK/../../janus-client/RTCSDK/logger/logger.cpp:59: undefined reference to `rtc::LogMessage::SetLogToStderr(bool)'

nm:

0000000000000ce0 T rtc::LogMessage::SetLogToStderr(bool)

/usr/bin/ld: /home/user/Desktop/LinuxBuildJanusLibrary/build-RTCSln-Desktop_Qt_5_12_12_GCC_64bit-Debug/RTCSDK/../../janus-client/RTCSDK/logger/logger.cpp:60: undefined reference to `rtc::LogMessage::AddLogToStream(rtc::LogSink*, rtc::LoggingSeverity)'
/usr/bin/ld: /home/user/Desktop/LinuxBuildJanusLibrary/build-RTCSln-Desktop_Qt_5_12_12_GCC_64bit-Debug/x64/Debug/libRTCSDK.a(logger.o): in function `vi::Logger::destroy()':

nm:

0000000000000e40 T rtc::LogMessage::RemoveLogToStream(rtc::LogSink*)

/home/user/Desktop/LinuxBuildJanusLibrary/build-RTCSln-Desktop_Qt_5_12_12_GCC_64bit-Debug/RTCSDK/../../janus-client/RTCSDK/logger/logger.cpp:71: undefined reference to `rtc::LogMessage::RemoveLogToStream(rtc::LogSink*)'

nm:

0000000000000e40 T rtc::LogMessage::RemoveLogToStream(rtc::LogSink*)

/usr/bin/ld: /home/user/Desktop/LinuxBuildJanusLibrary/build-RTCSln-Desktop_Qt_5_12_12_GCC_64bit-Debug/x64/Debug/libRTCSDK.a(logger.o): in function `rtc::LogSink::LogSink()':

/home/user/Desktop/LinuxBuildJanusLibrary/build-RTCSln-Desktop_Qt_5_12_12_GCC_64bit-Debug/RTCSDK/../../janus-client/3rd/webrtc/include/rtc_base/logging.h:112: undefined reference to `vtable for rtc::LogSink'

I checked some source files, for building with included headers, I found them.

So I don't know for now, how it is possible to build this library and my application so it could be linked with webrtc library?