webrtc::StatsCollector::GetReport missing

[amitu]

I am getting this error when I am building it using cgo.

Undefined symbols for architecture x86_64:
  "webrtc::StatsCollector::GetReport(std::string const&, std::string const&, webrtc::StatsCollector::TrackDirection)", referenced from:
      webrtc::StatsCollector::GetOrCreateReport(std::string const&, std::string const&, webrtc::StatsCollector::TrackDirection) in libjingle_peerconnection.statscollector.o

I am quite confused. I see GetReport being declared and called, but can not find where is it defined.

Here is a bit more details in log:

# github.com/amitu/webrtc
Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin14.3.0
Thread model: posix
 "/Applications/Xcode-6.1.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld" -demangle -dynamic -arch x86_64 -macosx_version_min 10.10.0 -o $WORK/github.com/amitu/webrtc/_obj/_cgo_.o $WORK/github.com/amitu/webrtc/_obj/_cgo_main.o $WORK/github.com/amitu/webrtc/_obj/_cgo_export.o $WORK/github.com/amitu/webrtc/_obj/webrtc.cgo2.o $WORK/github.com/amitu/webrtc/_obj/webrtc.cc.o -lobjc -framework Cocoa -framework Security -framework IOKit -framework AppKit -framework QTKit ../t/../libwebrtc/out/Release/libjingle_media.a ../t/../libwebrtc/out/Release/libjingle_p2p.a ../t/../libwebrtc/out/Release/libjingle_peerconnection.a ../t/../libwebrtc/out/Release/librtc_p2p.a ../t/../libwebrtc/out/Release/librtc_base.a ../t/../libwebrtc/out/Release/librtc_base_approved.a ../t/../libwebrtc/out/Release/libusrsctplib.a ../t/../libwebrtc/out/Release/libsrtp.a ../t/../libwebrtc/out/Release/libboringssl.a ../t/../libwebrtc/out/Release/libexpat.a ../t/../libwebrtc/out/Release/libfield_trial_default.a ../t/../libwebrtc/out/Release/libjsoncpp.a ../t/../libwebrtc/out/Release/libmetrics_default.a ../t/../libwebrtc/out/Release/librtc_xmllite.a ../t/../libwebrtc/out/Release/librtc_xmpp.a ../t/../libwebrtc/out/Release/libsystem_wrappers.a ../t/../libwebrtc/out/Release/libusrsctplib.a ../t/../libwebrtc/out/Release/libwebrtc_common.a ../t/../libwebrtc/out/Release/obj/talk/app/webrtc/libjingle_peerconnection.statscollector.o -lstdc++ -lSystem /Applications/Xcode-6.1.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/6.0/lib/darwin/libclang_rt.osx.a
Undefined symbols for architecture x86_64:
  "webrtc::StatsCollector::GetReport(std::string const&, std::string const&, webrtc::StatsCollector::TrackDirection)", referenced from:
      webrtc::StatsCollector::GetOrCreateReport(std::string const&, std::string const&, webrtc::StatsCollector::TrackDirection) in libjingle_peerconnection.statscollector.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

[pigeek]

@amitu Have you found a solution to the reported issue?

I have the same issue when I am trying to compile and link libwebrtc as a part of nodejs source. I have tried to add node-webrtc source to be compiled as a native module in nodejs. It passed the compilation, however it fails in a link phase with the following errors (just a few of them):

Undefined symbols for architecture x86_64:
  "webrtc::StatsCollector::GetReport(std::string const&, std::string const&, webrtc::StatsCollector::TrackDirection)", referenced from:
      webrtc::StatsCollector::GetOrCreateReport(std::string const&, std::string const&, webrtc::StatsCollector::TrackDirection) in libjingle_peerconnection.a(libjingle_peerconnection.statscollector.o)
  "cricket::BaseChannel::AddRecvStream(cricket::StreamParams const&)", referenced from:
      webrtc::WebRtcSession::AddSctpDataStream(int) in libjingle_peerconnection.a(libjingle_peerconnection.webrtcsession.o)
  "cricket::BaseChannel::AddSendStream(cricket::StreamParams const&)", referenced from:
      webrtc::WebRtcSession::AddSctpDataStream(int) in libjingle_peerconnection.a(libjingle_peerconnection.webrtcsession.o)
  "cricket::BaseChannel::RemoveRecvStream(unsigned int)", referenced from:
      webrtc::WebRtcSession::RemoveSctpDataStream(int) in libjingle_peerconnection.a(libjingle_peerconnection.webrtcsession.o)
  "cricket::BaseChannel::RemoveSendStream(unsigned int)", referenced from:
      webrtc::WebRtcSession::RemoveSctpDataStream(int) in libjingle_peerconnection.a(libjingle_peerconnection.webrtcsession.o)

I checked how it’s done in node_webrtc and it looks that it’s using ‘-undefined dynamic_lookup’ switch. However, when I tried to add this switch, link was successful, but then on the first attempt to execute the program I got the following error:

dyld: Symbol not found: __ZN7cricket22kMediaProtocolDtlsSctpE
  Referenced from: path/to/node
  Expected in: dynamic lookup

[gtlbupt]

Mac OS X change clang c++ standard lib from libstdc++ to libc++. When you compile node-webrtc with -stdlib=libstdc++ or -stdlib=libc++, clang may generate different function signature. This is part of my binding.gyp file , may be help.
'xcode_settings': {
'MACOSX_DEPLOYMENT_TARGET': '10.6',
'OTHER_CFLAGS': [
'-std=c++11',
'-stdlib=libstdc++',
'-fexceptions',
'-pipe',
'-fno-ident',
'-fdata-sections',
'-ffunction-sections',
'-fPIC',
'-fpermissive',
]
},

[pigeek]

@gtlbupt Thanks for the suggestion, but it didn't help.

Actually what I don't understand is why it passes link when it's compiled as a part of node-webrtc and it doesn't when it's included in nodejs source. I am using exactly the same .cc sources from node-wrtc moved into nodejs environment and I have copied all the flags/defines from binding.gyp.

Another issue is the original question by @amitu: where GetReport is defined? Since I don't see it defined in the code, I would expect it to fail in both cases (as a part of node-wrtc and as a part of nodejs). Looks like I am missing something.

[pigeek]

I am still not sure why it didn't work on Mac, but on Linux I was able to pass the link with the following directive

'-Wl,--unresolved-symbols=ignore-in-object-files'

It looks that the missing symbols are not really in use, so probably the clean way is to stub them. But for now it works well as it is.