Build WebRTC libjingle_peerconnection_so.so with Libjingle / XMPP Support

[Kyle Cummings]

I have followed the build instructions defined in the android example app (AppRTCDemo) README (https://chromium.googlesource.com/external/webrtc/+/master/talk/examples/android/README), including setting the build flag "build_with_libjingle=1". When I run either "ninja -C out_android/Debug AppRTCDemo" (or the Release version), it compiles everything associated with libjingle. However, when it compiles libjingle_peerconnection_so.so, it seems to forget to include various libjingle static libraries. I can tell this, because when I include the libjingle_peerconnection_so.so file in my own project (that uses things like buzz::QN_MESSAGE and XmlElement objects) the build complains that those (and other things) are not defined. BUT every WebRTC object I have in my code IS defined, and the compiler does not complain. 

I have used nm -C and grep on the libjingle_peerconnection_so.so file, looking for the symbols, and there are NO results returned. However, the libjingle_peerconnection_so.ninja file clearly has the necessary libraries included (librtc_xmpp, etc.). 

For my project, I am using the ndk-build system with .mk files. I have tried ditching the .so file, and instead using EVERY static library in my .mk file, but that then introduces a bunch of other not defined errors that make less sense than using the .so file. 

What the heck am I doing wrong? Or is there something wrong with the build system?

Let me know if you need any more information.

Thanks

[Kyle Cummings]

UPDATE:
Of course, when you visit something the next day, everything changes. Now when I run nm on the libjingle_peerconnection_so.so file, it shows that the functions / symbols are there. However, my build setup still claims that they are not defined, even though they clearly are.

I am also including the .mk file that I am using below.

LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := libjingle_peerconnection_so
cmd-strip :=
LOCAL_SRC_FILES := ../../ThirdPartyLibs/WebRTC/src/out_android/Debug/lib/libjingle_peerconnection_so.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_ARM_MODE := arm
LOCAL_MODULE := kinoproject
LOCAL_MODULE_TAGS := optional
LOCAL_CPP_EXTENSION := .cpp \
 .cc

LOCAL_SRC_FILES := \
 presencepushtask.cc \
 CallItem.cpp \
 KinoVideo.cpp \
 KinoXMPP.cpp \
 KinoJNIMain.cpp

LIBJINGLE_CPPFLAGS := \
 -DHAMMER_TIME=1 \
 -DHAS_OPENSSL_1_0 \
 -DHAVE_DTLS_SRTP \
 -DGTEST_RELATIVE_PATH \
 -DDISABLE_DYNAMIC_CAST \
 -D_REENTRANT \
 -DWEBRTC_POSIX \
 -DOS_LINUX=OS_LINUX \
 -DLINUX \
 -DANDROID \
 -DEXPAT_RELATIVE_PATH \
 -DSRTP_RELATIVE_PATH \
 -DXML_STATIC \
 -DFEATURE_ENABLE_SSL \
 -DHAVE_OPENSSL_SSL_H=1 \
 -DFEATURE_ENABLE_VOICEMAIL \
 -DFEATURE_ENABLE_PSTN \
 -DHAVE_WEBRTC_VIDEO \
 -DHAVE_WEBRTC_VOICE \
 -DHAVE_SRTP \
 -DLOGGING \
 -DNO_SOUND_SYSTEM \
 -DARCH_CPU_LITTLE_ENDIAN \
 -DJSONCPP_RELATIVE_PATH \
 -DWEBRTC_RELATIVE_PATH \
 -D_DEBUG

LOCAL_CFLAGS := \
 $(LIBJINGLE_CPPFLAGS) \
 -O2 \
 -std=c++11 \
 -fexceptions

LOCAL_C_INCLUDES := \
 $(LOCAL_PATH) \
 $(LOCAL_PATH)/../../Libs \
 $(LOCAL_PATH)/../../Libs/Kino \
 $(LOCAL_PATH)/../../Libs/android-logging \
 $(LOCAL_PATH)/../../ThirdPartyLibs/openssl/openssl/include \
 $(LOCAL_PATH)/../../ThirdPartyLibs/WebRTC/src \
 $(LOCAL_PATH)/../../ThirdPartyLibs/WebRTC/src/webrtc \
 $(LOCAL_PATH)/../../ThirdPartyLibs/WebRTC/src/chromium/src/third_party/jsoncpp/source/include \
 $(LOCAL_PATH)/../../ThirdPartyLibs/WebRTC/src/chromium/src/third_party/icu/source/common
 
LOCAL_SHARED_LIBRARIES := \
 libcrypto-mod \
 libssl-mod \
 libjingle_peerconnection_so

LOCAL_LDLIBS := \
 -L$(NDK_PROJECT_PATH)/toolchain/sysroot/usr/lib \
 -llog \
 -lOpenSLES \
 -lGLESv2 \
 -lc \
 -ljnigraphics \
 -ldl
 
include $(BUILD_SHARED_LIBRARY)

[Kyle Cummings]

I have suppressed the undefined errors with

LOCAL_ALLOW_UNDEFINED_SYMBOLS := true

in the .mk file, and that completes the build and created the android .so files in

libs/armeabi-v7a/

When I nm those files, the symbols are found. However, when everything is loaded to the android device, the application crashes, saying that it cannot find (for example) the symbol

_ZN4buzz11QN_PRESENCEE

referenced in my library (myproject.so). The nm results:

nm libs/armeabi-v7a/libkinoproject.so | grep QN_PRESENCE
4983: U _ZN4buzz10QN_PRESENCEE

nm libs/armeabi-v7a/libjingle_peerconnection_so.so | grep QN_PRESENCE
100840:005f65f8 d _ZN4buzz11QN_PRESENCEE

On Friday, May 8, 2015 at 9:51:02 AM UTC-6, Kyle Cummings wrote: