我正试图编译WebRTC原生堆栈以构建libwebrtc.aar，但不幸的是无法理解出现了什么问题。
系统信息：
Distributor ID: Ubuntu
Description: Ubuntu 18.04.4 LTS
Release: 18.04
Codename: bionic
Java-Version: OpenJDK-8-JDK
Python-Version: Python 2.7.17
我按照Android WebRTC原生开发官方文档提供的完整步骤进行操作。这些步骤无任何中断已经全部完成，每个步骤都花费了一定时间才完成。接下来，我需要安装构建源代码所需的所有依赖项。
./build/install-build-deps.sh
在编译代码之前，我还使用了以下 git 命令来检出特定的分支以进入不同可用的 WebRTC 版本，并列出所有分支。
git branch -r
我在分享最新的Git分支：
我已经尝试了从branch-heads/60到branch-heads/m79的每个git分支，但是在使用编译命令时每个分支都存在不同的问题。我已经尝试了以下两个过程来构建该库：
1- 使用AAR Build工具 (./tools_webrtc/android/build_aar.py)
confu@ubuntu:~/webrtc_android/src$ tools_webrtc/android/build_aar.py
INFO:root:Building: armeabi-v7a
ERROR at //webrtc.gni:591:7: Can't load input file.
absl_include_config,
^------------------
Unable to load:
/home/confu/webrtc_android/src/third_party/abseil-cpp/BUILD.gn
I also checked in the secondary tree for:
/home/confu/webrtc_android/src/build/secondary/third_party/abseil-cpp/BUILD.gn
Traceback (most recent call last):
File "tools_webrtc/android/build_aar.py", line 234, in <module>
sys.exit(main())
File "tools_webrtc/android/build_aar.py", line 230, in main
args.build_dir, args.extra_gn_switches, args.extra_ninja_switches)
File "tools_webrtc/android/build_aar.py", line 210, in BuildAar
extra_ninja_switches)
File "tools_webrtc/android/build_aar.py", line 166, in Build
_RunGN(gn_args_list)
File "tools_webrtc/android/build_aar.py", line 93, in _RunGN
subprocess.check_call(cmd)
File "/usr/lib/python2.7/subprocess.py", line 190, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/usr/bin/python', '/home/confu/webrtc_android/src/third_party/depot_tools/gn.py', 'gen', '/tmp/tmp1JDmHL/armeabi-v7a', '--args=arm_version=7 use_goma=false target_cpu="arm" is_component_build=false is_debug=false rtc_include_tests=false target_os="android"']' returned non-zero exit status 1
2- 使用手动编译 (gn gen out/Debug --args='target_os="android" target_cpu="arm"')
confu@ubuntu:~/webrtc_android/src$ gn gen out/Debug --args='target_os="android" target_cpu="arm64"'
ERROR at //BUILD.gn:648:20: Assignment had no effect.
java_files = [
^
You set the variable "java_files" here and it was unused before it went
out of scope.
See //BUILD.gn:647:5: whence it was called.
junit_binary("android_junit_tests") {
^------------------------------------