前言
最近对 WebRTC IOS 端源码进行了下载和编译，网上针对 WebRTC iOS 端的编译文章基本都是几年前的，有些地方已经不适用于最新版的 WebRTC 的编译，简单记录下载&编译的过程，以 M93 版本为例。
编译环境
硬件：macBook Pro (Retina, 15-inch, Mid 2015)
系统：macOS Big Sur 11.5
安装 depot_tools
- depot_tools 是一套 google 用来编译 Chromium 或者 WebRTC 的构建工具，获取 depot_tools 源码前，需开启 VPN 服务。
```
$ mkdir webrtc
$ git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
```
如果出现如下错误，首先检查 VPN 是否连接成功，其次配置 macOS 终端代理
配置终端代理
在开启的 VPN 客户端偏好设置中配置信息如下：
注意：配置终端代理只对当前终端有用，重启后需要重新配置
```
$ export http_proxy=http://127.0.0.1:10887
$ export https_proxy=http://127.0.0.1:10887
$ export all_proxy=http://127.0.0.1:10887
```
配置环境变量
```
$ echo "export PATH=$PWD/depot_tools:$PATH" > $HOME/.bash_profile
$ source $HOME/.bash_profile
```
检查是否配置成功
```
$ echo $PATH
```
安装 ninja
ninja 是 WebRTC 的编译工具。
```
$ git clone git://github.com/martine/ninja.git
$ cd ninja/
$ ./bootstrap.py
```
复制到系统目录（也可配置坏境变量）
```
$ sudo cp ninja /usr/local/bin/
$ sudo chmod a+rx /usr/local/bin/ninja
```
下载 WebRTC 源码
设置要编译的平台到环境变量
```
$ export GYP_DEFINES="OS=ios"
```
下载源码
```
$ fetch --nohooks webrtc_ios
```
指定分支（以 M93版本为例）
```
$ gclient sync -r 25e3fd53a79bfdb2bd647ee3a199eb9c3a71d271
```
分支版本可以在[Release Notes](
https://github.com/webrtc/webrtc-org/blob/gh-pages/release-notes/index.md)中查找，目前最新的是M95版本。
编译 WebRTC 源码
iOS 版本我们可以使用源码中自带的编译脚本，目录如下，不同的 WebRTC 版本路径可能不一样，脚本可根据需求自行配置。
```
$ cd /Users/a1/Desktop/webrtc/src
$ /Users/a1/Desktop/webrtc/src/tools_webrtc/ios/build_ios_libs.py
```
编译完成后可在 src/out_ios_libs 目录下找到WebRTC.framework
生成 Example 并运行
```
$ gn gen out/ios --args='target_os="ios" target_cpu="arm64" is_component_build=false ios_enable_code_signing=false' --ide=xcode
```
下载&编译操作源码
```
Last login: Tue Sep 14 12:49:30 on ttys001
The default interactive shell is now zsh.
To update your account to use zsh, please run `chsh -s /bin/zsh`.
For more details, please visit https://support.Apple.com/kb/HT208050.
yushengzhudeMacBook-Pro:~ a1$ cd /Users/a1/Desktop/webrtc
$ ls
depot_tools
$ export PATH=$PATH:"/Users/a1/Desktop/webrtc/depot_tools"
$ export http_proxy=http://127.0.0.1:10887
$ export https_proxy=http://127.0.0.1:10887
$ export all_proxy=http://127.0.0.1:10887
$ export GYP_DEFINES="OS=ios"
$ fetch --nohooks webrtc_ios
Running: gclient root
WARNING: Your metrics.cfg file was invalid or nonexistent. A new one will be created.
Running: gclient config --spec 'solutions = [
{
"name": "src",
"url": "https://webrtc.googlesource.com/src.git",
"deps_file": "DEPS",
"managed": False,
"custom_deps": {},
},
]
target_os = ["ios"]
'
Running: gclient sync --nohooks --with_branch_heads
________ running 'git -c core.deltaBaseCacheLimit=2g clone --no-checkout --progress https://webrtc.googlesource.com/src.git /Users/a1/Desktop/webrtc/_gclient_src_mgr39v0v' in '/Users/a1/Desktop/webrtc'
Cloning into '/Users/a1/Desktop/webrtc/_gclient_src_mgr39v0v'...
remote: Sending approximately 332.17 MiB ...
remote: Counting objects: 75, done
remote: Finding sources: 100% (75/75)
remote: Total 388264 (delta 284781), reused 388243 (delta 284781)
Receiving objects: 100% (388264/388264), 332.12 MiB | 5.96 MiB/s, done.
Resolving deltas: 100% (284781/284781), done.
[0:01:50] Still working on:
[0:01:50] src
1>Syncing projects: 0% ( 0/ 2)
[0:01:55] Still working on:
[0:01:55] src
Syncing projects: 26% (11/42) src/ios
[0:04:39] Still working on:
[0:04:39] src/third_party
[0:04:39] src/tools
[0:08:52] Still working on:
[0:08:52] src/third_party
[0:08:52] src/tools
Syncing projects: 38% (16/42) src/tools/luci-go:infra/tools/luci/swarming/${pla
[0:09:52] Still working on:
[0:09:52] src/third_party
...
[0:24:17] Still working on:
[0:24:17] src/third_party
Syncing projects: 100% (42/42), done.
Running: git submodule foreach 'git config -f $toplevel/.git/config submodule.$name.ignore all'
Running: git config --add remote.origin.fetch '+refs/tags/*:refs/tags/*'
Running: git config diff.ignoreSubmodules all
$ gclient sync
Syncing projects: 100% (42/42), done.
Running hooks: 41% (10/24) mac_toolchain
________ running 'vPython/ target=_blank class=infotextkey>Python src/build/mac_toolchain.py' in '/Users/a1/Desktop/webrtc'
Skipping Mac toolchain installation for mac
Running hooks: 45% (11/24) clang
________ running 'vpython src/tools/clang/scripts/update.py' in '/Users/a1/Desktop/webrtc'
Downloading https://commondatastorage.googleapis.com/chromium-browser-clang/Mac/clang-llvmorg-14-init-2175-g945cde8b-1.tgz .......... Done.
Downloading https://commondatastorage.googleapis.com/chromium-browser-clang/Mac/clang-llvmorg-14-init-2175-g945cde8b-1.tgz .......... Done.
Hook 'vpython src/tools/clang/scripts/update.py' took 30.90 secs
Running hooks: 58% (14/24) clang_format_mac
________ running 'download_from_google_storage --no_resume --platform=darwin --no_auth --bucket chromium-clang-format -s src/buildtools/mac/clang-format.sha1' in '/Users/a1/Desktop/webrtc'
NOTICE: You have PROXY values set in your environment, but gsutilin depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environmentvariable from being used.
To use a proxy in this situation, please supply those settingsin a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environmentvariable.
0> Downloading src/buildtools/mac/clang-format@5ba974b3b37f9f4e3b44fdde11d7ef2ab71619ab...
Downloading 1 files took 25.228423 second(s)
Hook 'download_from_google_storage --no_resume --platform=darwin --no_auth --bucket chromium-clang-format -s src/buildtools/mac/clang-format.sha1' took 25.33 secs
Running hooks: 79% (19/24) test_fonts
________ running 'download_from_google_storage --no_resume --extract --no_auth --bucket chromium-fonts -s src/third_party/test_fonts/test_fonts.tar.gz.sha1' in '/Users/a1/Desktop/webrtc'
NOTICE: You have PROXY values set in your environment, but gsutilin depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environmentvariable from being used.
To use a proxy in this situation, please supply those settingsin a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environmentvariable.
0> Downloading src/third_party/test_fonts/test_fonts.tar.gz@cd96fc55dc243f6c6f4cb63ad117cad6cd48dceb...
0> Extracting 33 entries from src/third_party/test_fonts/test_fonts.tar.gz to src/third_party/test_fonts/test_fonts
Downloading 1 files took 25.751998 second(s)
Hook 'download_from_google_storage --no_resume --extract --no_auth --bucket chromium-fonts -s src/third_party/test_fonts/test_fonts.tar.gz.sha1' took 25.84 secs
Running hooks: 91% (22/24)
________ running 'download_from_google_storage --directory --recursive --num_threads=10 --no_auth --quiet --bucket chromium-webrtc-resources src/resources' in '/Users/a1/Desktop/webrtc'
NOTICE: You have PROXY values set in your environment, but gsutilin depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environmentvariable from being used.
To use a proxy in this situation, please supply those settingsin a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environmentvariable.
Hook 'download_from_google_storage --directory --recursive --num_threads=10 --no_auth --quiet --bucket chromium-webrtc-resources src/resources' took 1268.21 secs
Hook 'vpython src/testing/generate_location_tags.py --out src/testing/location_tags.json' took 34.77 secs
Running hooks: 100% (24/24), done.
$ gclient sync -r 25e3fd53a79bfdb2bd647ee3a199eb9c3a71d271
Syncing projects: 100% (43/43), done.
Running hooks: 41% (10/24) mac_toolchain
________ running 'vpython src/build/mac_toolchain.py' in '/Users/a1/Desktop/webrtc'
Skipping Mac toolchain installation for mac
Running hooks: 45% (11/24) clang
________ running 'vpython src/tools/clang/scripts/update.py' in '/Users/a1/Desktop/webrtc'
Downloading https://commondatastorage.googleapis.com/chromium-browser-clang/Mac/clang-llvmorg-13-init-14732-g8a7b5ebf-2.tgz .......... Done.
Downloading https://commondatastorage.googleapis.com/chromium-browser-clang/Mac/clang-llvmorg-13-init-14732-g8a7b5ebf-2.tgz .......... Done.
Hook 'vpython src/tools/clang/scripts/update.py' took 31.97 secs
Running hooks: 58% (14/24) clang_format_mac
________ running 'download_from_google_storage --no_resume --platform=darwin --no_auth --bucket chromium-clang-format -s src/buildtools/mac/clang-format.sha1' in '/Users/a1/Desktop/webrtc'
NOTICE: You have PROXY values set in your environment, but gsutilin depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environmentvariable from being used.
To use a proxy in this situation, please supply those settingsin a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environmentvariable.
Running hooks: 79% (19/24) test_fonts
________ running 'download_from_google_storage --no_resume --extract --no_auth --bucket chromium-fonts -s src/third_party/test_fonts/test_fonts.tar.gz.sha1' in '/Users/a1/Desktop/webrtc'
NOTICE: You have PROXY values set in your environment, but gsutilin depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environmentvariable from being used.
To use a proxy in this situation, please supply those settingsin a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environmentvariable.
Running hooks: 91% (22/24)
________ running 'download_from_google_storage --directory --recursive --num_threads=10 --no_auth --quiet --bucket chromium-webrtc-resources src/resources' in '/Users/a1/Desktop/webrtc'
NOTICE: You have PROXY values set in your environment, but gsutilin depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environmentvariable from being used.
To use a proxy in this situation, please supply those settingsin a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environmentvariable.
Hook 'vpython src/testing/generate_location_tags.py --out src/testing/location_tags.json' took 35.13 secs
Running hooks: 100% (24/24), done.
```
