本项目中使用的是苹果源码 objc4-781 版本， 系统版本为macos 10.15 ，可以从 苹果开源源码 和 官方tarballs 查看相关源码和依赖库， 所使用的到的依赖库如下：
libdispatch、libpthread、dyld、Libc、libplatform、libauto、libclosure、xnu
以上项目可直接编译使用！如需自己编译，可查看以下步骤！否则可忽略以下步骤！
unable to find sdk 'macosx.internal'
- 将
Build Settings->Base SDK设置为macos 10.15 - 将
Valid Architectures删除i386架构支持
- 在工程目录下新建
Common文件夹 - 之后在
Xcode->Build Setting->Header Search Paths添加$(SRCROOT)/Common - 在
Common文件夹中新建sys文件夹，并从下载的其他的包中找到reason.h，放到sys文件夹中即可 - 以下同理
'sys/reason.h' file not found
'mach-o/dyld_priv.h' file not found
'os/lock_private.h' file not found
'os/base_private.h' file not found
'pthread/tsd_private.h' file not found
'System/machine/cpu_capabilities.h' file not found
'os/tsd.h' file not found
'pthread/spinlock_private.h' file not found
'System/pthread_machdep.h' file not found
'CrashReporterClient.h' file not found
'objc-shared-cache.h' file not found
'_simple.h' file not found
'kern/restartable.h' file not found
'Block_private.h' file not found
'objc/objc-block-trampolines.h' file not found
- 删除
bridgeos(3.0)即可
Use of undeclared identifier 'OS_UNFAIR_LOCK_ADAPTIVE_SPIN'
将此处修改为os_unfair_lock_lock(&mLock);
Use of undeclared identifier 'DYLD_MACOSX_VERSION_10_11'
Use of undeclared identifier 'DYLD_MACOSX_VERSION_10_14'
Use of undeclared identifier 'DYLD_MACOSX_VERSION_10_13'
Use of undeclared identifier 'DYLD_MACOSX_VERSION_10_12'
定义以下宏即可
#define DYLD_MACOSX_VERSION_10_11 0x000A0B00
#define DYLD_MACOSX_VERSION_10_14 0x000A0E00
#define DYLD_MACOSX_VERSION_10_13 0x000A0D00
#define DYLD_MACOSX_VERSION_10_12 0x000A0C00Can't open order file: /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/AppleInternal/OrderFiles/libobjc.order
将 Build Settings - Order file 路径改为 $(SRCROOT)/libobjc.order 即可
ld: library not found for -lCrashReporterClient
将 Build Settings - other link flags 删除 -lCrashReporterClient 即可
/xcodebuild:1:1: SDK "macosx.internal" cannot be located.
/xcrun:1:1: sh -c '/Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -sdk macosx.internal -find clang++ 2> /dev/null' failed with exit code 16384: (null) (errno=No such file or directory)
/xcrun:1:1: unable to find utility "clang++", not a developer tool or in PATH
将 Build Phases - Run Script(markc) 中 macosx.internal 改为 macosx
依赖库图
github 图片不显示配置（亲测可用）
sudo /etc/hosts
将以下内容添加到 hosts 文件即可
140.82.114.3 github.com
199.232.69.194 github.global.ssl.fastly.net
185.199.110.153 assets-cdn.github.com
140.82.114.3 gist.github.com
199.232.28.133 raw.githubusercontent.com
199.232.28.133 gist.githubusercontent.com
199.232.28.133 cloud.githubusercontent.com
199.232.28.133 camo.githubusercontent.com
199.232.28.133 avatars0.githubusercontent.com
199.232.28.133 avatars1.githubusercontent.com
199.232.28.133 avatars2.githubusercontent.com
199.232.28.133 avatars3.githubusercontent.com
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