心心念念查看了下objc4源码 https://opensource.apple.com/releases/ ，果然更新了，果断编译调试

如果想最省时省力，直接 github 下载可编译源码

下面开始配置可编译环境（本次配置为M1）

首先确保下载到841.13源码

首先编译target objc

1. unable to find sdk 'macosx.internal'

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• PROJECTS –> objc –> Build Settings, 将 Base SDK 改成 macOS
• TARGETS –> objc –> Build Settings, 将 Base SDK 改成 macOS

2. 'sys/reson.h' file not found

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• 下载xnu-8020.101.4, 把 xnu-8020.101.4/bsd/sys/reason.h 文件复制到 comm_ifl/sys 目录下

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• 设置头文件搜索路径：TARGETS –> objc –> Build Settings –> Header Search Paths, 添加一条 $(SRCROOT)/comm_ifl

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3. 'mach-o/dyld_priv.h' file not found

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• 下载 dyld-955, 把 dyld-955/include/mach-o/dyld_priv.h 拷贝到 comm_ifl/mach-o/dyld_priv.h

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4. 'os/lock_private.h' file not found

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• 下载 libplatform-273.100.5， 把 libplatform-273.100.5/private/os/lock_private.h 拷贝到 comm_ifl/os/lock_private.h

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5. extern dyld_platform_t dyld_get_active_platform(void) __API_AVAILABLE(macos(10.14), ios(12.0), watchos(5.0), tvos(12.0), bridgeos(3.0)); ---- 报错 Expected ','

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• 由于调试主要基于macos，删除, bridgeos(3.0)

6. 批量同5

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• 同样均删除掉 , bridgeos(3.0)

7. 'os/base_private.h' file not found

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• 下载源码（macOS Catalina 10.15 - macOS 10.15.6）libplatform-220.100.1, 把 libplatform-220.100.1/private/os/base_private 拷贝到 comm_ifl/os/base_private.h

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8. 'pthread/tsd_private.h' file not found

• 下载 libpthread-libpthread-486.100.11 libpthread-libpthread-486.100.11/private/pthread/tsd_private.h 拷贝到 comm_ifl/pthread/tsd_private.h

9. 'System/machine/cpu_capabilities.h' file not found

• xnu-xnu-8020.101.4/osfmk/machine/cpu_capabilities.h 拷贝到 comm_ifl/System/machine/cpu_capabilities.h

10. 'os/feature_private.h' file not found

• 注释掉

11. 'os/variant_private.h' file not found

• google搜索 os/variant_private.h opensource.apple.com

  得到结果 https://opensource.apple.com/source/Libc/Libc-1244.50.9/os/variant_private.h.auto.html 根据路径找文件

• 拷贝 Libc-Libc-1507.100.9/os/variant_private.h 至 comm_ifl/os/variant_private.h

12. 'os/tsd.h' file not found

• 拷贝 xnu-xnu-8020.101.4/libsyscall/os/tsd.h 至 comm_ifl/os/tsd.h

13. 'pthread/spinlock_private.h' file not found

• 拷贝 libpthread-libpthread-486.100.11/private/pthread/spinlock_private.h 至 comm_ifl/pthread/spinlock_private.h

14. 'System/pthread_machdep.h' file not found

• 拷贝 Libc-825.24/pthreads/pthread_machdep.h 至 comm_ifl/System/pthread_machdep.h

15. bridgeos(4.0) 问题

• 去除

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16. 'CrashReporterClient.h' file not found

• 拷贝 Libc-825.24/include/CrashReporterClient.h 至 comm_ifl/CrashReporterClient.h

17. Typedef redefinition with different types ('int' vs 'volatile OSSpinLock' (aka 'volatile int'))

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• 注释掉

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18. Use of undeclared identifier 'dyld_platform_version_macOS_10_13'

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• 注释

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19. 'os/bsd.h' file not found

• 注释

20. 'os/reason_private.h' file not found

• 拷贝 xnu-xnu-8020.101.4/libkern/os/reason_private.h 至 comm_ifl/os/reason_private.h

21. 'objc-shared-cache.h' file not found

• 拷贝 dyld-dyld-955/include/objc-shared-cache.h 至 comm_ifl/objc-shared-cache.h

22. 'os/linker_set.h' file not found

• 拷贝 Libc-Libc-1507.100.9/os/linker_set.h 至 comm_ifl/os/linker_set.h

23. '_simple.h' file not found

• 拷贝 Libc-825.24/gen/_simple.h 至 comm_ifl/_simple.h

24. dyld_program_sdk_at_least(dyld_fall_2020_os_versions)

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• 注释掉

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25. Use of undeclared identifier 'objc4'

• 注释掉

26. Use of undeclared identifier 'CRGetCrashLogMessage'

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27. 'Cambria/Traps.h Cambria/Cambria.h' file not found

• 注释

28. 'kern/restartable.h' file not found

• xnu-xnu-8020.101.4/osfmk/kern/restartable.h 拷贝到 comm_ifl/kern/restartable.h

29. Use of undeclared identifier 'oah_is_current_process_translated'

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30. Block_private.h

• libclosure-libclosure-79.1/Block_private.h 拷贝到 comm_ifl/Block_private.h

31. Use of undeclared identifier 'os_parse_boot_arg_string'

• 注释掉

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32. Use of undeclared identifier 'dyld_platform_version_macOS_10_11'

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33. Use of undeclared identifier 'dyld_fall_2018_os_versions'

• 注释掉

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34. Use of undeclared identifier 'dyld_platform_version_macOS_10_12'

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35. '_static_assert' declared as an array with a negative size

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• 注释

在 dyld_priv.h 文件顶部加入宏

#define DYLD_MACOSX_VERSION_10_11 0x000A0B00
#define DYLD_MACOSX_VERSION_10_12 0x000A0C00
#define DYLD_MACOSX_VERSION_10_13 0x000A0D00
#define DYLD_MACOSX_VERSION_10_14 0x000A0E00

CrashReporterClient异常

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配置脚本

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ld -loah报错

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objc编译成功

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接下来objc进行编译调试

• 新建target

  
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• 建立依赖

  
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编译调试target

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• 下符号 alloc调试

  
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进入源码 alloc

坚持到这一步，M1 objc调试环境OK，就恭喜了