Xcode12.5 安装 libstdc++.dylib 后， fishhook.c 的106行报“Thread 1: EXC_BAD_ACCESS (code=2, address=0x1f5a926c0)”

[KiddoLin]

【环境】Mac 11.3.1, Xcode 12.5

【背景】APP在iOS 13.* 是正常的，在iOS 14.5出现闪退。为了调试iOS14，把Mac 10.15升级到了11.3.1，进而把Xcode 11升级到12.5。
刚开始报 “file not found: /usr/lib/libstdc++.dyli” ，按照 #279 中的办法安装了libstdc++。

【问题】安装 libstdc++.dylib 后，一直报“Undefined symbol: _rebind_symbols”。

【报错内容】
Ld /Users/kid/Library/Developer/Xcode/DerivedData/hall-aivasnrkxxvnaraxpywfikmgypef/Build/Intermediates.noindex/hall.build/Debug-iphoneos/hallDylib.build/Objects-normal/armv7/Binary/libhallDylib.dylib normal armv7 (in target 'hallDylib' from project 'hall')
cd /Users/kid/data/hall
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -target armv7-apple-ios8.0 -dynamiclib -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.5.sdk -L/Users/kid/Library/Developer/Xcode/DerivedData/hall-aivasnrkxxvnaraxpywfikmgypef/Build/Products/Debug-iphoneos -L/opt/MonkeyDev/Frameworks -L/opt/theos/vendor/lib -L/opt/theos/vendor/lib/Alderis.framework -L/opt/theos/vendor/lib/Cephei.framework -L/opt/theos/vendor/lib/CepheiPrefs.framework -L/opt/theos/vendor/lib/CepheiUI.framework -L/opt/theos/vendor/lib/Cycript.framework -L/opt/theos/vendor/lib/CydiaSubstrate.framework -L/opt/theos/vendor/lib/Opener.framework -L/opt/theos/vendor/lib/TechSupport.framework -L/opt/theos/vendor/lib/Alderis.framework/Headers -L/opt/theos/vendor/lib/Alderis.framework/Modules -L/opt/theos/vendor/lib/Cephei.framework/Headers -L/opt/theos/vendor/lib/CepheiPrefs.framework/Headers -L/opt/theos/vendor/lib/CepheiUI.framework/Headers -L/opt/theos/vendor/lib/Cycript.framework/Headers -L/opt/theos/vendor/lib/CydiaSubstrate.framework/Headers -L/opt/theos/vendor/lib/Opener.framework/Headers -L/opt/theos/vendor/lib/TechSupport.framework/Headers -L/opt/theos/vendor/lib/Alderis.framework/Modules/Alderis.swiftmodule -F/Users/kid/Library/Developer/Xcode/DerivedData/hall-aivasnrkxxvnaraxpywfikmgypef/Build/Products/Debug-iphoneos -F/opt/MonkeyDev/Frameworks -F/opt/MonkeyDev/Frameworks/RevealServer.framework -F/opt/MonkeyDev/Frameworks/RevealServer.framework/Headers -F/opt/MonkeyDev/Frameworks/RevealServer.framework/Modules -F/opt/MonkeyDev/Frameworks/RevealServer.framework/Scripts -F/opt/MonkeyDev/Frameworks/RevealServer.framework/_CodeSignature -F/opt/MonkeyDev/Librarys -F/opt/theos/vendor/lib -filelist /Users/kid/Library/Developer/Xcode/DerivedData/hall-aivasnrkxxvnaraxpywfikmgypef/Build/Intermediates.noindex/hall.build/Debug-iphoneos/hallDylib.build/Objects-normal/armv7/hallDylib.LinkFileList -install_name @executable_path/Frameworks/libhallDylib.dylib/libhallDylib.dylib -Xlinker -rpath -Xlinker @executable_path/Frameworks -dead_strip -Xlinker -object_path_lto -Xlinker /Users/kid/Library/Developer/Xcode/DerivedData/hall-aivasnrkxxvnaraxpywfikmgypef/Build/Intermediates.noindex/hall.build/Debug-iphoneos/hallDylib.build/Objects-normal/armv7/hallDylib_lto.o -Xlinker -export_dynamic -Xlinker -no_deduplicate -stdlib=libc++ -fobjc-arc -fobjc-link-runtime -weak_library /usr/lib/libc++.dylib -weak_library /usr/lib/libstdc++.dylib -weak_library /opt/MonkeyDev/Frameworks/libsubstrate.dylib -lcycript -framework RevealServer -framework JavaScriptCore -framework UIKit -framework Foundation -Xlinker -no_adhoc_codesign -compatibility_version 1 -current_version 1 -Xlinker -dependency_info -Xlinker /Users/kid/Library/Developer/Xcode/DerivedData/hall-aivasnrkxxvnaraxpywfikmgypef/Build/Intermediates.noindex/hall.build/Debug-iphoneos/hallDylib.build/Objects-normal/armv7/hallDylib_dependency_info.dat -o /Users/kid/Library/Developer/Xcode/DerivedData/hall-aivasnrkxxvnaraxpywfikmgypef/Build/Intermediates.noindex/hall.build/Debug-iphoneos/hallDylib.build/Objects-normal/armv7/Binary/libhallDylib.dylib

Undefined symbols for architecture armv7:
"_rebind_symbols", referenced from:
_entry in AntiAntiDebug.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Undefined symbol: _rebind_symbols

【尝试解决】
参照 #282 把Xcode12卸载，重装，仍无法解决。但本地没有 Specifications 目录

请问这该怎么解决呢？感谢大佬解答。

[KiddoLin]

【后续】 我把自己的hook代码全部去掉（在AntiAntiDebug.m中），发现可以 build succeeded 了，但是运行时 fishhook.c 的 106 行 indirect_symbol_bindings[i] = cur->rebindings[j].replacement; 报 “Thread 1: EXC_BAD_ACCESS (code=2, address=0x1f5a926c0)”

备注：Xcode的log可以输出
🎉!!！congratulations!!！🎉
👍----------------insert dylib success----------------👍
2021-05-16 19:36:36.036667+0800 hall[6261:1984580] [AntiAntiDebug Init]
(lldb)

[KiddoLin]

【已解决】重新创建 project ，并把 AntiAntiDebug.m 中 _rebind_symbols 注释掉。

[lsqgithub001]

我照着你的重新创建project，注释掉rebind——symbols 还是出一样的错误，知道怎么解决吗