Xcode10 Xcode11：library not found for -lstdc++.6.0.9 临时解决
临时解决方案：
1.将libstdc++.6.0.9tbd.zip解压，放到以下目录： 链接: https://pan.baidu.com/s/1a43oakMgSyQNnKJMHKtvIA 密码: l0gb
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/
2.将libstdc++_sim.zip解压，放到以下目录：链接: https://pan.baidu.com/s/1OkCUDuYaKLmdPM4Y9hloNA 密码: cvtt
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/
3.将libstdc++.dylib_sim.zip解压，放到目录 链接: https://pan.baidu.com/s/1xGsi20xZMkJwbpacQV-Iew 密码: bgqa
Xcode10:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/
Xcode11/12:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/
参考来源： https://www.jianshu.com/p/ef584a960a0d
