https://awhisper.github.io/2018/06/08/libstdc-inxcode10ios12/
a. 将 libstdc++_sim.zip 解压，放到目录
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/
b. 将 libstdc++.dylib_sim.zip 解压，放到目录
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/
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