最快的临时规避方案：Xcode -> File -> Project Settings -> Build System -> Legacy Build System.
或者 Xcode -> File -> Workspace Setting -> Build System ->(Legacy Build System) -> Done 运行项目即可。
1.点击项目工程：File +Project/Workspace settings
2.Change the build system to Legacy Build system .
二、stdlibc++ headers not found,Xcode10
warning: include path for stdlibc++ headers not found; pass '-std=libc++' on the command line to use the libc++ standard library instead [-Wstdlibcxx-not-found]
Build Setting->C++ Standard Library->libstdc++
修改为
Build Setting->C++ Standard Library->libc++