Undefined symbols for architecture armv7: "STD: basic_string Type Error

A series of errors are found when a static library is imported.

Undefined symbols for architecture armv7:

"STD: String: resize (unsigned long, char)", referenced from:

I finally found a lot of articles on the Internet.

Http://stackoverflow.com/questions/12968369/undefined-symbols-for-architecture-armv7-when-using-zxing-library-in-xcode-4-5

This article is available:

Http://blog.csdn.net/kaizi318/article/details/10362673

The two articles are resolved as follows:

Adding libstdc ++. dylib does not solve the problem. It took a few hours to get bored. Finally, right-click the file and choose "Finder" to show it as a substitute for the database. Add libstdc ++. 6.0.9.dylib. Solve the problem.

Undefined symbols for architecture armv7: "STD: basic_string Type Error