When developing iOS apps, the QR code library “ZXing” wouldn’t build as-is.

It seems you need to use LLVM C++ during build, so here’s a memo of that setting.

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Steps to Use LLVM C++

In the Pods project, with Pods-ZXing selected:

• Build Settings
• Apple LLVM 5.0 - Language - C++
• C++ Standard Library

Change this item from Compiler Default to libc++ (LLVM C++ standard library with C++ 11 support).

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Reference Information

・XCodeでC++11を使う方法 - 亀岡的プログラマ日記

That’s all from the Gemba.