Xcode 4.1 fatal error: stdlib modified since the precompiled header was built

Question

Building an iPhone app, using:

• Xcode 4.1
• Base SDK iOS 4.3
• Apple LLVM Compiler 2.1

I have started getting the following error

Answer 1

Deleting the DerivedData folder did not work for me when Archiving.

I had to look at Build Settings - Build Locations - Precompiled Header Cache Path and delete that folder.

For me that was:

/var/folders/_w/t0mj70hd1439tqgxff7_mtt00000gn/C/com.apple.Xcode.501/SharedPrecompiledHeaders