Tuesday, November 8, 2011

dyld: Symbol not found: __NSConcreteGlobalBlock

This error occurs in Xcode 4.2 when building for pre iOS 4.0. The fix: Add '-weak_library /usr/lib/libSystem.B.dylib' to Build Settings->Linking->Other Link Flags.
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1 comment:

  1. mikehJanuary 27, 2012 at 7:47 AM

    Also found, If you're using LLVM compiler then switch to the GCC compiler the problem goes away.

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