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duplicate symbol _OBJC_IVAR_$_BLoginViewController._hud in: 17 duplicate symbols for architecture x86_64. "Means that you have loaded same functions twice. As the issue disappear after removing -ObjC from Other Linker Flags, this means that this option result that functions loads twice:"
Duplicate symbols occur when you have both added an implementation file (. cpp) to your project and #included it. This way, the implementation file (. cpp) gets compiled twice: once as a module in your project (as it is added to your project) and subsequently as a piece of #included code.
Why Is the Undefined Symbols for Architecture x86_64: Error Happening? This error is happening due to the lack of included values inside the declared statements in your code. The browser is going to render the information incorrectly and show this error, especially if you are working with Main and Similarity tools.
For me it helped to switch the "No Common Blocks" compiler setting to NO: It pretty much seems to make sense, the setting is explained here: What is GCC_NO_COMMON_BLOCKS used for?
From the errors, it would appear that the FacebookSDK.framework already includes the Bolts.framework classes. Try removing the additional Bolts.framework from the project.
Using Xcode 8, "Update project to recommended settings" option turned ON 'No Common Blocks' for my project.
Turning it back to OFF fixed everything up.
I've messed up my pods while downgrading a pod and I've managed to resolve the issue with duplicate symbols for architecture arm64 by removing the pods and installing them again with:
pod deintegrate
pod install
For me it was that i imported a file as a .m not a .h by mistake
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