duplicate symbols for architecture x86_64 (Implementing FBSDKCoreKilt) Swift

This is the most horrifying error that I've dealt with so far. To be clear:
This is in swift so it's not a ".h" ".m" issue
My compile sources is so tiny, there are no duplicates there.
I have redownloaded the SDK several times but it never works.
The project only has two frameworks in it: FBSDKCoreKit and LoginKit
Any ideas? What is duplicated?
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginButton.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginButton.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginCompletion.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginCompletion.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginConstants.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginConstants.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginError.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginError.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginManager.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginManager.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginManagerLoginResult.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginManagerLoginResult.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginTooltipView.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginTooltipView.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginUtility.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginUtility.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKTooltipView.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKTooltipView.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(_FBSDKLoginRecoveryAttempter.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(_FBSDKLoginRecoveryAttempter.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginManagerLogger.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKLoginKit.framework/FBSDKLoginKit(FBSDKLoginManagerLogger.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKSystemAccountStoreAdapter.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKSystemAccountStoreAdapter.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKGraphRequestPiggybackManager.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKGraphRequestPiggybackManager.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAppEventsStateManager.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAppEventsStateManager.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKServerConfigurationManager.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKServerConfigurationManager.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKGraphRequest.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKGraphRequest.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKContainerViewController.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKContainerViewController.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessTokenCache.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessTokenCache.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKCrypto.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKCrypto.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAppEventsState.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAppEventsState.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKCloseIcon.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKCloseIcon.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKBase64.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKBase64.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKBridgeAPIProtocolWebV2.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKBridgeAPIProtocolWebV2.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKGraphRequestBody.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKGraphRequestBody.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKUtility.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKUtility.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKBoltsMeasurementEventListener.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKBoltsMeasurementEventListener.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKLogger.o)
duplicate symbol _llvm.embedded.module in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKLogger.o)
duplicate symbol _llvm.cmdline in:
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKAccessToken.o)
    /Users/charleswesleycho/Documents/FacebookSDK/FBSDKCoreKit.framework/FBSDKCoreKit(FBSDKApplicationDelegate.o)
duplicate symbol _llvm.embedded.module in:

ld: 142 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
dancampers
Its an issue with the latest Facebook SDK (Sept 10th 2015). Download the release before it.
See this answer https://stackoverflow.com/a/32519847/1052084 which worked for me.
thanks this working with me when using facebook SDK https://developers.facebook.com/resources/FacebookSDKs-iOS-20150813.zip
This can also be caused by any included static libraries or sub-projects that are included with your project, having a different target version ie. you have an externalSourcesLibrary project and it's build target is set to minimum version 6.0 while your main project is set to something higher like 8.4 or vice versa.
来源：https://stackoverflow.com/questions/32529395/duplicate-symbols-for-architecture-x86-64-implementing-fbsdkcorekilt-swift
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linker-errors