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I am in a sticky situation where for the last couple of days I havent been able to progress with sharekit implementation because I am getting a duplicate symbol error with RestKit. I am running with iOS 5.1 and the latest version of xcode. I have both libraries installed as to the guidelines given. I dont understand how to remove references of this from ShareKit or RestKit without causing problems in one or the other. I really need some help on this one... Thanks.

duplicate symbol _OBJC_IVAR_$_GCOAuth.OAuthParameters in:
    /Users/josephboston/Library/Developer/Xcode/DerivedData/Prowd_Wallet-ezxvmeygcnwgtzehshsnnprpsjww/Build/Products/Debug-iphoneos/libShareKit.a(GCOAuth.o)
    /Users/josephboston/Library/Developer/Xcode/DerivedData/Prowd_Wallet-ezxvmeygcnwgtzehshsnnprpsjww/Build/Products/Debug-iphoneos/libRestKit.a(GCOAuth.o)

my project

jimbob
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  • Same .m having two different target can also cause this issue. Check my answer please in case someone comes to this question looking for an answer.[Check my answer if that is a case.](http://stackoverflow.com/a/24394570/818506) – rohan-patel Jun 24 '14 at 19:24

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You are getting this error because both frameworks are using a common third party framework. So Xcode is complaining about duplicate symbols. This blog, "Avoiding duplicate symbol issues when using common utilities within a static library" is explaining a way to fix this.

Here is the solution mentioned there,

I’m working on two projects right now that have static library products, to be given to other developers to use in their projects: Audiobus and The Amazing Audio Engine. In both cases, I’m making quite heavy use of my circular buffer code, TPCircularBuffer, which would result in duplicate symbol errors if the static library were linked with another project that used it.

Use the preprocessor to rename the symbols automatically during the build phase.

This is done by adding a series of -DOldSymbol=NewSymbol flags to the ‘Other C Flags’ build setting – like -DTPCircularBuffer=ABCircularBuffer, for instance.

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Community
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iDev
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  • ok I am a little bit confused by this one... Can you give me a more specific example? I am slow. Thanks. – jimbob Dec 25 '12 at 19:50
  • Basically you need to open the static library Xcode project and in their build settings, you might have to do something similar to this for every duplicate symbols. I am sorry, but I cant verify this without having the actual code since I never faced this issue. Just saw this suggestion and thought of sharing it. – iDev Dec 25 '12 at 20:01
  • Just to clarify... ACB is a random choice of yours? just to change the name right? – jimbob Dec 25 '12 at 20:03
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    Well, that blog is not mine, and I am guessing that "ACB" was just a random word he assigned. In his blog, he is mentioning assigning to `-DTPCircularBuffer=ABCircularBuffer`. – iDev Dec 25 '12 at 20:10
  • @jimbob, In case you feel the above answer is helpful, you can upvote/accept the answer. – iDev Dec 25 '12 at 21:35
  • its definitely very helpful – jimbob Dec 26 '12 at 01:41
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GCOAuth is used in ShareKit by Evernote sdk only. So if you can live without Evernote sharer, quick workaround might be to remove evernote and evernote sdk from ShareKit, using granular install

Vilém Kurz
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