Linker Command failed with exit code 1 use -v to see invocation Xcode 8 Swift 3

Question

I can t get rid of this error     I have tried all sorts of things like clearing Derived Data Preferences- Locations- click gray arrow to open Derived Data folder in Finder- right-click  move to trash   cleaning the project CMD Shift K or Product- Clean   updating carthage and dependencies  checked other answers on StackOverflow  mostly adjustments in Build Settings Phases   and recloned the app from github  etc   The same project works on my collaborators computers    EDIT  From the current top-rated answer  I was able to debug a little further   I am still not sure how to fix though  It looks like I have something in the project twice  I looked and can t find anything showing up twice   Here s a picture of the log

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I k now the question has already been answered. But if this helps somebody save some time : I had the same error. I checked everything to find a very small and stupid mistake from my side. I imported a core data ManagedObject custom file in a view controller of my project. I accidentally imported the .m file instead of the .h file which was causing the duplicate symbol in architecture error (linker command failed) because my .m file of properties class imports the .h file of core data class and hence causing duplicate import.

So just check if u have imported the right files before you try multiple solutions.!

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the only thing that worked for me was to run pod deintegrate and pod install

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Make sure the Find Implicit Dependencies checkbox is checked    Product -  Scheme -  Edit Scheme -  Build -  Find Implicit Dependencies

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One of the reasons of this problem might be  quot Build Active Architecture Only quot   You need set to true

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In my case  I was producing multiple products from the same project  For one of the products  the main m file imported a header file from another folder under the same project  But that file was not included in  quot Complied Sources quot  under  quot Build Phase quot   This caused a linker error  After carefully comparing the  quot Build Phases quot  settings for a product that could be built successfully  I realized that the  m file of the header needs to be included in the list of  quot Compiled Source quot   My issue was resolved after adding that file  Attaching a picture for clarity  The highlighted file had to be added

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A lot of solutions are mentioned above  No one worked for me but please try above first    Select Project -  Select Target -  Linked Framework and Libraries -  Add all pod libraries    remove if they exist in embedded binaries   Now remove these from Framework Folder in left file explorer of xcode   This solved my issue

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I got the same issues while making a build of Ionic 1 project   I was able to solve the issue after deleting the file CDVLogger h  amp  CDVLogger m

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Ok  I had the same problem just today and started googling it  when I came across this thread  I haven t finished reading the question when the answer struck my mind  I declared a class with an empty constructor  class MyClass      MyClass         void func one           code            void func two           code             MyClass            cout  lt  lt   Deleting object   lt  lt  endl              Then I thought why not terminating  not sure if I m correct with word selection here  but who cares  the constructor of my class with curly braces       So I did   class MyClass      MyClass          void func one           code            void func two           code             MyClass            cout  lt  lt   Deleting object   lt  lt  endl              The problem eliminated  my code started working perfectly   I know  the good practice is to investigate the issue and find the real cause  but this worked for me

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Did not have this problem when I built and ran on my own device  Only had this problem with simulators  I just simply restarted my computer and ran it  It worked

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I had the same problem  If you are checking out any github project  then instead of using git clone  use git lfs clone  as sometimes  some large files are not properly cloned by using git only  Also  make sure your bitcode is disabled

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did you try a clean  cmd   shift   k

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For me  the gem lock file was specifying an older version of cocoapods than the one I had installed  I had to re-branch and run bundle exec pod install instead of pod install

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I had same problem   The cause was that I declared same global variable in 2 files  So it was showing same error saying 2 duplicate symbols   The solution was to remove those variables

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It seems like the issue is different for most of us  and the error message has decent info  In my case  the Deployment Target was set to 10 13 by the export MACOSX DEPLOYMENT TARGET 10 13 line  but I was running 10 14  So I had to switch my Deployment Target to 10 14 in General   Deployment Info  in order for the ITLibrary-related symbols to be available again   cd  Users foo src scrobble macos itunes-scrobble     export MACOSX DEPLOYMENT TARGET 10 13      SNIP      Undefined symbols for architecture x86 64      OBJC CLASS   ITLibMediaItem   referenced from        objc-class-ref in AppDelegate o     OBJC CLASS   ITLibPlaylist   referenced from        objc-class-ref in AppDelegate o     OBJC CLASS   ITLibrary   referenced from        objc-class-ref in AppDelegate o ld  symbol s  not found for architecture x86 64 clang  error  linker command failed with exit code 1  use -v to see invocation

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I had the same problem using Carthage for dependencies    Just go to Select Project -  Build Settings -  Search for Enable Bitcode -  If it is selected to Yes  select  No   That solved this problem for me

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I was testing the Sparkle framework with CocoaPods   Sadly  I put pod  Sparkle      gt  1 21  in the PodFile in the wrong place  I put it underneath Testing  for unit tests    Once placed in correct spot in PodFile  everything s fine

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Select the project-  Build Phase- Link Binary with libraries and add all pod libraries

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Here is my problem and solution    I removed two files from the source code using source tree Version controller   After applying the diff  that contains the two classes I removed  Xcode didn t add it automatically  So I got linker error   I manually added the files  by right click on group name and select  Add files to    Now my error got resolved   If anyone faced the linker error regarding class file  then try to add it manually

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In my case the reason of the error is library which was linked two times   I use react-native so it was linked automatically using react-native link and manually in xcode

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i was facing same issue today in xcode 8 version 8 3 2  right click on issue --  reveal in log    then you are able to check what is causing that issue

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In my case I have change the Target name in my Podfile So it s create the same Error for me      Solution   Just go project- gt  Build Phase- gt Link Binary with libraries Remove the old FrameWorks by click on minus button -  And clean and Run again  It s work me     Remove Unwanted  framework

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Maybe you installed a pod file and you are still trying to build from the  xcodeproj file instead of  xcworkspace

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Okay   So here is what solved my problem     in App Delegate File    import  AppDelegate h   import  DarkSkyAPI h     import  Credentials h    I had imported Credentials h already in the DarkSkyAPI m file in my project  Commenting out the extra import made the error go away   Some things to mention and maybe help anyone in the future   umairqureshi 6 s answer did help me along the process  but did not solve it  He led to where I was able to dig out the info  I kept seeing AppDelegate and DarkSkyAPI files showing up in the error log and the information it was pulling from Credentials file was causing the error  I knew it had to be in one of these 3 files  so I immediately checked imports  because I remembered hearing that the  h carries all the imports from its  m file  Boom

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The other answers didn t work for me so here I share my solution in case it might help somebody else   My problem was that I was configuring the Podfile of my XCode-Project for the wrong platform  Changing  platform  ios  at the beginning of my Podfile to  platform  macos  worked for me to get rid of the error

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I just had to do import Foundation   I was using Kitura for Swift server side and kept forgetting this

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For any one having this issue with Flurry framework  This is what fixed my issue  For me the issue was that i had imported the following files but never used them   libFlurryTVOS 9 2 3   libFlurryWatch 9 2 3    So all I had to do was go to project target settings and remove these 2 files from the  Linked framework and libraries  section and the problem was solved

[ios] Linker Command failed with exit code 1 (use -v to see invocation), Xcode 8, Swift 3

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