Duplicate symbols for architecture x86 64 under Xcode

Question

I now have the same question with above title but have not found the right answer yet  I got the error        Users nle Library Developer Xcode DerivedData TestMoboSDK-Client-cgodalyxmwqzynaxfbbewrooymnq Build Intermediates TestMoboSDK-Client build Debug-iphonesimulator TestMoboSDK-Client build Objects-normal x86 64 MoboSDK o      Users nle Library Developer Xcode DerivedData TestMoboSDK-Client-cgodalyxmwqzynaxfbbewrooymnq Build Products Debug-iphonesimulator libMoboSDK a MoboSDK o  duplicate symbol  OBJC METACLASS   MoboSDK in       Users nle Library Developer Xcode DerivedData TestMoboSDK-Client-cgodalyxmwqzynaxfbbewrooymnq Build Intermediates TestMoboSDK-Client build Debug-iphonesimulator TestMoboSDK-Client build Objects-normal x86 64 MoboSDK o      Users nle Library Developer Xcode DerivedData TestMoboSDK-Client-cgodalyxmwqzynaxfbbewrooymnq Build Products Debug-iphonesimulator libMoboSDK a MoboSDK o  ld  75 duplicate symbols for architecture x86 64 clang  error  linker command failed with exit code 1  use -v to see invocation    Any help is appreciated   Finally  I find out the reason of this error cause I added -ObjC to the Other Linker Flags  After remove this value then I can build my project successfully  but I don t know why  Can anyone explain this

User · Answer

This answer explains well as to why this problem occurs:

Xcode C++ :: Duplicate Symbols for Architecture x86_64

In my opinion you do not need to turn any of the flags off or change Xcode settings, re-read your code, and fix the problem. Changing the settings would just subside the inflammation not the cause.

User · Answer

The answers above didn t work for me  Here s how I got around it   1  in finder  delete the entire Pods folder and Podfile lock file  2  close the xcode project  3  run pod install in the terminal 4  open the xcode project  run the clean build command   Worked for me after that

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I also have this fault today That s because I defined a const value in a  m file But I defined another  m file that also included this const value That s means it has two same const values So this error appears  And my solution is adding a keyword  static  before the const value such as   static CGFloat const btnConunt   9    And then I build the project it won t report this error

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Defining same variable under  implementation in more than one class also can cause this problem

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I found the accepted answer touches on the problem but didn t help me solve it  hopefully this answer will help with this very frustrating issue   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    In layman s terms this means we have two files in our project with exactly the same name  Maybe you are combining one project into another one  Have a look at the errors above the  duplicate symbols  error to see which folder is duplicated  in my case it was BLoginViewController   For example  in the image below you can see I have two BImageViewControllers  for me this is what was causing the issue   As soon as I deleted one then the issue vanished

User · Answer

1 Go to Build Phases 2 Search for the file name 3 Delete duplicate - gt  Error will go away  If it doesn t  try to search for  quot file m quot   if you see any  import  quot file m quot    clear this line

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75 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   from Technical Q amp A     This flag causes the linker to load every object file in the library   that defines an Objective-C class or category  While this option will   typically result in a larger executable  due to additional object code   loaded into the application   it will allow the successful creation of   effective Objective-C static libraries that contain categories on   existing classes    https   developer apple com library content qa qa1490  index html

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In my case  there were two file by same name in the location      Targets   Build Phases   Compile Sources and delete any duplicate files

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Another silly mistake that will cause this error is repeated files  I accidentally copied some files twice  First I went to Targets -  Build Phases -  Compile sources  There I noticed some files on that list twice and their locations

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In my case I had two main   methods defined in my project and removing one solved the issue

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My situation with some legacy project opened in Xcode 7 3 was   duplicate symbol  SomeEnumState in    followed with list of two unrelated files o  then this was repeated couple of times  then finally   ld  8 duplicate symbols for architecture x86 64 clang  error  linker command failed with exit code 1  use -v to see invocation    What solved it for me was changing enum declaration from   enum SomeEnumState       SomeEnumStateActive   0      SomeEnumStateUsed   1      SomeEnumStateHidden   2   SomeEnumState    to this   typedef NS ENUM NSUInteger  SomeEnumState        SomeEnumStateActive   0      SomeEnumStateUsed   1      SomeEnumStateHidden   2      If somebody has explanation for this  please enlighten me

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Go to Targets    Select Build Settings     Search for  No Common Blocks   select it to NO    It worked for me

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Happens also when you declare const variables with same name in different class   in file Message m  const int kMessageLength   36    implementation Message   end   in file Chat m  const int kMessageLength   20    implementation Chat   end

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In my case  I just created a header file to define constant strings like this   NSString  const AppDescriptionString     Healthy is the best way to keep fit     I solved this scenario by using static   static NSString  const AppDescriptionString     Healthy is the best way to keep fit

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None of above solutions works for me  I just fixed it myself   I got duplicate symbol of my core data model which I make it myself  but  in my  xcdatamodeld inspector  I choose Class Definition of Codegen property  I guess that s what s wrong with  Then I choose Manual None it got fixed   Hope this can be helpful for you

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In Xcode 6 3 2  I have checked all possibility like as belowed  1  I have not import  m file in my project   2  Removed -ObjC from Other linker flag   3  Removed all my derive Data   still i am getting same error  I have removed this error by removing any variable declaration from  pch file  in my case  i have declared AppDelegate object in  pch file  finally i found reason that cause error  so i remove declaration of any variable from  pch file and my project working charm

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I face the same error what i did  1 Copy the duplicate symbol file  class name or framework name  from the end which is just showed above of the line  duplicate symbols for architecture x86 64    2  Paste it in Find Navigator and press enter  It showed me duplicate class  I remove the duplicate class and run successfully

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Following steps solved the issue for me    Go to Build Phases in Target settings  Go to    Link Binary With Libraries     Check if any of the libraries exist twice  Build again

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None of the above mentioned answer helped  as i had similar errors in pods and locally stored framework that looked like this  duplicate symbol   OBJC METACLASS   EZAudioDevice  in       Users  yourUserName  Desktop Source Code  yourProjectName  Pods AudioKit iOS AudioKit framework AudioKit EZAudioDevice o       Users  yourUserName  Desktop Source Code  yourProjectName  ChirpSDK framework ChirpSDK EZAudioDevice o   So the fix was to locate  Users  yourUserName  Desktop Source Code  yourProjectName  Pods directory in project where you will find these two files namely   Pods- yourProjectName  debug xcconfig Pods- yourProjectName  release xcconfig  In both of these files  you need to remove -ObjC flag under OTHER LDFLAGS     inherited   the rational for removing this is as same as already mention here

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I got the same error when I added a pod repository   pod  SWRevealViewController    for an already added source code  SWRevealViewController  from gitHub  So  the error will be fixed by either removing the source code or pod repository   Case   2   The 2nd time  this error appeared when I declare a constant in  h file   NSString   const SomeConstant      SomeValue    interface AppDelegate   UIResponder  lt UIApplicationDelegate gt

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I experienced this issue after installing Cocoapods  Now happens everytime I update some pods  Solution I ve found    Go to terminal    1  pod deintegrate 2  pod install   Also  check the item  Always Embed Swift Libraries  in your Build Settings  It should be  faded  indicating it is using the default configuration  If its set to a manual YES  hit delete over it to revert it to the default configuration  This stopped the behavior

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In my case  I named an Entity of my Core Data Model the same as an Object  So  I defined an object  Event h  and at the same time I had this entity called  Event   I ended up renaming the entity

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Please check with the pod and Libraries you added  There should be one or more libraries are repeated  Please remove it from one side  I will fix the issue  And the effected library will listed in x-code error message detail

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Remove -all load from Other Linker Flags  It works on my project

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This error happened to me when I implemented a class method with a scope resolution operator in the header file  instead of  cpp file    PS  And I was programming in C   on Macbook Yosemite

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Same issue happen with me  when I was integrating the lob project inside my project     Actually lob project also have the AFNetworking files  So I remove the  m files from lob project     Actually  m files are conflicting with My project POd AFNetworking   m files

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For me during the Xcode8 recommended project settings update  No Common Blocks  to YES which causes this issue

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Similar to Juice007  I had declared and initialized a C type variable in two different  m files  that weren t imported    BOOL myVar   NO    however  this method of declaring and initializing a variable  even in  m  even in  implementation grants it global scope  Your options are    Declare it as static  to limit the scope to class   static BOOL myVar   NO   Remove the initialization  which will make the two classes share the global var    BOOL myVar  - void  init      myVar   NO     Declare it as a property      property BOOL myVar   Declare it as a proper iVar in the  interface   interface myClass        BOOL myVar     end

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In my case  i changed the Build System to Legacy and it worked  You can access this option in the menu  File  gt  Workspace Settings  gt  Build System

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Fastest way to find the duplicate is    Go to Targets Go to Build Phases Go to Compile Sources Delete duplicate files

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I hope it will definitely help you  I got same error 3 duplicate symbols for architecture x86 64   in my case I have copied code from another file of same project eg  code of A m file to B m and after complilation i got an error as mention  and i have solve error by changing the name of global Variable    this error came in my case because of same declare for global variable in both file

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I have same problem  In Xcode 7 2 in path Project Target   Build Setting   No Common Blocks  i change it to NO

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Can you try clear all plugin under the plugin folder   It is worked for me

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If you re using and think it might be your pods  try this    pod deintegrate pod install

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Because I haven t seen this answer   Uninstall and reinstall your podfiles  Remove or uninstall library previously added   cocoapods  I ve run into this issue over 3 times building my app and every time this is what fixes it

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For me  changing  No Common Blocks  from Yes to No   under Targets- Build Settings- Apple LLVM - Code Generation   fixed the problem

User · Answer

If you have some common functions defined in a header file  change them into inline

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I simply just unistalled all my pods and reinstalled them  I also got rid of some pods i did not use

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Make sure you haven t imported a  m file by accident  you might want to delete your derived data in the Projects Window and then build and run again

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For anyone else who is having this issue  I didn t see my resolution in any of these answers   After having a  pbxproj merge conflict which was manually addressed  albeit poorly   there were duplicate references to individual class files in the  pbxproj  Deleting those from the Project   Build Phases   Compile Sources fixed everything for me   Hope this helps someone down the line

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Stupid one  but make sure you haven t  imported a  m file by mistake somewhere

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Sometimes  this happens when you have the wrong file in import like for ex       import  MenuItem m    Instead of      import  MenuItem h    this will throw that duplicate error duplicate symbols for architecture x86 64

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This occurred on me when I accepted  recommended settings  pop-up on a project that I develop two years ago in Objective-C   The problem was that when you accepted the  recommended settings  update  Xcode automatically changed or added some build settings  including GCC NO COMMON BLOCKS   YES    This made the build failed with the duplicate symbol error in my updated project  So I changed No Common Block to NO in my build settings and the error was gone

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Update answer for 2021  Xcode 12 X  pod deintegrate  pod install  Hope this helps

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Ensure you are not importing  ViewController m  instead of header file   import  ViewController m

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Today   I got the same error   The error s key word is duplicate  I fix it by   1  Remove the duplicate file at Build Phases-- gt Compile Sources 2  If you can not remove it at Build Phases  you need find the file at your project and remove the reference by DELETE       3  Add the file to your project again 4  Add the file s  m to your Build Phases-- gt Compile Sources again 5  Build your project  the error will disappear

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just uninstall the pod which it is related to and reinstall them

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I just encoutered the problem  The pod deintegrate or Removing podfile lock ways would be helpful for you  but try the following sequence   that may be more helpful than deintegrating the pod files  Comment all the pods in Podfile run the pod install  it will remove Pods folder from the project Uncomment all the pods in Podfile run again pod install

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This error generally occurs when you have linked any library or file twice  In the error desciption  the name of the duplicated file will be listed  you can search and and make sure you don t have duplicates  If you find duplicates  remove reference to one of them to play safe

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Remove -ObjC from Other Linker Flags or Please check you imported any  m file instead of  h by mistake

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Recently had a headache looking for source of an error  I was wondered  when i found out that my app doesn t want to compile  simply because i had following code snippet in different classes   dispatch time t getDispatchTimeByDate NSDate  date        NSTimeInterval interval      double second  subsecond      struct timespec time      dispatch time t milestone        interval    date timeIntervalSince1970       subsecond   modf interval   amp second       time tv sec   second      time tv nsec   subsecond   NSEC PER SEC      milestone   dispatch walltime  amp time  0        return milestone      Hope that might help someone

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I ve just had this error as well  Found that the problem was variables declared with global scope  with the same names  were being repeated throughout the files being compiled into the program  Once changing the global variables to local scope to the pseudo-main function the error was resolved

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Open your project in XCode you will see the sidebar now focus on the attached image  Search your specific SDK or any dublicate file where you facing an issue  You will see that you have added any file twice  just remove that file and your issue will be resolved  Note  you have to remove the file from that place where you add it wrongly  FOR EXAMPLE  Note  Just remove FBSDKCoreKit from Frameworks Good Luck

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