Duplicate Symbols for Architecture arm64

Question

When I try running my Xcode Project it fails with an error stating that I have duplicate symbols  I looked online where the find these duplicates but have had no luck     Any ideas how to fix this

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Another Solution is to      Select Project -  Target -  Build phase -  Compile source -  search   for the file which is mentioned in the 3rd last error line  In your   case BFAppLinkReturnToRefererView o     Then you will see either 1 or 2 files in search result    Remove one of them and compile again  It should recompile now because there is only one file left and no more conflicts for build   If that doesnt work the file probably has errors in it and you should remove all of them and then recompile   It should work again

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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

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From the errors  it would appear any Classes appear multiple time Find and removed that Classes it will working   Am creating AppDelegate h and  m file creating multiple time  So this error will occur Finally find and removed that classes it s working fine for me

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This error happens when Linker is trying to link the obj files  Few reasons that i could think of for this error are    The duplicated Function Class is defined at two different places files in the project and only one of them was supposed to compile for any variation of build command  But somehow both those files got compiled in your project  So you need to check your if-else conditions or other dependencies which adds src files to the list of files needed to be compiled and remove the un-needed file for your particular build command  The duplicated Function Class is defined accidentally at two different places files in the project  Remove the wrong definition  Clean your OBJ directory before you build again  there could be some old obj files in there from your previous builds which might be causing this conflict     P S i am no expert  but this is how i solved this problem when i faced it

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I got this issue because I was lazily defining a variable in my  m outside of a method  then in another  m file I was defining another variable with the same name outside a method  This was causing a global variable name duplicate issue

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Below Patch work for me      Step 1  Go to TARGETS - gt  Build Settings - gt  No Common Blocks - gt  No  Step 2  Go to TARGETS - gt  Build Settings - gt  enable testability - gt  No   Setting it back to NO solved the problem

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If you are moving to Xcode 7 or 8 and are opening a really old project  I ve encountered this problem   in SomeConstFile h  NSString   const kAConstant    in SomeConstFile m  NSString  const kAConstant     a constant     Earlier versions of the compiler assumed that the definition in the header file was extern and so including SomeConstFile h all over the place was fine    Now you need to explicitly declare these consts as extern   in SomeConstFile h  extern NSString   const kAConstant

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See Duplicate symbol error when adding NSManagedObject subclass  duplicate link

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to solve this problem go to Build phases and search about duplicate file  like  facebookSDK   unityads   and delete  extension file o  then build again

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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

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For me  the issue was the style of creation of const  that worked fine until this iOS8   i had a few lines as   int const kView LayoutCount   3    in my  h file  Six lines like resulted in 636 linker files once common blocks was set to NO   14k  if YES   Moved the lines to  m after stripping  h of the value declaration and compilation was good to go   Hope this helps others

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The problem for me was I had manually included a framework but then also included that same framework in CocoaPods not knowing I did so  Once I removed one or the other  the problem went away

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I got this issue when I had two files that had the same name on accident  large project  oops   Ironically they were actually the same file  I just had forgotten that I had already created one as a placeholder weeks earlier and gave it the same name again  haha

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I was able to resolve this error which said  158 duplicate symbols for architecture armv7   158 duplicate symbols for architecture arm64  --- If this is what you are getting too  then it means you are trying to compile a file which is importing or inheriting a framework or static library having references to C   code or files  An easy way to handle this would be to change the extension of your  m file to  mm  This is how it gets handled if you are using Objective C  not sure on Swift though   Also in your build settings - you can update the  other linker flags  to -lc

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On upgrading to Xcode 8  I got a message to upgrade to recommended settings  I accepted and everything was updated  I started getting compile time issue    Duplicate symbol for XXXX Duplicate symbol for XXXX Duplicate symbol for XXXX  A total of 143 errors   Went to Target- Build settings -  No Common Blocks -  Set it to NO   This resolved the issue  The issue was that the integrated projects had code blocks in common and hence was not able to compile it  Explanation can be found here

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For me it was that i imported a file as a  m not a  h by mistake

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check your include file  I had this issue because I accidentally  imported  filename m  instead of  filename h   autocorrect  tab  put an  m  not  h

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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

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Plz Change setting  Step 1  Go to TARGETS - gt  Build Settings - gt  No Common Blocks - gt  No Step 2  Go to TARGETS - gt  Build Settings - gt  enable testability - gt  No

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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

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In my case reason was too stupid     I had a Constant h file where I had macros defined   I thought of doing NSString there  and did this     NSString const  kGreenColor      00C34E     this caused the problem of Duplicate Symbols for Architecture arm64  and Linker command failed with exit code 1  Removing const NSString line worked for me

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Well   some times when using SDK like FB or Libraries like Vuforia or GoogleAnalytics   adding sample projects may cause the problem that they re already including Frameworks and like so  so you must make sure not repeating symbols you add manually while they re already included in samples

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If someone is experimenting this working on Flutter  don t try to pod deintegrate  pod init   How I solved is running flutter clean  flutter run -d  iOS Device   Hope can help somebody

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For me  I created a method called sampleMethod in ViewController A and created the same method in ViewController B too  It caused me this error  then i changed the method name in ViewController B to secondSampleMethod  It fixed the error   Seems like a Good feature to reduce the code and not to duplicate the same code in many places   I tried changing the No Common blocks from Yes to No then enabling testability from Yes to No  It didn t worked  I Checked duplicate files also in build phases  but there is no duplicate files

[ios] Duplicate Symbols for Architecture arm64

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