Reputation: 8115

Duplicate symbols for architecture x86_64 under Xcode

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?

Upvotes: 308

Answers (30)

Ranjit Singh

Reputation: 54

When using swiftui swift package manager, remove @Main attribute from swiftui code.

Upvotes: 1

TrappinNachos

Reputation: 117

If you are still unable to resolve this issue, try Product > Clean Build Folder ...

That's the only thing that worked for me.

Upvotes: 0

wwarren07

Reputation: 27

My issue with this error was the Podfile. I'm using Firebase and one of their pods was the problem.

I removed all firebase pods from the Podfile
Deleted the derived data by running this code in the terminal. rm -rf ~/Library/Developer/Xcode/DerivedData/
then reinstalled the pods I needed one by one.

Upvotes: 0

gprathour

Reputation: 15333

If you're coming here for a React Native Project, then go to the following,

Targets -> <Your-App> -> Build Settings -> Dead Code Stripping

Change from No to Yes for Debug.

P.S. This approach works for React Native projects, not sure if it will work for a native project too.

Upvotes: 4

Georgy Ivanov

Reputation: 35

So, I have solved this by deleting pods which is related to Fabric, because it was conflicting with Crashlitics pod, since they actually duplicate each other, because Fabric it's just old version of Crashlitics

Upvotes: 0

ButterflyRay

Reputation: 423

I got the same issue in Xcode 14. Cleaning the build folder worked for me.

Select "Clean Build Folder" option from "Product" menu.

Upvotes: 0

karthik mano

Reputation: 111

I am also faced this issue on FBReactNativeSpec, just made check on Run script - For install builds only

Upvotes: 0

Pramod

Reputation: 1133

For me, this happened when mistakenly I defined two entry points for my APP

@main struct AppName: App { //Comment - @main

@UIApplicationMain class AppDelegate //Comment - @UIApplicationMain

Upvotes: 3

Yevgen Somochkin

Reputation: 61

Ive got this error after installed alamofires pod, but alamafire was already installed as package through xcode`s File/Add Packages.... error gone after I removed the package and also removed it from Targets/General/Frameworks...

Upvotes: 0

MIPB

Reputation: 2471

For the case of React Native, the solution was simply deleting all of the libraries in: Target > Build Phases > Link Binary with Library.

I don't really know the cause, but I assume React Native already has the packages installed, creating duplicates.

Upvotes: 1

Kalamarico

Reputation: 5686

My problem was that I had 5 duplicate symbols for architecture x86_64. After reading this post and their answers, I try with the common solution about change GCC_NO_COMMON_BLOCKS = YES to NO

But, instead of working for me, I went from 5 duplicates to 1 duplicate...

So, I paid attention to that last error, and I realized what was my problem, and it was an "incompatibility" with these packages (I had both in package.json):

rn-fetch-blob
react-native-blob-util

The message was clear about it, and I remove rn-fetch-blob because I have not idea why it was in my project, but, I only used with jest and delete it, it wasn't a problem.

So, after removing that package, and run yarn again, problem solved... And without changing the GCC_NO_COMMON_BLOCKS

Upvotes: 10

3Bady

Reputation: 203

This Answer works with Xcode 12.5.1, worked for me on 2021

Close your Xcode project.
Go to your project directory, if you use flutter don't forget to get in "ios" file in the project folder.
Delete [Pods, Podfile, Podfile.lock].
Run the terminal.
Go to your project directory.

If you use swift you're done here jump to xcode and run the app or keep on if you're using flutter

Run flutter clean.
Run flutter pub get.
Run flutter run. Don't forget to run the simulator before you use flutter run command.

Congrats everything should work!

Upvotes: 1

Vikram Chaudhary

Reputation: 590

I tried following this steps and It works for me now.

Open Xcode > Pods > Targets Support Files > Pods-{TARGET-NAME}

find "OTHER_LDFLAGS" and remove only "-ObjC" in these two files:

Pods-{TARGET-NAME}.release.xcconfig & Pods-{TARGET-NAME}.debug.xcconfig
Go to project main target > Build Settings > Other Linker Flags:

Make sure no "-ObjC" is left in the value
I deleted the build/Build folder in ios and run-ios again. It works now.

Upvotes: 1

Pnemonic

Reputation: 1825

My mistake was having implemented functions in header files. There should be a clear separation between function definitions in header files, and function implementations in the code files.

For example, I had something like:

my_header.h

#ifdef my_header_h
#define my_header_h

int foo() { return 123; }

#endif // my_header_h

which should be:

#ifdef my_header_h
#define my_header_h

int foo();

#endif // my_header_h

Upvotes: 1

Dovahkiin

Reputation: 1239

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

Upvotes: 1

T D Nguyen

Reputation: 7613

Update answer for 2021, Xcode 12.X:

pod deintegrate 
pod install

Hope this helps!

Upvotes: 11

Rasheed Qureshi

Reputation: 1273

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

Upvotes: 0

Matt C

Reputation: 63

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.

Upvotes: 4

jonypz

Reputation: 1555

1.Go to Build Phases

2.Search for the file name

3.Delete duplicate

-> Error will go away.

If it doesn't, try to search for "file.m", if you see any #import "file.m" , clear this line

Upvotes: 2

Asbis

Reputation: 532

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

Upvotes: 0

Anderson Bressane

Reputation: 416

In my case, i changed the Build System to Legacy and it worked.

You can access this option in the menu:

File > Workspace Settings > Build System

Upvotes: -1

Frostmourne

Reputation: 174

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

Upvotes: 0

Rajat Chaudhary

Reputation: 175

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

Upvotes: 0

Ankur Lahiry

Reputation: 2315

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

Upvotes: 1

user4414149

Reputation:

If you're using and think it might be your pods, try this:

pod deintegrate
pod install

Upvotes: 2

TDesign

Reputation: 597

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.

Upvotes: 24

Kasey

Reputation: 414

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. :)

Upvotes: 4

Faye Hayes

Reputation: 263

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.

Upvotes: 4