Duplicate symbols for architecture x86_64 under Xcode

🚧 How to Solve Duplicate Symbols for Architecture x86_64 under Xcode 🚧

So, you're working on your Xcode project, trying to build it, and suddenly BAM! 💥 You hit an error that says "Duplicate symbols for architecture x86_64." Not cool, right? 😩 But don't worry, my tech-savvy friend, I've got your back! 🤜🤛 In this blog post, I'll share with you some common issues related to this problem, provide easy solutions, and give you a compelling call-to-action to engage with our wonderful tech community. Let's dive in! 💻🚀

What's the Problem? 😕

Here's the context around the question that brought us here today:

/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)

In a nutshell, we have duplicate symbols for the x86_64 architecture. 😱 Double trouble! But fear not, for we have the solution! 💪

Easy Solutions! 🛠️

1️⃣ Check your "Other Linker Flags"

Our hero who posted the question mentioned that they added -ObjC to the "Other Linker Flags." Well, that might be the culprit 🕵️‍♂️! Go ahead and open your Xcode project, follow these steps:

1. Click on your project name in the Xcode file explorer.

2. Select your target under the "TARGETS" section.

3. Go to the "Build Settings" tab.

4. Look for the "Other Linker Flags" setting.

5. Remove the -ObjC flag if it's there.

By removing this flag, you might be able to build your project successfully once again! But wait, why does this work? 🤔

2️⃣ Understanding the -ObjC Flag

The -ObjC flag tells the linker to load all Objective-C classes and categories from static libraries. However, this flag can cause issues when multiple libraries have the same symbols, leading to duplicate symbol errors like the one you encountered. By removing the flag, you avoid this conflict and live happily ever after with a successfully built project! 🎉

Engage with the Tech Community! 🌐

Now that we've solved the problem, it's time to engage with our tech-savvy community and keep the knowledge flowing! Here's what you can do:

1. Share this blog post: Help other developers who might stumble upon the same issue by sharing this easy-to-read guide. Spread the love! ❤️

2. Leave a comment: Did this solution work for you? Did you encounter any other challenges or have additional insights? Share your experience in the comments below. Let's learn together! 🤝

3. Connect on social media: Join the conversation on Twitter, Facebook, and Instagram using the hashtag #DuplicateSymbolsXcode. Follow us for more tech tips, advice, and engaging content! 📱💻

And there you have it, my friend! 🎉📚 Now you know how to solve the problem of duplicate symbols for architecture x86_64 under Xcode. Remember, in the world of programming, problems are just opportunities to learn and grow. Embrace them, ace them! 💪 Don't forget to stay connected and keep the tech community alive and thriving. Happy coding! 👨‍💻🚀