CODEWITHSUNDEEP
iosxcodecpu-architecture
batistomorrow
batistomorrow

Reputation: 674

Undefined symbols for architecture x86_64 on Xcode 6.1

All of a sudden Xcode threw me this error at compilation time: 

Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_Format", referenced from:
 objc-class-ref in WOExerciseListViewController.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

After doing some research, I may understand that a library I'm using is not compatible with 64 bit version. But this is very strange since I've been working with the same libraries for at least a week without having a single compilation problem during that time. The two libraries are just composed of a bunch of classes, and when I removed them from my project I got the same issue. Since I have never created libraries myself, I have no idea how I can find wether the ones I'm using are compatible with 64 bit (?) I also tried the following changes for architectures under the target panel :

But none of these changes work. Please, does someone have a clue on this? Thanks

Upvotes: 42

Views: 110411

Answers (13)

auco
auco

Reputation: 9579

I just had this error when I opened a (quite) old project, created in Xcode 4~ish, in Xcode 6.4. While the linked Frameworks were visible in the Project sidebar, I overlooked that there were no linked libraries in the Target Build Phases tab. Once I fixed that, it compiled fine.

Upvotes: 4

Seif Meddeb
Seif Meddeb

Reputation: 122

I just had the exact same error, and solved it by restarting xcode.

For me the issue occurred after an svn update, the file in question was added to the projects folder, but it never appeared in xcode(9.3.1) – until I restarted it.

Upvotes: 1

Banane
Banane

Reputation: 835

Apparently, your class "Format" is involved in the problem. Check your declaration of this class, especially if you did it inside another class you probably forgot the @implementation or something similar.

Upvotes: 46

Nikita Tepliakov
Nikita Tepliakov

Reputation: 69

I solved the problem by deleting reference to the file and adding it again in project. In my case it works.

Upvotes: 0

Alberto M
Alberto M

Reputation: 1760

I simply wasn't linking the libraries in the "Link Binary with Libraries" section.

Upvotes: 2

Koppi
Koppi

Reputation: 37

Delete the $(ARCHS_STANDARD) and add the $(ARCHS_STANDARD_32_BIT).

enter image description here

Upvotes: -3

issam
issam

Reputation: 697

this setting worked for me:

  • Architectures=$(ARCHS_STANDARD_32_BIT)
  • Build Active Architecture Only:YES
  • Valid Architectures armv6 armv7 armv7s arm64

Upvotes: -2

chengbo
chengbo

Reputation: 5819

It turned out I forgot to write my @implementation part.

Upvotes: 3

zeeawan
zeeawan

Reputation: 6905

Same error when I copied/pasted a class and forgot to rename it in .m file.

Upvotes: 0

user3894518
user3894518

Reputation: 677

Check if that file is included in Build Phases -> Compiled Sources

Upvotes: 44

Youssef Gamil
Youssef Gamil

Reputation: 266

Make sure the WOExerciseListViewController is a Target Member; that worked for me!

enter image description here

Upvotes: 20

Nishant Mahajan
Nishant Mahajan

Reputation: 264

Yes, I think the library you are using is not compatible with 64 bit version but you can solve the problem -

Just navigate to Build Settings>Architectures & replace $(ARCHS_STANDARD) to $(ARCHS_STANDARD_32_BIT)

So that your xcode build your project with 32 bit supported version.

Upvotes: 4

Hemanshu Liya
Hemanshu Liya

Reputation: 611

I solved the same issue by going to Xcode Build Settings and in Architectures, I changed the Xcode 6.1.1 standard architecture to:-

$(ARCHS_STANDARD_32_BIT)

Upvotes: 1

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