duplicate symbols for architecture i386 clang

Question

I\'ve seen several posts on google and stackoverflow related to this error, I\'ve read all of them but still fetching the problem , I will be glad for a solution. Here is th

Answer 1

I imported files from another project, it had main.m file as well. So overall I had two main.m files, deleting one resolved the issue for me.

Answer 2

Just to add to the possible solutions.

In my case I had accidentally declared and initialized a variable in a header file.

For example this is wrong:

MyFile.h

#import <Foundation/Foundation.h>

NSInteger const ABCMyConstant = 6;

It should be:

MyFile.h

#import <Foundation/Foundation.h>

NSInteger const ABCMyConstant;

MyFile.m

#import "MyFile.h"

NSInteger const ABCMyConstant = 6;

Answer 3

I got this error when I had a static library included in the main project while also including a second library that also had a reference to the library. That's pretty confusing, so maybe this is clearer.

MyWorkspace + Main Project + Reference to library 1 + Reference to library 2 + Library 1 + Library 2 + Reference to library 1

I removed the reference to library 1 from the main project and the error went away.

Answer 4

I tried cleaning the project, erased all derived data. Nothing worked. Atlas, this worked for me.

Another reason can be that the project is targeted at a simulator instead of a real device when building a distribution-version. That also causes this error message.

Answer 5

I got the same error when setting up OCMock. I fixed it by add the libOCMock.a in 'Copy Files' section of Building Phase

Answer 6

I had this error after I copy & paste a test file into the project, forgetting to change the name of the interface and implementation lines:

@interface TDInputValidationsTests : XCTestCase

and

@implementation TDInputValidationsTests

Silly mistake... I also suggest looking at the "build phases" tab on the project to check for duplicates. Deleting the derived data and making a clean-build might help as well.