#StackBounty: #c++ #ios #xcode #static-libraries Undefined symbols for architecture arm64 after linking a static library in iOS app

Bounty: 50

I am creating a sample static library to be used in my iOS app, however, when calling the static library’s methods, I ran into a linker error:

Undefined symbols for architecture arm64:
"_doMath", referenced from:
  _doMathInterface in libTestMain.a(Test.o)
 (maybe you meant: _doMathInterface)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Here is the static library’s structure:

I have a header file Test.h:

#import <Foundation/Foundation.h>

@interface Test : NSObject

int doMathInterface(int a, int b);


and its implementation Test.m :

#import "Test.h"
#include "PaymentAPI.h"

@implementation Test

int doMathInterface(int a, int b){
    return doMath(a, b);


and in PaymentAPI.h:

#ifndef PaymentAPI_h
#define PaymentAPI_h

int doMath(int a, int b);

#endif /* PaymentAPI_h */

Finally in PaymentAPI.cpp:

#include <stdio.h>
#include "PaymentAPI.h"

int doMath(int a, int b){
    return a + b;

As you can see it’s a very simple static library but I couldn’t figure out why this linker error is happening, I have added the static library in the "Link Binaries with Libraries" in Build Phases in the app.

Here is a screenshot of the app‘s files:

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and search paths configuration in build settings is also correct, I believe:

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Here is a screenshot of some build settings for the static library project

Build Phases:
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Thanks a lot.

Get this bounty!!!

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