Compiling Objective-C code on mac terminal

Question

I have just started learning Objective-C and I am stuck on a very simple issue. I have written a small program and trying to compile it through Mac terminal by using following command:

clang -framework Foundation main.m -o prog

It was working fine until I wrote the following code in main.m

Calculator *calculator = [[Calculator alloc]initWithExpression:expressionArray];

It has started giving me following error:

Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_Calculator", referenced from:
      objc-class-ref in main-a39d3a.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

How to tell compiler to import calculator.h file although I have included the following line in main.m:

#import "Calculator.h"

You need to include Calculator.m on the compile line so it gets linked with main.m. — rmaddy
– rmaddy, Commented Mar 26, 2016 at 2:02

cwschmidt · Accepted Answer · 2016-03-26 02:06:03Z

6

If you have a file 'Calculator.m' in your sources, your compile command must look like

clang -framework Foundation Calculator.m main.m -o prog

answered Mar 26, 2016 at 2:06

cwschmidt

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