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iPhone SDK linking errors with static library

Answer 1

+1 A:

Have you added the library as a dependency to the project? See http://stackoverflow.com/questions/87979/beginner-question-about-xcode-3-1-1-and-static-libraries#88583

If you drill down into your target, does the library name appear in the "Link binary with libraries" group?

Look at the log for the compiler/linker output. Find the call to the linker. Does your library appear on the list of static libraries to link in?

Shaggy Frog 2010-05-29 00:23:32

Thanks for your answer!Yes, the library is a dependency for the project.Yes, the library name is in the "Link binary with libraries" group.Yes, as a matter of fact, the linker call is in the pastie above.

Nico 2010-05-31 15:05:49

Answer 2

+1 A:

Have you solve the problem ?

I am using a .a library and i have a similar problem while linking my project files :

Undefined symbols:
"_OBJC_CLASS_$_SUPMessageClient", referenced from:
  objc-class-ref-to-SUPMessageClient in SUPWorkFlowsAppDelegate.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

In the linker log, I can see my -l.

Any idea ?

spawnrider 2010-08-11 17:16:00

Sorry, unfortunately, I couldn't solve the issue, other than falling back to an older version of my library. Since then, I haven't been able to look back into the issue, but, now that you've brought it back, I may take a look at it again.

Nico 2010-08-13 02:52:42

Answer 3

+1 A:

I just encountered the same linker error. I discovered through trial and error that it was because I was invoking isKindOfClass. I'm not sure why this causes the linker to barf, but hopefully this information helps out.

The class in question, OrderItem, is a child of NSManagedObject; in other words, it's an automatically-generated Core Data entity class.

Specifically, here was the linker error:

"_OBJC_CLASS_$_OrderItem", referenced from:
objc-class-ref-to-OrderItem in libmyStaticLib.a(MyTableViewController.o)
ld: symbol(s) not found
collect2: ld returned 1 exit status

And here was the offending code:

- (void)handleButtonTapWithObject:(id)object
{
    // This must be an OrderItem or else we don't want to touch it:
    if ( NO == [object isKindOfClass:[OrderItem class]] ) // <-- OFFENDING CODE
    {
        NSLog(@"Object parameter is of unexpected type.");
        return;
    }

My workaround was simply to omit the test that ensures 'object' is an OrderItem. The code is not as secure without this test, but the linker error went away. I'd be curious to know if I am going about this test wrong, and perhaps there is a better way of doing this.

Jeffro 2010-08-24 21:14:40

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iPhone SDK linking errors with static library

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