GDB backtrace don't show function names on Mac

I was testing some things with gdb with this code (it's a wrong code, i use it just for testing purposes):

#import <Foundation/Foundation.h>

int main (int argc, char **argv)
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    int i = 1;  

    NSLog(@"Hi GDB, i is %@", i);

    [pool release];
    return 0;
}

Then i compile it : gcc -Wall -g -framework Foundation testGdb.m -o testGdb, and i run it:

gdb ./a.out 
GNU gdb 6.3.50-20050815 (Apple version gdb-1518) (Sat Feb 12 02:52:12 UTC 2011)
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This GDB was configured as "x86_64-apple-darwin"...Reading symbols for shared libraries ..... done

(gdb) run
Starting program: /Users/Tarek/Desktop/a.out 
Reading symbols for shared libraries .++++....................... done

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x000000000000002a
0x00007fff82d7a0a3 in开发者_如何学Python objc_msgSend_fixup ()
(gdb) bt
#0  0x00007fff82d7a0a3 in objc_msgSend_fixup ()
#1  0x0000000000000000 in ?? ()

(gdb)

The strange thing is that ther's no name in (#1), the correct output would normally print NSLog(the cause of the crash) and main.

Thanks for helping to understand this strange behavior.

---

This answer is most likely applicable here as well.

Debug symbols have nothing to do with the problem -- GDB can unwind stack just fine without them (only unwind descriptors are necessary).