mem_leak_objc.m

// Save as mem_leak_objc.m and compile with:
//   gcc -o mem_leak_objc mem_leak_objc.m -lobjc -framework Foundation

#import <Foundation/Foundation.h>
#import <stdio.h>  // for printf and friends
#import <stdarg.h> // for va_list and va_start

void P(NSString *fmt, ...) {
    va_list va;
    va_start(va, fmt);

    NSAutoreleasePool *tempPool = [NSAutoreleasePool new];

    NSString *formatted = [[NSString alloc]
        initWithFormat:fmt arguments:va];
    printf("%s", [formatted UTF8String]); // printf issues warning if I pass it just the string
    [formatted release];
    printf("\n");

    [tempPool release];
}

int main() {
    NSAutoreleasePool *pool = [NSAutoreleasePool new];

    int i;
    for(i = 0; i < 1000000000; ++ i) {
        P(@"No longer leaking %@!", @"memory");
    }

    [pool release];
    return 0;
}