Basic question: Just for debugging purposes, I'm trying to print out the 
address 
of a pointer to a struct, but I can't figure out the proper way to do it (ie, 
satisfy the compiler warnings). OSX 10.6.7, Xcode 3.2.6

    dispatch_source_t our_gcd_source;
    . . .
    printf("gcd_source: %08X\n",gcd_source);
warning: format '%08X' expects type 'unsigned int', but argument 2 has type 
'dispatch_source_t'
    . . .
    printf("gcd_source: %08X\n",(unsigned int)gcd_source);
warning: cast from pointer to integer of different size

Thx
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