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Message: [QUOTE="=?iso-2022-kr?q?Harald_van_D=0E=29=26=0Fk?=, post: 3052922"] By only using the execution path that calls strlen when the argument is a constant. The as-if rule allows the argument to be evaluated multiple times, so long as a correct program cannot tell the difference. Reformatted a bit for readabiliy, it looks like this: #define strcpy(dest, src) \ (__extension__ (__builtin_constant_p (src) \ ? (__string2_1bptr_p (src) \ && strlen (src) + 1 <= 8 \ ? __strcpy_small (dest, \ __strcpy_args (src), \ strlen (src) + 1) \ : (char *) memcpy (dest, src, \ strlen (src) + 1)) \ : strcpy (dest, src))) [/QUOTE]