Follow-up Comment #3, patch #6418 (project avr-libc):
Rather than generating an error when an integer non-constant is passed the
non-exact macros could form a loop around a constant delay.
#define _delay_ms(__ms)
do {
if (!__builtin_constant_p(F_CPU)) {
_DELAY_EMIT_ERROR(__STRINGIFY(F_CPU)
" is not a constant for _delay_ms");
} else if (__builtin_constant_p(__ms)) {
_delay_f_ms(F_CPU, __ms);
} else if ((__typeof__((_ms) + 0))0.25 == 0) {
__typeof__((__ms) + 0) __ms2 = __ms;
while (__ms2--) _delay_f_ms(F_CPU, 1);
} else {
_DELAY_EMIT_ERROR(__STRINGIFY(__ms)
" is not a constant or integer for _delay_ms");
}
} while (0)
_______________________________________________________
Reply to this item at:
<http://savannah.nongnu.org/patch/?6418>
_______________________________________________
Message sent via/by Savannah
http://savannah.nongnu.org/
_______________________________________________
AVR-libc-dev mailing list
AVR-libc-dev@nongnu.org
http://lists.nongnu.org/mailman/listinfo/avr-libc-dev
