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/* because people like to make things difficult */
#undef do_clone
#define crappy_sizeof(s) (s == NULL ? 0 : sizeof(s))
#if defined __ia64__
# define do_clone(fn, stack, flags, arg) \
__clone2(fn, stack, crappy_sizeof(stack), flags, arg, NULL, NULL, NULL)
#elif defined __hppa__
# define do_clone(fn, stack, flags, arg) \
clone(fn, stack, flags, arg)
#else
# define do_clone(fn, stack, flags, arg) \
clone(fn, stack+crappy_sizeof(stack), flags, arg)
#endif
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