include/archive.h:17: warning: integer overflow in expression
Only shown on big endian architectures. Probably best to replace
17 XZ_MAGIC1a = ((0xfd * 256 + '7') * 256 + 'z') * 256 + 'X',
with XZ_MAGIC1a = 0xFD377A58UL directly instead.
The little endian case is probably fine because 0xFD has bit7 on, 'X' off.
参考：http://mobile.google.com/group/linux.debian.maint.boot/msg/6541be32f1c6679a?dmode=source