Undefined symbols for architecture x86_64:
"_crc32", referenced from:
+[QNCrc32 data:] in libPods-Qiniu.a(QNCrc32.o)
+[QNCrc32 file:error:] in libPods-Qiniu.a(QNCrc32.o)
ld: symbol(s) not found for architecture x86_64

报这个错，如果修改32位，不是最终的解决方案吧，应该支持64位的