1:调用CC1 my.c -o /tmp/ccLyyuOp.s
2：调用 as -o /tmp/ccxOun8F.o /tmp/ccLyyuOp.s
3：调用collect2 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o MM crt1.o ,crti.o ,crtbegin.o ,ccGtreEA.o ,mylib.o ,crtend.o crtn.o
