Problem about getopt.c

I've send a mail talking about problem about getopt.c, and I will
describe it a litter clear here.

I want to trace source code of _getopt_internal() in getopt.c, so I
try to make a breakpoint on _getopt_internal, but gdb tell me there is
no such symbol and breakpoint set failed, so, I try to set breakpoint
as filename:linenum, but I cannot get getopt.c, gdb tell me no such
file. I set the directiory, no effect. And then, I use nm tool of UNIX
to check libiberty.a, which getopt.o will be merged into. And I get
this:

/////////////////////////////////////////
getopt.o:

getopt1.o:

getpwd.o:
                 U __errno_location
0000000000000008 b failure_errno.3486
                 U free
                 U getcwd
                 U getenv
0000000000000000 T getpwd
0000000000000000 b pwd.3485
                 U stat
                 U xmalloc
/////////////////////////////////////////

Nothing there in getopt.o and getopt1.o, it is so strange to me.
What's more, I write a printf() in the beginning of
_getopt_internal(), and make clean && make && make install, but there
is no printing message.

Did I miss something?