Welcome to LQ.
$ man nm ( http://unixhelp.ed.ac.uk/CGI/man-cgi?nm
-l : If
line number information can be found,
print it after the other symbol information.
I.e. no such information, unless the code is compiled with [ -g ] :
"" § 5. Normally, an executable file does not contain any references
to the original program source code ...
... GCC provides the -g debug option to store additional
debugging information in object files and executables. ""