How to use the addr2line command in Linux?

I am trying to use addr2line command in Unix but everytime it is giving the same output as ??:0. I am giving command as addr2line -e a.out 0x4005BDC . I got this address while running this a.out executable with valgrind tool to find the memory leakage. I also compiled the source code with -g option.

How does addr2line work?

addr2line translates program addresses into file names and line numbers. Given an address and an executable, it uses the debugging information in the executable to figure out which file name and line number are associated with a given address. The executable to use is specified with the -e option.

You can also use gdb instead of addr2line to examine memory address. Load executable file in gdb and print the name of a symbol which is stored at the address. 16 Examining the Symbol Table.