Hi mmkider,
you should use this command in a post-build step like
cmd /c arm-elf-nm -s ....
What is your intension? Do you want to get the symbols from the object files or the resulting executable.
Keep in mind that in a final link pass the address of symbols (resulting executable) may differ from the address in the single object files, since the object files contain relocation information which is resolved by the linker and the corresponding linker description file.