> gcc -c -std=c89 -pedantic -Wall main_square.c
> objdump -t main_square.o

main.o:     file format elf64-x86-64

SYMBOL TABLE:
0000000000000000 l    df *ABS*  0000000000000000 main.c
0000000000000000 l    d  .text  0000000000000000 .text
0000000000000000 l    d  .data  0000000000000000 .data
0000000000000000 l    d  .bss   0000000000000000 .bss
0000000000000000 l    d  .note.GNU-stack
0000000000000000 .note.GNU-stack
0000000000000000 l    d  .eh_frame
0000000000000000 .eh_frame
0000000000000000 l    d  .comment       
0000000000000000 .comment
0000000000000000 g     F .text  000000000000001c main
0000000000000000         *UND*  0000000000000000 square
