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Compilation

The next step after preprocessing is compilation. This phase involves syntax validation, optimization and generation of assembly code. The "gcc" compiler can be instructed to generate only the assembly phase using the "-S" option. The resulting file is an assembly file with ".s" extension

$ gcc -S area.i

This generates a file area.s conatining the following assembly code

.file   "area.c"
.version        "01.01"
gcc2_compiled.:
.section        .rodata
.align 32
.LC0:
.string "Area of Square with side %d is %d"
.text
.align 4
.globl main
.type    main,@function
main:
pushl   %ebp
movl    %esp, %ebp
subl    $8, %esp
movl    $3, -4(%ebp)
subl    $4, %esp
movl    -4(%ebp), %eax
imull   -4(%ebp), %eax
pushl   %eax
pushl   -4(%ebp)
pushl   $.LC0
call    printf
addl    $16, %esp
movl    $0, %eax
leave
ret
.Lfe1:
.size    main,.Lfe1-main
.ident  "GCC: (GNU) 2.96 20000731 (Red Hat Linux 7.1 2.96-98)"
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