A compilation result of cast "const int *" into "int *"

ptr.c

#include <stdio.h>

void
f(int * p)
{
	*p = 2;
}

int
main(int argc, char * argv[])
{
	const int x = 1;
	f(&x);
	printf("%d\n", x);
	return 0;
}

ptr.s

	.file	"ptr.c"
	.text
	.p2align 4,,15
	.globl	f
	.type	f, @function
f:
.LFB11:
	.cfi_startproc
	movl	4(%esp), %eax
	movl	$2, (%eax)
	ret
	.cfi_endproc
.LFE11:
	.size	f, .-f
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%d\n"
	.section	.text.startup,"ax",@progbits
	.p2align 4,,15
	.globl	main
	.type	main, @function
main:
.LFB12:
	.cfi_startproc
	pushl	%ebp
	.cfi_def_cfa_offset 8
	.cfi_offset 5, -8
	movl	%esp, %ebp
	.cfi_def_cfa_register 5
	andl	$-16, %esp
	subl	$16, %esp
	movl	$2, 4(%esp)
	movl	$.LC0, (%esp)
	call	printf
	xorl	%eax, %eax
	leave
	.cfi_restore 5
	.cfi_def_cfa 4, 4
	ret
	.cfi_endproc
.LFE12:
	.size	main, .-main
	.ident	"GCC: (Debian 4.7.1-7) 4.7.1"
	.section	.note.GNU-stack,"",@progbits