a.c

#include <stdio.h>
int main() {
    while (1) puts("whee");
}

a.s

	.file	"a.c"
	.section	.rodata
.LC0:
	.string	"whee"
	.text
	.globl	main
	.type	main, @function
main:
.LFB0:
	.cfi_startproc
	pushq	%rbp
	.cfi_def_cfa_offset 16
	.cfi_offset 6, -16
	movq	%rsp, %rbp
	.cfi_def_cfa_register 6
.L2:
	movl	$.LC0, %edi
	call	puts
	jmp	.L2
	.cfi_endproc
.LFE0:
	.size	main, .-main
	.ident	"GCC: (GNU) 4.9.3"
	.section	.note.GNU-stack,"",@progbits

ab.diff

--- a.s	2016-06-20 20:13:27.523667291 -0400
+++ b.s	2016-06-20 20:13:28.844667329 -0400
@@ -1,4 +1,4 @@
-	.file	"a.c"
+	.file	"b.c"
 	.section	.rodata
 .LC0:
 	.string	"whee"

b.c

#include <stdio.h>
int main() {
    for (;;) puts("whee");
}

b.s

	.file	"b.c"
	.section	.rodata
.LC0:
	.string	"whee"
	.text
	.globl	main
	.type	main, @function
main:
.LFB0:
	.cfi_startproc
	pushq	%rbp
	.cfi_def_cfa_offset 16
	.cfi_offset 6, -16
	movq	%rsp, %rbp
	.cfi_def_cfa_register 6
.L2:
	movl	$.LC0, %edi
	call	puts
	jmp	.L2
	.cfi_endproc
.LFE0:
	.size	main, .-main
	.ident	"GCC: (GNU) 4.9.3"
	.section	.note.GNU-stack,"",@progbits