objdump.txt

test.o:     file format elf64-x86-64


Disassembly of section .text:

0000000000000000 <f>:
   0:	8d 47 01             	lea    0x1(%rdi),%eax
   3:	c3                   	retq   
   4:	66 66 2e 0f 1f 84 00 	data16 nopw %cs:0x0(%rax,%rax,1)
   b:	00 00 00 00 
   f:	90                   	nop

0000000000000010 <g>:
  10:	8d 47 01             	lea    0x1(%rdi),%eax
  13:	c3                   	retq   
  14:	66 66 2e 0f 1f 84 00 	data16 nopw %cs:0x0(%rax,%rax,1)
  1b:	00 00 00 00 
  1f:	90                   	nop

0000000000000020 <h>:
  20:	8d 47 01             	lea    0x1(%rdi),%eax
  23:	c3                   	retq   

test.cpp

extern "C" int f(int x) {
	x++;
	return x;
}

extern "C" int g(int x) {
	x += 1;
	return x;
}

extern "C" int h(int x) {
	x = x + 1;
	return x;
}