#include <stdio.h> #if (defined _WIN32 || defined __APPLE__) && (!defined __TINYC__ || defined __leading_underscore)# define _ "_"#else# define _#endif #ifdef __clang__/* clang needs some help tp not throw functions away even at -O0 */#define __USED __attribute__((__used__))#else#define __USED#endif int x3(void){    printf(" x3");    return 3;} /* That callx4 is defined globally (as if ".globl callx4")   is a TCC extension.  GCC doesn't behave like this.  */void callx4(void);__asm__(_"callx4: call "_"x4; ret;"#ifndef __TINYC__    " .global "_"callx4"#endif); extern void x5(void); void callx5_again(void);void callx5_again(void){    x5();    asm("call "_"x6");} static void __USED x6(){    printf(" x6-2");}