分段错误:1902 vfscanf.c:没有这样的文件或目录

Question

程序停止，scanf()函数出现分段错误。这是简化的代码：

int main() {
  int x = 0;
  printf("$ ");
  scanf("%i", x);
  return 0;
}

当我用gdb运行它时，我收到以下消息：

(gdb) run
Starting program: /home/siery/dev/shell/classes/bin/Recure 
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff71f6794 in _IO_vfscanf_internal (s=<optimized out>, format=<optimized out>, argptr=argptr@entry=0x7fffffffe608, errp=errp@entry=0x0) at vfscanf.c:1902
1902    vfscanf.c: No such file or directory.

我尝试在互联网上搜索vfscanf.c，但没有找到太多有用的信息。

顺便说一句。我用g++编译这个程序，它与gdb一样新更新。

Answer 1

scanf("%i", &x);
//          ^ THIS IS THE IMPORTANT BIT

---

GCC 甚至告诉你这一点：

foo.c: In function ‘main’:
foo.c:6:9: warning: format ‘%i’ expects argument of type ‘int *’, but argument 2 has type ‘int’ [-Wformat=]
   scanf("%i", x);
         ^

vfscanf.c: No such file or directory只是gdb抱怨找不到scanf的源代码。