modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/20120105-1.c (about)

     1  struct __attribute__((packed)) S
     2  {
     3    int a, b, c;
     4  };
     5  
     6  static int __attribute__ ((noinline,noclone))
     7  extract(const char *p)
     8  {
     9    struct S s;
    10    __builtin_memcpy (&s, p, sizeof(struct S));
    11    return s.a;
    12  }
    13  
    14  volatile int i;
    15  
    16  int main (void)
    17  {
    18    char p[sizeof(struct S) + 1];
    19  
    20    __builtin_memset (p, 0, sizeof(struct S) + 1);
    21    i = extract (p + 1);
    22  
    23    return 0;
    24  }