modernc.org/cc@v1.0.1/testdata/gcc-6.3.0/gcc/testsuite/gcc.c-torture/execute/align-3.c (about)

     1  void func(void) __attribute__((aligned(256)));
     2  
     3  void func(void) 
     4  {
     5  }
     6  
     7  int main()
     8  {
     9    if (__alignof__(func) != 256)
    10      abort ();
    11    return 0;
    12  }