[LLVMdev] Is this a bug in clang?

[Joe Armstrong]

Hello,

Is this a bug in clang, or a bug in my thinking?

/Joe Armstrong


/*

When I compile the following program I get different answers in clang and gcc.

  $ gcc bug2.c
  $ ./a.out
  j = 40
  $ clang bug2.c
  $ ./a.out
  j = 41

  I think the correct answer is 41. If my understanding of C is correct
  (which, or course, it might not be) the incremented value of i++ is
  first made available at the next sequence point, which is after the
  ';' at the end of the offending statment statement.

*/

int printf(const char * format, ...);

int main()
{
  int i, j;
  i = 10;
  j = i++ + 20 + i;
  printf("j = %d\n",j);
  return(0);
}