Sequence of access to passes.c

[Ankit Mahanot]

Yes the flags are being set at some stage or in some file. I think I
found that file in the source code :

Filename - opts.c

The code that sets the optimization flags is as follows:

 /* Scan to see what optimization level has been specified.  That will
     determine the default value of many flags.  */
  for (i = 1; i < argc; i++)
    {
      if (!strcmp (argv[i], "-O"))
	{
	  optimize = 1;
	  optimize_size = 0;
	}
      else if (argv[i][0] == '-' && argv[i][1] == 'O')
	{
	  /* Handle -Os, -O2, -O3, -O69, ...  */
	  const char *p = &argv[i][2];

	  if ((p[0] == 's') && (p[1] == 0))
	    {
	      optimize_size = 1;

	      /* Optimizing for size forces optimize to be 2.  */
	      optimize = 2;
	    }
	  else
	    {
	      const int optimize_val = read_integral_parameter (p, p - 2, -1);
	      if (optimize_val != -1)
		{
		  optimize = optimize_val;
		  optimize_size = 0;
		}
	    }
	}
    }


I think now I can go on & see where to implement my algo :)

thanks everyone.