Fix a bunch of clang warnings/errors.

base/third_party/dmg_fp/dtoa.cc

 /****************************************************************
  *
  * The author of this software is David M. Gay.
  *
  * Copyright (c) 1991, 2000, 2001 by Lucent Technologies.
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose without fee is hereby granted, provided that this entire notice
  * is included in all copies of any software which is or includes a copy
  * or modification of this software and in all copies of the supporting
@@ skipping 1541 matching lines @@
 #ifdef KR_headers
         (rvp, sp) U *rvp; CONST char **sp;
 #else
         (U *rvp, CONST char **sp)
 #endif
 {
         ULong c, x[2];
         CONST char *s;
         int c1, havedig, udx0, xshift;
 
-        if (!hexdig['0'])
+        if (!hexdig[(int)'0'])

[Mark Mentovai, 2010/09/21 18:40:01]

Edit README.chromium and provide a patch or modify an existing patch in this
directory.

[Evan Martin, 2010/09/21 18:52:20]

I intentionally didn't make this change when I did the original landing.  We
should probably just disable the warning until we understand why it's even
warning about this.

                 hexdig_init();
         x[0] = x[1] = 0;
         havedig = xshift = 0;
         udx0 = 1;
         s = *sp;
         /* allow optional initial 0x or 0X */
         while((c = *(CONST unsigned char*)(s+1)) && c <= ' ')
                 ++s;
         if (s[1] == '0' && (s[2] == 'x' || s[2] == 'X'))
                 s += 2;
@@ skipping 2627 matching lines @@
 #endif
         Bfree(b);
         *s = 0;
         *decpt = k + 1;
         if (rve)
                 *rve = s;
         return s0;
         }
 
 }  // namespace dmg_fp