Working towards -Wextra...

base/third_party/dmg_fp/g_fmt.cc

 /****************************************************************
  *
  * The author of this software is David M. Gay.
  *
  * Copyright (c) 1991, 1996 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 28 matching lines @@
         if (!x) {
                 *b++ = '0';
                 *b = 0;
                 goto done;
                 }
 #endif
         s = s0 = dtoa(x, 0, 0, &decpt, &sign, &se);
         if (sign)
                 *b++ = '-';
         if (decpt == 9999) /* Infinity or Nan */ {
-                while((*b++ = *s++));
+                while((*b++ = *s++)) {}
                 goto done0;
                 }
         if (decpt <= -4 || decpt > se - s + 5) {
                 *b++ = *s++;
                 if (*s) {
                         *b++ = '.';
                         while((*b = *s++))
                                 b++;
                         }
                 *b++ = 'e';
                 /* sprintf(b, "%+.2d", decpt - 1); */
                 if (--decpt < 0) {
                         *b++ = '-';
                         decpt = -decpt;
                         }
                 else
                         *b++ = '+';
-                for(j = 2, k = 10; 10*k <= decpt; j++, k *= 10);
+                for(j = 2, k = 10; 10*k <= decpt; j++, k *= 10) {}
                 for(;;) {
                         i = decpt / k;
                         *b++ = i + '0';
                         if (--j <= 0)
                                 break;
                         decpt -= i*k;
                         decpt *= 10;
                         }
                 *b = 0;
                 }
         else if (decpt <= 0) {
                 *b++ = '.';
                 for(; decpt < 0; decpt++)
                         *b++ = '0';
-                while((*b++ = *s++));
+                while((*b++ = *s++)) {}
                 }
         else {
                 while((*b = *s++)) {
                         b++;
                         if (--decpt == 0 && *s)
                                 *b++ = '.';
                         }
                 for(; decpt > 0; decpt--)
                         *b++ = '0';
                 *b = 0;
                 }
  done0:
         freedtoa(s0);
 #ifdef IGNORE_ZERO_SIGN
  done:
 #endif
         return b0;
         }
 
 }  // namespace dmg_fp