Working towards -Wextra...

base/third_party/dmg_fp/mac_wextra.patch

+Index: g_fmt.cc
+===================================================================
+--- g_fmt.cc    (revision 49784)
++++ g_fmt.cc    (working copy)
+@@ -46,7 +46,7 @@
+        if (sign)
+                *b++ = '-';
+        if (decpt == 9999) /* Infinity or Nan */ {
+-               while((*b++ = *s++));
++               while((*b++ = *s++)) {}
+                goto done0;
+                }
+        if (decpt <= -4 || decpt > se - s + 5) {
+@@ -64,7 +64,7 @@
+                        }
+                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';
+@@ -79,7 +79,7 @@
+                *b++ = '.';
+                for(; decpt < 0; decpt++)
+                        *b++ = '0';
+-               while((*b++ = *s++));
++               while((*b++ = *s++)) {}
+                }
+        else {
+                while((*b = *s++)) {
+Index: dtoa.cc
+===================================================================
+--- dtoa.cc     (revision 49784)
++++ dtoa.cc     (working copy)
+@@ -3863,7 +3863,7 @@
+                                        if (dval(&u) > 0.5 + dval(&eps))
+                                                goto bump_up;
+                                        else if (dval(&u) < 0.5 - dval(&eps)) {
+-                                               while(*--s == '0');
++                                               while(*--s == '0') {}
+                                                s++;
+                                                goto ret1;
+                                                }
+@@ -4176,7 +4176,7 @@
+ #ifdef Honor_FLT_ROUNDS
+  trimzeros:
+ #endif
+-               while(*--s == '0');
++               while(*--s == '0') {}
+                s++;
+                }
+  ret: