Index: boost/locale/utf.hpp
===================================================================
--- boost/locale/utf.hpp	(revision 84007)
+++ boost/locale/utf.hpp	(working copy)
@@ -222,6 +222,7 @@
                 if (!is_trail(tmp))
                     return illegal;
                 c = (c << 6) | ( tmp & 0x3F);
+                BOOST_FALLTHROUGH;
             case 2:
                 if(BOOST_LOCALE_UNLIKELY(p==e))
                     return incomplete;
@@ -229,6 +230,7 @@
                 if (!is_trail(tmp))
                     return illegal;
                 c = (c << 6) | ( tmp & 0x3F);
+                BOOST_FALLTHROUGH;
             case 1:
                 if(BOOST_LOCALE_UNLIKELY(p==e))
                     return incomplete;
@@ -272,8 +274,10 @@
             switch(trail_size) {
             case 3:
                 c = (c << 6) | ( static_cast<unsigned char>(*p++) & 0x3F);
+                BOOST_FALLTHROUGH;
             case 2:
                 c = (c << 6) | ( static_cast<unsigned char>(*p++) & 0x3F);
+                BOOST_FALLTHROUGH;
             case 1:
                 c = (c << 6) | ( static_cast<unsigned char>(*p++) & 0x3F);
             }
Index: libs/locale/src/util/gregorian.cpp
===================================================================
--- libs/locale/src/util/gregorian.cpp	(revision 84007)
+++ libs/locale/src/util/gregorian.cpp	(working copy)
@@ -207,7 +207,7 @@
                         value += (-value / 7) * 7 + 7;
                     // convert to local DOW
                     value = (value - 1 - first_day_of_week_ + 14) % 7 + 1;
-                    // fall throght
+                    BOOST_FALLTHROUGH;
                 case day_of_week_local:     ///< Local day of week, for example in France Monday is 1, in US Sunday is 1, [1..7]
                     normalize();
                     tm_updated_.tm_mday += (value - 1) - (tm_updated_.tm_wday - first_day_of_week_ + 7) % 7;
@@ -666,8 +666,9 @@
                             normalize();
                         }
                     }
+                    break;
                 default:
-                    ;
+                    break;
                 }
             }
 
@@ -726,7 +727,7 @@
                 case week_of_month:
                 case week_of_year:
                     factor = 7;
-                    // fall 
+                    BOOST_FALLTHROUGH;
                 case day:
                 case day_of_year:
                 case day_of_week:
Index: libs/locale/test/test_locale.hpp
===================================================================
--- libs/locale/test/test_locale.hpp	(revision 84007)
+++ libs/locale/test/test_locale.hpp	(working copy)
@@ -81,8 +81,10 @@
     switch(l) {
     case 3:
         c = (c << 6) | (((unsigned char)s[pos++]) & 0x3F);
+        BOOST_FALLTHROUGH;
     case 2:
         c = (c << 6) | (((unsigned char)s[pos++]) & 0x3F);
+        BOOST_FALLTHROUGH;
     case 1:
         c = (c << 6) | (((unsigned char)s[pos++]) & 0x3F);
     }