diff --git a/src/music_gui.cpp b/src/music_gui.cpp
--- a/src/music_gui.cpp
+++ b/src/music_gui.cpp
@@ -592,7 +592,6 @@ struct MusicTrackSelectionWindow : publi
 				break;
 			default:
 				NOT_REACHED();
-				break;
 		}
 	}
 };
diff --git a/src/news_type.h b/src/news_type.h
--- a/src/news_type.h
+++ b/src/news_type.h
@@ -17,19 +17,6 @@
 #include "strings_type.h"
 #include "sound_type.h"
 
-/** Constants in the message options window. */
-enum MessageOptionsSpace {
-	MOS_WIDG_PER_SETTING      = 4,  ///< Number of widgets needed for each news category, starting at widget #WID_MO_START_OPTION.
-
-	MOS_LEFT_EDGE             = 6,  ///< Number of pixels between left edge of the window and the options buttons column.
-	MOS_COLUMN_SPACING        = 4,  ///< Number of pixels between the buttons and the description columns.
-	MOS_RIGHT_EDGE            = 6,  ///< Number of pixels between right edge of the window and the options descriptions column.
-	MOS_BUTTON_SPACE          = 10, ///< Additional space in the button with the option value (for better looks).
-
-	MOS_ABOVE_GLOBAL_SETTINGS = 6,  ///< Number of vertical pixels between the categories and the global options.
-	MOS_BOTTOM_EDGE           = 6,  ///< Number of pixels between bottom edge of the window and bottom of the global options.
-};
-
 /**
  * Type of news.
  */
diff --git a/src/rail_cmd.cpp b/src/rail_cmd.cpp
--- a/src/rail_cmd.cpp
+++ b/src/rail_cmd.cpp
@@ -2897,11 +2897,9 @@ int TicksToLeaveDepot(const Train *v)
 		case DIAGDIR_NE: return  ((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) - (length + 1)));
 		case DIAGDIR_SE: return -((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   + (length + 1)));
 		case DIAGDIR_SW: return -((int)(v->x_pos & 0x0F) - ((_fractcoords_enter[dir] & 0x0F) + (length + 1)));
-		default:
 		case DIAGDIR_NW: return  ((int)(v->y_pos & 0x0F) - ((_fractcoords_enter[dir] >> 4)   - (length + 1)));
+		default: NOT_REACHED();
 	}
-
-	return 0; // make compilers happy
 }
 
 /**
diff --git a/src/string.cpp b/src/string.cpp
--- a/src/string.cpp
+++ b/src/string.cpp
@@ -351,9 +351,8 @@ bool IsValidChar(WChar key, CharSetFilte
 		case CS_NUMERAL_SPACE: return (key >= '0' && key <= '9') || key == ' ';
 		case CS_ALPHA:         return IsPrintable(key) && !(key >= '0' && key <= '9');
 		case CS_HEXADECIMAL:   return (key >= '0' && key <= '9') || (key >= 'a' && key <= 'f') || (key >= 'A' && key <= 'F');
+		default: NOT_REACHED();
 	}
-
-	return false;
 }
 
 #ifdef WIN32
diff --git a/src/viewport.cpp b/src/viewport.cpp
--- a/src/viewport.cpp
+++ b/src/viewport.cpp
@@ -2445,7 +2445,6 @@ void UpdateTileSelection()
 					break;
 				default:
 					NOT_REACHED();
-					break;
 			}
 			_thd.new_pos.x = x1 & ~TILE_UNIT_MASK;
 			_thd.new_pos.y = y1 & ~TILE_UNIT_MASK;
diff --git a/src/water_cmd.cpp b/src/water_cmd.cpp
--- a/src/water_cmd.cpp
+++ b/src/water_cmd.cpp
@@ -895,7 +895,7 @@ static void GetTileDesc_Water(TileIndex 
 				case WATER_CLASS_SEA:   td->str = STR_LAI_WATER_DESCRIPTION_WATER; break;
 				case WATER_CLASS_CANAL: td->str = STR_LAI_WATER_DESCRIPTION_CANAL; break;
 				case WATER_CLASS_RIVER: td->str = STR_LAI_WATER_DESCRIPTION_RIVER; break;
-				default: NOT_REACHED(); break;
+				default: NOT_REACHED();
 			}
 			break;
 		case WATER_TILE_COAST: td->str = STR_LAI_WATER_DESCRIPTION_COAST_OR_RIVERBANK; break;
@@ -904,7 +904,7 @@ static void GetTileDesc_Water(TileIndex 
 			td->str = STR_LAI_WATER_DESCRIPTION_SHIP_DEPOT;
 			td->build_date = Depot::GetByTile(tile)->build_date;
 			break;
-		default: NOT_REACHED(); break;
+		default: NOT_REACHED();
 	}
 
 	td->owner[0] = GetTileOwner(tile);