* Add -Woverloaded-virtual

autotools/includes/depend.m4

@@ -11,7 +11,7 @@ num=`$CXX -dumpversion | sed "s/^\\\(.\\\).*/\\\1/"`
 if test $num -ge "3"; then
   CCDEPMODE=gcc3
 #  GCC3="-Wpadded -Wpacked -Wno-unused-parameter -Wmissing-format-attribute -Wdisabled-optimization"
-  GCC3="-W -Wno-unused-parameter -Wdisabled-optimization -Wno-write-strings -Wno-format-security -fno-strict-aliasing"
+  GCC3="-W -Wno-unused-parameter -Wdisabled-optimization -Wno-write-strings -Wno-format-security -fno-strict-aliasing -Woverloaded-virtual"
   GCC3DEB="-Wno-disabled-optimization -Wmissing-format-attribute"
 fi
 if test $num -ge "4"; then

configure

@@ -3840,7 +3840,7 @@ num=`$CXX -dumpversion | sed "s/^\\\(.\\\).*/\\\1/"`
 if test $num -ge "3"; then
   CCDEPMODE=gcc3
 #  GCC3="-Wpadded -Wpacked -Wno-unused-parameter -Wmissing-format-attribute -Wdisabled-optimization"
-  GCC3="-W -Wno-unused-parameter -Wdisabled-optimization -Wno-write-strings -Wno-format-security -fno-strict-aliasing"
+  GCC3="-W -Wno-unused-parameter -Wdisabled-optimization -Wno-write-strings -Wno-format-security -fno-strict-aliasing -Woverloaded-virtual"
   GCC3DEB="-Wno-disabled-optimization -Wmissing-format-attribute"
 fi
 if test $num -ge "4"; then