diff --git a/Makefile b/Makefile
index eba6fef..4532fa1 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,10 @@
+# Extended C++ warning policy
+CXXFLAGS += -Werror -Wall -Wextra -Wshadow -Wpedantic -Wformat-nonliteral \
+            -Wformat-security -Wswitch-default -Wuninitialized -Wundef \
+            -Wpointer-arith -Woverloaded-virtual -Wctor-dtor-privacy \
+            -Wnon-virtual-dtor -Woverloaded-virtual -Wsign-promo \
+            -Wno-unused-parameter -Weffc++
+
 all: xmltest staticlib
 
 rebuild: clean all
diff --git a/tinyxml2.cpp b/tinyxml2.cpp
index dcf2a43..953debf 100755
--- a/tinyxml2.cpp
+++ b/tinyxml2.cpp
@@ -741,6 +741,7 @@ bool XMLDocument::Accept( XMLVisitor* visitor ) const
 XMLNode::XMLNode( XMLDocument* doc ) :
     _document( doc ),
     _parent( 0 ),
+    _value(),
     _parseLineNum( 0 ),
     _firstChild( 0 ), _lastChild( 0 ),
     _prev( 0 ), _next( 0 ),
@@ -2000,9 +2001,16 @@ XMLDocument::XMLDocument( bool processEntities, Whitespace whitespaceMode ) :
     _processEntities( processEntities ),
     _errorID(XML_SUCCESS),
     _whitespaceMode( whitespaceMode ),
+    _errorStr1(),
+    _errorStr2(),
     _errorLineNum( 0 ),
     _charBuffer( 0 ),
-    _parseCurLineNum( 0 )
+    _parseCurLineNum( 0 ),
+    _unlinked(),
+    _elementPool(),
+    _attributePool(),
+    _textPool(),
+    _commentPool()
 {
     // avoid VC++ C4355 warning about 'this' in initializer list (C4355 is off by default in VS2012+)
     _document = this;
@@ -2374,12 +2382,14 @@ void XMLDocument::Parse()
 
 XMLPrinter::XMLPrinter( FILE* file, bool compact, int depth ) :
     _elementJustOpened( false ),
+    _stack(),
     _firstElement( true ),
     _fp( file ),
     _depth( depth ),
     _textDepth( -1 ),
     _processEntities( true ),
-    _compactMode( compact )
+    _compactMode( compact ),
+    _buffer()
 {
     for( int i=0; i<ENTITY_RANGE; ++i ) {
         _entityFlag[i] = false;
diff --git a/tinyxml2.h b/tinyxml2.h
index 7b5bb0e..9774118 100755
--- a/tinyxml2.h
+++ b/tinyxml2.h
@@ -192,10 +192,11 @@ template <class T, int INITIAL_SIZE>
 class DynArray
 {
 public:
-    DynArray() {
-        _mem = _pool;
-        _allocated = INITIAL_SIZE;
-        _size = 0;
+    DynArray() :
+        _mem( _pool ),
+        _allocated( INITIAL_SIZE ),
+        _size( 0 )
+    {
     }
 
     ~DynArray() {
@@ -333,7 +334,7 @@ template< int ITEM_SIZE >
 class MemPoolT : public MemPool
 {
 public:
-    MemPoolT() : _root(0), _currentAllocs(0), _nAllocs(0), _maxAllocs(0), _nUntracked(0)	{}
+    MemPoolT() : _blockPtrs(), _root(0), _currentAllocs(0), _nAllocs(0), _maxAllocs(0), _nUntracked(0)	{}
     ~MemPoolT() {
         Clear();
     }
@@ -1211,7 +1212,7 @@ public:
 private:
     enum { BUF_SIZE = 200 };
 
-    XMLAttribute() : _parseLineNum( 0 ), _next( 0 ), _memPool( 0 ) {}
+    XMLAttribute() : _name(), _value(),_parseLineNum( 0 ), _next( 0 ), _memPool( 0 ) {}
     virtual ~XMLAttribute()	{}
 
     XMLAttribute( const XMLAttribute& );	// not supported
@@ -1947,16 +1948,13 @@ class TINYXML2_LIB XMLHandle
 {
 public:
     /// Create a handle from any node (at any depth of the tree.) This can be a null pointer.
-    XMLHandle( XMLNode* node )												{
-        _node = node;
+    XMLHandle( XMLNode* node ) : _node( node ) {
     }
     /// Create a handle from a node.
-    XMLHandle( XMLNode& node )												{
-        _node = &node;
+    XMLHandle( XMLNode& node ) : _node( &node ) {
     }
     /// Copy constructor
-    XMLHandle( const XMLHandle& ref )										{
-        _node = ref._node;
+    XMLHandle( const XMLHandle& ref ) : _node( ref._node ) {
     }
     /// Assignment
     XMLHandle& operator=( const XMLHandle& ref )							{
@@ -2030,14 +2028,11 @@ private:
 class TINYXML2_LIB XMLConstHandle
 {
 public:
-    XMLConstHandle( const XMLNode* node )											{
-        _node = node;
+    XMLConstHandle( const XMLNode* node ) : _node( node ) {
     }
-    XMLConstHandle( const XMLNode& node )											{
-        _node = &node;
+    XMLConstHandle( const XMLNode& node ) : _node( &node ) {
     }
-    XMLConstHandle( const XMLConstHandle& ref )										{
-        _node = ref._node;
+    XMLConstHandle( const XMLConstHandle& ref ) : _node( ref._node ) {
     }
 
     XMLConstHandle& operator=( const XMLConstHandle& ref )							{
@@ -2252,6 +2247,10 @@ private:
     bool _restrictedEntityFlag[ENTITY_RANGE];
 
     DynArray< char, 20 > _buffer;
+
+    // Prohibit cloning, intentionally not implemented
+    XMLPrinter( const XMLPrinter& );
+    XMLPrinter& operator=( const XMLPrinter& );
 };
 
 
diff --git a/xmltest.cpp b/xmltest.cpp
index d6f18ce..111db88 100644
--- a/xmltest.cpp
+++ b/xmltest.cpp
@@ -2067,6 +2067,8 @@ int main( int argc, const char ** argv )
     {
         struct TestUtil: XMLVisitor
         {
+            TestUtil() : str() {}
+
             void TestParseError(const char *testString, const char *docStr, XMLError expected_error, int expectedLine)
             {
                 XMLDocument doc;