diff --git a/uppsrc/Core/CharSet.cpp b/uppsrc/Core/CharSet.cpp
index a6839e385..9bf5b1d34 100644
--- a/uppsrc/Core/CharSet.cpp
+++ b/uppsrc/Core/CharSet.cpp
@@ -1784,6 +1784,7 @@ inline void CharSetData::FromUnicode(char *t, const wchar *s, const wchar *end,
 }
 
 CharSetData::CharSetData()
+	:table(NULL)
 {
 	for(int i = 0; i < 16; i++)
 		line[i] = 0;
diff --git a/uppsrc/Core/CoWork.cpp b/uppsrc/Core/CoWork.cpp
index 08f7c5411..29da9dc68 100644
--- a/uppsrc/Core/CoWork.cpp
+++ b/uppsrc/Core/CoWork.cpp
@@ -362,6 +362,7 @@ int CoWork::GetWorkerIndex()
 }
 
 CoWork::CoWork()
+	:looper_count(1)
 {
 	LLOG("CoWork constructed " << FormatHex(this));
 	todo = 0;
diff --git a/uppsrc/Core/Inet.h b/uppsrc/Core/Inet.h
index 3e475026e..413a11250 100644
--- a/uppsrc/Core/Inet.h
+++ b/uppsrc/Core/Inet.h
@@ -34,11 +34,11 @@ String MIMEToFileExt(const String& mime);
 class IpAddrInfo {
 	enum { COUNT = 128 };
 	struct Entry {
-		const char *host;
-		const char *port;
-		int         family;
-		int         status;
-		addrinfo   *addr;
+		const char   *host;
+		const char   *port;
+		int           family;
+		int volatile  status;
+		addrinfo     *addr;
 	};
 	static Entry     pool[COUNT];
 	
diff --git a/uppsrc/Core/LangInfo.cpp b/uppsrc/Core/LangInfo.cpp
index 3fdef5001..deffecea5 100644
--- a/uppsrc/Core/LangInfo.cpp
+++ b/uppsrc/Core/LangInfo.cpp
@@ -236,6 +236,7 @@ LCID GetLanguageLCID(int language)
 #endif
 
 LanguageInfo::LanguageInfo()
+	:language(0)
 {
 	getindexletter = DefaultGetIndexLetter;
 	compare = DefaultLanguageCompare;
diff --git a/uppsrc/Core/LocalProcess.h b/uppsrc/Core/LocalProcess.h
index b000da837..e8612041a 100644
--- a/uppsrc/Core/LocalProcess.h
+++ b/uppsrc/Core/LocalProcess.h
@@ -85,7 +85,7 @@ public:
 	LocalProcess()                                                                          { Init(); }
 	LocalProcess(const char *cmdline, const char *envptr = NULL)                            { Init(); Start(cmdline, envptr); }
 	LocalProcess(const char *cmdline, const Vector<String>& arg, const char *envptr = NULL) { Init(); Start(cmdline, arg, envptr); }
-	virtual ~LocalProcess()                                                                 { Kill(); }
+	virtual ~LocalProcess()                                                                 { LocalProcess::Kill(); }
 };
 
 int    Sys(const char *cmdline, String& out, bool convertcharset = true);
diff --git a/uppsrc/Core/Mem.h b/uppsrc/Core/Mem.h
index b57dba5b4..b63f9a1aa 100644
--- a/uppsrc/Core/Mem.h
+++ b/uppsrc/Core/Mem.h
@@ -313,7 +313,7 @@ bool memeq8__(const void *p, const void *q, size_t count)
 	
 	auto Cmp128 = [&](size_t at)        { return i16x8(s + at) == i16x8(t + at); };
 	
-	if(!AllTrue(Cmp128(count - 16) & Cmp128(0))) // tail & alignment, also <= 32
+	if(  !AllTrue( Cmp128(count - 16) & Cmp128(0) )  ) // tail & alignment, also <= 32
 		return false;
 	
 	if(count <= 32)
diff --git a/uppsrc/Core/Parser.h b/uppsrc/Core/Parser.h
index 084697e5d..4db3155f3 100644
--- a/uppsrc/Core/Parser.h
+++ b/uppsrc/Core/Parser.h
@@ -80,7 +80,7 @@ public:
 		
 		int GetColumn(int tabsize = 4) const;
 
-		Pos(const char *ptr = NULL, int line = 1, String fn = Null) : ptr(ptr), line(line), fn(fn) {}
+		Pos(const char *ptr = NULL, int line = 1, String fn = Null) : ptr(ptr), line(line), fn(fn), wspc(NULL), lineptr(NULL) {}
 	};
 
 	const char *GetPtr() const                { return (const char *)term; }
diff --git a/uppsrc/Core/Path.cpp b/uppsrc/Core/Path.cpp
index edfa2afe4..5f620f46b 100644
--- a/uppsrc/Core/Path.cpp
+++ b/uppsrc/Core/Path.cpp
@@ -920,6 +920,7 @@ FileSystemInfo::FileInfo::FileInfo()
 	, is_folder(false), is_file(false), is_symlink(false), is_archive(false)
 	, is_compressed(false), is_hidden(false), is_read_only(false), is_system(false)
 	, is_temporary(false), root_style(ROOT_NO_ROOT_DIR)
+	, unix_mode(0)
 {}
 
 FileSystemInfo& StdFileSystemInfo()
diff --git a/uppsrc/Core/Path.h b/uppsrc/Core/Path.h
index df6cd61e8..e0dcc7bdd 100644
--- a/uppsrc/Core/Path.h
+++ b/uppsrc/Core/Path.h
@@ -180,7 +180,7 @@ public:
 	Iterator begin() { Iterator h; h.ff = *this ? this : nullptr; return h; }
 	Iterator end()   { Iterator h; h.ff = nullptr; return h; }
 
-	FindFile()                            { file = false; dir = NULL; }
+	FindFile()                            :statis(false) { file = false; dir = NULL; }
 	FindFile(const char *name);
 	~FindFile()                           { Close(); }
 };
diff --git a/uppsrc/Core/SHA1.cpp b/uppsrc/Core/SHA1.cpp
index 2500fd14c..ec7683e70 100644
--- a/uppsrc/Core/SHA1.cpp
+++ b/uppsrc/Core/SHA1.cpp
@@ -157,7 +157,10 @@ void SHA1Transform(uint32_t state[5], const unsigned char buffer[64])
     state[4] += e;
     /* Wipe variables */
     a = b = c = d = e = 0;
-    memset(block, '\0', sizeof(block));
+    
+    char *bl = reinterpret_cast<char *>(&block[0]);
+    for (int c=sizeof(block); c--; ++bl)
+		*bl = 0;
 }
 
 /* SHA1Init - Initialize new context */
diff --git a/uppsrc/Core/Stream.cpp b/uppsrc/Core/Stream.cpp
index 92e9df196..5b61853ac 100644
--- a/uppsrc/Core/Stream.cpp
+++ b/uppsrc/Core/Stream.cpp
@@ -76,7 +76,7 @@ void Stream::Close() {}
 
 void Stream::Flush() {}
 
-Stream::Stream() {
+Stream::Stream() :errorcode(0) {
 	pos = style = 0;
 	buffer = NULL;
 	ptr = rdlim = wrlim = NULL;
diff --git a/uppsrc/Core/Stream.h b/uppsrc/Core/Stream.h
index e0a02240c..70e75d086 100644
--- a/uppsrc/Core/Stream.h
+++ b/uppsrc/Core/Stream.h
@@ -535,7 +535,7 @@ private:
 
 public:
 	TeeStream(Stream& a, Stream& b) : a(a), b(b) {}
-	~TeeStream()                                 { Close(); }
+	~TeeStream()                                 { TeeStream::Close(); }
 };
 
 class FileMapping
diff --git a/uppsrc/Core/Value.cpp b/uppsrc/Core/Value.cpp
index 9cefd47b8..870f4a339 100644
--- a/uppsrc/Core/Value.cpp
+++ b/uppsrc/Core/Value.cpp
@@ -340,7 +340,7 @@ INITBLOCK {
 
 void Value::Serialize(Stream& s) {
 	RegisterStd();
-	dword type;
+	dword type = 0;
 	if(s.IsLoading()) {
 		s / type;
 		if(type >= 0x8000000)
diff --git a/uppsrc/Core/Value.h b/uppsrc/Core/Value.h
index f630b5668..863b49bc8 100644
--- a/uppsrc/Core/Value.h
+++ b/uppsrc/Core/Value.h
@@ -135,8 +135,8 @@ protected:
 	Void    *&ptr()                  { ASSERT(IsRef()); return *(Void **)&data; }
 	Void     *ptr() const            { ASSERT(IsRef()); return *(Void **)&data; }
 
-	void     SetRefType(dword type)  { ASSERT(IsRef()); ((int *)&data)[2] = type; }
-	dword    GetRefType() const      { ASSERT(IsRef()); return ((int *)&data)[2]; }
+	void     SetRefType(dword type)  { ASSERT(IsRef() && data.GetLength() >= 3*sizeof(int)); ((int *)&data)[2] = type; }
+	dword    GetRefType() const      { ASSERT(IsRef() && data.GetLength() >= 3*sizeof(int)); return ((int *)&data)[2]; }
 
 	bool     IsString() const          { return !data.IsSpecial(); }
 	bool     Is(byte v) const          { return data.IsSpecial(v); }
diff --git a/uppsrc/Core/Vcont.h b/uppsrc/Core/Vcont.h
index b2be51014..f92168624 100644
--- a/uppsrc/Core/Vcont.h
+++ b/uppsrc/Core/Vcont.h
@@ -309,7 +309,7 @@ public:
 	T&       DoIndex(int i, const T& x) { return At(i, x); }
 	T&       AddPick(T&& x)             { return items < alloc ? *(::new(Rdd()) T(pick(x))) : GrowAdd(pick(x)); }
 	int      GetIndex(const T& item) const;
-	T&       InsertPick(int i, T&& x)   { Insert(i, pick(x)); }
+	void     InsertPick(int i, T&& x)   { Insert(i, pick(x)); }
 	void     InsertPick(int i, Vector&& x) { Insert(i, pick(x)); }
 	void     AppendPick(Vector&& x)                { InsertPick(GetCount(), pick(x)); }
 	typedef T       *Iterator;
diff --git a/uppsrc/Core/z.h b/uppsrc/Core/z.h
index 39cdc3f99..70e255296 100644
--- a/uppsrc/Core/z.h
+++ b/uppsrc/Core/z.h
@@ -94,7 +94,7 @@ public:
 
 	ZCompressStream()                      {}
 	ZCompressStream(Stream& out)           { Open(out); }
-	~ZCompressStream()                     { Close(); }
+	~ZCompressStream()                     { ZCompressStream::Close(); }
 };
 
 class ZDecompressStream : public InFilterStream {
@@ -117,7 +117,7 @@ public:
 
 	ZDecompressStream()                    {}
 	ZDecompressStream(Stream& out)         { Open(out); }
-	~ZDecompressStream()                   { Close(); }
+	~ZDecompressStream()                   { ZDecompressStream::Close(); }
 };
 
 int64  CopyStream(Stream& dest, Stream& src, int64 count, Gate<int64, int64> progress, int chunk_size = 65536);
diff --git a/uppsrc/CppBase/Internal.h b/uppsrc/CppBase/Internal.h
index 3ba8e2c0c..3d61af5e2 100644
--- a/uppsrc/CppBase/Internal.h
+++ b/uppsrc/CppBase/Internal.h
@@ -12,7 +12,7 @@ const Index<String>&             GetNamespaceEndMacros();
 
 struct CppMacro : Moveable<CppMacro> {
 	String        param;
-	String        body;
+	String        body = "\x7f";
 	byte          md5[16];
 	
 	String Define(const char *s);
@@ -51,7 +51,7 @@ struct PPMacro : Moveable<PPMacro> {
 	void   Serialize(Stream& s) { s % macro % segment_id % line % undef_segment_id; }
 	String ToString() const     { return AsString(macro) + " " + AsString(segment_id); }
 	
-	PPMacro()                   { segment_id = undef_segment_id = 0; }
+	PPMacro()                   :macro(), line(0) { segment_id = undef_segment_id = 0; }
 };
 
 struct PPFile { // contains "macro extract" of file, only info about macros defined and namespaces
diff --git a/uppsrc/CppBase/cpplex.cpp b/uppsrc/CppBase/cpplex.cpp
index 7306767f8..1154779dc 100644
--- a/uppsrc/CppBase/cpplex.cpp
+++ b/uppsrc/CppBase/cpplex.cpp
@@ -83,6 +83,7 @@ void LexSymbolStat::Merge(const LexSymbolStat & other)
 
 Lex::Lex()
 :	statsCollected(false)
+,	ptr(NULL), pos(NULL), grounding(false)
 {
 	const char **cppk = CppKeyword();
 	for(int i = 0; cppk[i]; i++)