diff --git a/include/verilated_vcd_c.cpp b/include/verilated_vcd_c.cpp
index 9f3f5c72e..ff5ea45cc 100644
--- a/include/verilated_vcd_c.cpp
+++ b/include/verilated_vcd_c.cpp
@@ -569,7 +569,7 @@ void VerilatedVcd::declare (vluint32_t code, const char* name, const char* wirep
     sprintf(buf, " %2d ", bits);
     decl += buf;
     if (m_evcd) {
-	sprintf(buf, "<%d", code);
+        sprintf(buf, "<%u", code);
 	decl += buf;
     } else {
 	decl += stringCode(code);
diff --git a/src/V3Case.cpp b/src/V3Case.cpp
index 97bb08f30..1417f6d1e 100644
--- a/src/V3Case.cpp
+++ b/src/V3Case.cpp
@@ -166,7 +166,7 @@ private:
 	}
 	UINFO(8,"Simple case statement: "<<nodep<<endl);
 	// Zero list of items for each value
-	for (uint32_t i=0; i<(1UL<<m_caseWidth); i++) m_valueItem[i] = NULL;
+        for (uint32_t i=0; i<(1UL<<m_caseWidth); ++i) m_valueItem[i] = NULL;
 	// Now pick up the values for each assignment
 	// We can cheat and use uint32_t's because we only support narrow case's
 	bool bitched = false;
@@ -184,7 +184,7 @@ private:
 		    V3Number numval  (itemp->fileline(), iconstp->width());
 		    numval.opBitsOne(iconstp->num());
 		    uint32_t val  = numval.toUInt();
-		    for (uint32_t i=0; i<(1UL<<m_caseWidth); i++) {
+                    for (uint32_t i=0; i<(1UL<<m_caseWidth); ++i) {
 			if ((i & mask) == val) {
 			    if (!m_valueItem[i]) {
 				m_valueItem[i] = itemp;
@@ -199,12 +199,12 @@ private:
 	    }
 	    // Defaults were moved to last in the caseitem list by V3LinkDot
 	    if (itemp->isDefault()) {  // Case statement's default... Fill the table
-		for (uint32_t i=0; i<(1UL<<m_caseWidth); i++) {
+                for (uint32_t i=0; i<(1UL<<m_caseWidth); ++i) {
 		    if (!m_valueItem[i]) m_valueItem[i] = itemp;
 		}
 	    }
 	}
-	for (uint32_t i=0; i<(1UL<<m_caseWidth); i++) {
+        for (uint32_t i=0; i<(1UL<<m_caseWidth); ++i) {
 	    if (!m_valueItem[i]) {
 		nodep->v3warn(CASEINCOMPLETE,"Case values incompletely covered (example pattern 0x"<<hex<<i<<")");
 		m_caseNoOverlapsAllCovered = false;
@@ -278,7 +278,7 @@ private:
 	AstNode* cexprp = nodep->exprp()->unlinkFrBack();
 
 	if (debug()>=9) {
-	    for (uint32_t i=0; i<(1UL<<m_caseWidth); i++) {
+            for (uint32_t i=0; i<(1UL<<m_caseWidth); ++i) {
 		if (AstNode* itemp = m_valueItem[i]) {
 		    UINFO(9,"Value "<<hex<<i<<" "<<itemp<<endl);
 		}
diff --git a/src/V3Clock.cpp b/src/V3Clock.cpp
index dc2c6eaba..220a3a9a2 100644
--- a/src/V3Clock.cpp
+++ b/src/V3Clock.cpp
@@ -386,10 +386,13 @@ private:
 public:
     // CONSTUCTORS
     explicit ClockVisitor(AstNetlist* nodep) {
-	m_modp=NULL;
+        m_modp = NULL;
 	m_evalFuncp = NULL;
-	m_topScopep=NULL;
-	m_lastSenp=NULL;
+        m_initFuncp = NULL;
+        m_finalFuncp = NULL;
+        m_settleFuncp = NULL;
+        m_topScopep = NULL;
+        m_lastSenp = NULL;
 	m_lastIfp = NULL;
 	m_scopep = NULL;
 	//
diff --git a/src/V3Combine.cpp b/src/V3Combine.cpp
index 9d5344480..1c339d943 100644
--- a/src/V3Combine.cpp
+++ b/src/V3Combine.cpp
@@ -402,6 +402,7 @@ private:
 	UINFO(4," MOD   "<<nodep<<endl);
 	m_modp = nodep;
 	m_modNFuncs = 0;
+        m_walkLast2p = NULL;
 	m_hashed.clear();
 	// Compute hash of all statement trees in the function
 	m_state = STATE_HASH;
diff --git a/src/V3Coverage.cpp b/src/V3Coverage.cpp
index 414085dfd..3fd67c190 100644
--- a/src/V3Coverage.cpp
+++ b/src/V3Coverage.cpp
@@ -382,6 +382,7 @@ public:
     explicit CoverageVisitor(AstNetlist* rootp) {
 	// Operate on all modules
 	m_checkBlock = true;
+        m_modp = NULL;
 	m_beginHier = "";
 	m_inToggleOff = false;
 	m_inModOff = true;
diff --git a/src/V3Delayed.cpp b/src/V3Delayed.cpp
index 91c17134e..288209e34 100644
--- a/src/V3Delayed.cpp
+++ b/src/V3Delayed.cpp
@@ -119,7 +119,8 @@ private:
                           <<nodep->varp()->prettyName());
 	}
     }
-    AstVarScope* createVarSc(AstVarScope* oldvarscp, string name, int width/*0==fromoldvar*/, AstNodeDType* newdtypep) {
+    AstVarScope* createVarSc(AstVarScope* oldvarscp, const string& name,
+                             int width/*0==fromoldvar*/, AstNodeDType* newdtypep) {
 	// Because we've already scoped it, we may need to add both the AstVar and the AstVarScope
 	if (!oldvarscp->scopep()) oldvarscp->v3fatalSrc("Var unscoped");
 	AstVar* varp;
diff --git a/src/V3DepthBlock.cpp b/src/V3DepthBlock.cpp
index 42792f250..a201bb3c9 100644
--- a/src/V3DepthBlock.cpp
+++ b/src/V3DepthBlock.cpp
@@ -126,8 +126,10 @@ private:
 public:
     // CONSTUCTORS
     explicit DepthBlockVisitor(AstNetlist* nodep) {
-	m_modp=NULL;
-	m_depth=0;
+        m_modp = NULL;
+        m_funcp = NULL;
+        m_depth = 0;
+        m_deepNum = 0;
 	//
 	nodep->accept(*this);
     }
diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index 3a9f4c08e..7fd7b8c5d 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -993,7 +993,7 @@ class EmitCImp : EmitCStmts {
     // High level
     void emitImp(AstNodeModule* modp);
     void emitStaticDecl(AstNodeModule* modp);
-    void emitSettleLoop(std::string eval_call, bool initial);
+    void emitSettleLoop(const std::string& eval_call, bool initial);
     void emitWrapEval(AstNodeModule* modp);
     void emitInt(AstNodeModule* modp);
     void maybeSplit(AstNodeModule* modp);
@@ -1752,7 +1752,7 @@ void EmitCImp::emitSensitives() {
     }
 }
 
-void EmitCImp::emitSettleLoop(std::string eval_call, bool initial) {
+void EmitCImp::emitSettleLoop(const std::string& eval_call, bool initial) {
     putsDecoration("// Evaluate till stable\n");
     puts("int __VclockLoop = 0;\n");
     puts("QData __Vchange = 1;\n");
diff --git a/src/V3Expand.cpp b/src/V3Expand.cpp
index bff192936..d66e6157a 100644
--- a/src/V3Expand.cpp
+++ b/src/V3Expand.cpp
@@ -829,6 +829,8 @@ private:
 		    // Rather than doing a (slowish) ==##, we OR in the bits that aren't part of the mask
 		    eqp = new AstOr (nodep->fileline(),
 				     new AstConst (nodep->fileline(), notWideMask(nodep->lhsp())),
+                                     // Bug in cppcheck
+                                     // cppcheck-suppress memleak
 				     eqp);
 		}
 		newp = (newp==NULL) ? eqp : (new AstAnd (nodep->fileline(), newp, eqp));
diff --git a/src/V3Order.cpp b/src/V3Order.cpp
index 6950277ca..723dd15dd 100644
--- a/src/V3Order.cpp
+++ b/src/V3Order.cpp
@@ -1612,7 +1612,7 @@ void OrderVisitor::process() {
     UINFO(2,"  Process Circulars...\n");
     processCircular();  // must be before processDomains
 
-    // Assign logic verticesto new domains
+    // Assign logic vertices to new domains
     UINFO(2,"  Domains...\n");
     processDomains();
     m_graph.dumpDotFilePrefixed("orderg_domain");
diff --git a/src/V3Os.cpp b/src/V3Os.cpp
index fb39cd98b..55c65201b 100644
--- a/src/V3Os.cpp
+++ b/src/V3Os.cpp
@@ -211,9 +211,9 @@ uint64_t V3Os::memUsageBytes() {
     if (!fp) {
 	return 0;
     }
-    uint64_t size, resident, share, text, lib, data, dt;  // All in pages
-    if (7 != fscanf(fp, "%" VL_PRI64 "d %" VL_PRI64 "d %" VL_PRI64 "d %"
-		    VL_PRI64 "d %" VL_PRI64 "d %" VL_PRI64 "d %" VL_PRI64 "d",
+    vluint64_t size, resident, share, text, lib, data, dt;  // All in pages
+    if (7 != fscanf(fp, "%" VL_PRI64 "u %" VL_PRI64 "u %" VL_PRI64 "u %"
+                    VL_PRI64 "u %" VL_PRI64 "u %" VL_PRI64 "u %" VL_PRI64 "u",
 		    &size, &resident, &share, &text, &lib, &data, &dt)) {
 	fclose(fp);
 	return 0;
diff --git a/src/V3Task.cpp b/src/V3Task.cpp
index bd99f3133..9832b2d72 100644
--- a/src/V3Task.cpp
+++ b/src/V3Task.cpp
@@ -1258,7 +1258,9 @@ public:
 	m_modp = NULL;
 	m_topScopep = NULL;
 	m_scopep = NULL;
+        m_insMode = IM_BEFORE;
 	m_insStmtp = NULL;
+        m_modNCalls = 0;
 	AstNode::user1ClearTree();
 	nodep->accept(*this);
     }
diff --git a/src/V3Trace.cpp b/src/V3Trace.cpp
index 5f3abdaf5..35714c3a5 100644
--- a/src/V3Trace.cpp
+++ b/src/V3Trace.cpp
@@ -700,6 +700,8 @@ public:
 	m_chgSubFuncp = NULL;
 	m_chgSubParentp = NULL;
 	m_chgSubStmts = 0;
+        m_code = 0;
+        m_finding = false;
 	m_funcNum = 0;
 	nodep->accept(*this);
     }
diff --git a/src/V3Unroll.cpp b/src/V3Unroll.cpp
index 55ab2227f..bd7448a59 100644
--- a/src/V3Unroll.cpp
+++ b/src/V3Unroll.cpp
@@ -461,9 +461,11 @@ public:
     UnrollVisitor(AstNode* nodep, bool generate, const string& beginName) {
 	m_forVarp = NULL;
 	m_forVscp = NULL;
+        m_varValuep = NULL;
 	m_ignoreIncp = NULL;
 	m_varModeCheck = false;
 	m_varModeReplace = false;
+        m_varAssignHit = false;
 	m_generate = generate;
 	m_beginName = beginName;
 	//