Fix GCC 4.7.0 compile warnings, bug530.

Changes

@@ -41,6 +41,8 @@ indicates the contributor was also the author of the fix; Thanks!
 
 ****  Fix false UNUSED warning on file system calls.  [Holger Waechtler]
 
+****  Fix GCC 4.7.0 compile warnings, bug530.  [Jeremy Bennett]
+
 ****  Fix svdpi.h compile error on Apple OS.
 
 

src/V3Cdc.cpp

@@ -360,7 +360,7 @@ private:
     CdcEitherVertex* traceAsyncRecurse(CdcEitherVertex* vertexp, bool mark) {
 	// First pass: Return vertex of any hazardous stuff attached, or NULL if OK
 	// If first pass returns true, second pass calls asyncPath() on appropriate nodes
-	if (vertexp->user()>=m_userGeneration) return false;   // Processed - prevent loop
+	if (vertexp->user()>=m_userGeneration) return NULL;   // Processed - prevent loop
 	vertexp->user(m_userGeneration);
 
 	CdcEitherVertex* mark_outp = NULL;
@@ -383,7 +383,7 @@ private:
 		    CdcEitherVertex* eFromVertexp = (CdcEitherVertex*)edgep->fromp();
 		    eFromVertexp->asyncPath(true);
 		}
-		return false;
+		return NULL;
 	    }
 	    // Also ok if from flop, but partially trace the flop so more obvious to users
 	    if (vvertexp->fromFlop()) {
@@ -391,7 +391,7 @@ private:
 		    CdcEitherVertex* eFromVertexp = (CdcEitherVertex*)edgep->fromp();
 		    eFromVertexp->asyncPath(true);
 		}
-		return false;
+		return NULL;
 	    }
 	}
 

src/V3Clean.cpp

@@ -82,9 +82,9 @@ private:
 		nodep->dtypep(new_dtypep);
 	    } else {
 		nodep->dtypeChgWidth(width, nodep->widthMin());
-		AstNodeDType* new_dtypep = nodep->dtypep();
-		if (new_dtypep == old_dtypep) nodep->v3fatalSrc("Dtype didn't change when width changed");
-		old_dtypep->user3p(new_dtypep);  // Remember for next time
+		AstNodeDType* new_dtypep2 = nodep->dtypep();
+		if (new_dtypep2 == old_dtypep) nodep->v3fatalSrc("Dtype didn't change when width changed");
+		old_dtypep->user3p(new_dtypep2);  // Remember for next time
 	    }
 	}
     }

src/V3PreProc.cpp

@@ -320,7 +320,7 @@ string V3PreProcImp::defParams(const string& name) {
 }
 FileLine* V3PreProcImp::defFileline(const string& name) {
     DefinesMap::iterator iter = m_defines.find(name);
-    if (iter == m_defines.end()) return false;
+    if (iter == m_defines.end()) return NULL;
     return iter->second.fileline();
 }
 void V3PreProcImp::define(FileLine* fl, const string& name, const string& value,

src/V3Tristate.cpp

@@ -1239,7 +1239,7 @@ class TristateVisitor : public TristateBaseVisitor {
 	// Clear state
 	m_tgraph.clear();
 	m_unique = 0;
-	m_logicp = false;
+	m_logicp = NULL;
 	m_lhsmap.clear();
 	m_modp = nodep;
 	// Walk the graph, finding all variables and tristate constructs
@@ -1291,7 +1291,7 @@ public:
 	m_cellp = NULL;
 	m_unique = 0;
 	m_alhs = false;
-	m_logicp = false;
+	m_logicp = NULL;
 	m_tgraph.clear();
 	nodep->accept(*this);
     }