diff --git a/lib/Analysis/IPA/Andersens.cpp b/lib/Analysis/IPA/Andersens.cpp
index cc7ad7e..474781f 100644
--- a/lib/Analysis/IPA/Andersens.cpp
+++ b/lib/Analysis/IPA/Andersens.cpp
@@ -246,7 +246,7 @@
       // Used for work list prioritization.
       unsigned Timestamp;
 
-      Node(bool direct = true) :
+      explicit Node(bool direct = true) :
         Val(0), Edges(0), PointsTo(0), OldPointsTo(0), 
         PointerEquivLabel(0), LocationEquivLabel(0), PredEdges(0),
         ImplicitPredEdges(0), PointedToBy(0), NumInEdges(0),
diff --git a/lib/CodeGen/CollectorMetadata.cpp b/lib/CodeGen/CollectorMetadata.cpp
index 5734939..43f3d43 100644
--- a/lib/CodeGen/CollectorMetadata.cpp
+++ b/lib/CodeGen/CollectorMetadata.cpp
@@ -30,7 +30,7 @@
     std::ostream &OS;
     
   public:
-    Printer(std::ostream &OS = *cerr);
+    explicit Printer(std::ostream &OS = *cerr);
     
     const char *getPassName() const;
     void getAnalysisUsage(AnalysisUsage &AU) const;
diff --git a/lib/CodeGen/ELFWriter.cpp b/lib/CodeGen/ELFWriter.cpp
index efdf029..d054adb 100644
--- a/lib/CodeGen/ELFWriter.cpp
+++ b/lib/CodeGen/ELFWriter.cpp
@@ -72,7 +72,7 @@
     std::vector<unsigned char> *OutBuffer;
     size_t FnStart;
   public:
-    ELFCodeEmitter(ELFWriter &ew) : EW(ew), TM(EW.TM), OutBuffer(0) {}
+    explicit ELFCodeEmitter(ELFWriter &ew) : EW(ew), TM(EW.TM), OutBuffer(0) {}
 
     void startFunction(MachineFunction &F);
     bool finishFunction(MachineFunction &F);
diff --git a/lib/CodeGen/SimpleRegisterCoalescing.h b/lib/CodeGen/SimpleRegisterCoalescing.h
index c3b2895..fcdab4a 100644
--- a/lib/CodeGen/SimpleRegisterCoalescing.h
+++ b/lib/CodeGen/SimpleRegisterCoalescing.h
@@ -48,7 +48,7 @@
   ///
   struct CopyRecSort : public std::binary_function<CopyRec,CopyRec,bool> {
     JoinPriorityQueue<CopyRecSort> *JPQ;
-    CopyRecSort(JoinPriorityQueue<CopyRecSort> *jpq) : JPQ(jpq) {}
+    explicit CopyRecSort(JoinPriorityQueue<CopyRecSort> *jpq) : JPQ(jpq) {}
     CopyRecSort(const CopyRecSort &RHS) : JPQ(RHS.JPQ) {}
     bool operator()(CopyRec left, CopyRec right) const;
   };
@@ -61,7 +61,8 @@
     std::priority_queue<CopyRec, std::vector<CopyRec>, SF> Queue;
 
   public:
-    JoinPriorityQueue(SimpleRegisterCoalescing *rc) : Rc(rc), Queue(SF(this)) {}
+    explicit JoinPriorityQueue(SimpleRegisterCoalescing *rc)
+      : Rc(rc), Queue(SF(this)) {}
 
     bool empty() const { return Queue.empty(); }
     void push(CopyRec R) { Queue.push(R); }
diff --git a/lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp b/lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp
index f45875f..4e9b77b 100644
--- a/lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp
+++ b/lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp
@@ -653,7 +653,7 @@
 // char *fgets(char *s, int n, FILE *stream);
 GenericValue lle_X_fgets(FunctionType *FT, const vector<GenericValue> &Args) {
   assert(Args.size() == 3);
-  return GVTOP(fgets((char*)GVTOP(Args[0]), Args[1].IntVal.getZExtValue(),
+  return PTOGV(fgets((char*)GVTOP(Args[0]), Args[1].IntVal.getZExtValue(),
                      getFILE(GVTOP(Args[2]))));
 }