diff --git a/include/llvm/Support/GCOV.h b/include/llvm/Support/GCOV.h
index 45d5fa04257..e552315f455 100644
--- a/include/llvm/Support/GCOV.h
+++ b/include/llvm/Support/GCOV.h
@@ -130,7 +130,7 @@ public:
     StringRef Str = Buffer->getBuffer().slice(Cursor, Cursor+4);
     assert (Str.empty() == false && "Unexpected memory buffer end!");
     Cursor += 4;
-    Result = *(uint32_t *)(Str.data());
+    Result = *(const uint32_t *)(Str.data());
     return Result;
   }
 
diff --git a/lib/Analysis/AliasSetTracker.cpp b/lib/Analysis/AliasSetTracker.cpp
index 92e89068e44..e29c2bc22b3 100644
--- a/lib/Analysis/AliasSetTracker.cpp
+++ b/lib/Analysis/AliasSetTracker.cpp
@@ -550,7 +550,7 @@ void AliasSetTracker::copyValue(Value *From, Value *To) {
 //===----------------------------------------------------------------------===//
 
 void AliasSet::print(raw_ostream &OS) const {
-  OS << "  AliasSet[" << (void*)this << ", " << RefCount << "] ";
+  OS << "  AliasSet[" << (const void*)this << ", " << RefCount << "] ";
   OS << (AliasTy == MustAlias ? "must" : "may") << " alias, ";
   switch (AccessTy) {
   case NoModRef: OS << "No access "; break;
diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp
index 29736466589..8d6452f7141 100644
--- a/lib/CodeGen/MachineFunction.cpp
+++ b/lib/CodeGen/MachineFunction.cpp
@@ -754,7 +754,7 @@ void MachineConstantPool::print(raw_ostream &OS) const {
     if (Constants[i].isMachineConstantPoolEntry())
       Constants[i].Val.MachineCPVal->print(OS);
     else
-      OS << *(Value*)Constants[i].Val.ConstVal;
+      OS << *(const Value*)Constants[i].Val.ConstVal;
     OS << ", align=" << Constants[i].getAlignment();
     OS << "\n";
   }
diff --git a/lib/CodeGen/MachineVerifier.cpp b/lib/CodeGen/MachineVerifier.cpp
index f83cdfba5aa..181e09ecc9e 100644
--- a/lib/CodeGen/MachineVerifier.cpp
+++ b/lib/CodeGen/MachineVerifier.cpp
@@ -368,7 +368,7 @@ void MachineVerifier::report(const char *msg, const MachineBasicBlock *MBB) {
   report(msg, MBB->getParent());
   *OS << "- basic block: BB#" << MBB->getNumber()
       << ' ' << MBB->getName()
-      << " (" << (void*)MBB << ')';
+      << " (" << (const void*)MBB << ')';
   if (Indexes)
     *OS << " [" << Indexes->getMBBStartIdx(MBB)
         << ';' <<  Indexes->getMBBEndIdx(MBB) << ')';
diff --git a/lib/CodeGen/Passes.cpp b/lib/CodeGen/Passes.cpp
index 56526f2732d..9564b5dbe1e 100644
--- a/lib/CodeGen/Passes.cpp
+++ b/lib/CodeGen/Passes.cpp
@@ -447,8 +447,8 @@ void TargetPassConfig::addMachinePasses() {
     const PassInfo *TPI = PR->getPassInfo(PrintMachineInstrs.getValue());
     const PassInfo *IPI = PR->getPassInfo(StringRef("print-machineinstrs"));
     assert (TPI && IPI && "Pass ID not registered!");
-    const char *TID = (char *)(TPI->getTypeInfo());
-    const char *IID = (char *)(IPI->getTypeInfo());
+    const char *TID = (const char *)(TPI->getTypeInfo());
+    const char *IID = (const char *)(IPI->getTypeInfo());
     insertPass(TID, IID);
   }
 
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
index 13cd011c2b8..2f41e648424 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
@@ -331,7 +331,7 @@ void SDNode::dump(const SelectionDAG *G) const {
 }
 
 void SDNode::print_types(raw_ostream &OS, const SelectionDAG *G) const {
-  OS << (void*)this << ": ";
+  OS << (const void*)this << ": ";
 
   for (unsigned i = 0, e = getNumValues(); i != e; ++i) {
     if (i) OS << ",";
@@ -559,7 +559,7 @@ static void DumpNodesr(raw_ostream &OS, const SDNode *N, unsigned indent,
       child->printr(OS, G);
       once.insert(child);
     } else {         // Just the address. FIXME: also print the child's opcode.
-      OS << (void*)child;
+      OS << (const void*)child;
       if (unsigned RN = N->getOperand(i).getResNo())
         OS << ":" << RN;
     }
diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index 10a534f0ff3..cbc7352f6f4 100644
--- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -772,7 +772,7 @@ void TargetLowering::computeRegisterProperties() {
       LegalIntReg = IntReg;
     } else {
       RegisterTypeForVT[IntReg] = TransformToType[IntReg] =
-        (MVT::SimpleValueType)LegalIntReg;
+        (const MVT::SimpleValueType)LegalIntReg;
       ValueTypeActions.setTypeAction(IVT, TypePromoteInteger);
     }
   }
diff --git a/lib/DebugInfo/DWARFFormValue.cpp b/lib/DebugInfo/DWARFFormValue.cpp
index fc23b38f2ef..c9ecbbbbd4b 100644
--- a/lib/DebugInfo/DWARFFormValue.cpp
+++ b/lib/DebugInfo/DWARFFormValue.cpp
@@ -150,7 +150,7 @@ DWARFFormValue::extractValue(DataExtractor data, uint32_t *offset_ptr,
       // Set the string value to also be the data for inlined cstr form
       // values only so we can tell the differnence between DW_FORM_string
       // and DW_FORM_strp form values
-      Value.data = (uint8_t*)Value.cstr;
+      Value.data = (const uint8_t*)Value.cstr;
       break;
     case DW_FORM_indirect:
       Form = data.getULEB128(offset_ptr);
diff --git a/lib/DebugInfo/DWARFFormValue.h b/lib/DebugInfo/DWARFFormValue.h
index 22ac0116646..c5b590db95f 100644
--- a/lib/DebugInfo/DWARFFormValue.h
+++ b/lib/DebugInfo/DWARFFormValue.h
@@ -52,7 +52,7 @@ public:
   bool extractValue(DataExtractor data, uint32_t *offset_ptr,
                     const DWARFCompileUnit *cu);
   bool isInlinedCStr() const {
-    return Value.data != NULL && Value.data == (uint8_t*)Value.cstr;
+    return Value.data != NULL && Value.data == (const uint8_t*)Value.cstr;
   }
   const uint8_t *BlockData() const;
   uint64_t getReference(const DWARFCompileUnit* cu) const;
diff --git a/lib/ExecutionEngine/ExecutionEngine.cpp b/lib/ExecutionEngine/ExecutionEngine.cpp
index 4afc900f640..ba0aeca58da 100644
--- a/lib/ExecutionEngine/ExecutionEngine.cpp
+++ b/lib/ExecutionEngine/ExecutionEngine.cpp
@@ -833,7 +833,7 @@ GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
 static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
                              unsigned StoreBytes) {
   assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
-  uint8_t *Src = (uint8_t *)IntVal.getRawData();
+  const uint8_t *Src = (const uint8_t *)IntVal.getRawData();
 
   if (sys::isLittleEndianHost()) {
     // Little-endian host - the source is ordered from LSB to MSB.  Order the
diff --git a/lib/Target/ARM/ARMJITInfo.cpp b/lib/Target/ARM/ARMJITInfo.cpp
index 3f99cce1466..254d8f6b7c7 100644
--- a/lib/Target/ARM/ARMJITInfo.cpp
+++ b/lib/Target/ARM/ARMJITInfo.cpp
@@ -168,7 +168,7 @@ void *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn,
       intptr_t LazyPtr = getIndirectSymAddr(Fn);
       if (!LazyPtr) {
         // In PIC mode, the function stub is loading a lazy-ptr.
-        LazyPtr= (intptr_t)emitGlobalValueIndirectSym((GlobalValue*)F, Fn, JCE);
+        LazyPtr= (intptr_t)emitGlobalValueIndirectSym((const GlobalValue*)F, Fn, JCE);
         DEBUG(if (F)
                 errs() << "JIT: Indirect symbol emitted at [" << LazyPtr
                        << "] for GV '" << F->getName() << "'\n";
diff --git a/lib/Target/Mips/MipsISelLowering.cpp b/lib/Target/Mips/MipsISelLowering.cpp
index 91f91b115c9..aa7b459ff08 100644
--- a/lib/Target/Mips/MipsISelLowering.cpp
+++ b/lib/Target/Mips/MipsISelLowering.cpp
@@ -1571,7 +1571,7 @@ SDValue MipsTargetLowering::LowerGlobalAddress(SDValue Op,
   if (getTargetMachine().getRelocationModel() != Reloc::PIC_ && !IsN64) {
     SDVTList VTs = DAG.getVTList(MVT::i32);
 
-    MipsTargetObjectFile &TLOF = (MipsTargetObjectFile&)getObjFileLowering();
+    const MipsTargetObjectFile &TLOF = (const MipsTargetObjectFile&)getObjFileLowering();
 
     // %gp_rel relocation
     if (TLOF.IsGlobalInSmallSection(GV, getTargetMachine())) {
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 67ad99d3ce7..89f28e429b1 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -2836,7 +2836,7 @@ X86TargetLowering::IsEligibleForTailCallOptimization(SDValue Callee,
       MachineFrameInfo *MFI = MF.getFrameInfo();
       const MachineRegisterInfo *MRI = &MF.getRegInfo();
       const X86InstrInfo *TII =
-        ((X86TargetMachine&)getTargetMachine()).getInstrInfo();
+        ((const X86TargetMachine&)getTargetMachine()).getInstrInfo();
       for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
         CCValAssign &VA = ArgLocs[i];
         SDValue Arg = OutVals[i];
diff --git a/lib/Transforms/Utils/SimplifyCFG.cpp b/lib/Transforms/Utils/SimplifyCFG.cpp
index 04cc11dea04..6cd3bbc4d8b 100644
--- a/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -732,8 +732,8 @@ namespace {
 }
 
 static int ConstantIntSortPredicate(const void *P1, const void *P2) {
-  const ConstantInt *LHS = *(const ConstantInt**)P1;
-  const ConstantInt *RHS = *(const ConstantInt**)P2;
+  const ConstantInt *LHS = *(const ConstantInt*const*)P1;
+  const ConstantInt *RHS = *(const ConstantInt*const*)P2;
   if (LHS->getValue().ult(RHS->getValue()))
     return 1;
   if (LHS->getValue() == RHS->getValue())
diff --git a/lib/VMCore/PassManager.cpp b/lib/VMCore/PassManager.cpp
index 4530c0495f1..53f11499e4b 100644
--- a/lib/VMCore/PassManager.cpp
+++ b/lib/VMCore/PassManager.cpp
@@ -1189,7 +1189,7 @@ void PMDataManager::dumpAnalysisUsage(StringRef Msg, const Pass *P,
   assert(PassDebugging >= Details);
   if (Set.empty())
     return;
-  dbgs() << (void*)P << std::string(getDepth()*2+3, ' ') << Msg << " Analyses:";
+  dbgs() << (const void*)P << std::string(getDepth()*2+3, ' ') << Msg << " Analyses:";
   for (unsigned i = 0; i != Set.size(); ++i) {
     if (i) dbgs() << ',';
     const PassInfo *PInf = PassRegistry::getPassRegistry()->getPassInfo(Set[i]);
diff --git a/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp b/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
index 40d40ca1bf1..8109ca4d5be 100644
--- a/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
+++ b/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
@@ -483,7 +483,7 @@ static int AnalyzeBitcode() {
   if (MemBuf->getBufferSize() & 3)
     return Error("Bitcode stream should be a multiple of 4 bytes in length");
 
-  const unsigned char *BufPtr = (unsigned char *)MemBuf->getBufferStart();
+  const unsigned char *BufPtr = (const unsigned char *)MemBuf->getBufferStart();
   const unsigned char *EndBufPtr = BufPtr+MemBuf->getBufferSize();
 
   // If we have a wrapper header, parse it and ignore the non-bc file contents.
diff --git a/tools/lto/LTOModule.cpp b/tools/lto/LTOModule.cpp
index d588f6a61b0..b98bfab3333 100644
--- a/tools/lto/LTOModule.cpp
+++ b/tools/lto/LTOModule.cpp
@@ -163,7 +163,7 @@ LTOModule::LTOModule(llvm::Module *m, llvm::TargetMachine *t)
 /// isBitcodeFile - Returns 'true' if the file (or memory contents) is LLVM
 /// bitcode.
 bool LTOModule::isBitcodeFile(const void *mem, size_t length) {
-  return llvm::sys::IdentifyFileType((char*)mem, length)
+  return llvm::sys::IdentifyFileType((const char*)mem, length)
     == llvm::sys::Bitcode_FileType;
 }
 
@@ -307,7 +307,7 @@ LTOModule *LTOModule::makeLTOModule(MemoryBuffer *buffer,
 
 /// makeBuffer - Create a MemoryBuffer from a memory range.
 MemoryBuffer *LTOModule::makeBuffer(const void *mem, size_t length) {
-  const char *startPtr = (char*)mem;
+  const char *startPtr = (const char*)mem;
   return MemoryBuffer::getMemBuffer(StringRef(startPtr, length), "", false);
 }