diff --git a/compiler/codegen/OMRCodeGenerator.cpp b/compiler/codegen/OMRCodeGenerator.cpp
index e4fc9bf385a..0304aee166c 100644
--- a/compiler/codegen/OMRCodeGenerator.cpp
+++ b/compiler/codegen/OMRCodeGenerator.cpp
@@ -1242,13 +1242,13 @@ bool OMR::CodeGenerator::traceBCDCodeGen()
    return self()->comp()->getOption(TR_TraceCG);
    }
 
-void OMR::CodeGenerator::traceBCDEntry(char *str, TR::Node *node)
+void OMR::CodeGenerator::traceBCDEntry(const char *str, TR::Node *node)
    {
    if (self()->traceBCDCodeGen())
       traceMsg(self()->comp(),"EVAL: %s 0x%p - start\n",str,node);
    }
 
-void OMR::CodeGenerator::traceBCDExit(char *str, TR::Node *node)
+void OMR::CodeGenerator::traceBCDExit(const char *str, TR::Node *node)
    {
    if (self()->traceBCDCodeGen())
       traceMsg(self()->comp(),"EVAL: %s 0x%p - end\n",str,node);
diff --git a/compiler/codegen/OMRCodeGenerator.hpp b/compiler/codegen/OMRCodeGenerator.hpp
index bbf9a27ff34..5c3fb60f6c5 100644
--- a/compiler/codegen/OMRCodeGenerator.hpp
+++ b/compiler/codegen/OMRCodeGenerator.hpp
@@ -1407,8 +1407,8 @@ class OMR_EXTENSIBLE CodeGenerator
    //Rather confusingly not used -only- in BCD related codegen.
    //... has leaked into non-BCD code.
    bool traceBCDCodeGen();
-   void traceBCDEntry(char *str, TR::Node *node);
-   void traceBCDExit(char *str, TR::Node *node);
+   void traceBCDEntry(const char *str, TR::Node *node);
+   void traceBCDExit(const char *str, TR::Node *node);
 
    TR_BitVector *getLiveButMaybeUnreferencedLocals() {return _liveButMaybeUnreferencedLocals;}
    TR_BitVector *setLiveButMaybeUnreferencedLocals(TR_BitVector *v) {return (_liveButMaybeUnreferencedLocals = v);}
diff --git a/compiler/compile/CompilationTypes.hpp b/compiler/compile/CompilationTypes.hpp
index 43fe4a47262..d6a00722746 100644
--- a/compiler/compile/CompilationTypes.hpp
+++ b/compiler/compile/CompilationTypes.hpp
@@ -105,7 +105,7 @@ typedef CS2::LexicalBlockTimer<TR::Allocator>  LexicalTimer;
 // for TR_Debug usage
 typedef CS2::HashTable<void*, intptr_t, TR::Allocator> ToNumberMap;
 typedef CS2::HashTable<void*, char*, TR::Allocator>    ToStringMap;
-typedef CS2::HashTable<void*, List<char>*, TR::Allocator> ToCommentMap;
+typedef CS2::HashTable<void*, List<const char>*, TR::Allocator> ToCommentMap;
 
 
 
diff --git a/compiler/ras/Debug.cpp b/compiler/ras/Debug.cpp
index 935642f74c7..7d536b4cafb 100644
--- a/compiler/ras/Debug.cpp
+++ b/compiler/ras/Debug.cpp
@@ -379,7 +379,7 @@ TR_Debug::newVariableSizeSymbol(TR::AutomaticSymbol *sym)
    }
 
 void
-TR_Debug::addInstructionComment(TR::Instruction *instr, char * comment, ...)
+TR_Debug::addInstructionComment(TR::Instruction *instr, const char * comment, ...)
    {
    TR_ASSERT(_comp, "Required compilation object is NULL.\n");
 
@@ -389,12 +389,12 @@ TR_Debug::addInstructionComment(TR::Instruction *instr, char * comment, ...)
    CS2::HashIndex hashIndex;
    if (_comp->getToCommentMap().Locate(instr, hashIndex))
       {
-      List<char> *comments = _comp->getToCommentMap().DataAt(hashIndex);
+      List<const char> *comments = _comp->getToCommentMap().DataAt(hashIndex);
       comments->add(comment);
       }
    else
       {
-      List<char> *comments = new (_comp->trHeapMemory()) List<char>(_comp->trMemory());
+      List<const char> *comments = new (_comp->trHeapMemory()) List<const char>(_comp->trMemory());
       comments->add(comment);
       _comp->getToCommentMap().Add(instr, comments);
       }
diff --git a/compiler/ras/Debug.hpp b/compiler/ras/Debug.hpp
index bf474d2f45a..3eea2a5fb29 100644
--- a/compiler/ras/Debug.hpp
+++ b/compiler/ras/Debug.hpp
@@ -422,7 +422,7 @@ class TR_Debug
    virtual void newRegister(TR::Register *);
    virtual void newVariableSizeSymbol(TR::AutomaticSymbol *sym);
    virtual void newInstruction(TR::Instruction *);
-   virtual void addInstructionComment(TR::Instruction *, char*, ...);
+   virtual void addInstructionComment(TR::Instruction *, const char*, ...);
 
    /**
     * @brief Check whether to trigger debugger breakpoint or launch debugger
diff --git a/compiler/z/codegen/BinaryCommutativeAnalyser.cpp b/compiler/z/codegen/BinaryCommutativeAnalyser.cpp
index 9114474fee1..7b1e819aca2 100644
--- a/compiler/z/codegen/BinaryCommutativeAnalyser.cpp
+++ b/compiler/z/codegen/BinaryCommutativeAnalyser.cpp
@@ -153,7 +153,7 @@ TR_S390BinaryCommutativeAnalyser::genericAnalyser(TR::Node * root, TR::InstOpCod
    TR::Register * nodeReg = NULL;
    TR::Instruction * finalInstr = NULL;
    TR::Compilation *comp = cg()->comp();
-   char * CLOBBER_EVAL  = "LR=Clobber_eval";
+   const char * CLOBBER_EVAL  = "LR=Clobber_eval";
    TR_Debug * debugObj = cg()->getDebug();
    if (cg()->whichChildToEvaluate(root) == 0)
       {
@@ -701,7 +701,7 @@ TR_S390BinaryCommutativeAnalyser::integerAddAnalyser(TR::Node * root, TR::InstOp
    // which do not produce a carry. The flag would be used to prevent such optimizations when the carry is needed.
    /* bool setsOrReadsCC = NEED_CC(node) || (node->getOpCodeValue() == TR::luaddc) || (node->getOpCodeValue() == TR::iuaddc); */
 
-   char * CLOBBER_EVAL = "LR=Clobber_eval";
+   const char * CLOBBER_EVAL = "LR=Clobber_eval";
    TR_Debug * debugObj = cg()->getDebug();
    if (cg()->whichChildToEvaluate(root) == 0)
       {
diff --git a/compiler/z/codegen/BinaryEvaluator.cpp b/compiler/z/codegen/BinaryEvaluator.cpp
index 33aec66ebf4..66ecd2e7a41 100644
--- a/compiler/z/codegen/BinaryEvaluator.cpp
+++ b/compiler/z/codegen/BinaryEvaluator.cpp
@@ -1021,7 +1021,7 @@ iDivRemGenericEvaluator(TR::Node * node, TR::CodeGenerator * cg, bool isDivision
    TR::Node * secondChild = node->getSecondChild();
    TR::Instruction * cursor = NULL;
 
-   char * REG_USER_DEF  = "LR=Reg_user_def";
+   const char * REG_USER_DEF  = "LR=Reg_user_def";
    TR_Debug * debugObj = cg->getDebug();
 
    // A/A, return 1 (div) or 0 (rem).
diff --git a/compiler/z/codegen/OMRMachine.cpp b/compiler/z/codegen/OMRMachine.cpp
index 5f3d07253a2..758b6254ed9 100644
--- a/compiler/z/codegen/OMRMachine.cpp
+++ b/compiler/z/codegen/OMRMachine.cpp
@@ -186,8 +186,8 @@ OMR::Z::Machine::registerExchange(TR::CodeGenerator* cg,
    TR::Compilation *comp = cg->comp();
    TR::Node * currentNode = precedingInstruction->getNode();
    TR::Instruction * currentInstruction = NULL;
-   char * REG_EXCHANGE = "LR=Reg_exchg";
-   char * REG_PAIR     = "LR=Reg_pair";
+   const char * REG_EXCHANGE = "LR=Reg_exchg";
+   const char * REG_PAIR     = "LR=Reg_pair";
    TR_Debug * debugObj = cg->getDebug();
    TR::Machine *machine = cg->machine();