1 files changed, 10 insertions, 5 deletions
diff --git a/lib/Transforms/Utils/AddDiscriminators.cpp b/lib/Transforms/Utils/AddDiscriminators.cpp
index f42635e..196ac79 100644
--- a/lib/Transforms/Utils/AddDiscriminators.cpp
+++ b/lib/Transforms/Utils/AddDiscriminators.cpp
@@ -52,8 +52,6 @@
 // http://wiki.dwarfstd.org/index.php?title=Path_Discriminators
 //===----------------------------------------------------------------------===//
 
-#define DEBUG_TYPE "add-discriminators"
-
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/IR/BasicBlock.h"
 #include "llvm/IR/Constants.h"
@@ -69,6 +67,8 @@
 
 using namespace llvm;
 
+#define DEBUG_TYPE "add-discriminators"
+
 namespace {
   struct AddDiscriminators : public FunctionPass {
     static char ID; // Pass identification, replacement for typeid
@@ -99,7 +99,7 @@ FunctionPass *llvm::createAddDiscriminatorsPass() {
 
 static bool hasDebugInfo(const Function &F) {
   NamedMDNode *CUNodes = F.getParent()->getNamedMetadata("llvm.dbg.cu");
-  return CUNodes != 0;
+  return CUNodes != nullptr;
 }
 
 /// \brief Assign DWARF discriminators.
@@ -154,10 +154,15 @@ static bool hasDebugInfo(const Function &F) {
 /// file and line location as I2. This new lexical block will have a
 /// different discriminator number than I1.
 bool AddDiscriminators::runOnFunction(Function &F) {
-  // No need to do anything if there is no debug info for this function.
   // If the function has debug information, but the user has disabled
   // discriminators, do nothing.
-  if (!hasDebugInfo(F) || NoDiscriminators) return false;
+  // Simlarly, if the function has no debug info, do nothing.
+  // Finally, if this module is built with dwarf versions earlier than 4,
+  // do nothing (discriminator support is a DWARF 4 feature).
+  if (NoDiscriminators ||
+      !hasDebugInfo(F) ||
+      F.getParent()->getDwarfVersion() < 4)
+    return false;
 
   bool Changed = false;
   Module *M = F.getParent();