2 files changed, 9 insertions, 4 deletions
diff --git a/llvm/tools/llvm-diff/DiffLog.cpp b/llvm/tools/llvm-diff/DiffLog.cpp
index 24a1b08d545..ed86058f1af 100644
--- a/llvm/tools/llvm-diff/DiffLog.cpp
+++ b/llvm/tools/llvm-diff/DiffLog.cpp
@@ -20,7 +20,8 @@
 using namespace llvm;
 
 LogBuilder::~LogBuilder() {
-  consumer.logf(*this);
+  if (consumer)
+    consumer->logf(*this);
 }
 
 StringRef LogBuilder::getFormat() const { return Format; }
diff --git a/llvm/tools/llvm-diff/DiffLog.h b/llvm/tools/llvm-diff/DiffLog.h
index 8eb53ffffcc..8f28461afdd 100644
--- a/llvm/tools/llvm-diff/DiffLog.h
+++ b/llvm/tools/llvm-diff/DiffLog.h
@@ -27,7 +27,7 @@ namespace llvm {
 
   /// A temporary-object class for building up log messages.
   class LogBuilder {
-    Consumer &consumer;
+    Consumer *consumer;
 
     /// The use of a stored StringRef here is okay because
     /// LogBuilder should be used only as a temporary, and as a
@@ -38,8 +38,12 @@ namespace llvm {
     SmallVector<Value*, 4> Arguments;
 
   public:
-    LogBuilder(Consumer &c, StringRef Format)
-      : consumer(c), Format(Format) {}
+    LogBuilder(Consumer &c, StringRef Format) : consumer(&c), Format(Format) {}
+    LogBuilder(LogBuilder &&L)
+        : consumer(L.consumer), Format(L.Format),
+          Arguments(std::move(L.Arguments)) {
+      L.consumer = nullptr;
+    }
 
     LogBuilder &operator<<(Value *V) {
       Arguments.push_back(V);