1 files changed, 10 insertions, 0 deletions
diff --git a/lib/Sema/AnalysisBasedWarnings.cpp b/lib/Sema/AnalysisBasedWarnings.cpp
index 5953d020b4fb..a987a8ce0b31 100644
--- a/lib/Sema/AnalysisBasedWarnings.cpp
+++ b/lib/Sema/AnalysisBasedWarnings.cpp
@@ -56,6 +56,8 @@ using namespace clang;
 namespace {
   class UnreachableCodeHandler : public reachable_code::Callback {
     Sema &S;
+    SourceRange PreviousSilenceableCondVal;
+
   public:
     UnreachableCodeHandler(Sema &s) : S(s) {}
 
@@ -64,6 +66,14 @@ namespace {
                            SourceRange SilenceableCondVal,
                            SourceRange R1,
                            SourceRange R2) override {
+      // Avoid reporting multiple unreachable code diagnostics that are
+      // triggered by the same conditional value.
+      if (PreviousSilenceableCondVal.isValid() &&
+          SilenceableCondVal.isValid() &&
+          PreviousSilenceableCondVal == SilenceableCondVal)
+        return;
+      PreviousSilenceableCondVal = SilenceableCondVal;
+
       unsigned diag = diag::warn_unreachable;
       switch (UK) {
         case reachable_code::UK_Break: