1 files changed, 6 insertions, 4 deletions
diff --git a/clang/lib/Driver/SanitizerArgs.cpp b/clang/lib/Driver/SanitizerArgs.cpp
index 4d27a393182..35041b56971 100644
--- a/clang/lib/Driver/SanitizerArgs.cpp
+++ b/clang/lib/Driver/SanitizerArgs.cpp
@@ -188,10 +188,6 @@ bool SanitizerArgs::needsUnwindTables() const {
   return Sanitizers.Mask & NeedsUnwindTables;
 }
 
-bool SanitizerArgs::needsLTO() const {
-  return Sanitizers.Mask & NeedsLTO;
-}
-
 void SanitizerArgs::clear() {
   Sanitizers.clear();
   RecoverableSanitizers.clear();
@@ -301,6 +297,12 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
     Kinds &= ~Vptr;
   }
 
+  // Check that LTO is enabled if we need it.
+  if ((Kinds & NeedsLTO) && !D.IsUsingLTO(Args)) {
+    D.Diag(diag::err_drv_argument_only_allowed_with)
+        << lastArgumentForMask(D, Args, Kinds & NeedsLTO) << "-flto";
+  }
+
   // Warn about incompatible groups of sanitizers.
   std::pair<SanitizerMask, SanitizerMask> IncompatibleGroups[] = {
       std::make_pair(Address, Thread), std::make_pair(Address, Memory),