1 files changed, 2 insertions, 0 deletions
diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index f3d033c3e79..12b78ea3cd9 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -1891,6 +1891,8 @@ bool ASTUnit::LoadFromCompilerInvocation(
     PreambleRebuildCounter = PrecompilePreambleAfterNParses;
     OverrideMainBuffer =
         getMainBufferWithPrecompiledPreamble(PCHContainerOps, *Invocation);
+    getDiagnostics().Reset();
+    ProcessWarningOptions(getDiagnostics(), Invocation->getDiagnosticOpts());
   }
   
   SimpleTimer ParsingTimer(WantTiming);