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diff --git a/lib/sanitizer_common/sanitizer_coverage_win_dll_thunk.cpp b/lib/sanitizer_common/sanitizer_coverage_win_dll_thunk.cpp
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+++ b/lib/sanitizer_common/sanitizer_coverage_win_dll_thunk.cpp
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+//===-- sanitizer_coverage_win_dll_thunk.cpp ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines a family of thunks that should be statically linked into
+// the DLLs that have instrumentation in order to delegate the calls to the
+// shared runtime that lives in the main binary.
+// See https://github.com/google/sanitizers/issues/209 for the details.
+//===----------------------------------------------------------------------===//
+#ifdef SANITIZER_DLL_THUNK
+#include "sanitizer_win_dll_thunk.h"
+// Sanitizer Coverage interface functions.
+#define INTERFACE_FUNCTION(Name) INTERCEPT_SANITIZER_FUNCTION(Name)
+#define INTERFACE_WEAK_FUNCTION(Name) INTERCEPT_SANITIZER_WEAK_FUNCTION(Name)
+#include "sanitizer_coverage_interface.inc"
+#endif // SANITIZER_DLL_THUNK