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diff --git a/testing/tools/coverage/llvm-gcov b/testing/tools/coverage/llvm-gcov
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+#!/bin/bash
+# Copyright 2017 The PDFium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Wrapper script to make llvm-cov behave like gcov, so it can be passed in as the --gcov-tool
+# parameter when using lcov. Specifically adds the keyword 'gcov' to the arguments being passed in,
+# to tell llvm-cov to operate in gcov compatibility mode.
+#
+# LLVM_COV_BIN needs to be set by caller and should the path to
+# a llvm-cov binary with a version of 3.5 or greater.
+
+set -e
+
+exec ${LLVM_COV_BIN} gcov $*