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diff --git a/absl/log/initialize.h b/absl/log/initialize.h
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+// Copyright 2022 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: log/initialize.h
+// -----------------------------------------------------------------------------
+//
+// This header declares the Abseil Log initialization routine InitializeLog().
+
+#ifndef ABSL_LOG_INITIALIZE_H_
+#define ABSL_LOG_INITIALIZE_H_
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// InitializeLog()
+//
+// Initializes the Abseil logging library.
+//
+// Before this function is called, all log messages are directed only to stderr.
+// After initialization is finished, log messages are directed to all registered
+// `LogSink`s.
+//
+// It is an error to call this function twice.
+//
+// There is no corresponding function to shut down the logging library.
+void InitializeLog();
+
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_LOG_INITIALIZE_H_