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-rw-r--r--base/base_export.h26
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diff --git a/base/base_export.h b/base/base_export.h
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+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_BASE_OSP_EXPORT_
+#define BASE_BASE_OSP_EXPORT_
+#pragma once
+
+#if defined(COMPONENT_BUILD)
+#if defined(WIN32)
+
+#if defined(BASE_IMPLEMENTATION)
+#define BASE_EXPORT __declspec(dllexport)
+#else
+#define BASE_EXPORT __declspec(dllimport)
+#endif // defined(BASE_IMPLEMENTATION)
+
+#else // defined(WIN32)
+#define BASE_EXPORT __attribute__((visibility("default")))
+#endif
+
+#else // defined(COMPONENT_BUILD)
+#define BASE_EXPORT
+#endif
+
+#endif // BASE_BASE_OSP_EXPORT_