55daf1aef6
This CL introduces the utility macro RTC_EXPORT which will let WebRTC developers decide which symbols are supposed to be exported/imported and which ones are private. RTC_EXPORT will only export/import symbols in a component build, more info: https://cs.chromium.org/chromium/src/docs/component_build.md. During a component build, the macro COMPONENT_BUILD will be globally defined in a consistent fashion so it is safe to rely on it to understand how to expand RTC_EXPORT. In a non component build, RTC_EXPORT will expand to nothing. Bug: webrtc:9419 Change-Id: Ic58162783be7f5883136ade27f324d6d34fdf932 Reviewed-on: https://webrtc-review.googlesource.com/97960 Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Reviewed-by: Patrik Höglund <phoglund@webrtc.org> Reviewed-by: Yves Gerey <yvesg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#24757}
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_BUILD_RTC_EXPORT_H_
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#define RTC_BASE_BUILD_RTC_EXPORT_H_
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// RTC_EXPORT is used to mark symbols as exported or imported when WebRTC is
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// built or used as a shared library.
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// When WebRTC is built as a static library the RTC_EXPORT macro expands to
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// nothing.
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#ifdef COMPONENT_BUILD
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#ifdef WEBRTC_WIN
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#ifdef WEBRTC_LIBRARY_IMPL
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#define RTC_EXPORT __declspec(dllexport)
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#else
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#define RTC_EXPORT __declspec(dllimport)
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#endif
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#else // WEBRTC_WIN
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#if __has_attribute(visibility) && defined(WEBRTC_LIBRARY_IMPL)
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#define RTC_EXPORT __attribute__((visibility("default")))
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#endif
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#endif // WEBRTC_WIN
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#endif // COMPONENT_BUILD
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#ifndef RTC_EXPORT
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#define RTC_EXPORT
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#endif
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#endif // RTC_BASE_BUILD_RTC_EXPORT_H_
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