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In order to implement a WebRTC component in Chromium, WebRTC needs to export some symbols. If RTC_EXPORT relies on COMPONENT_BUILD to mark symbols as exported or imported, it will not be possible to incrementally add RTC_EXPORT because the Chromium build will break (two Chromium components that export a symbol or no component that exports it). By using `rtc_enable_symbol_export` (which makes GN define WEBRTC_ENABLE_SYMBOL_EXPORT), WebRTC will be able to incrementally mark symbols with RTC_EXPORT and flip the value of `rtc_enable_symbol_export` in the Chromium build when everything will be ready. Bug: webrtc:9419 Change-Id: I57ab63c53545c500eaaefd75c112b4674aa7cf19 Reviewed-on: https://webrtc-review.googlesource.com/c/104980 Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#25087}
43 lines
1.1 KiB
C
43 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_SYSTEM_RTC_EXPORT_H_
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#define RTC_BASE_SYSTEM_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 WEBRTC_ENABLE_SYMBOL_EXPORT
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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 // WEBRTC_ENABLE_SYMBOL_EXPORT
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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_SYSTEM_RTC_EXPORT_H_
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