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diff --git a/third_party/libwebrtc/rtc_base/compile_assert_c.h b/third_party/libwebrtc/rtc_base/compile_assert_c.h
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+/*
+ * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef RTC_BASE_COMPILE_ASSERT_C_H_
+#define RTC_BASE_COMPILE_ASSERT_C_H_
+
+// Use this macro to verify at compile time that certain restrictions are met.
+// The argument is the boolean expression to evaluate.
+// Example:
+// RTC_COMPILE_ASSERT(sizeof(foo) < 128);
+// Note: In C++, use static_assert instead!
+#define RTC_COMPILE_ASSERT(expression) \
+ switch (0) { \
+ case 0: \
+ case expression:; \
+ }
+
+#endif // RTC_BASE_COMPILE_ASSERT_C_H_