This patch adds a new third-party library that implements an ELF dynamic linker.

third_party/crazy_linker/crazy_linker/src/crazy_linker_debug.h

+// Copyright (c) 2013 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 CRAZY_LINKER_DEBUG_H
+#define CRAZY_LINKER_DEBUG_H
+
+// Set CRAZY_DEBUG on the command-line to 1 to enable debugging support.
+// This really means adding traces that will be sent to both stderr
+// and the logcat during execution.
+#ifndef CRAZY_DEBUG
+#define CRAZY_DEBUG 0
+#endif
+
+namespace crazy {
+
+#if CRAZY_DEBUG
+
+void Log(const char* fmt, ...);
+void LogErrno(const char* fmt, ...);
+
+#define LOG(...)        ::crazy::Log(__VA_ARGS__)
+#define LOG_ERRNO(...)  ::crazy::LogErrno(__VA_ARGS__)
+
+#else
+
+#define LOG(...)        ((void)0)
+#define LOG_ERRNO(...)  ((void)0)
+
+#endif
+
+// Conditional logging.
+#define LOG_IF(cond, ...)  \
+    do { if ((cond)) LOG(__VA_ARGS__); } while (0)
+
+#define LOG_ERRNO_IF(cond, ...) \
+    do { if ((cond)) LOG_ERRNO(__VA_ARGS__); } while (0)
+
+}  // namespace crazy
+
+#endif  // CRAZY_LINKER_DEBUG_H