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diff --git a/src/third_party/unwind/dist/include/compiler.h b/src/third_party/unwind/dist/include/compiler.h
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+/* libunwind - a platform-independent unwind library
+   Copyright (C) 2001-2005 Hewlett-Packard Co
+   Copyright (C) 2007 David Mosberger-Tang
+        Contributed by David Mosberger-Tang <dmosberger@gmail.com>
+
+This file is part of libunwind.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
+
+/* Compiler specific useful bits that are used in libunwind, and also in the
+ * tests. */
+
+#ifndef COMPILER_H
+#define COMPILER_H
+
+#ifdef __GNUC__
+# define ALIGNED(x)     __attribute__((aligned(x)))
+# define CONST_ATTR     __attribute__((__const__))
+# define UNUSED         __attribute__((unused))
+# define NOINLINE       __attribute__((noinline))
+# define NORETURN       __attribute__((noreturn))
+# define ALIAS2(name)   #name
+# define ALIAS(name)    __attribute__((alias (ALIAS2(name))))
+# if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
+#  define ALWAYS_INLINE inline __attribute__((always_inline))
+#  define HIDDEN        __attribute__((visibility ("hidden")))
+# else
+#  define ALWAYS_INLINE
+#  define HIDDEN
+# endif
+# define WEAK           __attribute__((weak))
+# if (__GNUC__ >= 3)
+#  define likely(x)     __builtin_expect ((x), 1)
+#  define unlikely(x)   __builtin_expect ((x), 0)
+# else
+#  define likely(x)     (x)
+#  define unlikely(x)   (x)
+# endif
+#else
+# define ALIGNED(x)
+# define ALWAYS_INLINE
+# define CONST_ATTR
+# define UNUSED
+# define NOINLINE
+# define NORETURN
+# define ALIAS(name)
+# define HIDDEN
+# define WEAK
+# define likely(x)      (x)
+# define unlikely(x)    (x)
+#endif
+
+#define ARRAY_SIZE(a)   (sizeof (a) / sizeof ((a)[0]))
+
+#endif /* COMPILER_H */