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003174d8c9
1. gcc 4.4 does not support __builtin_unreachable, which makes the __GNUC__ branch definition to fail. 2. clang 3.5 doesn't support __builtin_assume and uses the last fallback option. There, BOOST_ASIO_ASSUME is defined without arguments, meaning it expands to incorrect code like `(void)0(base != 0)`. This also affects any other compilers that are not handled by prior branches.