// LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands
// to an expression which states that it is undefined behavior for the
-// compiler to reach this point.
+// compiler to reach this point. Otherwise is not defined.
#if defined(__clang__) || (__GNUC__ > 4) \
|| (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
# define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
-#else
-#ifdef __cplusplus
-extern "C" LLVM_ATTRIBUTE_NORETURN void abort() throw();
-#else
-extern LLVM_ATTRIBUTE_NORETURN void abort();
-#endif
-# define LLVM_BUILTIN_UNREACHABLE abort()
#endif
#endif