#define DUK_NORETURN(decl)  decl __attribute__((noreturn))

#if defined(__clang__) && defined(__has_builtin)
#if __has_builtin(__builtin_unreachable)
#define DUK_UNREACHABLE()  do { __builtin_unreachable(); } while (0)
#endif
#endif

#define DUK_USE_BRANCH_HINTS
#define DUK_LIKELY(x)    __builtin_expect((x), 1)
#define DUK_UNLIKELY(x)  __builtin_expect((x), 0)
#if defined(__clang__) && defined(__has_builtin)
#if __has_builtin(__builtin_unpredictable)
#define DUK_UNPREDICTABLE(x)  __builtin_unpredictable((x))
#endif
#endif

#if defined(DUK_F_C99) || defined(DUK_F_CPP11)
#define DUK_NOINLINE        __attribute__((noinline))
#define DUK_INLINE          inline
#define DUK_ALWAYS_INLINE   inline __attribute__((always_inline))
#endif

#snippet "gcc_clang_visibility.h.in"

#define DUK_USE_COMPILER_STRING "emscripten"

#undef DUK_USE_VARIADIC_MACROS
#if defined(DUK_F_C99) || defined(DUK_F_CPP11)
#define DUK_USE_VARIADIC_MACROS
#endif

#define DUK_USE_UNION_INITIALIZERS

#undef DUK_USE_FLEX_C99
#undef DUK_USE_FLEX_ZEROSIZE
#undef DUK_USE_FLEX_ONESIZE
#if defined(DUK_F_C99)
#define DUK_USE_FLEX_C99
#else
#define DUK_USE_FLEX_ZEROSIZE
#endif

#undef DUK_USE_GCC_PRAGMAS
#define DUK_USE_PACK_CLANG_ATTR