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#if defined(__GNUC__)
#define UNUSED __attribute__((unused))
#define SIZE(x) static (x)
#define NON_NULL SIZE(1)
#elif defined(__clang__)
#define UNUSED __attribute__((unused))
#define SIZE(x) static (x)
#define NON_NULL SIZE(1)
#else
/*
For example MSVC, which is not fully C11 compliant (e.g. it does not support
a[static N] notation for array parameters).
*/
#define UNUSED
#define SIZE(x)
#define NON_NULL
#endif
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