compat_c23.h

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#pragma once
#include <stdbool.h>
#include <stddef.h>
#ifndef nullptr
#define nullptr ((void *)0)
#endif
#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || (defined(_MSC_VER) && _MSC_VER >= 1900)
#include <assert.h>
#ifndef static_assert
#define static_assert(cond, msg) _Static_assert(cond, msg)
#endif
#endif
#if defined(__has_c_attribute)
#define COMPAT_HAS_C_ATTRIBUTE(x) __has_c_attribute(x)
#else
#define COMPAT_HAS_C_ATTRIBUTE(x) 0
#endif
#if COMPAT_HAS_C_ATTRIBUTE(nodiscard)
#define c23_nodiscard [[nodiscard]]
#elif defined(__GNUC__) || defined(__clang__)
#define c23_nodiscard __attribute__((warn_unused_result))
#elif defined(_MSC_VER)
#define c23_nodiscard _Check_return_
#else
#define c23_nodiscard
#endif
#if COMPAT_HAS_C_ATTRIBUTE(deprecated)
#define c23_deprecated [[deprecated]]
#elif defined(__GNUC__) || defined(__clang__)
#define c23_deprecated __attribute__((deprecated))
#elif defined(_MSC_VER)
#define c23_deprecated __declspec(deprecated)
#else
#define c23_deprecated
#endif
#if COMPAT_HAS_C_ATTRIBUTE(fallthrough)
#define c23_fallthrough [[fallthrough]]
#elif defined(__GNUC__) || defined(__clang__)
#define c23_fallthrough __attribute__((fallthrough))
#else
#define c23_fallthrough
#endif
#if COMPAT_HAS_C_ATTRIBUTE(maybe_unused)
#define c23_maybe_unused [[maybe_unused]]
#elif defined(__GNUC__) || defined(__clang__)
#define c23_maybe_unused __attribute__((unused))
#else
#define c23_maybe_unused
#endif