File syn_compiler.h¶

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#ifndef SYN_COMPILER_H
#define SYN_COMPILER_H

#ifdef __cplusplus
extern "C" {
#endif

/* ── Compiler detection ─────────────────────────────────────────────────── */

#if defined(__GNUC__) || defined(__clang__)
#define SYN_COMPILER_GCC_LIKE 1
#elif defined(__ARMCC_VERSION)
#define SYN_COMPILER_ARMCC 1
#elif defined(__IAR_SYSTEMS_ICC__)
#define SYN_COMPILER_IAR 1
#else
#define SYN_COMPILER_UNKNOWN 1
#endif

/* ── SYN_WEAK ──────────────────────────────────────────────────────────── */
#if defined(SYN_COMPILER_GCC_LIKE)
#define SYN_WEAK __attribute__((weak))
#elif defined(SYN_COMPILER_ARMCC)
#define SYN_WEAK __weak
#elif defined(SYN_COMPILER_IAR)
#define SYN_WEAK __weak
#else
#define SYN_WEAK
#endif

/* ── SYN_PACKED ────────────────────────────────────────────────────────── */
#if defined(SYN_COMPILER_GCC_LIKE)
#define SYN_PACKED __attribute__((packed))
#elif defined(SYN_COMPILER_ARMCC)
#define SYN_PACKED __attribute__((packed))
#elif defined(SYN_COMPILER_IAR)
#define SYN_PACKED /* IAR uses #pragma pack — see SYN_PRAGMA_PACK */
#else
#define SYN_PACKED
#endif

/* ── SYN_INLINE ────────────────────────────────────────────────────────── */
#if defined(SYN_COMPILER_GCC_LIKE)
#define SYN_INLINE static inline __attribute__((always_inline))
#elif defined(SYN_COMPILER_ARMCC)
#define SYN_INLINE static __forceinline
#elif defined(SYN_COMPILER_IAR)
#define SYN_INLINE _Pragma("inline=forced") static inline
#else
#define SYN_INLINE static inline
#endif

/* ── SYN_UNUSED ────────────────────────────────────────────────────────── */
#if defined(SYN_COMPILER_GCC_LIKE)
#define SYN_UNUSED __attribute__((unused))
#else
#define SYN_UNUSED
#endif

/* ── SYN_NORETURN ──────────────────────────────────────────────────────── */
#if defined(SYN_COMPILER_GCC_LIKE)
#define SYN_NORETURN __attribute__((noreturn))
#elif defined(SYN_COMPILER_ARMCC)
#define SYN_NORETURN __attribute__((noreturn))
#elif defined(SYN_COMPILER_IAR)
#define SYN_NORETURN __noreturn
#else
#define SYN_NORETURN
#endif

/* ── SYN_STATIC_ASSERT ────────────────────────────────────────────────── */
#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L)
#define SYN_STATIC_ASSERT(expr, msg) _Static_assert(expr, msg)
#else
/* C99 fallback: negative-size array trick */
#define SYN_STATIC_ASSERT_JOIN2(a, b) a##b
#define SYN_STATIC_ASSERT_JOIN(a, b) SYN_STATIC_ASSERT_JOIN2(a, b)
#define SYN_STATIC_ASSERT(expr, msg) \
    typedef char SYN_STATIC_ASSERT_JOIN(syn_static_assert_, __LINE__)[(expr) ? 1 : -1]
#endif

/* ── SYN_SECTION ───────────────────────────────────────────────────────── */
#if defined(SYN_COMPILER_GCC_LIKE)
#define SYN_SECTION(name) __attribute__((section(name)))
#elif defined(SYN_COMPILER_ARMCC)
#define SYN_SECTION(name) __attribute__((section(name)))
#elif defined(SYN_COMPILER_IAR)
#define SYN_SECTION(name) @name
#else
#define SYN_SECTION(name)
#endif

/* ── SYN_ALIGN ─────────────────────────────────────────────────────────── */
#if defined(SYN_COMPILER_GCC_LIKE)
#define SYN_ALIGN(n) __attribute__((aligned(n)))
#elif defined(SYN_COMPILER_ARMCC)
#define SYN_ALIGN(n) __attribute__((aligned(n)))
#elif defined(SYN_COMPILER_IAR)
#define SYN_ALIGN(n) /* IAR uses #pragma data_alignment */
#else
#define SYN_ALIGN(n)
#endif

/* ── SYN_COMPILER_BARRIER ──────────────────────────────────────────────── */
#if defined(SYN_COMPILER_GCC_LIKE)
#define SYN_COMPILER_BARRIER() __asm volatile("" ::: "memory")
#elif defined(SYN_COMPILER_ARMCC)
#define SYN_COMPILER_BARRIER() __asm volatile("" ::: "memory")
#elif defined(SYN_COMPILER_IAR)
#define SYN_COMPILER_BARRIER() __asm volatile("" ::: "memory")
#else
#define SYN_COMPILER_BARRIER() ((void)0)
#endif

/* ── SYN_FALLTHROUGH ───────────────────────────────────────────────────── */
#if defined(SYN_COMPILER_GCC_LIKE)
#if __GNUC__ >= 7
#define SYN_FALLTHROUGH __attribute__((fallthrough))
#else
#define SYN_FALLTHROUGH /* fall through */
#endif
#else
#define SYN_FALLTHROUGH
#endif

#ifdef __cplusplus
}
#endif

#endif /* SYN_COMPILER_H */