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core-attribute.h
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/*
* Copyright (C) 2024-2025 Colin Ian King
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef CORE_ATTRIBUTE_H
#define CORE_ATTRIBUTE_H
/* warn unused attribute */
#if defined(HAVE_ATTRIBUTE_WARN_UNUSED_RESULT) && \
((defined(HAVE_COMPILER_GCC_OR_MUSL) && NEED_GNUC(4, 2, 0)) || \
(defined(HAVE_COMPILER_CLANG) && NEED_CLANG(3, 0, 0)))
#define WARN_UNUSED __attribute__((warn_unused_result))
#else
#define WARN_UNUSED
#endif
#if defined(HAVE_ATTRIBUTE_FAST_MATH) && \
!defined(HAVE_COMPILER_ICC) && \
defined(HAVE_COMPILER_GCC_OR_MUSL) && \
NEED_GNUC(10, 0, 0)
#define OPTIMIZE_FAST_MATH __attribute__((optimize("fast-math")))
#else
#define OPTIMIZE_FAST_MATH
#endif
/* no return hint */
#if defined(HAVE_ATTRIBUTE_NORETURN) && \
((defined(HAVE_COMPILER_GCC_OR_MUSL) && NEED_GNUC(2, 5, 0)) || \
(defined(HAVE_COMPILER_CLANG) && NEED_CLANG(3, 0, 0)))
#define NORETURN __attribute__((noreturn))
#else
#define NORETURN
#endif
/* weak attribute */
#if defined(HAVE_ATTRIBUTE_WEAK) && \
((defined(HAVE_COMPILER_GCC_OR_MUSL) && NEED_GNUC(4, 0, 0)) || \
(defined(HAVE_COMPILER_CLANG) && NEED_CLANG(3, 4, 0)))
#define WEAK __attribute__((weak))
#define HAVE_WEAK_ATTRIBUTE
#else
#define WEAK
#endif
/* packed attribute */
#if defined(HAVE_ATTRIBUTE_PACKED) && \
((defined(HAVE_COMPILER_GCC_OR_MUSL) && NEED_GNUC(4, 0, 0)) || \
(defined(HAVE_COMPILER_CLANG) && NEED_CLANG(3, 4, 0)))
#define PACKED __attribute__((packed))
#else
#define PACKED
#endif
#if defined(ALWAYS_INLINE)
#undef ALWAYS_INLINE
#endif
/* force inlining hint */
#if defined(HAVE_ATTRIBUTE_ALWAYS_INLINE) && \
((defined(HAVE_COMPILER_GCC_OR_MUSL) && NEED_GNUC(3, 4, 0) \
&& ((!defined(__s390__) && !defined(__s390x__)) || NEED_GNUC(6, 0, 1))) || \
(defined(HAVE_COMPILER_CLANG) && NEED_CLANG(3, 0, 0)))
#define ALWAYS_INLINE __attribute__((always_inline))
#else
#define ALWAYS_INLINE
#endif
/* force no inlining hint */
#if defined(HAVE_ATTRIBUTE_NOINLINE) && \
((defined(HAVE_COMPILER_GCC_OR_MUSL) && NEED_GNUC(3, 4, 0)) || \
(defined(HAVE_COMPILER_CLANG) && NEED_CLANG(3, 0, 0)))
#define NOINLINE __attribute__((noinline))
#else
#define NOINLINE
#endif
/* -O3 attribute support */
#if defined(HAVE_COMPILER_GCC_OR_MUSL) && \
!defined(HAVE_COMPILER_CLANG) && \
!defined(HAVE_COMPILER_ICC) && \
NEED_GNUC(4, 6, 0)
#define OPTIMIZE3 __attribute__((optimize("-O3")))
#else
#define OPTIMIZE3
#endif
/* -O2 attribute support */
#if defined(HAVE_COMPILER_GCC_OR_MUSL) && \
!defined(HAVE_COMPILER_CLANG) && \
!defined(HAVE_COMPILER_ICC) && \
NEED_GNUC(4, 6, 0)
#define OPTIMIZE2 __attribute__((optimize("-O2")))
#else
#define OPTIMIZE2
#endif
/* -O1 attribute support */
#if defined(HAVE_COMPILER_GCC_OR_MUSL) && \
!defined(HAVE_COMPILER_CLANG) && \
!defined(HAVE_COMPILER_ICC) && \
NEED_GNUC(4, 6, 0)
#define OPTIMIZE1 __attribute__((optimize("-O1")))
#else
#define OPTIMIZE1
#endif
/* -O0 attribute support */
#if defined(HAVE_COMPILER_GCC_OR_MUSL) && \
!defined(HAVE_COMPILER_ICC) && \
NEED_GNUC(4, 6, 0)
#define OPTIMIZE0 __attribute__((optimize("-O0")))
#elif (defined(HAVE_COMPILER_CLANG) && NEED_CLANG(10, 0, 0))
#define OPTIMIZE0 __attribute__((optnone))
#else
#define OPTIMIZE0
#endif
#if ((defined(HAVE_COMPILER_GCC_OR_MUSL) && NEED_GNUC(3, 3, 0)) || \
(defined(HAVE_COMPILER_CLANG) && NEED_CLANG(3, 0, 0)) || \
(defined(HAVE_COMPILER_ICC) && NEED_ICC(2021, 0, 0))) && \
!defined(HAVE_COMPILER_PCC) && \
!defined(__minix__)
#define ALIGNED(a) __attribute__((aligned(a)))
#else
#define ALIGNED(a)
#endif
/* Force alignment macros */
#define ALIGN128 ALIGNED(128)
#define ALIGN64 ALIGNED(64)
#define ALIGN8 ALIGNED(8)
#if (defined(HAVE_COMPILER_GCC_OR_MUSL) && NEED_GNUC(4, 6, 0)) || \
(defined(HAVE_COMPILER_CLANG) && NEED_CLANG(3, 0, 0))
#if (defined(__APPLE__) && defined(__MACH__))
#define SECTION(s) __attribute__((__section__(# s "," # s)))
#else
#define SECTION(s) __attribute__((__section__(# s)))
#endif
#else
#define SECTION(s)
#endif
#if defined(HAVE_ATTRIBUTE_PURE)
#define PURE __attribute__((pure))
#else
#define PURE
#endif
#if defined(HAVE_ATTRIBUTE_NONSTRING) && \
(defined(HAVE_COMPILER_GCC_OR_MUSL) && NEED_GNUC(15, 0, 0))
#define NONSTRING __attribute__((nonstring))
#else
#define NONSTRING
#endif
/* GCC mlocked data and data section attribute */
#if ((defined(HAVE_COMPILER_GCC_OR_MUSL) && NEED_GNUC(4, 6, 0) || \
(defined(HAVE_COMPILER_CLANG) && NEED_CLANG(3, 0, 0)))) && \
!defined(__sun__) && \
!defined(__APPLE__) && \
!defined(BUILD_STATIC)
#define MLOCKED_TEXT __attribute__((__section__("mlocked_text")))
#define MLOCKED_SECTION (1)
#else
#define MLOCKED_TEXT
#endif
/* print format attribute */
#if ((defined(HAVE_COMPILER_GCC_OR_MUSL) && NEED_GNUC(3, 2, 0)) || \
(defined(HAVE_COMPILER_CLANG) && NEED_CLANG(3, 0, 0)))
#define FORMAT(func, a, b) __attribute__((format(func, a, b)))
#else
#define FORMAT(func, a, b)
#endif
#if defined(HAVE_ATTRIBUTE_RETURNS_NONNULL) && \
(defined(HAVE_COMPILER_GCC_OR_MUSL) && NEED_GNUC(7, 5, 0))
#define RETURNS_NONNULL __attribute__((returns_nonnull))
#else
#define RETURNS_NONNULL
#endif
#endif