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37219aa5b1
Add a wrapper for _Static_assert() to use within nolibc. While _Static_assert() itself was only standardized in C11, in GCC and clang dialects it is also available in older standards. Link: https://lore.kernel.org/lkml/20251203192330.GA12995@1wt.eu/ Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Link: https://patch.msgid.link/20251220-nolibc-uapi-types-v3-13-c662992f75d7@weissschuh.net
74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* NOLIBC compiler support header
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* Copyright (C) 2023 Thomas Weißschuh <linux@weissschuh.net>
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*/
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#ifndef _NOLIBC_COMPILER_H
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#define _NOLIBC_COMPILER_H
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#if defined(__has_attribute)
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# define __nolibc_has_attribute(attr) __has_attribute(attr)
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#else
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# define __nolibc_has_attribute(attr) 0
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#endif
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#if defined(__has_feature)
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# define __nolibc_has_feature(feature) __has_feature(feature)
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#else
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# define __nolibc_has_feature(feature) 0
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#endif
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#define __nolibc_aligned(alignment) __attribute__((aligned(alignment)))
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#define __nolibc_aligned_as(type) __nolibc_aligned(__alignof__(type))
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#if __nolibc_has_attribute(naked)
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# define __nolibc_entrypoint __attribute__((naked))
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# define __nolibc_entrypoint_epilogue()
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#else
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# define __nolibc_entrypoint __attribute__((optimize("Os", "omit-frame-pointer")))
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# define __nolibc_entrypoint_epilogue() __builtin_unreachable()
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#endif /* __nolibc_has_attribute(naked) */
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#if defined(__SSP__) || defined(__SSP_STRONG__) || defined(__SSP_ALL__) || defined(__SSP_EXPLICIT__)
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#define _NOLIBC_STACKPROTECTOR
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#endif /* defined(__SSP__) ... */
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#if __nolibc_has_attribute(no_stack_protector)
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# define __no_stack_protector __attribute__((no_stack_protector))
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#else
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# define __no_stack_protector __attribute__((__optimize__("-fno-stack-protector")))
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#endif /* __nolibc_has_attribute(no_stack_protector) */
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#if __nolibc_has_attribute(__fallthrough__)
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# define __nolibc_fallthrough do { } while (0); __attribute__((__fallthrough__))
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#else
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# define __nolibc_fallthrough do { } while (0)
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#endif /* __nolibc_has_attribute(fallthrough) */
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#define __nolibc_version(_major, _minor, _patch) ((_major) * 10000 + (_minor) * 100 + (_patch))
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#ifdef __GNUC__
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# define __nolibc_gnuc_version \
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__nolibc_version(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
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#else
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# define __nolibc_gnuc_version 0
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#endif /* __GNUC__ */
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#ifdef __clang__
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# define __nolibc_clang_version \
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__nolibc_version(__clang_major__, __clang_minor__, __clang_patchlevel__)
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#else
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# define __nolibc_clang_version 0
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#endif /* __clang__ */
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#if __STDC_VERSION__ >= 201112L || \
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__nolibc_gnuc_version >= __nolibc_version(4, 6, 0) || \
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__nolibc_clang_version >= __nolibc_version(3, 0, 0)
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# define __nolibc_static_assert(_t) _Static_assert(_t, "")
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#else
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# define __nolibc_static_assert(_t)
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#endif
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#endif /* _NOLIBC_COMPILER_H */
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