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02a62b551c
Recent compilers support __has_attribute() to check if a certain
compiler attribute is supported.
Unfortunately we have to first check if __has_attribute is supported in
the first place and then if a specific attribute is present.
These two checks can't be folded into a single condition as that would
lead to errors.
Nesting the two conditions like below works, but becomes ugly as soon
as #else blocks are used as those need to be duplicated for both levels
of #if.
#if defined __has_attribute
# if __has_attribute (nonnull)
# define ATTR_NONNULL __attribute__ ((nonnull))
# endif
#endif
Introduce a new helper which makes the usage of __has_attribute() nicer
and migrate the current user to it.
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20240807-nolibc-llvm-v2-4-c20f2f5fc7c2@weissschuh.net
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
28 lines
814 B
C
28 lines
814 B
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(__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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#endif /* _NOLIBC_COMPILER_H */
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