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8918dc42dc
Some functions in bpftool have a "__printf()" format attributes to tell
the compiler they should expect printf()-like arguments. But because
these attributes are not used for the function prototypes in the header
files, the compiler does not run the checks everywhere the functions are
used, and some mistakes on format string and corresponding arguments
slipped in over time.
Let's move the __printf() attributes to the correct places.
Note: We add guards around the definition of GCC_VERSION in
tools/include/linux/compiler-gcc.h to prevent a conflict in jit_disasm.c
on GCC_VERSION from headers pulled via libbfd.
Fixes: c101189bc9 ("tools: bpftool: fix -Wmissing declaration warnings")
Reported-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _TOOLS_LINUX_COMPILER_H_
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#error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."
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#endif
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/*
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* Common definitions for all gcc versions go here.
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*/
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#ifndef GCC_VERSION
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#define GCC_VERSION (__GNUC__ * 10000 \
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+ __GNUC_MINOR__ * 100 \
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+ __GNUC_PATCHLEVEL__)
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#endif
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#if GCC_VERSION >= 70000 && !defined(__CHECKER__)
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# define __fallthrough __attribute__ ((fallthrough))
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#endif
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#if GCC_VERSION >= 40300
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# define __compiletime_error(message) __attribute__((error(message)))
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#endif /* GCC_VERSION >= 40300 */
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/* &a[0] degrades to a pointer: a different type from an array */
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#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
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#ifndef __pure
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#define __pure __attribute__((pure))
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#endif
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#define noinline __attribute__((noinline))
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#ifndef __packed
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#define __packed __attribute__((packed))
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#endif
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#ifndef __noreturn
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#define __noreturn __attribute__((noreturn))
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#endif
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#ifndef __aligned
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#define __aligned(x) __attribute__((aligned(x)))
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#endif
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#define __printf(a, b) __attribute__((format(printf, a, b)))
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#define __scanf(a, b) __attribute__((format(scanf, a, b)))
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#if GCC_VERSION >= 50100
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#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
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#endif
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