Dmitry V. Levin
0b03de74bc
* gcc_compat.h (ATTRIBUTE_FALLTHROUGH): New macro. * block.c (block_ioctl): Use it instead of "fall through" comment. * btrfs.c (btrfs_ioctl): Likewise. * loop.c (loop_ioctl): Likewise. * mtd.c (mtd_ioctl): Likewise. * rtc.c (rtc_ioctl): Likewise. * v4l2.c (v4l2_ioctl): Likewise. * dm.c (dm_decode_values): Likewise. * process.c (SYS_FUNC(ptrace)): Likewise. * quota.c (decode_cmd_data): Likewise. * ucopy.c (umovestr): Likewise. * unwind.c (unwind_print_stacktrace, unwind_capture_stacktrace)): Likewise. * term.c (term_ioctl): Add ATTRIBUTE_FALLTHROUGH. * ioctl.c (ioctl_decode) [ALPHA || POWERPC]: Likewise. * m4/st_warn_cflags.m4 (gl_WARN_ADD): Add -Wimplicit-fallthrough=5. * tests/ioctl_v4l2.c (init_v4l2_format): Reorganize the switch statement without implicit fallthrough.
103 lines
3.5 KiB
C
103 lines
3.5 KiB
C
/*
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* Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2015-2017 The strace developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef STRACE_GCC_COMPAT_H
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#define STRACE_GCC_COMPAT_H
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#if defined __GNUC__ && defined __GNUC_MINOR__
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# define GNUC_PREREQ(maj, min) \
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((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
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#else
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# define __attribute__(x) /* empty */
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# define GNUC_PREREQ(maj, min) 0
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#endif
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#if GNUC_PREREQ(2, 5)
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# define ATTRIBUTE_NORETURN __attribute__((__noreturn__))
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#else
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# define ATTRIBUTE_NORETURN /* empty */
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#endif
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#if GNUC_PREREQ(2, 7)
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# define ATTRIBUTE_FORMAT(args) __attribute__((__format__ args))
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# define ATTRIBUTE_ALIGNED(arg) __attribute__((__aligned__(arg)))
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# define ATTRIBUTE_PACKED __attribute__((__packed__))
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#else
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# define ATTRIBUTE_FORMAT(args) /* empty */
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# define ATTRIBUTE_ALIGNED(arg) /* empty */
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# define ATTRIBUTE_PACKED /* empty */
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#endif
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#if GNUC_PREREQ(3, 0)
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# define SAME_TYPE(x, y) __builtin_types_compatible_p(typeof(x), typeof(y))
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# define FAIL_BUILD_ON_ZERO(expr) (sizeof(int[-1 + 2 * !!(expr)]) * 0)
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/* &(a)[0] is a pointer and not an array, shouldn't be treated as the same */
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# define MUST_BE_ARRAY(a) FAIL_BUILD_ON_ZERO(!SAME_TYPE((a), &(a)[0]))
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#else
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# define SAME_TYPE(x, y) 0
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# define MUST_BE_ARRAY(a) 0
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#endif
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#if GNUC_PREREQ(3, 0)
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# define ATTRIBUTE_MALLOC __attribute__((__malloc__))
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#else
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# define ATTRIBUTE_MALLOC /* empty */
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#endif
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#if GNUC_PREREQ(3, 1)
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# define ATTRIBUTE_NOINLINE __attribute__((__noinline__))
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#else
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# define ATTRIBUTE_NOINLINE /* empty */
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#endif
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#if GNUC_PREREQ(4, 0)
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# define ATTRIBUTE_SENTINEL __attribute__((__sentinel__))
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#else
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# define ATTRIBUTE_SENTINEL /* empty */
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#endif
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#if GNUC_PREREQ(4, 1)
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# define ALIGNOF(t_) __alignof__(t_)
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#else
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# define ALIGNOF(t_) (sizeof(struct { char x_; t_ y_; }) - sizeof(t_))
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#endif
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#if GNUC_PREREQ(4, 3)
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# define ATTRIBUTE_ALLOC_SIZE(args) __attribute__((__alloc_size__ args))
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#else
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# define ATTRIBUTE_ALLOC_SIZE(args) /* empty */
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#endif
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#if GNUC_PREREQ(7, 0)
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# define ATTRIBUTE_FALLTHROUGH __attribute__((__fallthrough__))
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#else
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# define ATTRIBUTE_FALLTHROUGH ((void) 0)
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#endif
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#endif /* !STRACE_GCC_COMPAT_H */
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