e061d67dff
In order to avoid name clash on distributions which decide to include
kernel headers instead of UAPI ones. For example, on SLES 11SP4:
gcc -DHAVE_CONFIG_H -I./linux/x86_64 -I./linux -I. -Wall -O2 -c net.c
In file included from /usr/include/linux/sysctl.h:25:0,
from /usr/include/linux/netfilter.h:6,
from /usr/include/linux/netfilter_arp.h:8,
from /usr/include/linux/netfilter_arp/arp_tables.h:14,
from net.c:60:
net.c: In function 'print_packet_mreq':
gcc_compat.h:59:27: error: negative width in bit-field '<anonymous>'
# define MUST_BE_ARRAY(a) BUILD_BUG_ON_ZERO(!SAME_TYPE((a), &(a)[0]))
^
defs.h:76:53: note: in expansion of macro 'MUST_BE_ARRAY'
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]) + MUST_BE_ARRAY(a))
^
net.c:747:22: note: in expansion of macro 'ARRAY_SIZE'
if (mreq.mr_alen > ARRAY_SIZE(mreq.mr_address))
^
due to the fact BUILD_BUG_ON_ZERO is already defined in <linux/kernel.h>.
* gcc_compat.h (BUILD_BUG_ON_ZERO): Rename to FAIL_BUILD_ON_ZERO.
(MUST_BE_ARRAY): Update usage.
96 lines
3.3 KiB
C
96 lines
3.3 KiB
C
/*
|
|
* Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef STRACE_GCC_COMPAT_H
|
|
#define STRACE_GCC_COMPAT_H
|
|
|
|
#if defined __GNUC__ && defined __GNUC_MINOR__
|
|
# define GNUC_PREREQ(maj, min) \
|
|
((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
|
|
#else
|
|
# define __attribute__(x) /* empty */
|
|
# define GNUC_PREREQ(maj, min) 0
|
|
#endif
|
|
|
|
#if GNUC_PREREQ(2, 5)
|
|
# define ATTRIBUTE_NORETURN __attribute__((__noreturn__))
|
|
#else
|
|
# define ATTRIBUTE_NORETURN /* empty */
|
|
#endif
|
|
|
|
#if GNUC_PREREQ(2, 7)
|
|
# define ATTRIBUTE_FORMAT(args) __attribute__((__format__ args))
|
|
# define ATTRIBUTE_ALIGNED(arg) __attribute__((__aligned__(arg)))
|
|
# define ATTRIBUTE_PACKED __attribute__((__packed__))
|
|
#else
|
|
# define ATTRIBUTE_FORMAT(args) /* empty */
|
|
# define ATTRIBUTE_ALIGNED(arg) /* empty */
|
|
# define ATTRIBUTE_PACKED /* empty */
|
|
#endif
|
|
|
|
#if GNUC_PREREQ(3, 0)
|
|
# define SAME_TYPE(x, y) __builtin_types_compatible_p(typeof(x), typeof(y))
|
|
# define FAIL_BUILD_ON_ZERO(expr) (sizeof(int[-1 + 2 * !!(expr)]) * 0)
|
|
/* &(a)[0] is a pointer and not an array, shouldn't be treated as the same */
|
|
# define MUST_BE_ARRAY(a) FAIL_BUILD_ON_ZERO(!SAME_TYPE((a), &(a)[0]))
|
|
#else
|
|
# define SAME_TYPE(x, y) 0
|
|
# define MUST_BE_ARRAY(a) 0
|
|
#endif
|
|
|
|
#if GNUC_PREREQ(3, 0)
|
|
# define ATTRIBUTE_MALLOC __attribute__((__malloc__))
|
|
#else
|
|
# define ATTRIBUTE_MALLOC /* empty */
|
|
#endif
|
|
|
|
#if GNUC_PREREQ(3, 1)
|
|
# define ATTRIBUTE_NOINLINE __attribute__((__noinline__))
|
|
#else
|
|
# define ATTRIBUTE_NOINLINE /* empty */
|
|
#endif
|
|
|
|
#if GNUC_PREREQ(4, 0)
|
|
# define ATTRIBUTE_SENTINEL __attribute__((__sentinel__))
|
|
#else
|
|
# define ATTRIBUTE_SENTINEL /* empty */
|
|
#endif
|
|
|
|
#if GNUC_PREREQ(4, 1)
|
|
# define ALIGNOF(t_) __alignof__(t_)
|
|
#else
|
|
# define ALIGNOF(t_) (sizeof(struct {char x_; t_ y_;}) - sizeof(t_))
|
|
#endif
|
|
|
|
#if GNUC_PREREQ(4, 3)
|
|
# define ATTRIBUTE_ALLOC_SIZE(args) __attribute__((__alloc_size__ args))
|
|
#else
|
|
# define ATTRIBUTE_ALLOC_SIZE(args) /* empty */
|
|
#endif
|
|
|
|
#endif /* !STRACE_GCC_COMPAT_H */
|