"struct in6_addr"没有成员带有-ansi的名为"s6_addr32"的成员 [英] ‘struct in6_addr’ has no member named ‘s6_addr32’ with -ansi
问题描述
使用 no-asm -ansi
构建OpenSSL时,我正在解决一些编译错误.我正在捕捉错误:
I'm working through some compile errors when building OpenSSL with no-asm -ansi
. I'm catching the error:
$ ./config no-asm -ansi
...
$ make
...
gcc -DDSO_DLFCN -DHAVE_DLFCN_H -DOPENSSL_THREADS -DOPENSSL_NO_STATIC_ENGINE -DOPENSSL_PIC
-DOPENSSLDIR="\"/usr/local/ssl\"" -DENGINESDIR="\"/usr/local/lib/engines\"" -Wall -O3
-pthread -m64 -DL_ENDIAN -ansi -fPIC -Iinclude -I. -Icrypto/include -MMD -MF
crypto/bio/bss_dgram.d.tmp -MT crypto/bio/bss_dgram.o -c -o crypto/bio/bss_dgram.o
crypto/bio/bss_dgram.c
In file included from /usr/include/netdb.h:27:0,
from ./e_os.h:443,
from crypto/bio/bio_lcl.h:2,
from crypto/bio/bss_dgram.c:62:
crypto/bio/bss_dgram.c: In function ‘dgram_get_mtu_overhead’:
crypto/bio/bss_dgram.c:433:20: error: ‘const struct in6_addr’ has no member named ‘s6_addr32’
&& IN6_IS_ADDR_V4MAPPED(&tmp_addr))
^
我在/usr/include/linux/in6.h
中找到了该结构:
#if __UAPI_DEF_IN6_ADDR
struct in6_addr {
union {
__u8 u6_addr8[16];
#if __UAPI_DEF_IN6_ADDR_ALT
__be16 u6_addr16[8];
__be32 u6_addr32[4];
#endif
} in6_u;
#define s6_addr in6_u.u6_addr8
#if __UAPI_DEF_IN6_ADDR_ALT
#define s6_addr16 in6_u.u6_addr16
#define s6_addr32 in6_u.u6_addr32
#endif
};
#endif /* __UAPI_DEF_IN6_ADDR */
我不记得以前需要定义__UAPI_DEF_IN6_ADDR_ALT
了.搜索它会从内核的
I don't recall needing to define __UAPI_DEF_IN6_ADDR_ALT
in the past. Searching for it reveals the following from the kernel's libc-compat.h
, line 95 or so (if I am parsing it correctly):
#define __UAPI_DEF_IN6_ADDR 1
/* We unconditionally define the in6_addr macros and glibc must coordinate. */
#define __UAPI_DEF_IN6_ADDR_ALT 1
#define __UAPI_DEF_SOCKADDR_IN6 1
#define __UAPI_DEF_IPV6_MREQ 1
#define __UAPI_DEF_IPPROTO_V6 1
#define __UAPI_DEF_IPV6_OPTIONS 1
#define __UAPI_DEF_IN6_PKTINFO 1
#define __UAPI_DEF_IP6_MTUINFO 1
我应该如何继续定义备用符号?
How should I proceed to get the alternate symbols defined?
系统是Ubuntu 14.04(x86_64):
The system is Ubuntu 14.04 (x86_64):
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.4 LTS
Release: 14.04
Codename: trusty
GCC是:
$ gcc --version
gcc (Ubuntu 4.8.4-2ubuntu1~14.04.1) 4.8.4
Copyright (C) 2013 Free Software Foundation, Inc.
推荐答案
事实证明这很有趣...简短地说,我需要同时添加-ansi
和-D_DEFAULT_SOURCE=1
.但是,-D_DEFAULT_SOURCE=1
会撤消-ansi
试图完成的工作,因此需要将其包含在内.
This turned out to be interesting... The short of it is I needed to add both -ansi
and -D_DEFAULT_SOURCE=1
. However, -D_DEFAULT_SOURCE=1
kind of undoes what -ansi
is trying to accomplish so it needs to be contained.
首先,/usr/include/linux/in6.h
是错误的标题.我通过struct in6_addr
的grep找到了它,但没有跟踪需要完成的内容.
First, /usr/include/linux/in6.h
was the wrong header. I found it through a grep for struct in6_addr
, and not tracing includes like needed to be done.
下一步... -D_DEFAULT_SOURCE=1
间接来自/usr/include/netinet/in.h
:
Next... -D_DEFAULT_SOURCE=1
indirectly came from /usr/include/netinet/in.h
:
#ifndef __USE_KERNEL_IPV6_DEFS
/* IPv6 address */
struct in6_addr
{
union
{
uint8_t __u6_addr8[16];
#ifdef __USE_MISC
uint16_t __u6_addr16[8];
uint32_t __u6_addr32[4];
#endif
} __in6_u;
#define s6_addr __in6_u.__u6_addr8
#ifdef __USE_MISC
# define s6_addr16 __in6_u.__u6_addr16
# define s6_addr32 __in6_u.__u6_addr32
#endif
};
#endif /* !__USE_KERNEL_IPV6_DEFS */
手动启用__USE_MISC
无效.在/usr/include/features.h
中跟踪__USE_MISC
的内容:
Manually enabling __USE_MISC
did not work. Tracing things for __USE_MISC
in /usr/include/features.h
:
/*
...
__USE_MISC Define things from 4.3BSD or System V Unix.
...
*/
#undef __USE_MISC
...
#if defined _DEFAULT_SOURCE
# define __USE_MISC 1
#endif
最后,来自/usr/include/features.h
中的评论:
_DEFAULT_SOURCE The default set of features (taking precedence over __STRICT_ANSI__).
尽管_DEFAULT_SOURCE=1
与-ansi
不同,但是影响可以限制为受IN6_IS_ADDR_V4MAPPED
影响的一个源文件.也就是说,对于C源文件 crypto/bio/bss_dgram.c
:
Though _DEFAULT_SOURCE=1
diverges from -ansi
, the impact can be limited to the one source file that's affected by IN6_IS_ADDR_V4MAPPED
. That is, in for the C source file crypto/bio/bss_dgram.c
:
/* OpenSSL copyright ... */
#ifndef _DEFAULT_SOURCE
# define _DEFAULT_SOURCE 1
#endif
#include <stdio.h>
#include <errno.h>
#include <netinet/in.h>
...
摆弄__USE_KERNEL_IPV6_DEFS
会使情况变得更糟.我相信它启用了/usr/include/linux/in6.h
,其成员名称与<netinet/in.h>
类似(但完全不同).
Fiddling with __USE_KERNEL_IPV6_DEFS
made things even worse. I believe it enabled /usr/include/linux/in6.h
, which had similar (but completely different) member names than <netinet/in.h>
.
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