** Description changed:
The eglibc netinet/in.h macros to deal with IPv6 address classes are
- broken in stricts conformance mode because they access symbols that are
+ broken in strict conformance mode because they access symbols that are
not expose in strict conformance mode.
The macros should be looking at s6_addr, rather than s6_addr32.
Download the attached try.c and then see:
: this is relaxed mode:
$ gcc -c -Wall -Wextra -std=gnu99 /tmp/try.c -o /tmp/try.o
(no console output -> success)
: this is conformance mode (c99 instead of gnu99):
$ LC_ALL=C gcc -c -Wall -Wextra -std=c99 /tmp/try.c -o /tmp/try.o
/tmp/try.c: In function 'f':
/tmp/try.c:5:18: error: 'const struct in6_addr' has no member named
's6_addr32'
/tmp/try.c:5:18: error: 'const struct in6_addr' has no member named
's6_addr32'
/tmp/try.c:5:18: error: 'const struct in6_addr' has no member named
's6_addr32'
Line numbers in try.c are:
- 1 #include <netinet/in.h>
- 2
- 3 int f(void) {
- 4 struct sockaddr_in6 sa;
- 5 int result = IN6_IS_ADDR_V4MAPPED(&sa.sin6_addr);
- 6 return result;
- 7 }
+ 1 #include <netinet/in.h>
+ 2
+ 3 int f(void) {
+ 4 struct sockaddr_in6 sa;
+ 5 int result = IN6_IS_ADDR_V4MAPPED(&sa.sin6_addr);
+ 6 return result;
+ 7 }
POSIX:
- The <netinet/in.h> header shall define the in6_addr structure that
contains at
- least the following member:
+ The <netinet/in.h> header shall define the in6_addr structure that
contains at
+ least the following member:
- uint8_t s6_addr[16]
+ uint8_t s6_addr[16]
So s6_addr32 is unavailable in strict mode (this is deliberate through
preprocessing inside in.h near line 209):
- 197 /* IPv6 address */
- 198 struct in6_addr
- 199 {
- 200 union
- 201 {
- 202 uint8_t __u6_addr8[16];
- 203 #if defined __USE_MISC || defined __USE_GNU
- 204 uint16_t __u6_addr16[8];
- 205 uint32_t __u6_addr32[4];
- 206 #endif
- 207 } __in6_u;
- 208 #define s6_addr __in6_u.__u6_addr8
- 209 #if defined __USE_MISC || defined __USE_GNU
- 210 # define s6_addr16 __in6_u.__u6_addr16
- 211 # define s6_addr32 __in6_u.__u6_addr32
- 212 #endif
- 213 };
- 214
-
+ 197 /* IPv6 address */
+ 198 struct in6_addr
+ 199 {
+ 200 union
+ 201 {
+ 202 uint8_t __u6_addr8[16];
+ 203 #if defined __USE_MISC || defined __USE_GNU
+ 204 uint16_t __u6_addr16[8];
+ 205 uint32_t __u6_addr32[4];
+ 206 #endif
+ 207 } __in6_u;
+ 208 #define s6_addr __in6_u.__u6_addr8
+ 209 #if defined __USE_MISC || defined __USE_GNU
+ 210 # define s6_addr16 __in6_u.__u6_addr16
+ 211 # define s6_addr32 __in6_u.__u6_addr32
+ 212 #endif
+ 213 };
+ 214
+
Workaround:
- #define _GNU_SOURCE
+ #define _GNU_SOURCE
_before_ the very first #include line in the same compilation unit (.c file)
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: libc6-dev 2.15-0ubuntu10.4
ProcVersionSignature: Ubuntu 3.2.0-45.70-generic 3.2.44
Uname: Linux 3.2.0-45-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.0.1-0ubuntu17.2
Architecture: amd64
Date: Tue Jun 4 10:30:53 2013
MarkForUpload: True
ProcEnviron:
- LANGUAGE=de_DE:en
- TERM=xterm
- PATH=(custom, no user)
- LANG=de_DE.UTF-8
- SHELL=/bin/bash
+ LANGUAGE=de_DE:en
+ TERM=xterm
+ PATH=(custom, no user)
+ LANG=de_DE.UTF-8
+ SHELL=/bin/bash
SourcePackage: eglibc
UpgradeStatus: No upgrade log present (probably fresh install)
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https://bugs.launchpad.net/bugs/1187301
Title:
netinet/in.h address check macros such as IN6_IS_ADDR_V4MAPPED broken
in strict conformance mode (gcc -std=c99)
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