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build: more workarounds for if_bridge.h

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This is a second attempt at fixing the problem first attempted
in commit 2df8d99; basically undoing the fact that it was
reverted in commit 43cee32f, plus fixing two more issues: the
code in configure.ac has to EXACTLY match virnetdevbridge.c
with regards to declaring in6 types before using if_bridge.h,
and the fact that RHEL 5 has even more conflicts:

In file included from util/virnetdevbridge.c:49:
/usr/include/linux/in6.h:47: error: conflicting types for 'in6addr_any'
/usr/include/netinet/in.h:206: error: previous declaration of 'in6addr_any' was here
/usr/include/linux/in6.h:49: error: conflicting types for 'in6addr_loopback'
/usr/include/netinet/in.h:207: error: previous declaration of 'in6addr_loopback' was here

The rest of this commit message borrows from the original try
of 2df8d99:

A fresh checkout on a RHEL 6 machine with these packages:
kernel-headers-2.6.32-405.el6.x86_64
glibc-2.12-1.128.el6.x86_64
failed to configure with this message:
checking for linux/if_bridge.h... no
configure: error: You must install kernel-headers in order to compile libvirt with QEMU or LXC support

Digging in config.log, we see that the problem is identical to
what we fixed earlier in commit d12c2811:

configure:98831: checking for linux/if_bridge.h
configure:98853: gcc -std=gnu99 -c -g -O2  conftest.c >&5
In file included from /usr/include/linux/if_bridge.h:17,
                 from conftest.c:559:
/usr/include/linux/in6.h:31: error: redefinition of 'struct in6_addr'
/usr/include/linux/in6.h:48: error: redefinition of 'struct sockaddr_in6'
/usr/include/linux/in6.h:56: error: redefinition of 'struct ipv6_mreq'
configure:98860: $? = 1

I had not hit it earlier because I was using incremental builds,
where config.cache had shielded me from the kernel-headers breakage.

* configure.ac (if_bridge.h): Avoid conflicting type definitions.
* src/util/virnetdevbridge.c (includes): Also sanitize for RHEL 5.

Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Eric Blake 2013-08-07 10:34:08 -06:00
parent 15168f9874
commit 70024dc919
2 changed files with 15 additions and 1 deletions
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12
configure.ac
View File

@ -997,7 +997,17 @@ if test "$with_linux" = "yes"; then
if test "$with_qemu" = "yes" || test "$with_lxc" = "yes" ; then
AC_CHECK_HEADERS([linux/param.h linux/sockios.h linux/if_bridge.h linux/if_tun.h],,
[AC_MSG_ERROR([You must install kernel-headers in order to compile libvirt with QEMU or LXC support])],
[[#include <netinet/in.h>
[[/* The kernel folks broke their headers when used with particular
* glibc versions; although the structs are ABI compatible, the
* C type system doesn't like struct redefinitions. We work around
* the problem here in the same manner as in virnetdevbridge.c. */
#include <netinet/in.h>
#define in6_addr in6_addr_
#define sockaddr_in6 sockaddr_in6_
#define ipv6_mreq ipv6_mreq_
#define in6addr_any in6addr_any_
#define in6addr_loopback in6addr_loopback_
#include <linux/in6.h>
]])
fi
fi

4
src/util/virnetdevbridge.c
View File

@ -46,11 +46,15 @@
# define in6_addr in6_addr_
# define sockaddr_in6 sockaddr_in6_
# define ipv6_mreq ipv6_mreq_
# define in6addr_any in6addr_any_
# define in6addr_loopback in6addr_loopback_
# include <linux/in6.h>
# include <linux/if_bridge.h> /* SYSFS_BRIDGE_ATTR */
# undef in6_addr
# undef sockaddr_in6
# undef ipv6_mreq
# undef in6addr_any
# undef in6addr_loopback
# define JIFFIES_TO_MS(j) (((j)*1000)/HZ)
# define MS_TO_JIFFIES(ms) (((ms)*HZ)/1000)