On 01/18/2012 01:01 AM, Philipp Hahn wrote:
Hello Eric,
Eric Blake <eblake@redhat.com> wrote:
On 01/17/2012 04:42 AM, Philipp Hahn wrote: And what kernel is that system running?
2.6.32
That's an unusual mix, where the syscall exists (since 2.6.27) but libc is too old to use the syscall.
We already refuse to compile lxc for RHEL 5 (kernel 2.6.18), as that particular kernel is too old to usefully support namespace and other operations required by lxc.
I haven't used lxc on that particular system, but only tried to comile that newer version. configure did detect lxc itself and then failed building it, so that was the only thing to get me started looking at that issue. Since I don't need lxc on that system, I'm fine with just disabling lxc.
Then how about this patch: From 330f666036943a0fc423a4b5db2ca294fb2a4298 Mon Sep 17 00:00:00 2001 From: Eric Blake <eblake@redhat.com> Date: Thu, 19 Jan 2012 13:35:39 -0700 Subject: [PATCH] build: skip lxc with too-old glibc Since we already require the kernel to be new enough to support LO_FLAGS_AUTOCLEAR, we might as well also require glibc to be new enough to support epoll_create1(). * configure.ac (with_lxc): We require glibc 2.9 for LXC. Reported by Philipp Hahn. --- configure.ac | 7 ++++--- 1 files changed, 4 insertions(+), 3 deletions(-) diff --git a/configure.ac b/configure.ac index 729ba9b..02d60d0 100644 --- a/configure.ac +++ b/configure.ac @@ -734,16 +734,17 @@ if test "$with_lxc" = "yes" || test "$with_lxc" = "check"; then AC_TRY_LINK([ #include <sched.h> #include <linux/loop.h> + #include <sys/epoll.h> ], [ - unshare (!LO_FLAGS_AUTOCLEAR); + unshare (!(LO_FLAGS_AUTOCLEAR + EPOLL_CLOEXEC)); ], [ with_lxc=yes ], [ if test "$with_lxc" = "check"; then with_lxc=no - AC_MSG_NOTICE([Function unshare() not present in <sched.h> header but required for LXC driver, disabling it]) + AC_MSG_NOTICE([Required kernel features were not found, disabling LXC]) else - AC_MSG_ERROR([Function unshare() not present in <sched.h> header, but required for LXC driver]) + AC_MSG_ERROR([Required kernel features for LXC were not found]) fi ]) fi -- 1.7.7.5 -- Eric Blake eblake@redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org