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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 and tested by Philipp Hahn.
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@ -734,16 +734,17 @@ if test "$with_lxc" = "yes" || test "$with_lxc" = "check"; then
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AC_TRY_LINK([
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#include <sched.h>
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#include <linux/loop.h>
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#include <sys/epoll.h>
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], [
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unshare (!LO_FLAGS_AUTOCLEAR);
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unshare (!(LO_FLAGS_AUTOCLEAR + EPOLL_CLOEXEC));
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], [
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with_lxc=yes
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], [
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if test "$with_lxc" = "check"; then
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with_lxc=no
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AC_MSG_NOTICE([Function unshare() not present in <sched.h> header but required for LXC driver, disabling it])
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AC_MSG_NOTICE([Required kernel features were not found, disabling LXC])
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else
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AC_MSG_ERROR([Function unshare() not present in <sched.h> header, but required for LXC driver])
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AC_MSG_ERROR([Required kernel features for LXC were not found])
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fi
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])
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fi
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