configure.ac: add lsns option

lsns unconditionally uses NS_GET_NSTYPE since version 2.38 and
https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/commit/?id=de72df79d72fa906e71e2ac922d8745ff22deee5
which is only available since kernel 4.11 and
https://github.com/torvalds/linux/commit/e5ff5ce6e20ee22511398bb31fb912466cf82a36
resulting in the following build failure:

sys-utils/lsns.c: In function 'add_namespace_for_nsfd':
sys-utils/lsns.c:719:25: error: 'NS_GET_NSTYPE' undeclared (first use in this function)
  719 |  clone_type = ioctl(fd, NS_GET_NSTYPE);
      |                         ^~~~~~~~~~~~~

So add an option to allow the user to disable lsns

Fixes:
 - http://autobuild.buildroot.org/results/572ecf8e37ac733a4e4265f4f78f35230337278e

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>

diff --git a/configure.ac b/configure.ac
index 11c86b9a70809cbade98539b17fb2e1186984ebb..52c5b280a55e0d8ae04379f5777afce7747c9067 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1922,7 +1922,11 @@ UL_REQUIRES_LINUX([lsipc])
 UL_REQUIRES_BUILD([lsipc], [libsmartcols])
 AM_CONDITIONAL([BUILD_LSIPC], [test "x$build_lsipc" = xyes])
 
-UL_BUILD_INIT([lsns], [check])
+AC_ARG_ENABLE([lsns],
+  AS_HELP_STRING([--disable-lsns], [do not build lsns]),
+  [], [UL_DEFAULT_ENABLE([lsns], [check])]
+)
+UL_BUILD_INIT([lsns])
 UL_REQUIRES_LINUX([lsns])
 UL_REQUIRES_BUILD([lsns], [libsmartcols])
 UL_REQUIRES_BUILD([lsns], [libmount])