don't build init.lxc.static if libcap.a isn't available

Note that building init.lxc.static still requires a static libutil.a
and libpthread.a, but these are available on most distro's through
glibc-static.

Signed-off-by: Dwight Engen <dwight.engen@oracle.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>

configure.ac

@@ -266,6 +266,19 @@ if test "x$have_abs_cgroups" = "xyes"; then
 else
 	AC_MSG_RESULT([no])
 fi
+
+# Check for static libcap, make sure the function checked for differs from the
+# the one checked below so the cache doesn't give a wrong answer
+OLD_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -static"
+AC_CHECK_LIB([cap],[cap_init],[have_static_libcap=yes],[have_static_libcap=no])
+AM_CONDITIONAL([HAVE_STATIC_LIBCAP], [test "x$have_static_libcap" = "xyes"])
+if test "x$have_static_libcap" = "xyes"; then
+	AC_DEFINE([HAVE_STATIC_LIBCAP], 1, [Have static libcap])
+fi
+CFLAGS="$OLD_CFLAGS"
+
+
 # Linux capabilities
 AC_ARG_ENABLE([capabilities],
 	[AC_HELP_STRING([--enable-capabilities], [enable kernel capabilities support [default=auto]])],

src/lxc/Makefile.am

@@ -199,7 +199,7 @@ bin_PROGRAMS = \
 	lxc-usernsexec \
 	lxc-wait
 
-sbin_PROGRAMS = init.lxc init.lxc.static
+sbin_PROGRAMS = init.lxc
 pkglibexec_PROGRAMS = \
 	lxc-monitord \
 	lxc-user-nic
@@ -233,6 +233,9 @@ lxc_snapshot_SOURCES = lxc_snapshot.c
 lxc_usernsexec_SOURCES = lxc_usernsexec.c
 lxc_user_nic_SOURCES = lxc_user_nic.c network.c network.h
 
+if HAVE_STATIC_LIBCAP
+sbin_PROGRAMS += init.lxc.static
+
 init_lxc_static_SOURCES = lxc_init.c error.c log.c utils.c caps.c
 
 if !HAVE_GETLINE
@@ -243,6 +246,7 @@ endif
 
 init_lxc_static_LDFLAGS = -static
 init_lxc_static_LDADD = @CAP_LIBS@
+endif
 
 install-exec-local: install-soPROGRAMS
 	mkdir -p $(DESTDIR)$(datadir)/lxc