package/systemd: add --enable/disable-lz4

Signed-off-by: Gabe Evans <gabe@hashrabbit.co>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/systemd/Config.in

@@ -56,7 +56,8 @@ config BR2_PACKAGE_SYSTEMD
 	  The selection of other packages will enable some features:
 
 	  - acl package will add support for multi-seat.
-	  - xz package will add compression support in journal and coredump.
+	  - xz and/or l4 packages will add compression support in
+	    journal and coredump.
 	  - libgcrypt package will add support for journal sealing and
 	    DNSSEC verification in resolved.
 

package/systemd/systemd.mk

@@ -87,6 +87,13 @@ else
 SYSTEMD_CONF_OPTS += --disable-bzip2
 endif
 
+ifeq ($(BR2_PACKAGE_LZ4),y)
+SYSTEMD_DEPENDENCIES += lz4
+SYSTEMD_CONF_OPTS += --enable-lz4
+else
+SYSTEMD_CONF_OPTS += --disable-lz4
+endif
+
 ifeq ($(BR2_PACKAGE_XZ),y)
 SYSTEMD_DEPENDENCIES += xz
 SYSTEMD_CONF_OPTS += --enable-xz