Add version selection for the SquashFS root filesystem

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

fs/squashfs/Config.in

@@ -2,3 +2,22 @@ config BR2_TARGET_ROOTFS_SQUASHFS
 	bool "squashfs root filesystem"
 	help
 	  Build a squashfs root filesystem
+
+if BR2_TARGET_ROOTFS_SQUASHFS
+choice
+	prompt "SquashFS version"
+	default BR2_TARGET_ROOTFS_SQUASHFS4
+	help
+	  Select the Squash filesystem version to use to generate the
+	  root filesystem.
+
+config BR2_TARGET_ROOTFS_SQUASHFS4
+       bool "4.x"
+
+config BR2_TARGET_ROOTFS_SQUASHFS3
+       depends on BR2_DEPRECATED
+       bool "3.x"
+
+endchoice
+endif
+

fs/squashfs/squashfs.mk

@@ -4,7 +4,11 @@
 #
 #############################################################
 
+ifeq ($(BR2_TARGET_ROOTFS_SQUASHFS4),y)
 ROOTFS_SQUASHFS_DEPENDENCIES = host-squashfs
+else
+ROOTFS_SQUASHFS_DEPENDENCIES = host-squashfs3
+endif
 
 define ROOTFS_SQUASHFS_CMD
 	$(HOST_DIR)/usr/bin/mksquashfs $(TARGET_DIR) $$@ -noappend