cp: ensure backups are created when -T specified

* src/cp.c (do_copy): When -T is specified, initialize
the NEW_DST and SB variables, which are checked when
running: cp -T --force --backup file file
* tests/cp/backup-1: Add the -T case

1 files changed, 2 insertions, 0 deletions

diff --git a/src/cp.c b/src/cp.c
index 5b14f3a7b..3d00b5f7f 100644
--- a/src/cp.c
+++ b/src/cp.c
@@ -604,6 +604,8 @@ do_copy (int n_files, char **file, const char *target_directory,
           error (0, 0, _("extra operand %s"), quote (file[2]));
           usage (EXIT_FAILURE);
         }
+      /* Update NEW_DST and SB, which may be checked below.  */
+      ignore_value (target_directory_operand (file[n_files -1], &sb, &new_dst));
     }
   else if (!target_directory)
     {