vlib: packet tracer support for pkt thread handoffs

Type: feature

Change-Id: Ia3d9a47679202c2a47cd3746b50e86c6b8627ef6
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/src/vlib/CMakeLists.txt b/src/vlib/CMakeLists.txt
index acd6635..1cecf5f 100644
--- a/src/vlib/CMakeLists.txt
+++ b/src/vlib/CMakeLists.txt
@@ -52,6 +52,7 @@
   drop.c
   error.c
   format.c
+  handoff_trace.c
   i2c.c
   init.c
   linux/pci.c