build: add plugin dependencies only when present

This fixes build for VPP_EXTERNAL_PROJECT plugin with missing
PLUGIN_API_FILES.

Type: fix
Signed-off-by: Ruslan Babayev <ruslan@babayev.com>
Change-Id: I687bedcd828d834b0a7de1363f0b2d063f75ee17

diff --git a/src/cmake/plugin.cmake b/src/cmake/plugin.cmake
index c165b59..aca90ab 100644 (file)
--- a/src/cmake/plugin.cmake
+++ b/src/cmake/plugin.cmake
@@ -56,7 +56,9 @@ macro(add_vpp_plugin name)
   if(NOT VPP_EXTERNAL_PROJECT)
     list(APPEND deps vpp_version_h api_headers)
   endif()
-  add_dependencies(${plugin_name} ${deps})
+  if(deps)
+    add_dependencies(${plugin_name} ${deps})
+  endif()
   set_target_properties(${plugin_name} PROPERTIES
     PREFIX ""
     LIBRARY_OUTPUT_DIRECTORY ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/vpp_plugins)