element.py: Add _add_build_dependency() method

This method explicitly adds a build dependency to an Element
instance's __build_dependency list. This is required when
determining the build dependencies of an artifact

1 files changed, 10 insertions, 0 deletions

diff --git a/src/buildstream/element.py b/src/buildstream/element.py
index 78fee5dff..c44af942b 100644
--- a/src/buildstream/element.py
+++ b/src/buildstream/element.py
@@ -2366,6 +2366,16 @@ class Element(Plugin):
         assert self.__artifact, "{}: has no Artifact object".format(self.name)
         return self.__artifact
 
+    # _add_build_dependency()
+    #
+    # Add a build dependency to the Element
+    #
+    # Args:
+    #    (Element): The Element to add as a build dependency
+    #
+    def _add_build_dependency(self, dependency):
+        self.__build_dependencies.append(dependency)
+
     #############################################################
     #                   Private Local Methods                   #
     #############################################################