Element: Substitute variables on dependency configurations

This was missing in the initial implementation.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/buildstream/element.py b/src/buildstream/element.py
index 06327baf1..9348dff48 100644
--- a/src/buildstream/element.py
+++ b/src/buildstream/element.py
@@ -1122,6 +1122,12 @@ class Element(Plugin):
 
                     # Class supports dependency configuration
                     if dep.config_nodes:
+
+                        # Ensure variables are substituted first
+                        #
+                        for config in dep.config_nodes:
+                            element.__variables.expand(config)
+
                         custom_configurations.extend(
                             [DependencyConfiguration(dep_proxy, dep.path, config) for config in dep.config_nodes]
                         )