Add "components"

tools/resources/__init__.py

@@ -135,7 +135,9 @@ class Resources(object):
 
         # Incremental scan related
         self._label_paths = []
-        self._labels = {"TARGET": [], "TOOLCHAIN": [], "FEATURE": []}
+        self._labels = {
+            "TARGET": [], "TOOLCHAIN": [], "FEATURE": [], "COMPONENT": []
+        }
         self._prefixed_labels = set()
 
         # Path seperator style (defaults to OS-specific seperator)

tools/targets/__init__.py

@@ -91,7 +91,7 @@ def cached(func):
 
 # Cumulative attributes can have values appended to them, so they
 # need to be computed differently than regular attributes
-CUMULATIVE_ATTRIBUTES = ['extra_labels', 'macros', 'device_has', 'features']
+CUMULATIVE_ATTRIBUTES = ['extra_labels', 'macros', 'device_has', 'features', 'components']
 
 
 def get_resolution_order(json_data, target_name, order, level=0):

tools/toolchains/__init__.py

@@ -224,6 +224,7 @@ class mbedToolchain:
             self.labels = {
                 'TARGET': self.target.labels,
                 'FEATURE': self.target.features,
+                'COMPONENT': self.target.components,
                 'TOOLCHAIN': toolchain_labels
             }