config: Support targets with sector attributes

Fixes #182

Author: cyliangtw

news/182.bugfix

@@ -0,0 +1 @@
+Support compilation of targets with sector attributes in targets.json.

src/mbed_tools/build/_internal/config/source.py

@@ -44,8 +44,10 @@ def prepare(
     namespace = data.pop("name", source_name)
     for key in data:
         if isinstance(data[key], list):
-            data[key] = set(data[key])
-
+            try:
+                data[key] = set(data[key])
+            except TypeError:
+                data[key] = set(*data[key])
     if "config" in data:
         data["config"] = _extract_config_settings(namespace, data["config"])
 

tests/build/_internal/config/test_source.py

@@ -109,8 +109,10 @@ def test_converts_config_setting_value_lists_to_sets(self):
         lib = {
             "name": "library",
             "config": {"list-values": {"value": ["ETHERNET", "WIFI"]}},
+            "sectors": [[0, 2048]],
         }
 
         conf = source.prepare(lib)
 
         assert conf["config"][0].value == {"ETHERNET", "WIFI"}
+        assert conf["sectors"] == {0, 2048}