All C files depend on mbed_app.json

Author: theotherjimmy

tools/toolchains/__init__.py

@@ -909,7 +909,9 @@ def compile_command(self, source, object, includes):
                 deps = self.parse_dependencies(dep_path) if (exists(dep_path)) else []
             except IOError, IndexError:
                 deps = []
-            if len(deps) == 0 or self.need_update(object, deps):
+            config_file = ([self.config.app_config_location]
+                           if self.config.app_config_location else [])
+            if len(deps) == 0 or self.need_update(object, deps + config_file):
                 if ext == '.cpp' or self.COMPILE_C_AS_CPP:
                     return self.compile_cpp(source, object, includes)
                 else: