[tools] Fixed precedence issue in cumulative attribute set-arithmetic

Basically this: a | b - c != (a | b) - c
2016-07-27 16:47:23 -05:00 · 2016-07-27 16:47:23 -05:00 · f3c0ea3664
parent b171a9c4b8
commit f3c0ea3664
1 changed files with 2 additions and 1 deletions
--- a/tools/config.py
+++ b/tools/config.py
@ -169,7 +169,8 @@ class ConfigCumulativeOverride:

    def update_target(self, target):
        setattr(target, self.name, list(
-                set(getattr(target, self.name, [])) | self.additions - self.removals))
+                (set(getattr(target, self.name, [])) | self.additions) - self.removals))
+


 # 'Config' implements the mbed configuration mechanism