We have two ways IMHO:
1. Keep TSA optional and write a colcon mixin to enable this behavior.
2. Inject the statements you quoted everywhere using the `*-extras.cmake` mechanism.
My feeling is that, keeping this opt-in per-package will be challenging because mixing the clang and GNU standard libraries is probably unsafe. So it would need to be a global on/off flag. 2. is most likely too brutal of a change so 1. could be the best option.
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