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Brad King authored
In commit ff6c4013 (cmTarget: Add interface for compatible numeric properties, 2013-10-22, v3.0.0-rc1~460^2) the condition dagCheckerParent && !dagCheckerParent->EvaluatingLinkLibraries() was written that way to avoid a nullptr dereference, but is actually meant to say "is not evaluating link libraries". That can also be true when there is no `dagCheckerParent`, such as when evaluating a generator expression outside of usage requirements, e.g., for `add_custom_target`. The original commit tried to account for that by duplicating the implementation in another code path, but that did not work in all cases. Fix the condition, remove the duplication, and enable tests for the now-working cases.
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