Thanks for tracking the issue! Just checked the code and there is the following part https://gitlab.kitware.com/cmake/cmake/blob/v3.6.3/Source/cmGeneratorExpressionNode.cxx#L944 which you will hit when adding LINK_LIBRARIES to the list of items to expand transitively. If I understand this part correctly then this shouldn't be a real problem as the recursion could as well happen in INCLUDE_DIRECTORIES, but please correct me if I am wrong here.
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