[CMake] Generator expression for "is in list"?

[Sam Edwards]

Hello list!

I'm trying to write a generator expression that only evaluates if my target
is directly (not transitively) linked into the consuming target. I figured
the easiest way to do that would be to test if the target's name appears in
$<TARGET_PROPERTY:LINK_LIBRARIES>, however I'm not seeing a generator
expression for substring or "string in list" tests.

What is the preferred way to accomplish this?

Best,
Sam
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