[CMake] LOCATION target property, generator expressions

[Hendrik Greving]

Hello,

our cmake setup is using LOCATION property for two targets to compute a
relative path from these two, and adds this to LINK_FLAGS (for rpath, but
irrelevant in this context). In order to update our cmake w.r.t. CMP0026, I
don't know how to get LINK_FLAGS consume a generator expression. In other
cases file(GENERATE.. writing a set(var TARGET_FILE..) into a file, and
reading the file to obtain 'var' worked. Thanks in advance!
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