[Bug 1922417] Re: [SRU] cmake: FindPkgConfig: imported target missing libraries

[Gianfranco Costamagna]

Hello Robie, the cmake if I understand correctly checks the list of libraries returned from pkg-config call, and adds them only if found on the system.
The problem is that if the pkgconfig call has a -L *but* libraries listed somewhere else (e.g. in standard ld.so.conf path), the call strips them from the list.

So, in this case you get a subset of libraries returned to cmake, and
with this patch, the list of libraries will increase (not decrease).
With a default as-needed flag turned on, the side effect will be to have
them ignored in such cases, nothing to worry about.

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Title:
  [SRU] cmake: FindPkgConfig: imported target missing libraries

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