[CMake] Running a Find module only once

[Rolf Eike Beer]

Am Mittwoch, 27. November 2013, 11:38:51 schrieb Neil Carlson:
> I've created a "find" module for a library (following the example for zlib)
> which I use in a standalone project.  A second project has it as a
> subdirectory, but the second project also uses the same find module for its
> own purposes.  I'm confused about how to best ensure that the "find"
> doesn't get invoked twice; the top level project invokes it, setting
> various variables that the lower level project uses without redoing the
> find.
> 
> What are the best practices for nesting projects like this?  I was thinking
> to change the find module to define an imported library target (instead of
> a handful of variables like FindZLIB does) and then protecting the find
> inside a IF( TARGET ... ) block?  Comments?

Just don't care for it, this works for the most cases ;)

Long version: if you only do things like find_library() and find_path() those 
will simply do nothing if their target variables are already defined, which is 
the same as if you would just run CMake again in the build directory.

Eike
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