[CMake] Version checking in FindFoo.cmake modules

[Matt Williams]

I was reading up on the documentation on the 2.6 version of find_package() and 
it seems that being able to pass a version string to it only works if 
find_package() uses a FooConfig.cmake file and not a FindFoo.cmake file.

In other words, if I'm writing a FindFoo.cmake file, it seems that the 
PACKAGE_FIND_NAME, PACKAGE_FIND_VERSION etc. variables aren't set.

I tried to make it work but I couldn't. Am I missing something or is it really 
not possible to do version checking with FindFoo.cmake modules?

Matt Williams
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