[CMake] How to properly write a Module/<Package>Config.cmake file

[Pablo Yanez Trujillo]

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Hi

I'm reading http://www.cmake.org/cmake/help/cmake2.6docs.html#command:find_package for the usage of FIND_PACKAGE, but
I'm not interested in using the FIND_PACKAGE command but to write a Module so that anybody is able to use
FIND_PACKAGE(myLib ...).

I don't really unterstand what exactly is done by FIND_PACKAGE. The docu states that FIND_PACKAGES searches for
FindmyLib.cmake and executes it. If the package is found then the variables myLib_FOUND is set. But who sets this
variable? FIND_PACKAGE or FindmyLib.cmake? And how does FIND_PACKAGE know that a package was not found?

My second question is:
the simple signature is of FIND_PACKAGE is
find_package(<package> [version] [EXACT] [QUIET]
               [[REQUIRED|COMPONENTS] [components...]])

How does FindmyLib.cmake get the version argument of the FIND_PACKAGE call?

What is really the difference between FindmyLib.cmake and myLibConfig.cmake? When should I write the first one and when
the second one? Or should I always write both?

Thanks

Pablo

- --
Pablo Yanez Trujillo
http://klingsor.informatik.uni-freiburg.de
My public key: http://klingsor.informatik.uni-freiburg.de/gpg/supertux.asc
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