[CMake] rules for writing cmake modules

[Filipe Sousa]

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Alexander Neundorf wrote:

> Should it print some status messages on success/failure ? 

In my own modules I use MESSAGE(STATUS when LibFOO_FIND_QUIETLY is not set

> Should it MESSAGE(FATAL_ERROR "Foo not found") on failure ? 

and MESSAGE(FATAL_ERROR when LibFOO_FIND_REQUIRED is defined. That way
FIND_PACKAGE(LibFOO QUIET REQUIRED) only shows fatal errors.

LibFOO_FIND_QUIETLY and LibFOO_FIND_REQUIRED are variables created
automatically by FIND_PACKAGE

- --
Filipe Sousa
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