[CMake] find_package_version_check

[Andreas Schneider]

Hi,

I had to add a version check to on of my find modules in KDE. So I started and 
asked myself why do I have to right so much code to get a version check. This 
should be done by CMake and not by me.

So I've created a function find_package_version_check() you can use. All you 
have to do is to set the version number.

Example:
find_package(LibSSH 0.3.2 EXACT)

# check for the version and set it
set(LibSSH_VERSION 0.4.0)
find_package_version_check(LibSSH DEFAULT_MSG)

Error:
  The installed LibSSH version 0.4.0 is too new, version 0.3.2 is required.


Comments and improvements are very welcome :)


Cheers,

	-- andreas
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