[CMake] Adding Cmake version in online documentation

[Nils Gladitz]

On 09.11.2016 14:57, Ruslan Baratov wrote:
>
> Again policies are not meant to be feature toggles.
> You can do a lot of things and there may be valid use cases but in 
> general policies are not meant to be used this way.
> This is made explicit in CMake's documentation on policies.
> They exist to preserve backwards compatibility not to pick and choose 
> behaviours.
>
> So can you show an example of "valid" use of `cmake_policy` command?
>

To quote the documentation:
"A policy is a deprecation mechanism and not a reliable feature toggle. 
A policy should almost never be set to |OLD|, except to silence warnings 
in an otherwise frozen or stable codebase, or temporarily as part of a 
larger migration path."

Beyond that valid use would be e.g. cmake's own testsuite which needs to 
be able to toggle individual policies to verify their behaviour.

Nils

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