[CMake] Version compatibility?

[Nils Gladitz]

On 04/25/2016 02:29 PM, Craig Scott wrote:
> I personally have found myself having to look up to his sort of 
> version info a lot lately. It sounds like others do too. Perhaps a 
> more sustainable approach would be to include the version details in 
> the CMAKE docs themselves. For each command, module, variable, etc. 
> it's documentation could state the version it was added. Some may 
> warrant further info for version(s) where significant changes were 
> made (eg keywords added to a command). Realistically, it would have to 
> be done progressively and obviously with agreement from the Kitware 
> side. It would only work if it became part of the change process 
> whereby any new features or changes must include such version details. 
> It would be interesting to hear what Kitware think of the idea. Any 
> chance?

I've also made use of such information from time to time but I think it 
has been the exception and it doesn't normally come up during my regular 
development workflow.

I assume for most projects there is a single 
cmake_minimum_required(VERSION).
Which means to see what is and what isn't available I only have to check 
that specific version's documentation.

I am curious as to what kind of use case results in having to require 
cross-version information as provided by the compatibility matrix "a lot".

Nils
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