[CMake] How to use CMAKE_POLICY?

[Marcel Loose]

On 19/12/12 17:56, David Cole wrote:
> I think the safest/wisest thing to do in this case is to update your 
> minimum required version to CMake 2.8.4, and then adjust your custom 
> code to eliminate the warning if it still occurs.
>
> 2.8.4 is more than 18 months old at this point. Is there a reason why 
> 2.6.2 is still required for some?
Yep. Old machines running old software that nobody wants to touch, 
adhering to the principle "Don't fix anything that ain't broke".

>
>
> On Wed, Dec 19, 2012 at 11:24 AM, Alexander Neundorf 
> <a.neundorf-work at gmx.net <mailto:a.neundorf-work at gmx.net>> wrote:
>
>     On Wednesday 19 December 2012, Marcel Loose wrote:
>     > Hi David,
>     >
>     > I need to set a policy to OLD, because I have wrapped a few existing
>     > Find*.cmake files to overcome some bugs or shortcomings.
>     However, since
>     > CMake 2.8.4 (or 2.8.3, I'm not sure), this triggers a policy warning
>     > CMP0017 with newer versions of CMake, because some macros are now
>     > included from my CMAKE_MODULE_PATH and some from
>     CMAKE_CURRENT_LIST_DIR,
>     > which expands to somewhere inside CMAKE_ROOT.
>
>     you get this warning if a module from CMake/Modules/ includes a
>     module from
>     outside CMake/Modules/, if the same module exists also inside
>     CMake/Modules/.
>
>     This is a serious warning, because the including module expects
>     the module
>     from the same cmake version as itself, having the features as they
>     are in this
>     version, and by getting a different file it may not get what it
>     expects.
>
>     Alex
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