[CMake] How to use CMAKE_POLICY?

[Marcel Loose]

Op 18-12-12 13:46, David Cole schreef:
> On Mon, Dec 17, 2012 at 11:57 AM, Alexander Neundorf 
> <a.neundorf-work at gmx.net <mailto:a.neundorf-work at gmx.net>> wrote:
>
>     On Monday 17 December 2012, David Cole wrote:
>     > I thought we wanted them to switch to the new behavior... Isn't
>     that the
>     > goal of emitting warnings from policy implementations...?
>
>     ...but not as long as the project still wants to keep the old
>     minimum required
>     cmake version (or am I mixing things up) ?
>
>     Alex
>
>
>
> No, you're not mixing things up. You're correct.
>
> If somebody wants to use minimum required 2.6.2 *and* they don't like 
> warnings emitted by newer versions of CMake about new policies, then 
> they have to change their code, or use the -D 
> CMAKE_POLICY_DEFAULT_CMP<NNNN> technique.
>
> Now if they're going to change their code anyway, why not make a 
> change that is compatible with the new policy introduced rather than 
> adding a bunch of code to keep things in the OLD state. With many 
> policies it is possible to write CMake code that honors the NEW state 
> of the policy, but still works with older CMakes.
>
> I would ask for specific advice regarding the particulars of the 
> policy violation to see if there is such a way to re-write the code to 
> work with older AND newer CMakes before I would ever consider setting 
> a policy to OLD in my own CMakeLists files.
>
>
> HTH,
> David
>
>
I can send specific examples if you want. I'm not sure I can send 
attachments to the mailing list, though.

Regards,
Marcel Loose.

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