Detect OS upgrades and refer users to Migration

[Rainer Müller]

On 2013-11-17 14:44, Ryan Schmidt wrote:
> On Nov 17, 2013, at 06:57, Rainer Müller wrote:
>> On 2013-11-06 17:25, Daniel J. Luke wrote:
>>> On Nov 6, 2013, at 5:06 AM, Rainer Müller wrote:
>>>>
>>>> As our base system is already targeting a specific OS release, we should
>>>> just store the platform it was built for in *_autoconf.tcl and issue an
>>>> error if that does not match on launch.
>>>
>>> That sounds good to me.
>>
>> Implemented now on trunk:
>> http://trac.macports.org/changeset/113478
> 
> Thanks. I see you’re checking OS_PLATFORM and OS_MAJOR. Could we check OS_ARCH as well?

That's difficult as the distributed pkg installers for Tiger and Leopard
are universal. Therefore it's not a fixed value, but from a list of
supported archs.

However, there is no configure option for that list yes, as only the
MacPorts Portfile passes multiple -arch options to the compiler and does
not tell configure about it.

Rainer