PowerPC 64-bit time_t

[Justin Hibbits]

On Jun 9, 2016, at 4:22 PM, Garance A Drosehn wrote:

> On 9 Jun 2016, at 13:41, Justin Hibbits wrote:
>
>> At the devsummit earlier today I mentioned for FreeBSD 12 wanting  
>> 64-bit time_t across the board.  It was pointed out that the only  
>> ones with 32-bit time_t are i386 and powerpc (32-bit).  I've made  
>> the changes necessary for at least kernel (world is still building  
>> right now), but it's obviously an ABI and KBI incompatible change.   
>> Addressing KBI is a nonissue, as that's expected to break at major  
>> releases.  ABI is another issue.  I'm unsure how to properly  
>> address ABI breakage -- bumping libc's .so version, or reversion  
>> all symbols that use something with time_t, or something else.  If  
>> I can address it before the code freeze, it could be done for  
>> FreeBSD 11, which leaves about 6 hours from now.
>>
>> Any thoughts?
>
> I don't know if it would help to look at the changes done back when
> sparc64 went to a 64-bit time_t.  I did a lot of that work, but I'll
> have to admit I remember almost nothing about the changes.
>
> -- 
> Garance Alistair Drosehn                =     drosih at rpi.edu
> Senior Systems Programmer               or   gad at FreeBSD.org
> Rensselaer Polytechnic Institute;             Troy, NY;  USA

Thanks.  The UPDATING.64BIT file you created for the upgrade path for  
sparc64 is an excellent source for the headaches involved with source  
based upgrades from 32-bit time_t to 64-bit.

- Justin