std.digest can't CTFE?

[Sisor]

On Friday, 1 June 2018 at 14:56:32 UTC, Stefan Koch wrote:
> On Thursday, 31 May 2018 at 21:29:13 UTC, Manu wrote:
>> "CTFE
>> Digests do not work in CTFE"
>>
>>
>> That's an unfortunate limitation... why is, those things? :(
>
> Because CTFE cannot do things which are technically ABI 
> dependent.

Is there a technical reason for this? Can CTFE determine the 
endianness of the (target-) system?