On Sunday, 9 March 2025 16:05:13 Pacific Daylight Time Sebastian Wittmeier via
Std-Proposals wrote:
> It probably would only make sense, if now() always returns the same value
> for each translation unit. Any other result would tempt to make time
> measurements.

I agree.

I don't like this new feature and I've said so already. I think __TIME__ is a
misfeature and have said so too.

But if this new feature is wanted, I would recommend to vendors to implement
it as:
  return time_point(seconds{ __UNIXTIME__ });

Where __UNIXTIME__ is a new macro pointing to the same time point as __TIME__,
so this gets expanded by the preprocessor and thus saved in .ii files (such as
what ccache stores).

If we do get a constexpr calendar parsing function, it can be implemented from
__DATE__ and __TIME__ too (the timezone is unimportant, because it would be
correct to within ±14h30).

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Principal Engineer - Intel DCAI Platform & System Engineering