Warning about __DATE__ and __TIME__

[Tobias Burnus]

Gerald Pfeifer wrote:
> To make it easier to reproduce builds of software and entire GNU/Linux
> distributions, RMS had the idea of adding a warning to GCC that warns
> about the use of __DATE__ and __TIME__.

I assume that he also likes to have a warning for __TIMESTAMP__.

> I was thinking a new warning -Wdate-time or similar could address
> this.
> Any volunteers implementing this?

Do you mean something like the attached patch? (Only lightly tested.)

Tobias
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