[Bug preprocessor/71851] Get more time granularity at preprocessing

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71851

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #2)
> Any kind of such code goes strongly against build reproduceability,
> -fcompare-debug etc., so not sure it would be really appreciated, it is a
> direction against various changes done in gcc lately.
> I think if you need something like that just pass
> -DRANDOM=`dd if=/dev/random bs=8 count=1 2>/dev/null | md5sum | awk '{print
> $1}'`
> or something similar.

I think he wants to have a new random value each time __RANDOM is "evaluated"
(during C++ template instantiation - thus a preprocessor macro isn't really
apppropriate).