[cfe-dev] Giving __DATE__ and __TIME__ fixed values

Reid Kleckner via cfe-dev cfe-dev at lists.llvm.org
Wed Aug 24 08:07:19 PDT 2016

It's still hacky, but I bet -U__DATE__ -D__DATE__=x still works.

Sent from phone

On Aug 24, 2016 7:53 AM, "Nico Weber via cfe-dev" <cfe-dev at lists.llvm.org>

> Hi,
> we're trying to make our build more deterministic. Several third-party
> libraries we depend on use __DATE__ and __TIME__, which makes that part of
> the build nondeterministic. So we'd like to force both of them to a fixed
> value via some flag.
> -D__DATE__= -D__TIME__= kind of works, but it triggers Wbuiltin-macro-redefined
> warnings (and it also causes a crash when using them with pchs). Is using
> -D flags the right approach for this? It seems a bit hacky. Would there be
> interest in adding a (say) -ffixed-date-time=1997-07-16T19:20+01:00 flag
> that sets the initial value of __DATE__ and __TIME__ so that we don't have
> to redefine them?
> Nico
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