[cfe-dev] Giving __DATE__ and __TIME__ fixed values

Nico Weber via cfe-dev cfe-dev at lists.llvm.org
Fri Aug 26 10:29:16 PDT 2016

On Wed, Aug 24, 2016 at 10:53 AM, Nico Weber <thakis at chromium.org> wrote:

> 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?

I uploaded a patch for this: https://reviews.llvm.org/D23934
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/cfe-dev/attachments/20160826/2d94db07/attachment.html>

More information about the cfe-dev mailing list