[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:
> 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
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