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Re: PR/15448: add a compiler timestamp to PCH files
Paolo Bonzini <paolo.bonzini@lu.unisi.ch> writes:
> > While, this would be good, it isn't the fix to the problem you
> > describe. The way to add better validation would be to add __TIME__
> > to the compiler and validate it across PCH usage. This way, if the
> > compiler is ever rebuilt, we get a new timestamp, which then will
> > kill all PCH files.
>
> Unless I am misunderstanding you, we were speaking of the same solution.
I think it would be simpler and more efficient to pick a set of
relevant compiler global variables and functions and hash their
addresses together. If those are well chosen, it will be very
unlikely to generate a PCH with same hash code that will not work.
Ian