Add -fauto-profile option to Clang driver

[Chandler Carruth]

On Tue, Oct 22, 2013 at 10:17 AM, Diego Novillo <dnovillo at google.com> wrote:

> On Tue, Oct 22, 2013 at 1:13 PM, Chandler Carruth <chandlerc at google.com>
> wrote:
>
> > I'm surprised -- I expected this to essentially only be used with
> > sample-based profiles? Bob seemed to have a different architecture in
> mind
> > for other profile sources?
>
> For now, sure.  But there are other profile sources that are not based
> on sampling.  Instrumentation being one. Value tracking, being
> another. AFAIR, Bob is looking at instrumentation-based approaches.
>
> > If this is going to be something generic, we should have some input from
> Bob
> > as well at least. And then the flag name it seems should be "-fprofile"
> or
> > "-fprofile-file" or "-fprofile-input"....
>
> Sure. No qualification seems the best option here.


I wonder if the better way to go is to start with a very narrow flag name,
and generalize it when the infrastructure for more generalized profile
reading arrives? Supporting a highly specific flag for a long time doesn't
seem like a high cost.
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