[ccache] ccacje direct mode without fall back to running the preprocessor

[vkr]

Hi Andrew,
> It's not the right implementation for the master branch, but might be ok in
> the release branch?

Why is that? I mean, when drop preprocessing only when an env variable is set,
why is it not the right approach?

Regards,
Venkrao

On Mon, Sep 8, 2014 at 4:32 PM, Andrew Stubbs <ams at codesourcery.com> wrote:
> On 08/09/14 11:37, vkr wrote:
>>
>> If the env variable TRS_CCACHE_NO_PREPROCESSOR_ON_DIRECT_LOOKUP_MISS is
>> set
>> then, I do not run preprocessing, but just fall back to running
>> real-compiler.
>>
>> I see a lot of time saving, and I can't think of any side-effect.
>
>
> It's not the right implementation for the master branch, but might be ok in
> the release branch?
>
> That's up to Joel.
>
> Seems like a worthwhile feature, in read-only mode.
>
> Andrew
>