[ccache] Support for -fprofile-generate, -fprofile-use, -fprofile-arcs

[Chris AtLee]

Any thoughts on if caching the .gcda files is useful? Maybe have
another environment variable that switches it on?

Other than that, are there any other concerns with the new code?

Cheers,
Chris

On Tue, Aug 2, 2011 at 12:05 PM, Chris AtLee <chris at atlee.ca> wrote:
> If you use the same .gcda files with -fprofile-use, then you do get
> cache hits. However, running even a simple program with no loops or
> branches twice in a row generates different .gcda files, which then
> results in cache misses. So I'm not sure how useful the -fprofile-use
> side of things is in general.
>
> On Tue, Aug 2, 2011 at 11:17 AM, Justin Lebar <justin.lebar at gmail.com> wrote:
>> Catlee,
>>
>> Have you done any experiments to determine whether this actually gets
>> cache hits with -fprofile-use?  That is, do you ever get identical
>> .gcda files?  They could have a timestamp or something inside...
>>
>> -Justin
>>
>> On Mon, Aug 1, 2011 at 9:52 PM, Chris AtLee <chris at atlee.ca> wrote:
>>> Thanks again for all your feedback.
>>>
>>> My latest code on github should address all the comments so far:
>>> https://github.com/catlee/ccache/compare/jrosdahl:master...catlee:profile
>>>
>>> Keep the feedback coming!
>>>
>>> Cheers,
>>> Chris
>>>
>>
>