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

[Chris AtLee]

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
>>
>