[cfe-users] Improve compile performance when using Clang 3.6

[Jeffrey Walton]

Hi Alexey,

>> Is there anything obvious I am missing that might affect the
>> performance between 3.5 and 3.6? Like is something enabled that used
>> to be disabled or missing?
>>
>> Otherwise, below is what a typical compiler invocation looks like. In
>> the past, it performed fine. Does it set off any red flags for anyone?
>>
>> For completeness, I'm trying to run self tests under the sanitizers.
>> I'm interested in the dynamic analysis at this point, and not static
>> analysis provided by ccc-analyze and friends.
>
> Interesting. Could you share the performance numbers, and try to figure out
> which specific sanitizer
> is causing a problem (i.e. try to compare just -fsanitize=address, and then
> various flavors of -fsanitize=undefined
> one by one: -fsanitize=shift, -fsanitize=null etc.). We are not aware of
> known performance degradation under
> sanitizers in 3.6 release.

Yes, will do.

I should have the performance data between 3.5 and 3.6 later tonight.
I blew out my Clang 3.5 install, so I need to fetch it and build it
again.

Jeff