On Aug 6, 2010, at 2:04 PM, Douglas Gregor wrote:

>> 
>> Did you do any performance checking of this?  HeaderSearch::LookupFile is 
>> incredibly performance sensitive for certain things (e.g. building cocoa.h 
>> pch file) and this patch probably just slowed it down by 3x.
> 
> 
> Hrm, I did not do any performance testing. I'll run some numbers in the 
> morning and revert the patch if it causes an issue. Thanks for keeping an eye 
> out; you know I aim to make Clang slow.

I think it's best to just revert this patch.  Using sys::Path isn't the right 
solution here from a design perspective anyway.  If you revert the patch I'll 
try to look at it again in the next couple weeks.

-Chris
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