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From Bill Stoddard <b...@wstoddard.com>
Subject Re: Modifying Win32 default optimizations?
Date Wed, 11 May 2005 13:25:54 GMT
William A. Rowe, Jr. wrote:
> I'd like to modify the Win32 build projects (of mod_jk, and
> httpd 1.3/2.0/2.1-dev, along with apr); 
> 
> The /O2 optimization option is extremely agressive, unfortunately 
> it produces less than ideal crash traceback information.  That 
> is due to the (implicit) /Oy flag, which omits respecible stack
> framing.  I'd like to change this to /O2 /Oy- to disable this
> optimization; processing will be unmeasurably slower, but far
> more useful when crashes do occur.
> 
> The /O2 optimization also simplifies the stack frame checking
> for many functions.  The /Gs0 option would restore full frame
> checks, to ensure we don't overflow the stack in the processing
> of any function.  With FirstBill's (wise) choice to reduce the
> size of our default stack frames within httpd, it seems wise to
> be extra diligent.  However, MS's docs state that /O2 implies
> /Gs - and I can't determine if that is /Gs0 (implied) or some
> other behavior.  Thoughts from someone with more experience 
> playing in stack probes would be appreciated.
> 
> All in all - comments?
> 
> Bill

+1 in concept. I'll take debugability at the cost of a small performance hit anyday.

Bill



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