From:	Bernard Schmitz <bernard AT hunterlink DOT net DOT au>
Newsgroups:	comp.os.msdos.djgpp
Subject:	problem with profiling with optimization...
Date:	Tue, 05 May 1998 15:31:00 +1000
Organization:	HunterLink - An Australian Network Provider
Lines:	28
Message-ID:	<354EA414.7DCA7172@hunterlink.net.au>
NNTP-Posting-Host:	new6as4.hunterlink.net.au
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Is profiling with optimization liable to break code?

I've always profiled using the flags -g -pg -m486 -O3 and
never had a problem until now.

My code was working fine compiled with debug info.  I decided to
profile it and found that it produced different results!  At first
I thought it was a bug that had only become apparent because of 
profiling/optimizing.  I compiled with optimization using -O3 -m486
-finline-functions -fomit-frame-pointer and the code worked perfectly!

Compiling the same code with profiling but no optimization works.
That will do, but I was surprised that the profiling/optimization 
affected just a small section of code, just one function in fact!

So basically is it a good idea to profile using optimization??
Can you turn off profiling for one function?

thanks

-- 
Bernard Schmitz                                
bernard AT hunterlink DOT net DOT au
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y?

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