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
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Precedence: bulk

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
GeekCode V3.1:
GCS d- s:++ a- C++$ UL++++ P+++>++++ L+++ E--- W+ N+++ o? !K w@ O- M-
V--
PS+ PE-- Y+ PGP- t+@ 5+@ X+@ !R !tv b+++(+) DI? D+(----) G++ e+>++ h r
y?