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Re: Using "-O1 -g" to debug optimisation bugs in Mingw.

From: John Darrington
Subject: Re: Using "-O1 -g" to debug optimisation bugs in Mingw.
Date: Wed, 4 Apr 2007 06:05:53 +0800
User-agent: Mutt/1.5.13 (2006-08-11)

Another thing you might try:  from the GCC manual, -O1 is equivalent
to :

So it might be worth trying to find the minimal combination of these
flags which exhibit the problem.


On Wed, Apr 04, 2007 at 12:11:04AM +0800, John McCabe-Dansted wrote:
     I've mentioned previously many of the bugs in the Mingw port go away
     if we compile with -O0.
     Most of them come back if we compile with -O1. I understand that O1
     code is meant to be reasonable to debug, so we may be able to diagnose
     those problems by debugging code generated with "-O1 -g".
     I intend to (as John D suggested offlist) also write a script to
     change the compile options on each .o file and see which ones seem to
     be causing the bugs.

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