[Bug middle-end/29609] [4.1/4.2/4.3 Regression] Even with -O0 -g gcc optimizes a goto away and I cannot debug

["hainque at adacore dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #6 from hainque at adacore dot com  2007-12-19 08:30 -------
Subject: Re:  [4.1/4.2/4.3 Regression] Even with  -O0 -g gcc optimizes a goto
away and I cannot debug

Hi Steven,

steven at gcc dot gnu dot org wrote:
> xf. http://gcc.gnu.org/ml/gcc-patches/2007-04/msg01789.html
> 
> I was wrong to object to this patch

 No problem, and many thanks for getting back to us on this issue.

 What really matters is feedback/discussion IMO, and your comments had
 us look for better ways to perform the task. This is a positive outcome
 even if we haven't (yet) pushed further for an inclusion into the FSF
 tree.

> there really doesn't seem to be any other way.  It's funny, on the
> one hand we complain about the code quality of -O0, but on the other
> we have to do quite silly things such as adding jumps to jumps to
> keep rather important debug information around...

 Right. We have several constraints at play (want to debug, want the
 ability to debug (-g) not to modify the generated code, and want to
 limit generated code bloats), and it's not always possible to progress
 on one aspect without effects on the others.

 I like the recently suggested "-Og" idea because it offers a way through.

> Olivier, any chance someone at AdaCore can pick this up and re-submit it to
> gcc-patches?

 We can definitely resubmit the current version we have (I copied the
 author). Thanks again for your feedback,

 Olivier




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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29609