From help-request at octave dot org Wed Jan 19 23:23:39 2005
Subject: Re: Building Octave on cygwin with gcc3.3.3
From: "Paul Thomas" <paulthomas2 at wanadoo dot fr>
To: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>,         "Frank Palazzolo" <frank.palazzolo@mcm1.com>
Cc: <help at octave dot org>
Date: Thu, 20 Jan 2005 06:27:27 +0100


> I'm pretty sure the problem is with SJLJ exception handling being much
> slower than the method used with Dwarf2.  The reason the problem shows
> up with new/delete is because new throws an exception if it fails.  So

That's correct

> If SJLJ exception handling is used by MinGW, then I don't think you'll
> see an improvement.
>

That is what is being reported by those stalwarts who are trying MinGW.

For what it is worth, I notice that the time penalty for new/delete goes 
away with the builds of gcc-4.0 that I am using for gfortran development. 
There is a small problem with libgfortran that I have on my list of todo's, 
in order that octave can be built.  I'll put that next on the list.  In the 
mean time, I will build a Cygwin gcc-3.4 this weekend and build octave with 
that.  I am rather sure that the --version information that gcc is a Mingw 
special is a "bad stuff" indicator.

Paul T 




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