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Re: [Qemu-devel] [PATCH] Add gcc 4.0 support

From: John Davidorff Pell
Subject: Re: [Qemu-devel] [PATCH] Add gcc 4.0 support
Date: Wed, 29 Mar 2006 09:03:02 -0800

I was just thinking that by enabling the required feature individually, someone else could choose -O0 and not have to investigate why it fails. Its not like its a big deal, though. :-)


P.S. Why does the list set the reply-to header, isn't that supposed to be a Bad Thing™?

On 29 Mar 2006, at 01:59, Thiemo Seufer wrote:

On Tue, Mar 28, 2006 at 08:26:27PM -0800, John Davidorff Pell wrote:
Out of curiosity, wouldn't it be better to specifically request that
feature of gcc, with one of its myriad options, rather than forcing a
rather large optimization sweep? I'm sure that -O2 is good generally,
but using it as a kludge to get at one of the many things that it
enables seems like a not-so-great-idea. Its like buying a restaurant
so that you can get a chef's stove.

Well, I went through the ppc disassembly and found no reason to
disable -O2. Note that it was the default before, I only noticed
the breakage when I lowered the global optimisation to -O0 for better


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