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Date:      Fri, 20 Jul 2001 09:34:44 +0930
From:      Greg Lehey <grog@FreeBSD.org>
To:        "Karsten W. Rohrbach" <karsten@rohrbach.de>
Cc:        Gordon Tetlow <gordont@gnf.org>, Stewart Morgan <stewart@nameless-uk.com>, freebsd-stable@FreeBSD.ORG
Subject:   Re: PANIC in FFS -- Please HELP!
Message-ID:  <20010720093444.M24616@wantadilla.lemis.com>
In-Reply-To: <20010719173242.O39506@mail.webmonster.de>; from karsten@rohrbach.de on Thu, Jul 19, 2001 at 05:32:42PM %2B0200
References:  <000001c10fb2$ed07a0e0$0f01000a@saturn> <Pine.LNX.4.33.0107182000480.19368-100000@smtp.gnf.org> <20010719173242.O39506@mail.webmonster.de>

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On Thursday, 19 July 2001 at 17:32:42 +0200, Karsten W. Rohrbach wrote:
> Gordon Tetlow(gordont@gnf.org)@2001.07.18 20:04:41 +0000:
>> On Wed, 18 Jul 2001, Stewart Morgan wrote:
>>
>>> CPUTYPE=i686
>>>
>>> CFLAGS=-O -pipe -felide-constructors -mcpu=pentiumpro -march=pentiumpro
>>> -ffast-math -felide-constructors -fexpensive-optimizations
>>> -funroll-loops -funroll-all-loops -fmemoize-lookups -fsave-memoized
>>> -fno-strength-reduce
>>>
>>> CXXFLAGS+=-O -pipe -felide-constructors -mcpu=pentiumpro
>>> -march=pentiumpro -ffast-math -felide-constructors
>>> -fexpensive-optimizations -funroll-loops -funroll-all-loops
>>> -fmemoize-lookups -fsave-memoized -fno-strength-reduce
>>>
>>> COPTFLAGS=-O -pipe -felide-constructors -mcpu=pentiumpro
>>> -march=pentiumpro -ffast-math -felide-constructors
>>> -fexpensive-optimizations -funroll-loops -funroll-all-loops
>>> -fmemoize-lookups -fsave-memoized -fno-strength-reduce
>>>
>>>
>>
>> I feel obligated to point out the warning from /etc/defaults/make.conf:
>>
>> # CFLAGS controls the compiler settings used when compiling C code.
>> # Note that optimization settings above -O (-O2, ...) are not recommended
>> # or supported for compiling the world or the kernel - please revert any
>> # nonstandard optimization settings to "-O" before submitting bug reports
>> # to the developers.
>>
>> Please try your setup with the a "normal" CFLAGS (ie -O -pipe) and then
>> see if you get a reproducible panic. If you do, then report it to the
>> mailing list. Otherwise, you are a victim of a *known* bad code optimizer
>> which you were warned about.
>
> has anybody tried gcc-3.0's code generation yet?

Yes.  It's not industry strength yet.

Greg
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