Date: Mon, 19 Jun 2000 20:37:05 +1000 From: "Jacob A. Hart" <c9710216@studentmail.newcastle.edu.au> To: Donn Miller <dmmiller@cvzoom.net> Cc: current@FreeBSD.ORG Subject: Re: compiling kernel with -Os or -O2 Message-ID: <20000619203705.A55219@carcass.au.hartware.com> In-Reply-To: <394D5886.F736F395@cvzoom.net>; from dmmiller@cvzoom.net on Sun, Jun 18, 2000 at 07:17:26PM -0400 References: <394D5886.F736F395@cvzoom.net>
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A word of advice for those who use modules:
If you've recompiled the kernel with -O and the system still won't boot, be
sure to set CFLAGS=3D"-O -pipe" in /etc/make.conf so that your modules are
also compiled with -O. A -O kernel with -O2 modules _doesn't_ work (on my
system anyway).
Now that modules are built with the kernel, perhaps COPTFLAGS should be the
optimisation variable responsible for both kernel _and_ modules?
-jake
On Sun, Jun 18, 2000 at 07:17:26PM -0400, Donn Miller wrote:
> Anyone try to compile the kernel with an optimization higher than -O,
> such as -Os or -O2? For example, when I compile my kernel with -Os, I
> get a "fatal trap 12: page fault in supervisor mode" right after I
> see this on my screen while the kernel is booting:
>=20
> Copyright (c) 1992-2000 The FreeBSD Project.
> Copyright (c) 1982, 1986, 1989, 1991, 1993
> The Regents of the University of California. All rights
> reserved.
> FreeBSD 5.0-CURRENT #0: Sun Jun 18 19:06:34 EDT 2000
> dmmiller@lc210.cvzoom.net:/usr/src/sys/compile/CUSTOM
> Timecounter "i8254" frequency 1193182 Hz
> CPU: Pentium/P55C (166.45-MHz 586-class CPU)
> Origin =3D "GenuineIntel" Id =3D 0x543 Stepping =3D 3
> Features=3D0x8001bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,MMX>
> real memory =3D 62914560 (61440K bytes)
>=20
>=20
> This is all the further the boot gets before the page fault. Of
> course, as David O'Brien pointed out, optimization levels beyond -O
> aren't supported. But, I'm curious as to what the cause of this is,
> as it may reveal a deeper problem someplace. For example, is the
> problem with binutils, the kernel source code, or both? Hopefully,
> we'll find out after the binutils upgrade is complete.
>=20
> I should point out that using -O to compile the kernel gives no
> problems booting; it's just -Os that causes the problems for me.
>=20
> - Donn
>=20
>=20
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--=20
Jacob A. Hart <c9710216@studentmail.newcastle.edu.au>
Powered by: FreeBSD 5.0-CURRENT #25: Sat Jun 17 14:16:03 EST 2000
I believe the technical term is "Oops!"
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