Date: Wed, 31 Oct 2007 10:43:43 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: "Stephan F. Yaraghchi" <stephan@yaraghchi.org> Cc: freebsd-current@freebsd.org Subject: Re: loader breaks with -O2 optimizations Message-ID: <47284E4F.5030008@FreeBSD.org> In-Reply-To: <25f52a3d0710300732x425f0c45vde1a29361096c018@mail.gmail.com> References: <25f52a3d0710300732x425f0c45vde1a29361096c018@mail.gmail.com>
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Stephan F. Yaraghchi wrote: > After making world on a freshly installed 7.0-BETA1 > the system does not boot anymore due to a broken loader: > > > FreeBSD/i386 bootstrap loader, Revision 1.1 > (root@bigblue, Tue Oct 30 11:26:32 CET 2007) > Can't work out which disk we are booting from. > Guessed BIOS device 0xffffffff not found by probes defaulting to disk0: > > panic: free: guard1 fail@ 0x6ded4 from > /usr/src/sys/boot/i386/loader/../../common/module.c:959 > > --> Press a key on the console to reboot <-- > > > I found out that the following line in my make.conf causes > the problem: > > CFLAGS= -O2 -funroll-loops -pipe > > > After changing down to -O1 and making /usr/src/sys/boot again > the systems behaves properly at boot. > > Is this behavior intended? Maybe, what happens if you use just -O2 -pipe? -funroll-loops is not an appropriate thing to be using globally anyway, unless your intention is to randomly make some code slower. Kris
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