Date: Sun, 18 Jun 2000 19:17:26 -0400 From: Donn Miller <dmmiller@cvzoom.net> To: current@freebsd.org Subject: compiling kernel with -Os or -O2 Message-ID: <394D5886.F736F395@cvzoom.net>
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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:
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 = "GenuineIntel" Id = 0x543 Stepping = 3
Features=0x8001bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,MMX>
real memory = 62914560 (61440K bytes)
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.
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.
- Donn
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