From owner-freebsd-current  Sun Jun 18 16:17:39 2000
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Date: Sun, 18 Jun 2000 19:17:26 -0400
From: Donn Miller <dmmiller@cvzoom.net>
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Subject: compiling kernel with -Os or -O2
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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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