Bruce Evans wrote:
> On Sat, 3 Aug 2002, Mike Barcroft wrote:
>>Andrew Kolchoogin <[EMAIL PROTECTED]> writes:
>>>sorry, but some time ago I read here that gcc -O2 breaks our printf() in
>>>libc. I haven't find any assembler code in /usr/src/lib/libc/stdio/vfprintf.c,
>>>as such, if some C compiler can't handle VALID and STANDARDS-COMPLIANT C code,
>>>this compiler is broken. Isn't it?
>>>Indeed, all of FreeBSD users could help to catch such a bug in gcc optimizer
>>>code. :)
>>If someone could find the small segment of code where the optimizer
>>screws up, and write a small program to demonstrate the problem, we
>>would have a good chance of it getting fixed.
> Er, someone (Dan Lukes) has already done this.  See PR 40209.  I'm sorry
> I haven't found time to look at it in detail.

O2-compiling -CURRENT (and -march=athlon ...) still manages to break 
DCCs in xchat, like:

Program received signal SIGBUS, Bus error.
0x286b3220 in __vfprintf () from /usr/lib/
(gdb) bt
#0  0x286b3220 in __vfprintf () from /usr/lib/
#1  0x286b20ca in __vfprintf () from /usr/lib/
#2  0x286ad622 in snprintf () from /usr/lib/
#3  0x08066036 in fe_dcc_update_recv ()
#4  0x08086ee0 in dcc_check_timeouts ()
#5  0x0809dd83 in lag_check ()
#6  0x2825c496 in g_timeout_dispatch () from /usr/local/lib/
#7  0x2825b658 in g_main_dispatch () from /usr/local/lib/
#8  0x2825bbf9 in g_main_iterate () from /usr/local/lib/
#9  0x2825bd86 in g_main_run () from /usr/local/lib/
#10 0x2844fa38 in gtk_main () from /usr/X11R6/lib/
#11 0x08069311 in fe_main ()
#12 0x0809e950 in main ()
#13 0x080638c1 in _start ()

Michael Nottebrock
"And the reasons? There are no reasons."

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