Re: gcc -O2 on alpha miscompiles ifupdown?
On Fri 05 Jan 2001, Ron Farrer wrote:
> Anthony Towns (aj@azure.humbug.org.au) wrote:
>
> > Like the subject says; if I build ifupdown (0.6.4-1) on alpha with -O2
> > it breaks, if I build it with -O0, it's fine. With -O2, trying to trace
> > what's going on with gdb doesn't seem to work (it jumps all over the
> > place, fairly meaninglessly).
> I haven't looked at this (yet?), but I would guess it to be more bugs
> in gcc 2.95 we are using. If you look at the gcc 2.96 changelog you'll
> see there are quite a few bug fixes, a lot of them on Alpha. We've
> been plauged with bad gcc optimization on Alpha for about as long as I
> can remember.
>
> If no one knows for sure, I may have time in the next couple of days
> to play with it and see. Chris Chimelis (chris@debian.org) is the one
> to talk to about gcc bugs on Alpha. I would say either don't use -O2
Note that Chris is busy moving house for a couple of weeks.
I'm trying to keep up with building packages for the time being.
> (duh) or use a different gcc (probably not gonna happen anytime soon).
I've just built ifupdown 0.6.4-2, and tested it with Anthony's
interfaces.tst file, and it gives the following output:
Configuring interface lo=lo (inet)
run-parts /etc/network/if-pre-up.d
ifconfig lo 127.0.0.1 up
run-parts /etc/network/if-up.d
Configuring interface eth0=eth0 (inet)
run-parts /etc/network/if-pre-up.d
ifconfig eth0 10.254.0.104 netmask 255.255.255.0 broadcast 10.254.0.255 up
route add default gw 10.254.0.254 eth0
run-parts /etc/network/if-up.d
Configuring interface eth2=eth2 (inet)
run-parts /etc/network/if-pre-up.d
ifconfig eth2 192.168.115.1 netmask 255.255.255.0 up
run-parts /etc/network/if-up.d
Configuring interface eth3=eth3 (inet)
run-parts /etc/network/if-pre-up.d
ifconfig eth3 192.168.116.1 netmask 255.255.255.0 up
run-parts /etc/network/if-up.d
Configuring interface eth4=eth4 (inet)
run-parts /etc/network/if-pre-up.d
ifconfig eth4 192.168.117.1 netmask 255.255.255.0 up
run-parts /etc/network/if-up.d
It looks OK to me, so I've uploaded it. I didn't do anything
special (i.e. it's compiled with -O2).
Paul Slootman
--
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