[uml-devel] Re: [uml-user] SuSE 9.1 host + 2.4.26 Kernel + GCC 3.3.3 similarities to 2.6.6!?

[uml <uml@dot1q.net>]

> answering myself:
>
> via google i found:
> >Two different xterms emulators dumping core ... I'd be concerned a
> >wee bit. One note, do not compile with excessive optimizations and
> >especially -fschedule-insns and -fschedule-insns2 is the right way  <-
!!!
> >to produce faulty code with all gcc / egcs releases since 2.8.0     <-
!!!
> >on I86 machines. Not that it would make much sense with a terminal
> >emulator anyway, but even so.
>
> and:
> >linked to the Pentium Pro Blas single processor library.
If -fschedule-insns
> >is included four examples - 06, 07, 09 and 30 fail, 06 and 09 with
segmentation  <-- !!!
> >fault and 09 and 30 with a message that "SCALAR MECHINES SHOULD NOT CALL
JKGNMV".
> >The performance is sometimes better and sometimes worse over the 31
examples, but
> >these are really too small for a proper bennch mark.
>
> and:
> > ..so I guess the problem is not the classic --fschedule-insns bug.
That's the option I found several weeks ago that gave me issues.

> and:
> http://www.linux-mips.org/archives/linux-mips/2004-03/msg00032.html
>
> could please someone try putting -fno-schedule-insns (and
maybe -fno-schedule-insns2)
> into the Makefile(s) and try again ?
I'm having issues with at least -fno-schedule-insns -- where in the
arch/um/Makefile do I make the change as well (or do I?)


So I tried the following combos:
perl -e 's/-O2/-O2 -fno-schedule-insns/g' -p -i.bak Makefile
arch/um/Makefile
perl -e 's/-O2/-O2 -fno-schedule-insns2/g' -p -i.bak Makefile
arch/um/Makefile
perl -e 's/-O2/-O2 -fno-schedule-insns -fno-schedule-insns2/g' -p -i.bak
Makefile arch/um/Makefile

No dice on any of them.

I don't believe there is a -O2 in arch/um/Makefile as there is in 2.6.6 -- 
should I make a change to the CFLAGS there?



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