Re: egcs-1.1.2 ping bug also causes miscompilation of pcbit isdn drive

Horst von Brand (vonbrand@inf.utfsm.cl)
Tue, 15 Jun 1999 14:14:43 -0400

Joerg Pommnitz <pommnitz@darmstadt.gmd.de> said:
> Horst von Brand wrote:
> > Come on, it can be done. Similar stuff (the myriad invalid asm constraints,
> > and assorted breakage due to better optimization by egcs) were fixed
> > without that much of a fuzz. I've been compiling my kernels with egcs
> > snapshots for something like a year and a half now...

> According to the egcs people, the aliasing framework has
> been integrated into egcs since 1.1, but it had not been
> enabled by default. gcc-2.95 (AKA egcs-1.2) will switch
> it on by default. So, you have not yet seen the true
> size of the problem.

Yes, I have. i586, _one_ function miscompiled as far as I could find
out. Kernel wouldn't boot, BTW.

> Both, Dave Miller and Andy Kleen, tried to fix the TCP
> code and gave up on it. This seems to indicate much more
> work than just a few fixed .h files and explains why Linus
> pressed so strong (and quite futile) to change the
> egcs behavior.

OK, use -fno-strict-aliasing then for the time being, clean up as you
go. It will have to be done someday anyway...

-- 
Dr. Horst H. von Brand                       mailto:vonbrand@inf.utfsm.cl
Departamento de Informatica                     Fono: +56 32 654431
Universidad Tecnica Federico Santa Maria              +56 32 654239
Casilla 110-V, Valparaiso, Chile                Fax:  +56 32 797513


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