Message-Id: <m13FaNw-0001zHC@chkw386.ch.pwr.wroc.pl>
Date: Fri, 21 Jul 2000 10:50:28 +0000 ()
From: strasbur AT chkw386 DOT ch DOT pwr DOT wroc DOT pl (Krzysztof Strasburger)
To: pgcc AT delorie DOT com
Subject: Re: Problems compiling kernel with pgcc 2.95.2
Reply-To: pgcc AT delorie DOT com

Brian Foddy <bfoddy AT mn DOT mediaone DOT net> wrote:
>with pgcc 2.95.2 loaded.  I am trying to build a kernel on this machine
>for a Pentium 100 (no MMX) running Mandrake 6.1.  The result of every
>normal compile is a kernel that will not boot.  I see the loading
>message after lilo with most of the dots, then the machine reboots.
Pgcc probably inserts P6 instructions into the code, even if it should not
do it. I have seen similar problem with the userland program. It ran fine
on P6, but failed to work on P5 (compiled with -march=pentium, of course).
So, "Pentium GCC" became "Pentium Pro GCC":].
>Also, if I build a PentiumPro kernel for the P2, it seems to work fine
>also.
They are both based on the P6 core.
For pentiums, I downgraded to pgcc 1.0.3a. It seems to be the latest
version with bugs documented well. It produces working code, if the
"unstable" compiler options are not used. I also don't trust the 2.91.66
release (egcs/pgcc 1.1.2). Egcs 2.91.66 gives bogus code, when the quantum
chemistry program Gaussian is compiled with it. I had also problems with
other floating point intensive code compiled with pgcc-1.1.
Krzysztof