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Date:      Sat, 6 Nov 1999 16:07:06 +1100 (EST)
From:      Bruce Evans <bde@zeta.org.au>
To:        "David O'Brien" <obrien@FreeBSD.ORG>
Cc:        current@FreeBSD.ORG
Subject:   Re: show stopper for Gcc 2.95.2 conversion
Message-ID:  <Pine.BSF.4.10.9911061555100.5557-100000@alphplex.bde.org>
In-Reply-To: <19991105140415.A25486@dragon.nuxi.com>

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On Fri, 5 Nov 1999, David O'Brien wrote:

> The current show stopper for switching over to GCC 2.95.2 is a problem
> compiling the `ahc' driver:
> 
> cc -c -O -pipe -Wall -Wredundant-decls -Wnested-externs
>     -Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Winline
>     -Wcast-qual  -fformat-extensions -ansi  -nostdinc -I- -I. -I../..
>     -I../../../include  -DKERNEL -include opt_global.h -elf
>     ../../dev/aic7xxx/aic7xxx.c
> ../../dev/aic7xxx/aic7xxx.c: In function `ahc_download_instr':
> machine/bus.h:584: Invalid `asm' statement:
> machine/bus.h:584: fixed or forbidden register 2 (cx) was spilled for class CREG.
> *** Error code 1

The asm statement is broken.  The clobber list shouldn't include any
registers that are explicitly allocated as operands.  See rev.1.85 of
<machine/cpufunc.h> where this bug was fixed for several functions
that used to have it there.  Many functions in <machine/bus.h> have the
same bug.

> The message is misleading, as the problematic header is
> /sys/i386/include/bus.h not, /usr/include/machine/bus.h.

It's actually machine/bus.h, where "machine" is the symlink to
../../i386/include in the compile directory.  This is correct.

Bruce



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