openbios cross compile fails with gcc 5.2

[Cole Robinson]

Hi all,

openbios fails to build with gcc 5.2 cross compilers. This is using fedora 23
packages. There's a bug here with complete info:

https://bugzilla.redhat.com/show_bug.cgi?id=1282890

The error is:

powerpc64-linux-gnu-gcc $EXTRACFLAGS -m32 -msoft-float -fno-builtin-bcopy
-fno-builtin-log2 -Os -g -DNATIVE_BITWIDTH_EQUALS_HOST_BITWIDTH
-USWAP_ENDIANNESS -Wall -Wredundant-decls -Wshadow -Wpointer-arith
-Wstrict-prototypes -Wmissing-declarations -Wundef -Wendif-labels
-Wstrict-aliasing -Wwrite-strings -Wmissing-prototypes -Wnested-externs
-Werror -MMD -MP -MT target/arch/ppc/qemu/ofmem.o -MF
'target/arch/ppc/qemu/ofmem.d' -I/root/openbios/openbios-1.1/include
-I/root/openbios/openbios-1.1/kernel/include -I./target/include -c -o
target/arch/ppc/qemu/ofmem.o /root/openbios/openbios-1.1/arch/ppc/qemu/ofmem.c
/tmp/ccznzzOd.s: Assembler messages:
/tmp/ccznzzOd.s:551: Error: missing operand
rules.mak:309: recipe for target 'target/arch/ppc/qemu/ofmem.o' failed
make[1]: *** [target/arch/ppc/qemu/ofmem.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory '/root/openbios/openbios-1.1/obj-ppc'
Makefile:32: recipe for target 'subdir-ppc' failed
make: *** [subdir-ppc] Error 2
error: Bad exit status from /var/tmp/rpm-tmp.DSB86j (%build)

David Howells' commented in the bug with a suggested fix... but I don't even
have a setup to test openbios so I'd prefer if someone else cooks up the patch :)

Thanks,
Cole

[Mark Cave-Ayland]

On 21/11/15 02:03, Cole Robinson wrote:
> Hi all,
>
> openbios fails to build with gcc 5.2 cross compilers. This is using fedora 23
> packages. There's a bug here with complete info:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1282890
>
> The error is:
>
> powerpc64-linux-gnu-gcc $EXTRACFLAGS -m32 -msoft-float -fno-builtin-bcopy
> -fno-builtin-log2 -Os -g -DNATIVE_BITWIDTH_EQUALS_HOST_BITWIDTH
> -USWAP_ENDIANNESS -Wall -Wredundant-decls -Wshadow -Wpointer-arith
> -Wstrict-prototypes -Wmissing-declarations -Wundef -Wendif-labels
> -Wstrict-aliasing -Wwrite-strings -Wmissing-prototypes -Wnested-externs
> -Werror -MMD -MP -MT target/arch/ppc/qemu/ofmem.o -MF
> 'target/arch/ppc/qemu/ofmem.d' -I/root/openbios/openbios-1.1/include
> -I/root/openbios/openbios-1.1/kernel/include -I./target/include -c -o
> target/arch/ppc/qemu/ofmem.o /root/openbios/openbios-1.1/arch/ppc/qemu/ofmem.c
> /tmp/ccznzzOd.s: Assembler messages:
> /tmp/ccznzzOd.s:551: Error: missing operand
> rules.mak:309: recipe for target 'target/arch/ppc/qemu/ofmem.o' failed
> make[1]: *** [target/arch/ppc/qemu/ofmem.o] Error 1
> make[1]: *** Waiting for unfinished jobs....
> make[1]: Leaving directory '/root/openbios/openbios-1.1/obj-ppc'
> Makefile:32: recipe for target 'subdir-ppc' failed
> make: *** [subdir-ppc] Error 2
> error: Bad exit status from /var/tmp/rpm-tmp.DSB86j (%build)
>
> David Howells' commented in the bug with a suggested fix... but I don't even
> have a setup to test openbios so I'd prefer if someone else cooks up the patch :)

My understanding is that the earliest CPU we need to be supporting for
PPC is the 750 (which should be POWER7 series) although there was
interest in using OpenBIOS for PReP which I believe is a 604?

Hervé/Laurent in particular - any further thoughts on this?

ATB,

Mark.

[Programmingkid]

On Nov 21, 2015, at 7:46 AM, Mark Cave-Ayland wrote:
> On 21/11/15 02:03, Cole Robinson wrote:
> > Hi all,
> >
> > openbios fails to build with gcc 5.2 cross compilers. This is using fedora 23
> > packages. There's a bug here with complete info:
> >
> > https://bugzilla.redhat.com/show_bug.cgi?id=1282890
> >
> > The error is:
> >
> > powerpc64-linux-gnu-gcc $EXTRACFLAGS -m32 -msoft-float -fno-builtin-bcopy
> > -fno-builtin-log2 -Os -g -DNATIVE_BITWIDTH_EQUALS_HOST_BITWIDTH
> > -USWAP_ENDIANNESS -Wall -Wredundant-decls -Wshadow -Wpointer-arith
> > -Wstrict-prototypes -Wmissing-declarations -Wundef -Wendif-labels
> > -Wstrict-aliasing -Wwrite-strings -Wmissing-prototypes -Wnested-externs
> > -Werror -MMD -MP -MT target/arch/ppc/qemu/ofmem.o -MF
> > 'target/arch/ppc/qemu/ofmem.d' -I/root/openbios/openbios-1.1/include
> > -I/root/openbios/openbios-1.1/kernel/include -I./target/include -c -o
> > target/arch/ppc/qemu/ofmem.o /root/openbios/openbios-1.1/arch/ppc/qemu/ofmem.c
> > /tmp/ccznzzOd.s: Assembler messages:
> > /tmp/ccznzzOd.s:551: Error: missing operand
> > rules.mak:309: recipe for target 'target/arch/ppc/qemu/ofmem.o' failed
> > make[1]: *** [target/arch/ppc/qemu/ofmem.o] Error 1
> > make[1]: *** Waiting for unfinished jobs....
> > make[1]: Leaving directory '/root/openbios/openbios-1.1/obj-ppc'
> > Makefile:32: recipe for target 'subdir-ppc' failed
> > make: *** [subdir-ppc] Error 2
> > error: Bad exit status from /var/tmp/rpm-tmp.DSB86j (%build)
> >
> > David Howells' commented in the bug with a suggested fix... but I don't even
> > have a setup to test openbios so I'd prefer if someone else cooks up the patch :)
>
> My understanding is that the earliest CPU we need to be supporting for
> PPC is the 750 (which should be POWER7 series) although there was
> interest in using OpenBIOS for PReP which I believe is a 604?

The Power7 chip is different from the PowerPC 750 (G3). The PowerPC is more like a subset of
the Power processors.

[Laurent Vivier]

Le 21/11/2015 13:46, Mark Cave-Ayland a écrit :
> On 21/11/15 02:03, Cole Robinson wrote:
> > Hi all,
> >
> > openbios fails to build with gcc 5.2 cross compilers. This is using fedora 23
> > packages. There's a bug here with complete info:
> >
> > https://bugzilla.redhat.com/show_bug.cgi?id=1282890
> >
> > The error is:
> >
> > powerpc64-linux-gnu-gcc $EXTRACFLAGS -m32 -msoft-float -fno-builtin-bcopy
> > -fno-builtin-log2 -Os -g -DNATIVE_BITWIDTH_EQUALS_HOST_BITWIDTH
> > -USWAP_ENDIANNESS -Wall -Wredundant-decls -Wshadow -Wpointer-arith
> > -Wstrict-prototypes -Wmissing-declarations -Wundef -Wendif-labels
> > -Wstrict-aliasing -Wwrite-strings -Wmissing-prototypes -Wnested-externs
> > -Werror -MMD -MP -MT target/arch/ppc/qemu/ofmem.o -MF
> > 'target/arch/ppc/qemu/ofmem.d' -I/root/openbios/openbios-1.1/include
> > -I/root/openbios/openbios-1.1/kernel/include -I./target/include -c -o
> > target/arch/ppc/qemu/ofmem.o /root/openbios/openbios-1.1/arch/ppc/qemu/ofmem.c
> > /tmp/ccznzzOd.s: Assembler messages:
> > /tmp/ccznzzOd.s:551: Error: missing operand
> > rules.mak:309: recipe for target 'target/arch/ppc/qemu/ofmem.o' failed
> > make[1]: *** [target/arch/ppc/qemu/ofmem.o] Error 1
> > make[1]: *** Waiting for unfinished jobs....
> > make[1]: Leaving directory '/root/openbios/openbios-1.1/obj-ppc'
> > Makefile:32: recipe for target 'subdir-ppc' failed
> > make: *** [subdir-ppc] Error 2
> > error: Bad exit status from /var/tmp/rpm-tmp.DSB86j (%build)
> >
> > David Howells' commented in the bug with a suggested fix... but I don't even
> > have a setup to test openbios so I'd prefer if someone else cooks up the patch :)
>
> My understanding is that the earliest CPU we need to be supporting for
> PPC is the 750 (which should be POWER7 series) although there was

I think 750 (G3) is POWER2, 970 (G5) is POWER4
> interest in using OpenBIOS for PReP which I believe is a 604?
>
> Hervé/Laurent in particular - any further thoughts on this?

by default gcc-5.1 produces POWER4 assembler (".machine power4").

If we target 750, we should use "-mcpu=G3". it generates a ".machine
ppc", whereas "-mcpu=G5" generates ".machine power4".

I'm going to reproduce the problem and propose a fix.

Laurent