To summarize my understanding of this issue (see below for background):
- powerpcspe is variant of powerpc that lacks certain parts of the powerpc
instruction set, as explained here: http://wiki.debian.org/PowerPCSPEPort
- The FFI plugin has architecture-specific assembler modules that set
up the entry points for FFI calls. The assembly module for powerpc is
platforms/unix/plugins/SqueakFFIPrims/ppc-sysv-asm.S
- The ppc-sysv-asm.S module uses one or more instructions ('lfd', possibly
others) that are not available on the powerpcspe processor, and the the
module cannot be compiled on powerpcspe.
- The solution for the Debian build is to not build the FFI plugin when
compiling for powerpcspe. This is done by passing the --without-SqueakFFIPrims
option to the cmake configure when building on powerpcspe.
- The configuration is done in a file called debian/rules, and the provided
squeak-vm.patch is a patch for that rules file. This file is not part of
the Squeak VM platforms sources and is presumably maintained externally
by the Debian folks.
- The right way to fix the build problem in the platforms sources would be
to modify platforms/unix/plugins/SqueakFFIPrims/config.cmake to disable
the FFI plugin for powerpcspe at configure time. This is probably easy to
do, although I do not have a way to try it myself.
- Extra credit: If someone wanted FFI to work on powerpcspe, the way to make
this happen would be to write a variation of ppc-sysv-asm.S for powerpcspe
and add it to config.cmake.
Dave
On Mon, Nov 19, 2012 at 06:38:10PM +0100, Bert Freudenberg wrote:
>
> Begin forwarded message:
>
> > Resent-From: Roland Stigge <sti...@antcom.de>
> > From: Roland Stigge <sti...@antcom.de>
> > Subject: Bug#693633: squeak-vm: FTBFS on powerpcspe (asm stfd/lfd)
> > Date: 18. November 2012 21:10:04 MEZ
> > Resent-To: debian-bugs-dist@lists.debian.org
> > To: Debian Bug Tracking System <sub...@bugs.debian.org>
> > Resent-Cc: Debian Squeak Team <pkg-squeak-de...@lists.alioth.debian.org>
> > Reply-To: Roland Stigge <sti...@antcom.de>, 693...@bugs.debian.org
> >
> > Package: squeak-vm
> > Version: 1:4.4.7.2357-1.1
> > Severity: wishlist
> > Tags: sid patch
> > User: debian-powerpc...@breakpoint.cc
> > Usertags: powerpcspe
> >
> > Hi,
> >
> > squeak-vm FTBFS on powerpcspe [1] like this:
> >
> > [ 82%] Building ASM object
> > SqueakFFIPrims/CMakeFiles/SqueakFFIPrims.dir/<C2><AB>PKGBUILDDIR<C2><BB>/unix/plugins/SqueakFFIPrims/ppc-sysv-asm.S.o
> > /PKGBUILDDIR/unix/plugins/SqueakFFIPrims/ppc-sysv-asm.S: Assembler messages:
> > /PKGBUILDDIR/unix/plugins/SqueakFFIPrims/ppc-sysv-asm.S:109: Error:
> > Unrecognized opcode: `lfd'
> > [...]
> >
> > There are some asm statements that only work on powerpc but not on
> > powerpcspe.
> >
> > Attaching a patch that fixes it by disabling the SqueakFFIPrims plugin on
> > powerpcspe.
> >
> > Thanks,
> >
> > Roland
> >
> >
> > [1] http://wiki.debian.org/PowerPCSPEPort
> >
> > -- System Information:
> > Debian Release: wheezy/sid
> > APT prefers unstable
> > APT policy: (500, 'unstable'), (1, 'experimental')
> > Architecture: amd64 (x86_64)
> >
> > Kernel: Linux 3.5.0 (SMP w/4 CPU cores)
> > Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8) (ignored:
> > LC_ALL set to en_GB.UTF-8)
> > Shell: /bin/sh linked to /bin/dash
> >
>
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