barebox compilation with gcc 4.5.2 and ptxdist

[Sascha Hauer]

On Wed, Jul 27, 2011 at 11:50:12AM +0200, Andre Naujoks wrote:
> Am 27.07.2011 08:40, schrieb Andre Naujoks:
> > Am 26.07.2011 16:20, schrieb Marc Kleine-Budde:
> >> On 07/26/2011 03:56 PM, Andre Naujoks wrote:
> >>> Hello.
> >>>
> >>> We are currently trying to compile a barebox with the git version of
> >>> ptxdist and the git version of the OSELAS generic Toolchain for powerpc.
> >>>
> >>> Also the current 2011.07.0 release of barebox.
> >>>
> >>> We are having some problems during the build, which I think are a result
> >>> of some changes in gcc's optimizations (since 4.4.something). GCC uses
> >>> some functions on the ppc platform to optimze the size of the resulting
> >>> binary, which are only present in the libgcc.a.
> >>>
> >>> The compile stage works fine up tp the last linker step:
> >>>
> >>>   CC      arch/ppc/lib/time.o
> >>>   AS      arch/ppc/lib/misc.o
> >>>   CC      arch/ppc/lib/ppclinux.o
> >>>   CC      arch/ppc/lib/board_data.o
> >>>   LD      arch/ppc/lib/built-in.o
> >>>   LD      barebox
> >>> common/built-in.o: In function `mapset':
> >>> hush.c:(.text.mapset+0x44): undefined reference to `_restgpr_30_x'
> >>> common/built-in.o: In function `syntax_err':
> >>> hush.c:(.text.syntax_err+0x34): undefined reference to `_restgpr_30_x'
> >>> common/built-in.o: In function `done_command':
> >>> hush.c:(.text.done_command+0x94): undefined reference to `_restgpr_29_x'
> >>> common/built-in.o: In function `done_pipe':
> >>> hush.c:(.text.done_pipe+0x5c): undefined reference to `_restgpr_29_x'
> >>> common/built-in.o: In function `is_assignment':
> >>> hush.c:(.text.is_assignment+0x8c): undefined reference to `_restgpr_27_x'
> >>> common/built-in.o: In function `b_addchr':
> >>> hush.c:(.text.b_addchr+0x8c): undefined reference to `_restgpr_28_x'
> >>> common/built-in.o: In function `b_addqchr':
> >>> hush.c:(.text.b_addqchr+0x78): undefined reference to `_restgpr_29_x'
> >>> ...
> >>>
> >>>
> >>> This goes on for a few pages.
> >>>
> >>> As far as I can see, the possibilities I have here, is to either
> >>> integrate the missing functions out of the gcc sources into barebox, or
> >>> make barebox link with libgcc, which seems surprisingly difficult, due
> >>> to the unfamiliar (to me) build process. A simple LDFLAGS_barebox+=-l..
> >>> -L.. did not help here.
> >>>
> >>> Am I right with this assumption, or am I missing something else here?
> >>
> >> We don't want to link barebox against libgcc, that's bad style. I
> >> suggest to port arch/powerpc/lib/crtsavres.S from the linux kernel to
> >> barebox.
> > 
> > Thanks. I will give this a shot and see how far I get. If it works I
> > will come back with a patch.
> 
> Hi.
> 
> With a little help from a collegue, we came up with the patches in the
> followong mails. Basically the kernel files without the 64 bit parts.
> 
> The second patch was another part of libgcc, which seemed to fit best in
> the misc.S file, which was already present.

Applied to -master.

Thanks
 Sascha

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