Re: barebox compilation with gcc 4.5.2 and ptxdist

[Marc Kleine-Budde <mkl@pengutronix.de>]

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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.

cheers, Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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