barebox compilation with gcc 4.5.2 and ptxdist

[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.

> 
> cheers, Marc
> 

Regards
  Andre