Re: 2.5.56: undefined reference to `_ebss' from drivers/mtd/maps/uclinux.c

From: Adrian Bunk (bunk@fs.tum.de)
Date: Thu Mar 20 2003 - 09:59:28 EST

On Mon, Jan 13, 2003 at 05:23:21PM +1000, Greg Ungerer wrote:
> Hi Adrian,
>
> Adrian Bunk wrote:
> >trying to compile 2.5.56 with CONFIG_MTD_UCLINUX fails on i386 with
> > undefined reference to `_ebss'
> >at the final linking.
> >
> >It seems _ebss is only defined on the architectures m68knommu and v850?
>
> Hmm, currently that is correct. There doesn't appear to be a
> "standard" symbol name applied to the immediate end of the bss
> section. Different architectures are using different names:
>
> _ebss -- m68knommu, v850
> __bss_stop -- i386, alpha, ppc, s390
> __bss_end -- x86_64
> _end -- mips, parisc, sparc, (actually most have this)
>
> Actually it looks like _end is probably closer, it seems to
> almost always fall strait after the bss, on just about every
> architecture that has it.
>
> Come to think of it _end is probably more appropriate anyway.
> Since that code is trying to find the location of something
> concatenated to the end of the kernel image.

This problem (undefined reference to `_ebss') is still present in
2.5.65.

It might not be a solution for the whole issue, but is it intentionally
that it's possible to enable CONFIG_MTD_UCLINUX on non-uClinux
architectures or should an appropriate dependency be added to the
Kconfig file?

> Regards
> Greg

cu
Adrian 

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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