Re: GCC-4 problems

[Manuel L. <ma...@ro...>]

Mike Frysinger wrote:
> On Saturday 07 July 2007, Manuel Lauss wrote:
>> Paul Mundt wrote:
>>> On Mon, Mar 19, 2007 at 09:27:57AM +0100, Manuel Lauss wrote:
>>>> Also, these exports need to be removed from sh_ksyms.c, they give
>>>> "undefined reference" errors:
>>>> __sdivsi3_i4i __udiv_qrnnd_16 __udivsi3_i4i
>>> Ok, so removing these seems to be have created fallout all over the
>>> place. Apparently it's just your GCC4 that seems to have problems with
>>> these symbols, whereas the other ones really seem to want them. It looks
>> Oh, sorry, that wasn't my intention at all.
>>
>>> like we're going to have to narrow it down to the exact release in which
>>> they vanished (I would guess 4.1.2, since 4.1.1 still wants them).
>>>
>>> akpm also suggests he has a 3.4.5 toolchain that needs these, which is
>>> also very unusual. Do you have a tarball of your compiler somewhere so
>>> it's easier to debug?
>> Prompted by your mail I reverted commit
>> 9c5b406b9a857a67caf778f096bfc7f4e6b0401a and GCC builds the kernel
>> just fine now; the only difference is that I've upgraded from 4.1.1 to
>> 4.1.2 in the meantime.

That was bogus; I was compiling the wrong local tree again.

>> Compiler is made with Gentoo's "crossdev" tool, which AFAICT is vanilla
>> 4.1.2 with a few bugfix patches applied (+ PR29599 fix for me)
>> (see http://gentoo.inode.at/distfiles/gcc-4.1.2-patches-1.0.1.tar.bz2)
>>
>> I can rebuild gcc-4.1.1 which failed for me if you like.
> 
> ruh roh ... someone said Gentoo ;)
> 
> default gcc-4.x in Gentoo enables multilib for SuperH targets akin to gcc-3.x 
> (since vanilla gcc-4.x does not include nofpu support by default)
> 
> to doubly verify, you can emerge gcc with USE=vanilla ... that'll disable the 
> Gentoo patchset ...

Did that, it still complains:
arch/sh/kernel/built-in.o:(__ksymtab+0xa8): undefined reference to `__sdivsi3_i4i'
arch/sh/kernel/built-in.o:(__ksymtab+0xb0): undefined reference to `__udiv_qrnnd_16'
arch/sh/kernel/built-in.o:(__ksymtab+0xb8): undefined reference to `__udivsi3_i4i'

...and the "-m4-nofpu" option is unsupported again ;-)

I'm going to try with vanilla binutils next...

Thanks,
	Manuel Lauss