Re: undefined reference to `__multi3' when building with gcc 7.x

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Hello,

On Fri, 18 Aug 2017 00:19:31 +0200, Ralf Baechle wrote:

> > Despite the theory being simple, wiring this up will take time as it also
> > involves getting the costing calculations updated.
> > 
> > Please can you submit it as a GCC bug?  
> 
> Will do.
> 
> > As a workaround you may want to include a version of __multi3 in the kernel
> > until it is resolved.  
> 
> Yes, working on that.  This has been made harder by the fact that the
> implementation of __umulti3 is well hidden in the source :)  I now have
> functioning implementation of __multi3 but it's still too ugly to be
> committed to the kernel.
> 
> And while I agree it should be fixed in GCC at the same time the
> generated code while convoluted and unnecessarily slow appears to be
> correct so I think we should support this by adding a suitable __umulti3
> to the kernel code as you suggest.

Has there been any progress on solving this issue ? Either on the GCC
side or the kernel side ?

Thanks a lot!

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com