[PATCH v3] Add make feature support for SoCFPGA Handoff

[Sune Brian]

> > > build of all 1400 configurations. For a maybe useful example, see how
> > > the "checkgcc6" target is handled, and maybe we can move all of this to
> > > live under arch/arm/mach-socfpga/config.mk and so only get invoked at
> > > all there.

Yes this could be an issue, I had cross-check via several AIs feedbacks.
Even if the logic and syntax runs it doesn't mean it is optimized.

But same way in other locations as well.
Will check a bit on this.

Brian