[PATCH v3] Add make feature support for SoCFPGA Handoff

[Tom Rini]

On Tue, Nov 04, 2025 at 07:10:54AM +0800, Sune Brian wrote:
> > Because ".config" isn't valid, you need to have $(objdir)/.config be
> > checked, and in turn that has to depend on the appropriate target (we
> > have some stage that says that we are configured, I forget which).
> 
> ```
> make clean && make mrproper
> 
> make
> ***
> *** Configuration file ".config" not found!
> ***
> *** Please run some configurator (e.g. "make oldconfig" or
> *** "make menuconfig" or "make xconfig").
> ***
> make: *** No rule to make target '.config', needed by
> 'include/config/auto.conf'.  Stop.
> ```
> 
> Still not getting this, sorry a bit.

You need to do some builds with "make O=/tmp/somedir". But also, I'm
trying to make sure we avoid race conditions and that we don't try this
logic until after the step where we know we have configured the system.

> > > > spin with "make O=/tmp/somedir". It also looks like it's going to impact
> > > > every board, and either fail or add some build time? Make sure both say
> > > > "sandbox" and "qemu_arm" both build at least, if not a full CI run.
> > >
> > > For build time -> There could be 4 line of code to check.
> >
> > I do forget off-hand which methods of doing "something" in a Makefile
> > are cheap and which result in firing off a subshell. But for a handy
> > feature for one SoC I want to make sure we don't slow down say the world
> > 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.
> 
> If config.mk can also do this job why not just move it.

Yes, I'm saying move this logic to that file where I think it should be
workable, still.

> 
> Brian

-- 
Tom
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