[PATCH v2 2/2] kbuild: Bump the build system to 5.1

[Ilias Apalodimas]

Hi Fabio


On Thu, 10 Jul 2025 at 17:16, Fabio Estevam <festevam at gmail.com> wrote:
>
> Hi Ilias,
>
> On Fri, Jun 27, 2025 at 3:57 PM Ilias Apalodimas
> <ilias.apalodimas at linaro.org> wrote:
> >
> > Our last sync with the kernel was 5.1. Even that was a partial one
> > as some patches from 4.x kernels were already missing making the
> > transition to a modern kbuild infeasible.
> >
> > We are so out of sync now, that tracking the patches and backporting
> > them one by one makes little sense and it's going to take ages.
> >
> > This is an attempt to sync up Makefile[.lib/.kbuild].
> > Unfortunately due to sheer amount of patches this is not easy to review,
> > but that's what we decided during a community call.
> >
> > One of the biggest changes is get rid of partial linking entirely and
> > build .a archives isntead of .o.
> > We diaviate from the kernel on that. Instead of calling a custom script
> > to create the archive symbol table, we call ar with rcTP (isntead of
> > rcSTP) since we want a resulting archive that's sauble with the linker.
> >
> > The only affected platforms are PPC ones. Unfortunately I don't have any
> > of them around to test, but the objdump of the resulting files --
> > arch/powerpc/lib/built-in.[oa] looks identical.
> >
> > Signed-off-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
>
> This commit breaks the mx6sabresd_defconfig build on my Ubuntu 2022.04 machine:
>
> $ make mx6sabresd_defconfig
>   HOSTCC  scripts/basic/fixdep
>   HOSTCC  scripts/kconfig/conf.o
>   YACC    scripts/kconfig/zconf.tab.c
>   LEX     scripts/kconfig/zconf.lex.c
>   HOSTCC  scripts/kconfig/zconf.tab.o
>   HOSTLD  scripts/kconfig/conf
> #
> # configuration written to .config
> #
> $ make
> scripts/kconfig/conf  --syncconfig Kconfig
>   UPD     include/config.h
>   CFG     u-boot.cfg
>   GEN     include/autoconf.mk
>   GEN     include/autoconf.mk.dep
>   CFG     spl/u-boot.cfg
>   GEN     spl/include/autoconf.mk
> make: *** arch/arm/mach-imx/: Is a directory.  Stop.

Thanks I'll try to reproduce it later today and let you know. Do you
know if we build this defonconfig in the CI?

Thanks
/Ilias