[PATCH v2 3/4] kbuild: add real-prereqs shorthand for $(filter-out FORCE,$^)

[Rob Herring]

On Thu, Jan 17, 2019 at 07:02:43PM +0900, Masahiro Yamada wrote:
> In Kbuild, if_changed and friends must have FORCE as a prerequisite.
> 
> Hence, $(filter-out FORCE,$^) or $(filter-out $(PHONY),$^) is a common
> pattern to get the names of all the prerequisites except phony targets.
> 
> Add real-prereqs as a shorthand.
> 
> Note:
> We cannot replace $(filter %.o,$^) in cmd_link_multi-m because $^ may
> include auto-generated dependencies from the .*.cmd file when a single
> object module is changed into a multi object module. Refer to commit
> 69ea912fda74 ("kbuild: remove unneeded link_multi_deps"). I added some
> comment to avoid accidental breakage.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
> ---
> 
> The patch context depends on some other ones.
> Please use 'git am -C1' if you want to test this
> on Linus' tree.
> 
> 
> Changes in v2:
>   - clean up arch/s390/boot/Makefile as well
> 
>  Documentation/devicetree/bindings/Makefile |  2 +-

Acked-by: Rob Herring <robh at kernel.org>

>  arch/mips/boot/Makefile                    |  2 +-
>  arch/powerpc/boot/Makefile                 |  2 +-
>  arch/s390/boot/Makefile                    |  2 +-
>  arch/x86/realmode/rm/Makefile              |  3 +--
>  scripts/Kbuild.include                     |  4 ++++
>  scripts/Makefile.build                     |  9 ++++++---
>  scripts/Makefile.lib                       | 18 +++++++++---------
>  scripts/Makefile.modpost                   |  2 +-
>  9 files changed, 25 insertions(+), 19 deletions(-)