linux-kernel - Re: [PATCH 1/5] kbuild: treat an object as multi-used when $(foo-) is set

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Date:   Mon, 19 Aug 2019 23:53:24 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Cc:     Jani Nikula <jani.nikula@...el.com>,
        intel-gfx@...ts.freedesktop.org, Sam Ravnborg <sam@...nborg.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] kbuild: treat an object as multi-used when $(foo-) is set

On Tue, Aug 6, 2019 at 3:40 PM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
>
> Currently, Kbuild treats an object as multi-used when any of
> $(foo-objs), $(foo-y), $(foo-m) is set. It makes more sense to
> check $(foo-) as well.
>
> In the context of foo-$(CONFIG_FOO_FEATURE1), CONFIG_FOO_FEATURE1
> could be unset.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>

Only this patch applied for now.


> ---
>
>  scripts/Makefile.lib | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 41c50f9461e5..0a540599823e 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -41,9 +41,9 @@ obj-m         := $(filter-out %/, $(obj-m))
>  # Subdirectories we need to descend into
>  subdir-ym      := $(sort $(subdir-y) $(subdir-m))
>
> -# if $(foo-objs), $(foo-y), or $(foo-m) exists, foo.o is a composite object
> -multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
> -multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
> +# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
> +multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))), $(m))))
> +multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))), $(m))))
>  multi-used   := $(multi-used-y) $(multi-used-m)
>
>  # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
> @@ -52,8 +52,8 @@ subdir-obj-y := $(filter %/built-in.a, $(obj-y))
>
>  # Replace multi-part objects by their individual parts,
>  # including built-in.a from subdirectories
> -real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
> -real-obj-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))
> +real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
> +real-obj-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))
>
>  # DTB
>  # If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
> --
> 2.17.1
>


-- 
Best Regards
Masahiro Yamada