linux-kernel - Re: [PATCH 1/5] kbuild: remove unnecessary $(subst $(obj)/,,...) in modname-multi

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Date:   Thu, 8 Mar 2018 19:24:10 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Cc:     Sam Ravnborg <sam@...nborg.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Cao jin <caoj.fnst@...fujitsu.com>,
        Govind Singh <govinds@...eaurora.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] kbuild: remove unnecessary $(subst $(obj)/,,...) in modname-multi

2018-03-08 10:04 GMT+09:00 Masahiro Yamada <yamada.masahiro@...ionext.com>:
> In the context ...
>
>     $(obj)/%.s: $(src)/%.c FORCE
>             $(call if_changed_dep,cc_s_c)
>
>     $(obj)/%.i: $(src)/%.c FORCE
>             $(call if_changed_dep,cpp_i_c)
>
>     $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
>             $(call cmd,force_checksrc)
>             $(call if_changed_rule,cc_o_c)
>
>     $(obj)/%.lst: $(src)/%.c FORCE
>             $(call if_changed_dep,cc_lst_c)
>
> '$*' returns the stem of the target (the part of '%'), so $(obj)/ has
> already been ripped off.
>
> $(subst $(obj)/,,$*.o) is the same as $(*.o)


Log fix-up:

 ... is the same as $*.o





> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
>
>  scripts/Makefile.lib | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 5589bae..a7e315f 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -175,7 +175,7 @@ dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
>
>  # Finds the multi-part object the current object will be linked into
>  modname-multi = $(sort $(foreach m,$(multi-used),\
> -               $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
> +               $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
>
>  # Useful for describing the dependency of composite objects
>  # Usage:
> --
> 2.7.4
>
> --
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-- 
Best Regards
Masahiro Yamada