linux-kernel - Re: [PATCH] kbuild: move .SECONDARY special target to Kbuild.include

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Date:   Sat, 8 Dec 2018 15:54:11 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Cc:     Jason@...c4.com, "David S. Miller" <davem@...emloft.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-crypto@...r.kernel.org, Will Deacon <will.deacon@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Catalin Marinas <catalin.marinas@....com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] kbuild: move .SECONDARY special target to Kbuild.include

On Sat, Dec 1, 2018 at 9:29 AM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
>
> In commit 54a702f70589 ("kbuild: mark $(targets) as .SECONDARY and
> remove .PRECIOUS markers"), I missed one important feature of the
> .SECONDARY target:
>
>   .SECONDARY with no prerequisites causes all targets to be treated
>    as secondary.
>
> Kbuild's policy is, "Do not delete any intermediate files."
> So, just move it to scripts/Kbuild.include, with no prerequisites.
>
> Note:
> If an intermediate file is generated by $(call if_changed,...), you
> still need to add it to "targets" so its .*.cmd file is included.
>
> The arm/arm64 crypto files are generated by $(call cmd,shipped),
> so they do not need to be added to "targets", but need to be added
> to "clean-files" so "make clean" can properly clean them away.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---


Applied to linux-kbuild.



>  arch/arm/crypto/Makefile   | 2 +-
>  arch/arm64/crypto/Makefile | 2 +-
>  scripts/Kbuild.include     | 3 +++
>  scripts/Makefile.build     | 4 ----
>  4 files changed, 5 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/crypto/Makefile b/arch/arm/crypto/Makefile
> index bd5bcee..89f88ab 100644
> --- a/arch/arm/crypto/Makefile
> +++ b/arch/arm/crypto/Makefile
> @@ -65,4 +65,4 @@ $(src)/sha512-core.S_shipped: $(src)/sha512-armv4.pl
>         $(call cmd,perl)
>  endif
>
> -targets += sha256-core.S sha512-core.S
> +clean-files += sha256-core.S sha512-core.S
> diff --git a/arch/arm64/crypto/Makefile b/arch/arm64/crypto/Makefile
> index f476fed..860d931 100644
> --- a/arch/arm64/crypto/Makefile
> +++ b/arch/arm64/crypto/Makefile
> @@ -75,4 +75,4 @@ $(src)/sha512-core.S_shipped: $(src)/sha512-armv8.pl
>         $(call cmd,perlasm)
>  endif
>
> -targets += sha256-core.S sha512-core.S
> +clean-files += sha256-core.S sha512-core.S
> diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
> index bb01555..0454916 100644
> --- a/scripts/Kbuild.include
> +++ b/scripts/Kbuild.include
> @@ -393,3 +393,6 @@ endef
>
>  # delete partially updated (i.e. corrupted) files on error
>  .DELETE_ON_ERROR:
> +
> +# do not delete intermediate files automatically
> +.SECONDARY:
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index a8e7ba9..604096a 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -546,8 +546,4 @@ $(shell mkdir -p $(obj-dirs))
>  endif
>  endif
>
> -# Some files contained in $(targets) are intermediate artifacts.
> -# We never want them to be removed automatically.
> -.SECONDARY: $(targets)
> -
>  .PHONY: $(PHONY)
> --
> 2.7.4
>


-- 
Best Regards
Masahiro Yamada