linux-kernel - Re: [PATCH 5/5] kbuild: unify no-compiler-targets and no-sync-config-targets

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Message-ID: <20231009164424.GB1153868@dev-arch.thelio-3990X>
Date:   Mon, 9 Oct 2023 09:44:24 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-parisc@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-um@...ts.infradead.org,
        loongarch@...ts.linux.dev, sparclinux@...r.kernel.org,
        x86@...nel.org, Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>
Subject: Re: [PATCH 5/5] kbuild: unify no-compiler-targets and
 no-sync-config-targets

On Mon, Oct 09, 2023 at 09:42:10PM +0900, Masahiro Yamada wrote:
> Now that vdso_install does not depend on any in-tree build artifact,
> it no longer invokes a compiler, making no-compiler-targets the same
> as no-sync-config-targets.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> 
>  Makefile | 13 +------------
>  1 file changed, 1 insertion(+), 12 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index 2170d56630e8..982b1ad33287 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -277,10 +277,6 @@ no-dot-config-targets := $(clean-targets) \
>  			 $(version_h) headers headers_% archheaders archscripts \
>  			 %asm-generic kernelversion %src-pkg dt_binding_check \
>  			 outputmakefile rustavailable rustfmt rustfmtcheck
> -# Installation targets should not require compiler. Unfortunately, vdso_install
> -# is an exception where build artifacts may be updated. This must be fixed.
> -no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
> -			headers_install modules_install modules_sign kernelrelease image_name
>  no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
>  			  image_name
>  single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
> @@ -288,7 +284,6 @@ single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %
>  config-build	:=
>  mixed-build	:=
>  need-config	:= 1
> -need-compiler	:= 1
>  may-sync-config	:= 1
>  single-build	:=
>  
> @@ -298,12 +293,6 @@ ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
>  	endif
>  endif
>  
> -ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
> -	ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
> -		need-compiler :=
> -	endif
> -endif
> -

MIPS and LoongArch seem to have grown a usage of need-compiler in
4fe4a6374c4d ("MIPS: Only fiddle with CHECKFLAGS if `need-compiler'")
and 54c2c9df083f ("LoongArch: Only fiddle with CHECKFLAGS if
`need-compiler'"). With this removal, should those be updated as well?

>  ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
>  	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
>  		may-sync-config :=
> @@ -675,7 +664,7 @@ endif
>  
>  # Include this also for config targets because some architectures need
>  # cc-cross-prefix to determine CROSS_COMPILE.
> -ifdef need-compiler
> +ifdef may-sync-config
>  include $(srctree)/scripts/Makefile.compiler
>  endif
>  
> -- 
> 2.39.2
>