linux-kernel - Re: [RFC PATCH 2/3] tools/nolibc: add a new target "headers_all

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Message-ID: <4c48147d-aebc-4a2c-a60f-eba2e90584ed@t-8ch.de>
Date: Mon, 23 Jun 2025 23:56:29 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Willy Tarreau <w@....eu>
Cc: linux-kernel@...r.kernel.org, Masahiro Yamada <masahiroy@...nel.org>, 
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [RFC PATCH 2/3] tools/nolibc: add a new target
 "headers_all_archs" to loop over all archs

On 2025-06-20 12:37:04+0200, Willy Tarreau wrote:
> This target allows to install the nolibc headers for all supported
> architectures at once, just like it is in the development tree. This
> is a first step to support full multi-architecture support.
> 
> Signed-off-by: Willy Tarreau <w@....eu>
> ---
>  tools/include/nolibc/Makefile | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile
> index 9197c79b267a4..8de6ac5cec425 100644
> --- a/tools/include/nolibc/Makefile
> +++ b/tools/include/nolibc/Makefile
> @@ -23,6 +23,8 @@ else
>  Q=@
>  endif
>  
> +nolibc_supported_archs := aarch64 arm loongarch m68k mips powerpc riscv s390 sparc x86
> +
>  nolibc_arch := $(patsubst arm64,aarch64,$(ARCH))
>  arch_file := arch-$(nolibc_arch).h
>  all_files := \
> @@ -83,6 +85,7 @@ help:
>  	@echo "  all                 call \"headers\""
>  	@echo "  clean               clean the sysroot"
>  	@echo "  headers             prepare a sysroot in \$${OUTPUT}sysroot"
> +	@echo "  headers_all_archs   prepare a multi-arch sysroot in \$${OUTPUT}sysroot"
>  	@echo "  headers_standalone  like \"headers\", and also install kernel headers"
>  	@echo "  help                this help"
>  	@echo ""
> @@ -110,6 +113,13 @@ headers_standalone: headers
>  	$(Q)$(MAKE) -C $(srctree) headers
>  	$(Q)$(MAKE) -C $(srctree) headers_install INSTALL_HDR_PATH=$(OUTPUT)sysroot
>  
> +# installs headers for all archs at once.
> +headers_all_archs:
> +	$(Q)mkdir -p "$(OUTPUT)sysroot"
> +	$(Q)mkdir -p "$(OUTPUT)sysroot/include"
> +	$(Q)cp --parents $(all_files) arch.h "$(OUTPUT)sysroot/include/"
> +	$(Q)cp $(addsuffix .h,$(addprefix arch-,$(nolibc_supported_archs))) "$(OUTPUT)sysroot/include/"

IMO we could always just install all architecture headers.
It's not much code after all.
If it is a problem for a user they can either just delete the
superfluous architectures or do 'mv arch-$foo.h arch.h; rm arch-*.h'.

> +
>  # GCC uses "s390", clang "systemz"
>  CLANG_CROSS_FLAGS := $(subst --target=s390-linux,--target=systemz-linux,$(CLANG_CROSS_FLAGS))
>  
> -- 
> 2.17.5