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

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Message-Id: <20250620103705.10208-3-w@1wt.eu>
Date: Fri, 20 Jun 2025 12:37:04 +0200
From: Willy Tarreau <w@....eu>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: linux-kernel@...r.kernel.org, Masahiro Yamada <masahiroy@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Willy Tarreau <w@....eu>
Subject: [RFC PATCH 2/3] tools/nolibc: add a new target "headers_all_archs" to loop over all archs

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