linux-kernel - [PATCH 0/2] kbuild: userprogs: two fixes for LLVM=1

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Message-Id: <20250213-kbuild-userprog-fixes-v1-0-f255fb477d98@linutronix.de>
Date: Thu, 13 Feb 2025 15:55:16 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Masahiro Yamada <masahiroy@...nel.org>, 
 Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, 
 Nick Desaulniers <ndesaulniers@...gle.com>, 
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
 Sam Ravnborg <sam@...nborg.org>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
 llvm@...ts.linux.dev, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>, 
 stable@...r.kernel.org
Subject: [PATCH 0/2] kbuild: userprogs: two fixes for LLVM=1

Fix two issues when cross-building userprogs with clang.

Reproducer, using nolibc to avoid libc requirements for cross building:

$ tail -2 init/Makefile
userprogs-always-y += test-llvm
test-llvm-userccflags += -nostdlib -nolibc -static -isystem usr/ -include $(srctree)/tools/include/nolibc/nolibc.h

$ cat init/test-llvm.c
int main(void)
{
	return 0;
}

$ make ARCH=arm64 LLVM=1 allnoconfig headers_install init/

Validate that init/test-llvm builds and has the correct binary format.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
Thomas Weißschuh (2):
      kbuild: userprogs: fix bitsize and target detection on clang
      kbuild: userprogs: use lld to link through clang

 Makefile | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
base-commit: 2014c95afecee3e76ca4a56956a936e23283f05b
change-id: 20250213-kbuild-userprog-fixes-4f07b62ae818

Best regards,
-- 
Thomas Weißschuh <thomas.weissschuh@...utronix.de>