From nobody Mon Feb 9 07:06:28 2026 Received: from todd.t-8ch.de (todd.t-8ch.de [159.69.126.157]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C2A1F315D30; Mon, 12 Jan 2026 06:44:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.69.126.157 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768200245; cv=none; b=AJssOMRMxSK8tEMIuqYu9QIdh96mX9aZMNmaeR/3zI1Sm7v5sx9ZMgDszjuHp/JEUPHgANWaIo0jrs7pXBDTca+KZNS5ADuQ7wx09Plii+W/O5C6nB+VMlEG5ZxWTxTXFGrPpgNZIjO9StySSvaUN3cPU0c8FD3SseUrz4ZrpWg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768200245; c=relaxed/simple; bh=E6o6SdP51AFFLb1ppQSdkahvWHsXfMXww8e/aPSyd94=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=ZWjp70Wd/lRFpfN6o7gQ7Za7+L31FRT32smtZz8fm+kz7h+vfe5c8iearBikNXL9tFKHW+WytYhuYa2RsrPDu3yFe/7tmBKBdPdq9mUq/IVSkRltPmoZcgRiJ9VPdesx4Y7liEnAyUR7qK4Kk2FpWKYJNJ3NC0smU8VJpolm6SY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net; spf=pass smtp.mailfrom=weissschuh.net; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b=A69xnhlF; arc=none smtp.client-ip=159.69.126.157 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b="A69xnhlF" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=weissschuh.net; s=mail; t=1768200234; bh=E6o6SdP51AFFLb1ppQSdkahvWHsXfMXww8e/aPSyd94=; h=From:Date:Subject:To:Cc:From; b=A69xnhlFWHcyE+Zk8p4a9Od3+9N0XZKOytnqXFtEIczT1G00bnjykMOc4mhroGQSx 38W12uqwjT6/F5Y4O3W4T35zDisNeJtsWxEKBHoAFg5kIPtR7xW2tqUib/VvQD1l5m cuXEAeR1b02hkHfPMDn2uQYJShQEOoK42VRWBoPw= From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= Date: Mon, 12 Jan 2026 07:43:52 +0100 Subject: [PATCH] kbuild: Reject unexpected values for LLVM= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260112-kbuild-llvm-arg-v1-1-8e9bbdae996f@weissschuh.net> X-B4-Tracking: v=1; b=H4sIAAAAAAAC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDIzMDQ0ND3eyk0sycFN2cnLJc3cSidN1kc2MTs0STNKMk40QloK6CotS0zAq widGxtbUAcCaO7mEAAAA= X-Change-ID: 20260111-kbuild-llvm-arg-c7346a4f2b3a To: Nathan Chancellor , Nicolas Schier , Nick Desaulniers , Bill Wendling , Justin Stitt Cc: linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1768200234; l=1123; i=linux@weissschuh.net; s=20221212; h=from:subject:message-id; bh=E6o6SdP51AFFLb1ppQSdkahvWHsXfMXww8e/aPSyd94=; b=KWmaKuyzWxEUYt9keqXzS09/mO73ym+aK1579eE771u2P40K2QyxALwbaXHKkNdZjT2mhH4fP 1z6YndeskRqCg11e558LpGrUVF0DTCajYfFfX6xkSCyEp2QR0Xr49qZ X-Developer-Key: i=linux@weissschuh.net; a=ed25519; pk=KcycQgFPX2wGR5azS7RhpBqedglOZVgRPfdFSPB1LNw= The LLVM argument is documented to accept one of three forms: * a literal '1' to use the default 'clang', * a toolchain prefix path, ending in a trailing '/', * a version suffix. All other values are silently treated as '1'. If for example the user accidentally forgets the trailing '/' of a toolchain prefix, kbuild will unexpectedly and silently fall back to the system toolchain. Instead report an error if the user specified an invalid value for LLVM. Signed-off-by: Thomas Wei=C3=9Fschuh --- Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Makefile b/Makefile index e404e4767944..2a085a1b6875 100644 --- a/Makefile +++ b/Makefile @@ -447,6 +447,8 @@ ifneq ($(filter %/,$(LLVM)),) LLVM_PREFIX :=3D $(LLVM) else ifneq ($(filter -%,$(LLVM)),) LLVM_SUFFIX :=3D $(LLVM) +else ifneq ($(LLVM),1) +$(error Invalid value for LLVM=3D) endif =20 HOSTCC =3D $(LLVM_PREFIX)clang$(LLVM_SUFFIX) --- base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8 change-id: 20260111-kbuild-llvm-arg-c7346a4f2b3a Best regards, --=20 Thomas Wei=C3=9Fschuh