From nobody Tue Apr 7 04:18:36 2026 Received: from mail-dl1-f73.google.com (mail-dl1-f73.google.com [74.125.82.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 057BE364E85 for ; Mon, 16 Mar 2026 21:29:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773696587; cv=none; b=RKkvVYXao1wsyVJ3H5u+PQgXZipJutRrExE3iyc4Qlcz0Psirlz9NIt2YWdelFLAjLStA06rzKNjPOKMuVmdR8RRfLJiz5KFEWX0KDbfA4vVm4NnKtWg4IML2qBTrIdFLijLJJDrhFzzLXOB18vABe+HzOpL6fmCReddBqeN45A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773696587; c=relaxed/simple; bh=tGb1M0tRkfKEH3KWUQR/MxlPIzxmfHf/7F+6VNuez4Q=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=Os39AEWu0HmJJRtRYuH53vvTZ/08bRUzPS4HXT2u5CG/f8l4dxE83+yqe35DG9VV7Ce05hdxc5xJk+V0tF4B2mqfXqk/meuR4ZEGouDoS5ZYDX/uZJ7RRxqyuzst0nejBi2kIUroYyEh9kxf/y3q9f2y3wbCFo5PEK1HABeVz4c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--xur.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=EO/RiJtr; arc=none smtp.client-ip=74.125.82.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--xur.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="EO/RiJtr" Received: by mail-dl1-f73.google.com with SMTP id a92af1059eb24-127337c8e52so96099450c88.1 for ; Mon, 16 Mar 2026 14:29:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1773696585; x=1774301385; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=mA9wHqPkq9Vq1JF9PRYSj3uN1F4IR3mUOXVfm9WMuek=; b=EO/RiJtrfqe3T9pO2d1mshHlDE+MKv6Y8RglrX3ERWWfi01DaKgPotPQPa7S2okGzT R/XtxyxFNEULg6cDh3QdzC6f9TQaeN3CnIauUATM1KX5EBbXv6LBoTJ7uign2Oj1Kxq6 PnKefC1I2rXKvWPESkrIz2nrYBuZ4aQgWR0kZWsFEdIc/ft+IodOOq0a2vTCTqnXhAS3 VR+Lg8wcys7g6F830ocIJx8iQThasokMIaB/WKkjsiOo3a3KL6mlHTNu/tE6+mywqUFF NxkR6s2MgbrNfTKG5qSiRpsV8pWYVZGTzhYY6Qec2hPm2FDXPMECXbYZudTUduWK4aDs xobg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1773696585; x=1774301385; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=mA9wHqPkq9Vq1JF9PRYSj3uN1F4IR3mUOXVfm9WMuek=; b=sYYsR4UEmTobxCPuIPJJfkqKFiNE3+ztxryY1X2tjNoaFjyl8+3NRsWf9FYWiJHXMh CegDV+hEyMzNZo06x2R5n3Oi3GC4y/Ct5bf1GMhMSmsza2bPeIfCubRy5gX8O/aV+Jb9 El1DzfQekzGqq7Yl7Ay0XC4Ie9F+faifsJ12AbVMCoShQrQ9uqu0lOq/F2OYRZOkX/El Fokp4KTK2C7gaYAuMPKvUTAjCm3WUDlloD16XSWeBlTeGaFV2tvTKFcRpah+z9rt9J4m ZcTHJFoirQWYls3hd9JjbiSLEOoDvKy22pnRBvBMNeA5iSWRWc8FwM51rBJ6X8rYhrhd EPVA== X-Gm-Message-State: AOJu0YwdQHW0H6i8/bwzwWn4B1kYMAvVO5bxUzn29xwy+f9ES09fM+LZ Gr+jpPAewGqcwGkY6Kgil+yPvN84532F8kzkEHRYQY8EZmPhvB1B1SODZpqg3m6D/HWXZw== X-Received: from dleb10-n2.prod.google.com ([2002:a05:701b:424a:20b0:128:ee08:8c14]) (user=xur job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7022:618f:b0:11b:f056:a1b3 with SMTP id a92af1059eb24-128f3d3f175mr8012386c88.11.1773696584848; Mon, 16 Mar 2026 14:29:44 -0700 (PDT) Date: Mon, 16 Mar 2026 21:29:29 +0000 In-Reply-To: <20260316212930.120438-1-xur@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260316212930.120438-1-xur@google.com> X-Mailer: git-send-email 2.53.0.851.ga537e3e6e9-goog Message-ID: <20260316212930.120438-2-xur@google.com> Subject: [PATCH v6 1/2] kbuild: move vmlinux.a build rule to scripts/Makefile.vmlinux_a From: xur@google.com To: Masahiro Yamada , Nathan Chancellor , Nicolas Schier , Nick Desaulniers , Bill Wendling , Justin Stitt , Miguel Ojeda , Thomas Gleixner , Alice Ryhl , Sami Tolvanen , "Mike Rapoport (Microsoft)" , Rafael Aquini , Michael Ellerman , Stafford Horne , Christophe Leroy , Piotr Gorski , Rong Xu , Venkat Rao Bagalkote , Miguel Ojeda , Teresa Johnson Cc: linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, llvm@lists.linux.dev Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Rong Xu From: Masahiro Yamada Move the build rule for vmlinux.a to a separate file in preparation for supporting distributed builds with Clang ThinLTO. Signed-off-by: Masahiro Yamada Tested-by: Rong Xu Signed-off-by: Rong Xu Tested-by: Piotr Gorski Reviewed-by: Nathan Chancellor Tested-by: Nathan Chancellor --- Makefile | 16 +++++-------- scripts/Makefile.vmlinux_a | 46 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 52 insertions(+), 10 deletions(-) create mode 100644 scripts/Makefile.vmlinux_a diff --git a/Makefile b/Makefile index c9b7bee102e8..ba5eee68d5d2 100644 --- a/Makefile +++ b/Makefile @@ -1255,7 +1255,7 @@ export ARCH_DRIVERS :=3D $(drivers-y) $(drivers-m) KBUILD_VMLINUX_OBJS :=3D built-in.a $(patsubst %/, %/lib.a, $(filter %/, $= (libs-y))) KBUILD_VMLINUX_LIBS :=3D $(filter-out %/, $(libs-y)) =20 -export KBUILD_VMLINUX_LIBS +export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS export KBUILD_LDS :=3D arch/$(SRCARCH)/kernel/vmlinux.lds =20 ifdef CONFIG_TRIM_UNUSED_KSYMS @@ -1264,16 +1264,12 @@ ifdef CONFIG_TRIM_UNUSED_KSYMS KBUILD_MODULES :=3D y endif =20 -# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <=3D 14 -quiet_cmd_ar_vmlinux.a =3D AR $@ - cmd_ar_vmlinux.a =3D \ - rm -f $@; \ - $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ - $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(src= tree)/scripts/head-object-list.txt) +PHONY +=3D vmlinux_a +vmlinux_a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_a =20 -targets +=3D vmlinux.a -vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE - $(call if_changed,ar_vmlinux.a) +vmlinux.a: vmlinux_a + @: =20 PHONY +=3D vmlinux_o vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) diff --git a/scripts/Makefile.vmlinux_a b/scripts/Makefile.vmlinux_a new file mode 100644 index 000000000000..650d44330d1f --- /dev/null +++ b/scripts/Makefile.vmlinux_a @@ -0,0 +1,46 @@ +# SPDX-License-Identifier: GPL-2.0-only + +PHONY :=3D __default +__default: vmlinux.a + +include include/config/auto.conf +include $(srctree)/scripts/Kbuild.include +include $(srctree)/scripts/Makefile.lib + +# Link of built-in-fixup.a +# ------------------------------------------------------------------------= --- + +# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <=3D 14 +quiet_cmd_ar_builtin_fixup =3D AR $@ + cmd_ar_builtin_fixup =3D \ + rm -f $@; \ + $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ + $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(src= tree)/scripts/head-object-list.txt) + +targets +=3D built-in-fixup.a +built-in-fixup.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE + $(call if_changed,ar_builtin_fixup) + +# vmlinux.a +# ------------------------------------------------------------------------= --- + +targets +=3D vmlinux.a +vmlinux.a: built-in-fixup.a FORCE + $(call if_changed,copy) + +# Add FORCE to the prerequisites of a target to force it to be always rebu= ilt. +# ------------------------------------------------------------------------= --- + +PHONY +=3D FORCE +FORCE: + +# Read all saved command lines and dependencies for the $(targets) we +# may be building above, using $(if_changed{,_dep}). As an +# optimization, we don't need to read them if the target does not +# exist, we will rebuild anyway in that case. + +existing-targets :=3D $(wildcard $(sort $(targets))) + +-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) + +.PHONY: $(PHONY) --=20 2.53.0.851.ga537e3e6e9-goog