From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) (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 28CAD2F99BE for ; Mon, 27 Oct 2025 22:09:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.74 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761602961; cv=none; b=CU8F7iBVpZ4SmTgSlwHFf7SVjs6MvIQkyUZCPU1ApJ2WVDOQ4anKIJCqNk7fg5T35xd6ziqFLleZCS2PXegQRpTBMZInhRxo5QxbfqxfNKwoNTQDCTAQqBzckzzHUX5OWXTc6gQkCqOso+Ieu93YHoTY+928jGfI5aByantpjCY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761602961; c=relaxed/simple; bh=yXfJZ9u3Fbjfd2gJx08sRzobL8zpTJ5hQcZOUZCTRdw=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=PAZgbgxHWtkJ3z9Spw2BhZOin9WbaPxPFMO8Zo9LAfvHMU3xUJEntT6olBnoOnZtvd78rOkkLyWLEWERIXOJ20PwZxQmCsmVPiPfiDFa9eLaJ78fqPhRMCc6BZGy7ioOIiFQhzV7P+KQZkfavd4fQvezH/yp8n9/IewuqzBuZZE= 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=Qae6kQ5X; arc=none smtp.client-ip=209.85.216.74 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="Qae6kQ5X" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-34029b3dbfeso154660a91.3 for ; Mon, 27 Oct 2025 15:09:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1761602959; x=1762207759; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=dSGfQMNjri/IzdLNzyd+71NlCYDzISAHz9ggAxICGTk=; b=Qae6kQ5XvSUFsXrXJlpvJ7L/xGUDSCqpqCfTK79SSLUYie0oYiOMfaHOnvaCVIKq8K U4qCj+3+C9zZxX6xvqwgVv1lE3yJsghz68vGKOlPHMGr4V6UAaftb7XktT/EW0chv3eh BmgQi0HZXAUBq30x2fGx4peV7We/EbSMlGXEOHdGvhLz3SDjatmfzkIpkgRXQscuqIs1 bf0+oePL6A4/T9r/yiXNBHx3ED3WB01Xf8FXn6fnLzPRgGzOYV7zBgZBimJUtvtN3eZD +Xqoia6UtIUK+IK/fjVNsAP9f3otHZqgdu9ChlmThknhQ/IhjmVer8JvZxQrAe1NA4yG TNPA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1761602959; x=1762207759; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=dSGfQMNjri/IzdLNzyd+71NlCYDzISAHz9ggAxICGTk=; b=LIOclFM+X93+1Xt7F32jqehTabbgZumBfL97yOB5jHjDOpSoVPr9N/8xxnzYqcHw6J S3RVfZDw/IN5lu1pAZ4JsCBaZiKws79DV8KGwNO0aRT470DnZaeiB9jOL/5U7Uu5Gfd1 f3B1qQq67E4QDXoiGYmJ2IAwo7qNvQV61PAocg+M/RrvidwX7CLcZogiR6W3T3NK0nbe nIOHu5NGkZtJKyUut6WpA+eOrz5UZ7d4+ABp7zq0lKpthgrLeXKeJTDh4d254sXnMnpy 4XlojIoFAwYAwMz54dzWldzNgTXM4VAQ6rZA0HoRj0kYd9vc+V6VlNXxHA6VaKHEMIId zvDw== X-Gm-Message-State: AOJu0YyzYzH5Ion+wPWmrZamWjq66G4FMVqgSq7Mz89hbRYffJLYBQEp rIKBQq52UKp6nae5zkqKiSVsbOrt4tjnBRPl1Ypj5oqHn5vDStixxrulcfaE44fE7Hp4eA== X-Google-Smtp-Source: AGHT+IGS7xK7WB6H01wrhC/DTJJJdKCdhMHqBiqf2jyYVcEgqsh6sEw0yU2tcp1RCB979UO3Psy6Cak= X-Received: from pjboi5.prod.google.com ([2002:a17:90b:3a05:b0:32b:65c6:661a]) (user=xur job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:280c:b0:32b:bac7:5a41 with SMTP id 98e67ed59e1d1-34027c1c55cmr1350654a91.37.1761602959448; Mon, 27 Oct 2025 15:09:19 -0700 (PDT) Date: Mon, 27 Oct 2025 22:09:12 +0000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.51.1.838.g19442a804e-goog Message-ID: <20251027220914.2665978-1-xur@google.com> Subject: [PATCH v4 0/2] kbuild: distributed build support for Clang ThinLTO 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 , Teresa Johnson Cc: linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, llvm@lists.linux.dev Content-Type: text/plain; charset="UTF-8" From: Rong Xu This V4 is based on the reimplementation provided by Masahiro Yamada on May 26. The difference is that this version now saves the compiler flags (_c_flags) from the Front-End (FE) compilation and re-uses them for the subsequent Back-End (BE) compilation. Rong Xu (2): kbuild: move vmlinux.a build rule to scripts/Makefile.vmlinux_a kbuild: distributed build support for Clang ThinLTO .gitignore | 2 + Makefile | 25 +++++------- arch/Kconfig | 19 +++++++++ scripts/Makefile.lib | 7 ++++ scripts/Makefile.thinlto | 40 ++++++++++++++++++ scripts/Makefile.vmlinux_a | 83 ++++++++++++++++++++++++++++++++++++++ scripts/mod/modpost.c | 15 +++++-- 7 files changed, 174 insertions(+), 17 deletions(-) create mode 100644 scripts/Makefile.thinlto create mode 100644 scripts/Makefile.vmlinux_a base-commit: dcb6fa37fd7bc9c3d2b066329b0d27dedf8becaa -- 2.51.1.838.g19442a804e-goog