From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dl1-f74.google.com (mail-dl1-f74.google.com [74.125.82.74]) (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 A24AE35BDDB for ; Mon, 16 Mar 2026 21:29:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.74 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773696580; cv=none; b=h4mAtsuFxZUa3hIYj5B8K98glSzF7esdfACyhU4+apILnb73FnnRkvxAQ2vXSzcwHChg3N7Sq7UOEdn9D8X4WCbWJiEoqhZ6ECznBqMsvm0ZxYZ6EG6wdQK2ftLsTONxF56FUUisR//w63kOXReyaTV6Zmm4TbR49LJY7JXiZOE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773696580; c=relaxed/simple; bh=dxsfmb/YEupislZPlbSsLwHXV0CS/9g8rvxxHXQbzB8=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=jy1xIx0VfOHaalA9hjFhYVJRyPF91SCgQa3wG2VYU0ELNpk6FgVH7vWY9oh4o1ke/j4ZJ/PRwIjWNkhdP2+zS5EUbM/bdlPDycwmgM1mtSAu4WMf8+O/hTKl3oOLEC9TD6HHaadkh+2huTZc09F45bNAMqWzwU1F2U8nE4kMwDE= 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=UCQEMI2q; arc=none smtp.client-ip=74.125.82.74 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="UCQEMI2q" Received: by mail-dl1-f74.google.com with SMTP id a92af1059eb24-128d0a51897so99141468c88.0 for ; Mon, 16 Mar 2026 14:29:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1773696579; x=1774301379; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=vCM8J7LTT/uLe/8rwcEE54UGB7wLbVI5pGYabTGypJg=; b=UCQEMI2qmlGncrr3BTdG+n24OTbl6o14iWlVwCxa7lVAGlR3mmr79uNbr3HYYfr6zY H6Z0r09O73q9mb4OA0Lf7JwYKFKwVAtGnpaxigg7esiTUPUCRRz26F7EK16IKk37PeCA 9f/dyCDuBju24gPaKYS3x0n92kDq6w+/rwSfch6XvIHpXFjADx6TuZom3imGeMGHvbkp +5ZWfTpTtupisH0MNNb71531WD+KyEWy6eIdu+AGptuthkoWb9KbqkjY5fmtHckuP25N hzCNFzL3eaYFTQflBSH1AU2j6hSxN6N+HaMOYo7b9B+awdjbPqxOWVv3MWvjZFZGQvfv VXAg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1773696579; x=1774301379; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=vCM8J7LTT/uLe/8rwcEE54UGB7wLbVI5pGYabTGypJg=; b=Y+lsdPIAC11KNMUwVUnRAXvtV/yKGX1FnMCDQpAGbytZuHvIrYrUmGmqONBMn+M8cg yHoxW0SyF6dtKVs1Jf+XuwrrgMper0M3Erg4etezSEa5BTLhXnDje/JA1JufBEJscWCt Ph2HQdnb8u4XB0FaWl+WIiU1DKgNyf/k9ZlQ6QWlFIIXLqVZJ+e+uEHcKh2kpYkIW0pA /A6q/QBcD8qJUBDn9+uM6UEe1ZrKqzmLGAIgBQ842KbQcDa2eh/eLy7h5n5R0XTZdlPV 6GrRUkF9zbBEdbOiBSO1Z1GqzocFOaB5CexmVeaVUrzMK94SHHwg+9ZZ1DhhglhXWztw Y5Cw== X-Gm-Message-State: AOJu0YyljGA2/bKZ5ZQS4+f2oc31cew8Q9rrnroFB8fdAKXQdYxkjbwf ME363NRiB4p87g5Ijim9pAT9rFfQ1siy6iIUFrs0jjP0SmK0wTGcluh1jDfjv7mbeMoMOQ== X-Received: from dled18-n2.prod.google.com ([2002:a05:701b:42d2:20b0:128:d42d:544e]) (user=xur job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7022:618f:b0:11b:f056:a1b3 with SMTP id a92af1059eb24-128f3d3f175mr8012281c88.11.1773696578552; Mon, 16 Mar 2026 14:29:38 -0700 (PDT) Date: Mon, 16 Mar 2026 21:29:28 +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 2.53.0.851.ga537e3e6e9-goog Message-ID: <20260316212930.120438-1-xur@google.com> Subject: [PATCH v6 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 , Venkat Rao Bagalkote , Miguel Ojeda , 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 ChangeLog: V6: Change '--thin' back to 'T' in Makefile.vmlinux_a to fix reported the build error from old ar. V5: Handle single quote escaping in echo _c_flags to fix Piotr Gorski's reported error. V4: This 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: 2d1373e4246da3b58e1df058374ed6b101804e07 -- 2.53.0.851.ga537e3e6e9-goog