From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 BF22047CC82; Thu, 10 Sep 2026 12:25:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789043146; cv=none; b=gPUbWCk2mZNjHQLpD1LCDIc7EW4xao29F5vIvcCSrPfMWiVJnzjYqN1Mhcd1AsfrSkfOueKAyvzeoViZPeUwhnIDduJH6Jb7DFYEi1q2Ef3EEVBFQKj7TYDjkIwbXCoAQQx/YCOh4COVxnyxotm347/o+N5VUHuQ5uLlALBkX28= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789043146; c=relaxed/simple; bh=BO6TOgtbP8xX9WEKqa3BajNVFuzPTWio3Zhgdhs9daE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=kpVupIXh/kidnQOpib9mro4JBMwaVwX2kzAJ3jpdTWBvhlwfhC5HotuC1EQmtwjFOKb+MXa9/vDQOaRQVYNFryRxGWZSvkpBCRAAnVfyIEu03jAO1w9nsC0Vfa1Sw/pTXff0fN/8Sk8y6+mJ96s5Qu6j9r9plWBSmtj6UT/Jq5Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PI8pDV1p; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PI8pDV1p" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B1C331F000FF; Thu, 10 Sep 2026 12:25:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789043144; bh=r3Gniwpo9ILrHoRb1aFF/nqXCtCQyWfCq/qLdr8+214=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=PI8pDV1prtOGYW7AWbHlLpNTedtkWAPrIKf1M5A7RKP0hM+8yxmyoUu6OFEVzKG/q XixS2nm/5Eou4W/qCEB3ONp1Yc9ZySHO3GOg3k4oPK0F+5UPjC9PFm6ZW6SwjCcivm 9Ix17KysnbobtA/5+LI+/oa9NAk6lS57l9t3ZAlcJcP/DM5W+fxMmXWRhVgFkMqB7N 7xbpELojA6FZ71lAWC+hAB+XLJAikRriFccjpI8n+0t10y+9OF2Bo8NK/7xrY72Tg1 wxA/kLVbRVcP7aI18eu+UVFWzMsGpo1WD8uaVzVKCtPcgRQTaYdb3Iy3Y+/rhyOZM5 jRCLkt9dwKK9w== Date: Thu, 10 Sep 2026 14:25:26 +0200 From: "Nicolas Schier (FRITZ!)" To: =?iso-8859-1?Q?Bj=F6rn?= Baron Cc: "Lorenzo Stoakes (ARM)" , Linus Torvalds , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Masahiro Yamada , Alexey Gladkov , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Arnd Bergmann , Catalin Marinas , Will Deacon , Mark Rutland , Ard Biesheuvel , Ilias Apalodimas , Josh Poimboeuf , Peter Zijlstra , Miguel Ojeda , Boqun Feng , Gary Guo , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Daniel Almeida , Tamir Duberstein , Alexandre Courbot , Onur =?iso-8859-1?Q?=D6zkan?= , Jonathan Corbet , Randy Dunlap , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, linux-riscv@lists.infradead.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-efi@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-doc@vger.kernel.org, Jens Axboe Subject: Re: [PATCH 20/23] kbuild: rust: parallelise rustc front end Message-ID: References: <20260908-build-speedup-v1-0-5dc1ac01672d@kernel.org> <20260908-build-speedup-v1-20-5dc1ac01672d@kernel.org> 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=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Wed, Sep 09, 2026 at 10:22:33AM +0000, Björn Baron wrote: [...] > I tried implementing this a couple of years ago, but back then > if I recall correctly either binutils ar or llvm-ar was unable to produce a > thin archive referencing members of another archive like Kbuild expects to > do. I'm not familiar enough with Kbuild to know how to skip the thin > archive production. You might be referencing to llvm-ar <= 14, cp. https://git.kernel.org/stable/c/a48bd961fb20 https://github.com/llvm/llvm-project/commit/d17c54d17de22d2961a04163f3dbc8e973de89b8 -- Nicolas