From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0AE9DC4167B for ; Fri, 4 Dec 2020 22:53:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C69B222D50 for ; Fri, 4 Dec 2020 22:53:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726488AbgLDWxe (ORCPT ); Fri, 4 Dec 2020 17:53:34 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59030 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726296AbgLDWxe (ORCPT ); Fri, 4 Dec 2020 17:53:34 -0500 Received: from mail-vs1-xe42.google.com (mail-vs1-xe42.google.com [IPv6:2607:f8b0:4864:20::e42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6B4EAC061A52 for ; Fri, 4 Dec 2020 14:52:54 -0800 (PST) Received: by mail-vs1-xe42.google.com with SMTP id h6so4171603vsr.6 for ; Fri, 04 Dec 2020 14:52:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=APDwfrMJO9jpMmlvJs1QQfYlFxkBjLtMOQGI8Flupio=; b=vlYT2PP85xGxgcq4Dr0LjAqfSnHTJbDN9Qw9s716INhVlK2qIKh97cH0so65YWekJV ZkCddAaWBBeVyc79V1Qsk0bwBXFOYV/fbRRVmb3hqZ90wFkxjB6PyGd9Fl/4pFQAhhjZ AM6IB7GFEBqHL1Jg9yyWo4W0Nb7mb6UJHeOQir6VApItA3LGKTPi0G3m3U6izolVWg8S lneowIrUY4bLqR7zyKu8N2F2ZMtJSwvpwOZjKssZqamx23Iv78VtDQw/lQdiC6Po0aWG caBNxURcOkyiTRCfZKEEQPiFtZ4Uo4eYHfBI8tK9v8an2dHQPAwNADLFINV3H5bQRJ9b cZUQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=APDwfrMJO9jpMmlvJs1QQfYlFxkBjLtMOQGI8Flupio=; b=HtYpzPxx/lgTuhMd1cA0QNUkSCCGfZgJkueVThZm3UlN6IvOaw/wpfehtIsW7Tk8K2 M83G6ZmQhCRokrI8JBrK351K1rhgI/fvkKnVL3+e2Z6FX1pI1ATyp/OunJgfrG7tMo7Z Nk9PSfBa98Y+F7lmLoonZoEufM/1uO+FfbReG+7ihpw1I0R3PRm952YbFrv3OJrtjH5+ 1YeeTu9T+Psod8kFkN0RdFcwN99pKpbe0xG3NOUOKTKAJwpoMNfav4ew9n0azXYWviV2 4a88l/Mn1ZjtJcuBzdXNRHNo/JyD83FfNv4ldXrk1RhegXJolVal4j29rOA5n3krgtRC eMyQ== X-Gm-Message-State: AOAM5317icJlnXZn2I7RZv6jrYHdOkEW8xVinI8XaWxy/JreIy2276BW egqIbieAVHBoXGni31b1NwmCFkMNCjtmBhvD/c5+dA== X-Google-Smtp-Source: ABdhPJyEOufu1IYsUQg6fXqokcGK+WOlACM5vK4uRoSLdaEQytBNywFXfXG2M7YwyvYjCJIK/G4zrq6Skn/z29jgixU= X-Received: by 2002:a67:ec3:: with SMTP id 186mr6679107vso.14.1607122373106; Fri, 04 Dec 2020 14:52:53 -0800 (PST) MIME-Version: 1.0 References: <20201201213707.541432-1-samitolvanen@google.com> <20201203112622.GA31188@willie-the-truck> <20201203182252.GA32011@willie-the-truck> In-Reply-To: From: Sami Tolvanen Date: Fri, 4 Dec 2020 14:52:41 -0800 Message-ID: Subject: Re: [PATCH v8 00/16] Add support for Clang LTO To: Nick Desaulniers Cc: Will Deacon , Masahiro Yamada , Nathan Chancellor , Steven Rostedt , Josh Poimboeuf , Peter Zijlstra , Greg Kroah-Hartman , "Paul E. McKenney" , Kees Cook , clang-built-linux , Kernel Hardening , linux-arch , linux-arm-kernel , linux-kbuild , LKML , PCI , Jian Cai , Kristof Beyls Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org On Thu, Dec 3, 2020 at 2:32 PM Nick Desaulniers wrote: > > So I'd recommend to Sami to simply make the Kconfig also depend on > clang's integrated assembler (not just llvm-nm and llvm-ar). Sure, sounds good to me. What's the preferred way to test for this in Kconfig? It looks like actually trying to test if we have an LLVM assembler (e.g. using $(as-instr,.section ".linker-options","e",@llvm_linker_options)) doesn't work as Kconfig doesn't pass -no-integrated-as to clang here. I could do something simple like $(success,echo $(LLVM) $(LLVM_IAS) | grep -q "1 1"). Thoughts? Sami