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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 1BE98C4338F for ; Sun, 1 Aug 2021 21:37:32 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 815FA60F8F for ; Sun, 1 Aug 2021 21:37:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 815FA60F8F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4GdDxj5wD8z3cQS for ; Mon, 2 Aug 2021 07:37:29 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=permerror (SPF Permanent Error: Unknown mechanism found: ip:192.40.192.88/32) smtp.mailfrom=kernel.crashing.org (client-ip=63.228.1.57; helo=gate.crashing.org; envelope-from=segher@kernel.crashing.org; receiver=) Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) by lists.ozlabs.org (Postfix) with ESMTP id 4GdDxH3HdJz2yj0 for ; Mon, 2 Aug 2021 07:37:06 +1000 (AEST) Received: from gate.crashing.org (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.14.1) with ESMTP id 171LWnvj015149; Sun, 1 Aug 2021 16:32:49 -0500 Received: (from segher@localhost) by gate.crashing.org (8.14.1/8.14.1/Submit) id 171LWlIp015148; Sun, 1 Aug 2021 16:32:47 -0500 X-Authentication-Warning: gate.crashing.org: segher set sender to segher@kernel.crashing.org using -f Date: Sun, 1 Aug 2021 16:32:47 -0500 From: Segher Boessenkool To: Alexey Dobriyan Subject: Re: [PATCH 3/3] isystem: delete global -isystem compile option Message-ID: <20210801213247.GM1583@gate.crashing.org> References: <20210801201336.2224111-1-adobriyan@gmail.com> <20210801201336.2224111-3-adobriyan@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210801201336.2224111-3-adobriyan@gmail.com> User-Agent: Mutt/1.4.2.3i X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, Will Deacon , Catalin Marinas , masahiroy@kernel.org, linux-kernel@vger.kernel.org, Paul Mackerras , akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Sun, Aug 01, 2021 at 11:13:36PM +0300, Alexey Dobriyan wrote: > In theory, it enables "leakage" of userspace headers into kernel which > may present licensing problem. > -NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) > +NOSTDINC_FLAGS += -nostdinc This is removing the compiler's own include files. These are required for all kinds of basic features, and required to be compliant to the C standard at all. These are not "userspace headers", that is what -nostdinc takes care of already. In the case of GCC all these headers are GPL-with-runtime-exception, so claiming this can cause licensing problems is fearmongering. I strongly advise against doing this. Segher