From patchwork Wed Apr 7 00:24:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Marek_Beh=C3=BAn?= X-Patchwork-Id: 12186387 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 A5572C433B4 for ; Wed, 7 Apr 2021 00:25:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7E92D6128D for ; Wed, 7 Apr 2021 00:25:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236360AbhDGAZj (ORCPT ); Tue, 6 Apr 2021 20:25:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:46934 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236278AbhDGAZg (ORCPT ); Tue, 6 Apr 2021 20:25:36 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 88CA86135D; Wed, 7 Apr 2021 00:25:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1617755127; bh=ZZSSDKuw6U60/IUXxntLjQiuJTcF+qL7DzyhsvdkvJE=; h=From:To:Cc:Subject:Date:From; b=tO88TaR1IV5TWFmXkRY2MHhwc/VKlnvB6C0fJbErAASjkQ+EWnFr06TvxGp7Ds8E/ 27qz4E5Nq1JQ5Wojh0Npo0nxwu2GCwgCtRm88kDuTgiWoJRygna8huB7tqiPZqEKvq vJBydLpuZ8WDWuN2a86n9tx/4juy6ZRKJNVul/HVizfhCG32bGiDgCjhxFyIn+Gyk0 yZ/PYoengNzGLpCIgAuIKadBuUjOgLNEbp1JxB6a4oV8yHhzF2djnMULV/XpEfeD8Y tqTioAkMDzIsQoDkcXxTTKqDVvBif7XP5PBEYc+QFq4XwKLyZIV0pZGnHArgO0iyzR BKk9URX0hsezA== From: =?utf-8?q?Marek_Beh=C3=BAn?= To: linux-kbuild@vger.kernel.org Cc: =?utf-8?q?Marek_Beh=C3=BAn?= , Arnd Bergmann , Nathan Chancellor , Masahiro Yamada , Andrew Lunn , netdev@vger.kernel.org Subject: [PATCH kbuild] Makefile.extrawarn: disable -Woverride-init in W=1 Date: Wed, 7 Apr 2021 02:24:50 +0200 Message-Id: <20210407002450.10015-1-kabel@kernel.org> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org The -Wextra flag enables -Woverride-init in newer versions of GCC. This causes the compiler to warn when a value is written twice in a designated initializer, for example: int x[1] = { [0] = 3, [0] = 3, }; Note that for clang, this was disabled from the beginning with -Wno-initializer-overrides in commit a1494304346a3 ("kbuild: add all Clang-specific flags unconditionally"). This prevents us from implementing complex macros for compile-time initializers. For example a macro of the form INITIALIZE_BITMAP(bits...) that can be used as static DECLARE_BITMAP(bm, 64) = INITIALIZE_BITMAP(0, 1, 32, 33); can only be implemented by allowing a designated initializer to initialize the same members multiple times (because the compiler complains even if the multiple initializations initialize to the same value). Disable the -Woverride-init flag. Signed-off-by: Marek Behún Cc: Arnd Bergmann Cc: Nathan Chancellor Cc: Masahiro Yamada Cc: Andrew Lunn Cc: netdev@vger.kernel.org --- scripts/Makefile.extrawarn | 1 + 1 file changed, 1 insertion(+) diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn index d53825503874..cf7bc1eec5e3 100644 --- a/scripts/Makefile.extrawarn +++ b/scripts/Makefile.extrawarn @@ -36,6 +36,7 @@ KBUILD_CFLAGS += $(call cc-option, -Wstringop-truncation) KBUILD_CFLAGS += -Wno-missing-field-initializers KBUILD_CFLAGS += -Wno-sign-compare KBUILD_CFLAGS += -Wno-type-limits +KBUILD_CFLAGS += $(call cc-disable-warning, override-init) KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1