From patchwork Fri Jun 17 02:54:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "H.J. Lu" X-Patchwork-Id: 55155 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 78493385AE6C for ; Fri, 17 Jun 2022 02:54:56 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 78493385AE6C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1655434496; bh=YOTGtUclX7j7qXrYqouxHcES+QeuKG0z6NrEDv2e3zE=; h=To:Subject:Date:List-Id:List-Unsubscribe:List-Archive:List-Post: List-Help:List-Subscribe:From:Reply-To:From; b=LbhMF9Pf+Nt2qvML7XXGyQX7gAIKI8jCWaw/RS5NKFGCB9iaCJICeSNWg8B2R8Xh4 Ya/YwbcCu2F94MjOJz/2SS2mThto00RK9xMCTYpadpLcKcpcFsKduETD0y++F0LEnp jArtFJtYuXgA2xiUNQblWjhSpTuBOSkXqLiI25gU= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-pj1-x102a.google.com (mail-pj1-x102a.google.com [IPv6:2607:f8b0:4864:20::102a]) by sourceware.org (Postfix) with ESMTPS id 2EFDA386F0DF for ; Fri, 17 Jun 2022 02:54:35 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 2EFDA386F0DF Received: by mail-pj1-x102a.google.com with SMTP id b12-20020a17090a6acc00b001ec2b181c98so1832742pjm.4 for ; Thu, 16 Jun 2022 19:54:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=YOTGtUclX7j7qXrYqouxHcES+QeuKG0z6NrEDv2e3zE=; b=4SeCx6lPZb/q9OE0Tk6LQAY6G7t70o3H7Sy37/UiT3xFknqd+3gmvVaCY0t9GGLwoA vPHdeuthVVBdzqfU16KCyJNiMhdVI8QcFLcZclK9MTXxqjcr4ZpqAN1f6bSjfmdN14FC R5Py5kz8/vFw2s16Qvou5xdDbgPyJDQdjE1t66a/wlhd2u82AWfbhu03s5FeONPDnz97 W4i/R9KKBYVQXQsyTZaAzcbeilBL973J1g/2StKiO2LMQjRjgHPkYcQMWzaoDJ3gG33Y NeJmi00veqShPmfW12CWlrOYjZg/H6xXR6FhbJryLdeWzR5sdbrrZ0+ukIWAEibArnGM qucw== X-Gm-Message-State: AJIora9SVJvjjvJDDLxgEhdRRsoK+WQ89g3nVhMgHIHFnvw7FXN7fAD3 QT0c+3XW/wXqonzWwn6HJDs= X-Google-Smtp-Source: AGRyM1sixU139xdYbJcskxKysWoJeoIhYBXqxBvJiPaRbXoZHdA1+TgLh/eUcBh5Ae1uleTzfwlhbQ== X-Received: by 2002:a17:902:eb90:b0:163:e4c1:b2fc with SMTP id q16-20020a170902eb9000b00163e4c1b2fcmr7409807plg.159.1655434474168; Thu, 16 Jun 2022 19:54:34 -0700 (PDT) Received: from gnu-tgl-2.localdomain ([172.58.37.78]) by smtp.gmail.com with ESMTPSA id a14-20020a63704e000000b00408c592db61sm2517308pgn.71.2022.06.16.19.54.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Jun 2022 19:54:33 -0700 (PDT) Received: from gnu-tgl-2.. (localhost [IPv6:::1]) by gnu-tgl-2.localdomain (Postfix) with ESMTP id 65A663005E3; Thu, 16 Jun 2022 19:54:31 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH v3] elf: Silence GCC 11/12 false positive warning Date: Thu, 16 Jun 2022 19:54:31 -0700 Message-Id: <20220617025431.1087848-1-hjl.tools@gmail.com> X-Mailer: git-send-email 2.36.1 MIME-Version: 1.0 X-Spam-Status: No, score=-3027.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: "H.J. Lu via Libc-alpha" From: "H.J. Lu" Reply-To: "H.J. Lu" Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" Silence GCC 11/12 false positive warning with -mavx512f on dl-load.c: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106008 $ gcc -O2 -fPIC -march=x86-64 -mavx512f -S -Wall ... dl-load.c: In function ‘_dl_map_object_from_fd.constprop’: dl-load.c:1158:30: warning: ‘(((char *)loadcmds.113_68 + _933 + 16))[329406144173384849].mapend’ may be used uninitialized [-Wmaybe-uninitialized] --- elf/dl-load.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/elf/dl-load.c b/elf/dl-load.c index 2e4a010fc5..400b2b8d7b 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -1152,10 +1152,19 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd, p_align_max = ph->p_align; c->mapoff = ALIGN_DOWN (ph->p_offset, GLRO(dl_pagesize)); + DIAG_PUSH_NEEDS_COMMENT; + +#if __GNUC_PREREQ (11, 0) + /* Suppress valid GCC warning: + ‘(((char *)loadcmds.113_68 + _933 + 16))[329406144173384849].mapend’ may be used uninitialized [-Wmaybe-uninitialized] + */ + DIAG_IGNORE_NEEDS_COMMENT (11, "-Wmaybe-uninitialized"); +#endif /* Determine whether there is a gap between the last segment and this one. */ if (nloadcmds > 1 && c[-1].mapend != c->mapstart) has_holes = true; + DIAG_POP_NEEDS_COMMENT; /* Optimize a common case. */ #if (PF_R | PF_W | PF_X) == 7 && (PROT_READ | PROT_WRITE | PROT_EXEC) == 7