From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-vs1-xe2c.google.com (mail-vs1-xe2c.google.com [IPv6:2607:f8b0:4864:20::e2c]) by sourceware.org (Postfix) with ESMTPS id 60D713858CDA for ; Fri, 28 Oct 2022 18:45:59 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 60D713858CDA Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=gwmail.gwu.edu Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=gwmail.gwu.edu Received: by mail-vs1-xe2c.google.com with SMTP id n63so5976354vsc.8 for ; Fri, 28 Oct 2022 11:45:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gwmail.gwu.edu; s=google; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=1aIdFFG8d1We8LXMP6yEuNQT7lTJbuNi7QQcz3ytWDg=; b=CXlqu1Ir2b7DX9oZD+m4P+Apm4iqC7TCHjjPtc4uOzwlfDRdvwH5xvezxTMFHm6yZH XHKVglScTd4pkI0ivPvNGlQaT7Y4wuvwGqF5P9Qkc1UJywaL1hxTmufyOJ3QiVzc58F1 XBosvERn7djSm6zxXoHT3/UtYMyxogotWWBstVE9xpov4eMxC+IxpsBLnbnT7CpWmqUq slLaHs7CMkUARq+ZCRhnt3f8UWA8JpbnzHfQ/mQVhst+sLo+TdfiZsw+ceAvzpo2XreU /IjwjcYj/HaaZZpPBMwhutHTSfbVAj655mTjScUzqdDcu6jzX3FeppF9WOq0ge8wPMy4 uZlg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=1aIdFFG8d1We8LXMP6yEuNQT7lTJbuNi7QQcz3ytWDg=; b=0iBBzznhzT7JFViHhPmrVJKWKB1s1RrbOElktwDhBHIJjnJ8WV7z6g8H+ueWn9DldS QD78QSea3Hj03lZqZgM05H0Orh+6F0oQkXhOLxekmvptDxjF6wG5QRrtrUWHek0Un36g L32pV4STUItzDf/iD57Iho3f6qY73V13bPqCE6jMOW8MjCOk2BP7b8+fiUWM6/RUZozQ rnY5hl13oJkIIB8YE5rNKqws+ppXMzg6gr8uZfMJJViHpTZrU0216064itWIasxCr4UZ r+mCHIRX/f2D+JTCd4VZ2uNSyi12XI9lxi5s94EhDvHwtgwRScM+mE0P1PYQQcK46ZbG Bbaw== X-Gm-Message-State: ACrzQf3AIqN2Xcv1FY7IUOSdI+BNVjW5zllDU4Z+dTBKcS0hZng6610k qym6LW+QeybGPqzkhwqJRTtksA0Dn0E+7InpPG+WdQ== X-Google-Smtp-Source: AMsMyM4zHwGXJWlwBRzZYwwgXb3VD6QYf8N6djTn4M+gCjNSDHmSUive03rUY/saTc1CgU5i+iP+zsgJ5aAJhnHhgJs= X-Received: by 2002:a67:d31b:0:b0:3aa:6178:5d02 with SMTP id a27-20020a67d31b000000b003aa61785d02mr351565vsj.83.1666982758666; Fri, 28 Oct 2022 11:45:58 -0700 (PDT) MIME-Version: 1.0 References: <9321d38e-a185-5505-62a5-574d64446798@suse.cz> In-Reply-To: <9321d38e-a185-5505-62a5-574d64446798@suse.cz> From: Eric Gallager Date: Fri, 28 Oct 2022 14:45:47 -0400 Message-ID: Subject: Re: [PATCH] docs: document sanitizers can trigger warnings To: =?UTF-8?Q?Martin_Li=C5=A1ka?= Cc: gcc-patches@gcc.gnu.org, Jakub Jelinek Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Status: No, score=-7.8 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,GIT_PATCH_0,JMQ_SPF_NEUTRAL,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On Wed, Oct 26, 2022 at 7:09 AM Martin Li=C5=A1ka wrote: > > PR sanitizer/107298 > > gcc/ChangeLog: > > * doc/invoke.texi: Document sanitizers can trigger warnings. > --- > gcc/doc/invoke.texi | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi > index 64f77e8367a..1ffbba16a72 100644 > --- a/gcc/doc/invoke.texi > +++ b/gcc/doc/invoke.texi > @@ -16460,6 +16460,10 @@ by this option. > > @end table > > +Note the enabled sanitizer options tend to increase a false-positive rat= e > +of selected warnings, most notably @option{-Wmaybe-uninitialized}. > +And thus we recommend to disable @option{-Werror}. > + I'd recommend rewording the second sentence there as: "Thus, GCC developers recommend disabling @option{-Werror} when using sanitizer options." > While @option{-ftrapv} causes traps for signed overflows to be emitted, > @option{-fsanitize=3Dundefined} gives a diagnostic message. > This currently works only for the C family of languages. > -- > 2.38.0 >