From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=ZzWv=53=gmail.com=jwakely.gcc@sourceware.org>
Received: from mail-ed1-x536.google.com (mail-ed1-x536.google.com [IPv6:2a00:1450:4864:20::536])
	by sourceware.org (Postfix) with ESMTPS id 38F133858C50
	for <gcc-help@gcc.gnu.org>; Mon, 30 Jan 2023 23:37:04 +0000 (GMT)
DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 38F133858C50
Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=gmail.com
Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=gmail.com
Received: by mail-ed1-x536.google.com with SMTP id f7so5509774edw.5
        for <gcc-help@gcc.gnu.org>; Mon, 30 Jan 2023 15:37:04 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20210112;
        h=cc:to:subject:message-id:date:from:in-reply-to:references
         :mime-version:from:to:cc:subject:date:message-id:reply-to;
        bh=pieZbcFLAMHp7cnK5MdUgh3FPQa2uU2aeMUYXBdqvik=;
        b=CccGRRseMKfdy4+TEcsaN9ABQV1uQioq06FmwMxk8QfhdnLtjduVA48c/o7kRtB6Lm
         40cBYVfnMdbZCbfjxf3OtBCnyPyrdWAYaL7iaUzACwWtXeQAZE8kM0FiHsXI4Duxc8eu
         CmLaKd1KjrdSGPBzV/vrkl7ey+Q7QjQh4+Zf+ckm61KOL/ZgQOCyIdpTBwl7/y9mLLGl
         ZHxBFgDpYtspLXsQJxo+0ljwO2BN9qahMz/WMqyv9mRHnmsDgVWwGYkho2loRB+8nXsb
         rkqDuPm3+P+oJdcziAjYpU5rlvpPwd3QdKvgGYJ4KYIOGLudJzWDCC4uiENp/GScnikY
         5ZYQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20210112;
        h=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=pieZbcFLAMHp7cnK5MdUgh3FPQa2uU2aeMUYXBdqvik=;
        b=C1qKpuTEUybFMhPBtjhNFJmRsssIKJeIgIPVJp8y9WtHzxbXIXXOiQWg0/05amHfe1
         D0uEYedy5LT4BM/BTDS9bcNZVI3beZTqpa11boL2j/1HifJyfC4AHjk5gtin0mHo4gp0
         VoRSI/jBkdrbSJ6vfUsJ+kYYssRf7g+e992yb58qV6gYkvW6y3XFcukxYsbB67uliilm
         UP9z69wn5JUbxnv5MotaSI3ENlVQIhBJIYHH02vc2EcAL/wUYkgFd2Nx7EhlcaLdp/R/
         p+uLeEUmXhw14R9tydOBRcFK9Ee+0f6W9KdvATi3NZLTcewBLd2G9V4Rre44TNeUQGbf
         ruiA==
X-Gm-Message-State: AFqh2kpogyYCJ+9xShPy29vec9w5RbbHaQo9zE3gMzDVz7/g7Ft+K7OH
	edQHVbC+/Du/4I7IZRoA1GVxYKsva6zrqRRl0rE=
X-Google-Smtp-Source: AMrXdXsqzrKW5CtlY5p5Ry7WZMy25Tjaz1p5r4FioLc+Nk5CcLWCquSttGFzsTzDywrHLibGS8PGaNXlhwiHEuKqWkk=
X-Received: by 2002:a05:6402:4494:b0:49e:89e:c7b4 with SMTP id
 er20-20020a056402449400b0049e089ec7b4mr9184520edb.1.1675121822284; Mon, 30
 Jan 2023 15:37:02 -0800 (PST)
MIME-Version: 1.0
References: <CACMdL5+OX879q0Fhbuqd65P5_kL+zSwstKOX0FbYd_1-bFUWtg@mail.gmail.com>
In-Reply-To: <CACMdL5+OX879q0Fhbuqd65P5_kL+zSwstKOX0FbYd_1-bFUWtg@mail.gmail.com>
From: Jonathan Wakely <jwakely.gcc@gmail.com>
Date: Mon, 30 Jan 2023 23:36:51 +0000
Message-ID: <CAH6eHdR6ZJi=tXP_eUqqOU3-T7vCy5pjxq-5n39j_pa2iKAEmQ@mail.gmail.com>
Subject: Re: how does -Wstringop-truncation work?
To: Patrick Herbst <paherbst@gmail.com>
Cc: gcc-help <gcc-help@gcc.gnu.org>
Content-Type: text/plain; charset="UTF-8"
X-Spam-Status: No, score=-0.7 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,KAM_SHORT,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: <gcc-help.gcc.gnu.org>

On Mon, 30 Jan 2023 at 22:36, Patrick Herbst via Gcc-help
<gcc-help@gcc.gnu.org> wrote:
> but i cannot get it to display if not using optimization.  I've even
> tried manually adding all the -f options documented for -O1 to
> understand what other flags might be needed to generate the warning.
> I've had no success.

Because you can't enable optimization with -f options.

See https://gcc.gnu.org/wiki/FAQ#optimization-options

If you don't use one of the -Ox optimization options then **no**
optimization passes run at all, so enabling and disabling individual
optimization passes with -fxxx options has no effect, They're just
skipped completely.