From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from resqmta-c1p-024062.sys.comcast.net (resqmta-c1p-024062.sys.comcast.net [IPv6:2001:558:fd00:56::7]) by sourceware.org (Postfix) with ESMTPS id DF6C03858D37 for ; Tue, 21 Mar 2023 16:56:04 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org DF6C03858D37 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=comcast.net Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=comcast.net Received: from resomta-c1p-023269.sys.comcast.net ([96.102.18.227]) by resqmta-c1p-024062.sys.comcast.net with ESMTP id eb2tpERCcGdamefHGpRhZP; Tue, 21 Mar 2023 16:56:02 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=20190202a; t=1679417762; bh=+4Rb2wX8I95ybYSQi+X8mbv4A901hZuuJMht5kJJ4Fs=; h=Received:Received:Content-Type:Mime-Version:Subject:From:Date: Message-Id:To:Xfinity-Spam-Result; b=otvCf7sftkTlNtT+nL8hXwtKdcEQy98JuMng/KezeLRQOUXAu7+gpwI4es7aaRE0Q RQkJWnl064411IzpIe6+zI/3UGoUOM7GrqvpZCJszDB8BHuQjRQ6dFv1Qe25RrvSeg KZVj4wL7Y1KOUxZECst8aUfXHNp0JjnaIBShSKq0j9OT/aR5fX28nDhhpHRA1GM3WX ZvHcWAGhQ2hWJzdDOxXY8fK7aQoWgSuPSUh94zEKrrAJt0Rh+xMcUJyn+jeG1CjfCR K9j05nE02uePGugNMEnNHpr/AA+I1e5txocs9ZZ+YJIpAPUC55aKvKhqiGpuC50ZPD Lvs6jsQIw5KOA== Received: from smtpclient.apple ([73.60.223.101]) by resomta-c1p-023269.sys.comcast.net with ESMTPSA id efHEpeLDhlMxiefHFpH4G7; Tue, 21 Mar 2023 16:56:01 +0000 X-Xfinity-VAAS: gggruggvucftvghtrhhoucdtuddrgedvhedrvdegtddgleefucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuvehomhgtrghsthdqtfgvshhipdfqfgfvpdfpqffurfetoffkrfenuceurghilhhouhhtmecufedtudenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurheptggguffhjgffvefgkfhfvffosehtqhhmtdhhtddvnecuhfhrohhmpefrrghulhcumfhonhhinhhguceophgruhhlkhhonhhinhhgsegtohhmtggrshhtrdhnvghtqeenucggtffrrghtthgvrhhnpeevkeevleffleeigfeiudefheegjedthfegudejheeukeeitdfgteffvefggffgvdenucfkphepjeefrdeitddrvddvfedruddtudenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhephhgvlhhopehsmhhtphgtlhhivghnthdrrghpphhlvgdpihhnvghtpeejfedriedtrddvvdefrddutddupdhmrghilhhfrhhomhepphgruhhlkhhonhhinhhgsegtohhmtggrshhtrdhnvghtpdhnsggprhgtphhtthhopedvpdhrtghpthhtohepqhhinhhgrdiihhgrohesohhrrggtlhgvrdgtohhmpdhrtghpthhtohepghgttgdqphgrthgthhgvshesghgttgdrghhnuhdrohhrgh X-Xfinity-VMeta: sc=-100.00;st=legit Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3696.120.41.1.2\)) Subject: Re: Should -ffp-contract=off the default on GCC? From: Paul Koning In-Reply-To: Date: Tue, 21 Mar 2023 12:56:00 -0400 Cc: gcc Patches Content-Transfer-Encoding: quoted-printable Message-Id: <87384938-FDB1-487B-8B03-7787996435B2@comcast.net> References: <6659A77B-DA2F-40A6-BDBD-E8B29B9E901D@oracle.com> To: Qing Zhao X-Mailer: Apple Mail (2.3696.120.41.1.2) X-Spam-Status: No, score=-2.8 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,SPF_HELO_PASS,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 Mar 21, 2023, at 11:01 AM, Qing Zhao via Gcc-patches = wrote: >=20 > ... > Most of the compiler users are not familiar with language standards, = or no access to language standards. Without clearly documenting such = warnings along with the option explicitly, the users have not way to = know such potential impact. With modern highly optimized languages, not knowing the standard is = going to get you in trouble. There was a wonderful paper from MIT a few = years ago describing all the many ways C can bite you if you don't know = the rules. paul