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Re: [wwwdocs] Update coding conventions for C++

From: Jason Merrill <jason at redhat dot com>
To: Lawrence Crowl <crowl at google dot com>
Cc: Chiheng Xu <chiheng dot xu at gmail dot com>, "Joseph S. Myers" <joseph at codesourcery dot com>, Diego Novillo <dnovillo at google dot com>, gcc-patches List <gcc-patches at gcc dot gnu dot org>, Ian Lance Taylor <iant at google dot com>, Benjamin Kosnik <bkoz at redhat dot com>, Gabriel Dos Reis <gdr at cs dot tamu dot edu>, Gerald Pfeifer <gerald at pfeifer dot com>, Richard Guenther <rguenther at suse dot de>, Martin Jambor <mjambor at suse dot cz>, Miles Bader <miles at gnu dot org>, Magnus Fromreide <magfr at lysator dot liu dot se>, Mike Stump <mikestump at comcast dot net>, Alexandre Oliva <aoliva at redhat dot com>
Date: Sun, 01 Jul 2012 11:23:12 -0400
Subject: Re: [wwwdocs] Update coding conventions for C++
References: <CAGqM8fZqRJ-bFQAiMWBP==99ae=ePKUcEwCvQyotuw4Sh=SKDA@mail.gmail.com> <CAGqM8fbU2d7v_aG--LqGhmzi1dOGcHq030BdaSndR6yvT4Ud3A@mail.gmail.com> <CAD_=9DQ5+ie-P0yr8XJBb0EFQmqB7k5XLCh6LtqMn1wX8n6Q4g@mail.gmail.com> <Pine.LNX.4.64.1206251857380.17603@digraph.polyomino.org.uk> <CAGqM8fa=GmKqpPSo-z_m4KcQ2KOTzP3QVLPwzyi_NzdNeMbEAg@mail.gmail.com> <CAGqM8fa2pUWeJm-1rwMLntMc9EAGAp57ys0KEcCcWQP2856rhA@mail.gmail.com> <20120626124513.GB1641@virgil.arch.suse.de> <CAGqM8fYBVqrz-tC_t6r8vO8vN=PCdDaDcCQH_VgLHFScg+9vdg@mail.gmail.com> <20120627132149.GA9901@virgil.arch.suse.de> <CAGqM8fb518gQ69iFSpjOae+UVAxs8xxy8_QDsxvNipdOcHwefw@mail.gmail.com> <CAGqM8fYrwc_1Ldy9+8EPgq1q1ufSSQbSvj7B4JDnUK0KE2-1tg@mail.gmail.com> <CAGqM8fYvdvft3Ecm3Gw-+xZtGLXVmKauPuvDJdSRS0b+prsgBg@mail.gmail.com>

On 06/29/2012 02:17 PM, Lawrence Crowl wrote:

+<h4><a name="RTTI">RTTI and<code>dynamic_cast</code></a></h4>
+
+<p>
+Run-time type information (RTTI) is permitted
+when certain non-default<code>--enable-checking</code>  options are
enabled,
+so as to allow checkers to report dynamic types.
+However, by default, RTTI is not permitted
+and the compiler must build cleanly with<code>-fno-rtti</code>.
+</p>

As discussed, I would say that RTTI is currently not permitted but could be added later. For the rationale, I would say that disabling RTTI saves some space for classes with virtual functions when it isn't used, but could be enabled if it would be useful in some part of the compiler. And then remove the rest of the rationale.

Jason

Follow-Ups:
- Re: [wwwdocs] Update coding conventions for C++
  - From: Lawrence Crowl

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