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Re: How to turn off NRVO in gcc

From: Joe Buck <Joe dot Buck at synopsys dot COM>
To: Ian Lance Taylor <iant at google dot com>
Cc: Debarshi Sanyal <debarshisanyal at gmail dot com>, gcc at gcc dot gnu dot org
Date: Wed, 7 Nov 2007 08:37:11 -0800
Subject: Re: How to turn off NRVO in gcc
References: <13c56af70711070610o52228b59n3bdbafbdb530d05c@mail.gmail.com> <m3hcjyrr8a.fsf@localhost.localdomain>

On Wed, Nov 07, 2007 at 07:48:53AM -0800, Ian Lance Taylor wrote:
> "Debarshi Sanyal" <debarshisanyal@gmail.com> writes:
> 
> >    Is there any way to turn off "named return value optimization"
> > (NRVO) while compiling a C++ program with g++?
> 
> This question is not appropriate for gcc@gcc.gnu.org, which is for
> developers of gcc.  It is appropriate for gcc-help@gcc.gnu.org.
> Please take any followups to that mailing list.  Thanks.
> 
> The answer to your question is no.  g++ will always implement NRVO
> when possible.

You forgot about -fno-elide-constructors , Ian.  I've needed it in
the past to work around a bug in profiling; there's a PR for this.

Follow-Ups:
- Re: How to turn off NRVO in gcc
  - From: Ian Lance Taylor

References:
- How to turn off NRVO in gcc
  - From: Debarshi Sanyal
- Re: How to turn off NRVO in gcc
  - From: Ian Lance Taylor

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