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Re: [v3] Fix Werror breakage (maintainer-mode)

From: Ian Lance Taylor <iant at google dot com>
To: "Richard Guenther" <richard dot guenther at gmail dot com>
Cc: "Gabriel Dos Reis" <gdr at integrable-solutions dot net>, "Paolo Carlini" <paolo dot carlini at oracle dot com>, "Ralf Wildenhues" <Ralf dot Wildenhues at gmx dot de>, gcc-patches at gcc dot gnu dot org, libstdc++ at gcc dot gnu dot org
Date: Mon, 07 Jul 2008 12:43:37 -0700
Subject: Re: [v3] Fix Werror breakage (maintainer-mode)
References: <20080706094423.GB29777@ins.uni-bonn.de> <15555494.1215338889746.JavaMail.oracle@acsmt305.oracle.com> <84fc9c000807060551n6753aca4kf915fee4ff8efc9@mail.gmail.com> <206fcf960807061234u3755f641r1e3a1b5cdf40964a@mail.gmail.com> <84fc9c000807070229y40c1db83i24c42d0d399d669d@mail.gmail.com>

"Richard Guenther" <richard.guenther@gmail.com> writes:

> As I said back in the C++ placement new alias bugs the only way to
> honor the C++ memory model is by properly making _all_ stores
> conflict and to disallow hoisting of loads over stores.  For some common
> cases Ian made it work with CHANGE_DYNAMIC_TYPE_EXPR and
> DECL_NO_TBAA, but obviously this isn't enough once a declared type
> is visible to the compiler.

I'll just note for onlookers that while Richard's position is
certainly coherent, there is no general agreement on this point.  See
the blow-by-blow at http://gcc.gnu.org/PR29286 .

Ian

References:
- [v3] Fix Werror breakage (maintainer-mode)
  - From: Ralf Wildenhues
- Re: [v3] Fix Werror breakage (maintainer-mode)
  - From: Paolo Carlini
- Re: [v3] Fix Werror breakage (maintainer-mode)
  - From: Richard Guenther
- Re: [v3] Fix Werror breakage (maintainer-mode)
  - From: Gabriel Dos Reis
- Re: [v3] Fix Werror breakage (maintainer-mode)
  - From: Richard Guenther

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