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Re: using offsetof with g++

From: Doug Evans <dje at transmeta dot com>
To: Matt Austern <austern at apple dot com>
Cc: gcc at gcc dot gnu dot org
Date: Thu, 6 Nov 2003 11:18:53 -0800 (PST)
Subject: Re: using offsetof with g++
References: <200311061809.KAA04424@casey.transmeta.com><003B6362-108C-11D8-BDB6-00039390D9E0@apple.com>

Matt Austern writes:
 > It's there: -Wno-invalid-offsetof

Thanks.  Too bad it didn't make it into 3.3.2.  Oh well.

 > P.S.  Oh, and the language citation in question is from clause 18.1p5 
 > of the
 > C++ Standard: "The macro offsetof accepts a restricted set of type 
 > arguments
 > in this International Standard.  type shall be a POD structure or a POD
 > union."

Thanks.

 > The word "shall" in this clause means that our compiler is required to 
 > issue
 > a diagnostic for invalid uses.  If we fail to issue a diagnostic, then 
 > the compiler
 > does not conform to the standard.  Test suites should, and do, check 
 > this.

Depending on settings of things like -pedantic, of course.

References:
- using offsetof with g++
  - From: Doug Evans
- Re: using offsetof with g++
  - From: Matt Austern

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