Re: c++/9193: Testsuite error on mips-irix6 with g++.dg/abi/empty6.C (missing -Wabi warning)

[Mark Mitchell <mark@codesourcery.com>]

The following reply was made to PR c++/9193; it has been noted by GNATS.

From: Mark Mitchell <mark@codesourcery.com>
To: "Kaveh R. Ghazi" <ghazi@caip.rutgers.edu>,
   "gcc-gnats@gcc.gnu.org" <gcc-gnats@gcc.gnu.org>
Cc: "gcc-bugs@gcc.gnu.org" <gcc-bugs@gcc.gnu.org>
Subject: Re: c++/9193: Testsuite error on mips-irix6 with
 g++.dg/abi/empty6.C (missing -Wabi warning)
Date: Wed, 08 Jan 2003 09:47:23 -0800

 --On Wednesday, January 08, 2003 12:37:50 PM -0500 "Kaveh R. Ghazi" 
 <ghazi@caip.rutgers.edu> wrote:
 
 >  > From: Mark Mitchell <mark@codesourcery.com>
 >  >
 >  > > and indeed no -Wabi warning is issued.  The failure occurs only when
 > I  > > run the testsuite with -mabi=64, it succeeds without that flag as
 > noted  > > in the test report above.
 >  >
 >  > That's correct behavior; it means that there's no change under that
 > ABI.
 >
 > For my own education, would you please help me understand why the
 > irix6 -mabi=n32 vs -mabi=64 flag affects this, but other 64 bit
 > platforms, or sparc -m64, don't see a change?
 
 Essentially, there's no logical answer.  We were assuming that
 DECL_FIELD_OFFSET meant something it only means sometimes.  On platforms
 where it meant what we thought it meant, we don't need to warn; elsewhere,
 we do.
 
 -- 
 Mark Mitchell                mark@codesourcery.com
 CodeSourcery, LLC            http://www.codesourcery.com