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From: Richard Henderson <rth@redhat.com> To: nobody@gcc.gnu.org Cc: gcc-prs@gcc.gnu.org, Subject: Re: c/10360: __alignof__(double) answer 8 Date: Wed, 09 Apr 2003 22:46:00 -0000 [thread overview] Message-ID: <20030409224601.2494.qmail@sources.redhat.com> (raw) The following reply was made to PR c/10360; it has been noted by GNATS. From: Richard Henderson <rth@redhat.com> To: Frederic De Jaeger <dejaeger@free.fr> Cc: rth@gcc.gnu.org, discuss-gnustep@gnu.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org, nobody@gcc.gnu.org, richard@brainstorm.co.uk, thoran@free.fr, gcc-gnats@gcc.gnu.org Subject: Re: c/10360: __alignof__(double) answer 8 Date: Wed, 9 Apr 2003 15:40:39 -0700 On Wed, Apr 09, 2003 at 11:59:58PM +0200, Frederic De Jaeger wrote: > Thus, why gcc does not align fields with respect to this *preferred* > alignment? Because the ABI says not to. > How can I compute the address of a field in a record? offsetof. > I need to do this uniformly on all the types. That means I cannot use > the trick : > offset = (char *)&foo.bla - (char *)&foo. > or the "offsetof" macro. Tough luck then. > ... and we expect it to return the alignment used by the compiler (and not > the *preferred* alignment). A meaningless number. Because "the alignment used by the compiler" is going to depend on the context in which it is used. r~
next reply other threads:[~2003-04-09 22:46 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-04-09 22:46 Richard Henderson [this message] -- strict thread matches above, loose matches on Subject: below -- 2003-04-10 8:06 Richard Henderson 2003-04-10 5:16 Richard Frith-Macdonald 2003-04-09 22:06 Frederic De Jaeger 2003-04-09 17:29 rth 2003-04-09 9:06 thoran
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