From: Jim Wilson <wilson@cygnus.com>
To: mrs@wrs.com (Mike Stump)
Cc: pbarada@wavemark.com, egcs@cygnus.com
Subject: Re: m68k structure packing
Date: Thu, 02 Oct 1997 20:01:00 -0000 [thread overview]
Message-ID: <199710030300.UAA16069@cygnus.com> (raw)
In-Reply-To: <199710012207.PAA01493@kankakee.wrs.com>
... code that sets a pointer to the address of an unaligned packed
structure member...
Should the above code fail at runtime?
Yes, it should fail, because the address is not valid for its type.
Someday, we will be able to say something like:
short *ip __attribute__ ((unaligned));
and then it will work, because gcc will know that it needs to emit special
code to derefence the pointer. Meanwhile, you can't expect it to work
portably.
Jim
next prev parent reply other threads:[~1997-10-02 20:01 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-10-01 15:08 Mike Stump
1997-10-01 15:56 ` Peter Barada
1997-10-01 16:16 ` Per Bothner
1997-10-02 20:14 ` Jim Wilson
1997-10-02 6:49 ` Paul Koning
1997-10-02 20:09 ` Jim Wilson
1997-10-02 20:01 ` Jim Wilson [this message]
1997-10-02 21:40 ` Richard Henderson
-- strict thread matches above, loose matches on Subject: below --
1997-10-01 12:16 Mike Stump
1997-10-01 12:39 ` Joel Sherrill
1997-10-02 18:37 ` Jim Wilson
1997-09-30 21:42 Jim Wilson
1997-10-01 5:44 ` Kamil Iskra
1997-09-30 20:16 Mike Stump
1997-09-30 22:03 ` Jeffrey A Law
1997-09-30 16:58 Mike Stump
1997-09-30 18:20 ` Jim Wilson
1997-10-01 9:02 ` Peter Barada
1997-09-30 13:32 Mike Stump
1997-09-30 14:56 ` Jim Wilson
1997-09-30 12:08 Mike Stump
1997-09-30 12:57 ` Charles M. Hannum
1997-09-30 19:58 ` Jim Wilson
1997-09-30 21:13 ` Richard Henderson
1997-09-30 21:22 ` Jim Wilson
1997-10-01 15:14 ` Jim Wilson
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