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From: "algrant at acm dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/39383] sizeof object with zero-length array ignores initializer
Date: Thu, 05 Mar 2009 13:19:00 -0000	[thread overview]
Message-ID: <20090305131905.3466.qmail@sourceware.org> (raw)
In-Reply-To: <bug-39383-1535@http.gcc.gnu.org/bugzilla/>



------- Comment #2 from algrant at acm dot org  2009-03-05 13:19 -------
No, the case is an extension to C.  6.5.3.4 was obviously written without
this case in mind.  In this case "the size... of its operand" cannot be
"determined from the type".  Either sizeof doesn't return the (real) size
of the operand, or it isn't determined from the type.  Current GCC behavior
is to have it not return the size of the operand.  That's a valid point of 
view but it does mean one needs to take care when using sizeof on such
objects, and it's worth documenting.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39383


  parent reply	other threads:[~2009-03-05 13:19 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-03-05 12:39 [Bug c/39383] New: " algrant at acm dot org
2009-03-05 13:06 ` [Bug c/39383] " ebotcazou at gcc dot gnu dot org
2009-03-05 13:19 ` algrant at acm dot org [this message]
2009-03-05 13:31 ` ebotcazou at gcc dot gnu dot org
2009-03-05 13:53 ` joseph at codesourcery dot com
2009-03-05 14:48 ` algrant at acm dot org
2009-03-06 14:45 ` algrant at acm dot org
2009-03-06 17:27 ` jsm28 at gcc dot gnu dot org
2009-04-08 21:36 ` b07584 at freescale dot com
2009-04-08 22:54 ` joseph at codesourcery dot com
2009-04-17 22:39 ` anmol at freescale dot com
2009-04-23 15:53 ` anmol at freescale dot com

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