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From: "siarhei dot siamashka at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/45070]  New: Miscompiled c++ class with packed attribute on ARM with -Os optimizations (Qt 4.6.2)
Date: Sun, 25 Jul 2010 23:23:00 -0000	[thread overview]
Message-ID: <bug-45070-14457@http.gcc.gnu.org/bugzilla/> (raw)

Compilation:
   arm-unknown-linux-gnueabi-g++ -Os -mcpu=cortex-a8 -o test test.cpp

Expected results:
   ./test
   65534 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Real results (some garbage data):
   ./test
   544 544 544 544 544 544 544 544 544 544 544 544 544 544 544 544

Note: This is not a big practical issue because Qt 4.7 does not use packed
attribute for QChar anymore (a good idea because using this packed attribute
results in a horribly slow code):
http://qt.gitorious.org/qt/qt/commit/1ec8acd77b6c048f5a68887ac7750b0764ade598


-- 
           Summary: Miscompiled c++ class with packed attribute on ARM with
                    -Os optimizations (Qt 4.6.2)
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: siarhei dot siamashka at gmail dot com
GCC target triplet: arm-unknown-linux-gnueabi


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45070


             reply	other threads:[~2010-07-25 23:23 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-07-25 23:23 siarhei dot siamashka at gmail dot com [this message]
2010-07-25 23:25 ` [Bug c++/45070] " siarhei dot siamashka at gmail dot com
2010-07-26  8:49 ` mikpe at it dot uu dot se
2010-07-26  9:33 ` mikpe at it dot uu dot se
2010-07-28  7:16 ` siarhei dot siamashka at gmail dot com
2010-07-28  7:18 ` siarhei dot siamashka at gmail dot com
2010-07-28  8:37 ` [Bug target/45070] " siarhei dot siamashka at gmail dot com
2010-07-28  9:01 ` ramana at gcc dot gnu dot org
2010-07-28  9:22 ` ramana at gcc dot gnu dot org
2010-07-28  9:35 ` rearnsha at gcc dot gnu dot org
2010-07-28  9:46 ` mikpe at it dot uu dot se
2010-08-03 17:13 ` ian dot bolton at arm dot com
2010-08-14 15:33 ` armin76 at gentoo dot org
2010-08-14 16:28 ` siarhei dot siamashka at gmail dot com
2010-08-19  8:28 ` ramana at gcc dot gnu dot org
2010-09-02 13:06 ` ibolton at gcc dot gnu dot org
2010-09-04 16:42 ` armin76 at gentoo dot org
2010-09-07  9:26 ` ibolton at gcc dot gnu dot org
2010-09-07 11:08 ` ibolton at gcc dot gnu dot org
2010-09-14 14:06 ` rearnsha at gcc dot gnu dot org

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