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Qt-interest Archive, March 2008
qt-4.3.4 with gcc-4.3 on linux/amd64 fails

Message 1 in thread

Hi list,
I wonder if there are known issues. I could not find anything on the web.
Any ideas why this could happen?


Regards,
Hanno


The newly built qmake fails at testruns like:

g++ -o "/mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/bin/qmake" project.o property.o main.o makefile.o unixmake2.o unixmake.o mingw_make.o option.o winmakefile.o projectgenerator.o meta.o makefiledeps.o metamakefile.o xmloutput.o pbuilder_pbx.o borland_bmake.o msvc_dsp.o msvc_vcproj.o msvc_nmake.o msvc_objectmodel.o qstring.o qtextstream.o qiodevice.o qglobal.o qbytearray.o qbytearraymatcher.o qdatastream.o qbuffer.o qlistdata.o qfile.o qfsfileengine_unix.o qfsfileengine_iterator_unix.o qfsfileengine.o qfsfileengine_iterator.o qregexp.o qvector.o qbitarray.o qdir.o qdiriterator.o quuid.o qhash.o qfileinfo.o qdatetime.o qstringlist.o qabstractfileengine.o qtemporaryfile.o qmap.o qmetatype.o qsettings.o qlibraryinfo.o qvariant.o qvsnprintf.o qlocale.o qlinkedlist.o qurl.o qnumeric.o qcryptographichash.o qscriptasm.o qscriptast.o qscriptastvisitor.o qscriptcompiler.o qscriptecmaarray.o qscriptecmaboolean.o qscriptecmacore.o qscriptecmadate.o qscriptecmafunction.o qscriptecmaglobal.o qscriptecmamath.o qscriptecmanumber.o qscriptecmaobject.o qscriptecmaregexp.o qscriptecmastring.o qscriptecmaerror.o qscriptcontext_p.o qscriptengine.o qscriptengine_p.o qscriptextenumeration.o qscriptextvariant.o qscriptcontext.o qscriptfunction.o qscriptgrammar.o qscriptlexer.o qscriptclassdata.o qscriptparser.o qscriptprettypretty.o qscriptsyntaxchecker.o qscriptvalue.o qscriptvalueimpl.o qscriptvalueiterator.o  -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -Wl,--sort-common  
floatmath auto-detection... ()
/mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/config.tests/unix/compile.test: line 55: 19281 Speicherzugriffsfehler  "$OUTDIR/bin/qmake" -nocache -spec "$QMKSPEC" "CONFIG+=$QMAKE_CONFIG" "LIBS*=$LFLAGS" "INCLUDEPATH*=$INCLUDEPATH" "QMAKE_CXXFLAGS*=$CXXFLAGS" "$SRCDIR/$TEST/$EXE.pro" -o "$OUTDIR/$TEST/Makefile"
make: *** Keine Targets angegeben und keine ÂmakeÂ-Steuerdatei gefunden.  Schluss.


The failing command:

/mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/bin/qmake -nocache -spec /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/mkspecs/linux-g++ CONFIG+="" LIBS*="-L/usr/lib64 -L/usr/lib64/mysql" INCLUDEPATH*=/usr/include/mysql QMAKE_CXXFLAGS*="" /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/config.tests/unix/floatmath/floatmath.pro -o /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/config.tests/unix/floatmath/Makefile


In gdb I get this:

Program received signal SIGSEGV, Segmentation fault.
QRegExpCharClass::operator= (this=0x9b92b0, cc=@0x98e4c0) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/include/QtCore/../../src/corelib/arch/qatomic_generic.h:80
80	{ return ++(*ptr); }
(gdb) bt
#0  QRegExpCharClass::operator= (this=0x9b92b0, cc=@0x98e4c0) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/include/QtCore/../../src/corelib/arch/qatomic_generic.h:80
#1  0x00000000005c1b3f in QVector<QRegExpCharClass>::realloc (this=0x9b8750, asize=1, aalloc=3)
    at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/corelib/tools/qregexp.cpp:1022
#2  0x00000000005c1dfd in QVector<QRegExpCharClass>::append (this=0x9b8750, t=<value optimized out>)
    at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/corelib/tools/qvector.h:514
#3  0x00000000005bd073 in QRegExpEngine::createState (this=0x9b8720, cc=<value optimized out>) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/corelib/tools/qvector.h:276
#4  0x00000000005bd19b in QRegExpEngine::Box::set (this=0x7fff745fca10, cc=@0x7fff745fca70) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/corelib/tools/qregexp.cpp:2448
#5  0x00000000005bdf10 in QRegExpEngine::parse (this=0x9b8720, pattern=<value optimized out>, len=<value optimized out>)
    at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/corelib/tools/qregexp.cpp:3025
#6  0x00000000005bea7d in QRegExpEngine (this=0x9b8720, key=@0x9b84b8) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/corelib/tools/qregexp.cpp:1330
#7  0x00000000005becaf in prepareEngine_helper (priv=0x9b84b0) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/corelib/tools/qregexp.cpp:3371
#8  0x00000000005bf745 in QRegExp::operator= (this=0x9b85e0, rx=@0x98e4c0) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/corelib/tools/qregexp.cpp:3382
#9  0x000000000065f40d in QScript::Ecma::RegExp::newRegExp_helper (this=0x9b7f10, result=0x9b7f38, rx=@0x7fff745fcd20, flags=@0x7fff745fcf10)
    at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/script/qscriptecmaregexp.cpp:157
#10 0x00000000006602a6 in QScript::Ecma::RegExp::newRegExp (this=0x9b7f10, result=0x9b7f38, pattern=@0x7fff745fcf00, flags=@0x7fff745fcf10)
    at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/script/qscriptecmaregexp.cpp:128
#11 0x0000000000660c49 in RegExp (this=0x9b7f10, eng=0x99aa20) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/script/qscriptecmaregexp.cpp:66
#12 0x00000000006909f4 in QScriptEnginePrivate::init (this=0x99aa20) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/script/qscriptengine_p.cpp:1509
#13 0x000000000042c6bd in main (argc=<value optimized out>, argv=<value optimized out>) at project.h:120


And just before it segfaults:

(gdb) p cc
$9 = (const QRegExpCharClass &) @0x98e4c0: {c = 10170336, r = {{p = 0x0, d = 0x0}}, n = 7, occ1 = {{p = 0x400000000, d = 0x400000000}}}

cc.r.p and cc.r.d are zero?!


My configuration:

./configure -stl -verbose -largefile -confirm-license -platform linux-g++ -xplatform linux-g++ -no-rpath -prefix /usr -bindir /usr/bin -libdir /usr/lib64/qt4 -datadir /usr/share/qt4 -docdir /usr/share/doc/qt-4.3.4 -headerdir /usr/include/qt4 -plugindir /usr/lib64/qt4/plugins -sysconfdir /etc/qt4 -translationdir /usr/share/qt4/translations -examplesdir /usr/share/qt4/examples -demosdir /usr/share/qt4/demos -L/usr/lib64 -reduce-relocations -accessibility -cups -xinerama -opengl -no-nis -qt-gif -system-libpng -system-libjpeg -no-libtiff -system-zlib -no-libmng -debug -no-separate-debug-info -plugin-sql-mysql -I/usr/include/mysql -L/usr/lib64/mysql -no-sql-psql -no-sql-ibase -no-sql-sqlite -no-sql-sqlite2 -no-sql-odbc -qdbus -no-glib -qt3support -openssl -no-pch -no-tablet -xrender -xrandr -xkb -xshape -sm

This is the Qt/X11 Open Source Edition.

Determining system architecture... (Linux:2.6.24-gentoo-r3:x86_64)
    64-bit AMD 80x86 (x86_64)
    'x86_64' is supported
System architecture: 'x86_64'
Symbol visibility control enabled.
Symbolic function binding enabled

CFLAGS="-O2 -mtune=core2 -march=core2 -pipe -fomit-frame-pointer"
CXXFLAGS="${CFLAGS} -fvisibility-inlines-hidden"
LDFLAGS="-Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -Wl,--sort-common"

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Message 2 in thread

On Thu, March 13, 2008 13:35, Hanno Meyer-Thurow wrote:
> The newly built qmake fails at testruns like:
>
> g++ -o
> "/mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/bin/qmake"
[cut]

You need to install it properly before you can use it. Run "make install"
in the Qt directory, that will usually install it to
/usr/local/Trolltech/Qt-4.3.4

Hint: the qmake used to make Qt itself is slightly different from the one
you need, that's why you get this Error.


    Konrad

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Message 3 in thread

On Thu, 13 Mar 2008 14:33:18 +0100 (CET)
"Konrad Rosenbaum" <konrad@xxxxxxxxx> wrote:

> On Thu, March 13, 2008 13:35, Hanno Meyer-Thurow wrote:
> > The newly built qmake fails at testruns like:
> >
> > g++ -o
> > "/mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/bin/qmake"
> [cut]
> 
> You need to install it properly before you can use it. Run "make install"
> in the Qt directory, that will usually install it to
> /usr/local/Trolltech/Qt-4.3.4

Well, that happens when executing:

	make all

So 'make all' should not call these testruns..?


Regards,
Hanno

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Message 4 in thread

Hi,

I think a possible problem are the -mtune=core2 and -march=core2
CFLAGS combined with an AMD cpu. GCC 4.3 optimizes core2 for Intel's
Core 2 CPUs.

Regards,
Thomas

2008/3/13, Hanno Meyer-Thurow <h.mth@xxxxxx>:
> Hi list,
>  I wonder if there are known issues. I could not find anything on the web.
>  Any ideas why this could happen?
>
>
>  Regards,
>  Hanno
>
>
>  The newly built qmake fails at testruns like:
>
>  g++ -o "/mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/bin/qmake" project.o property.o main.o makefile.o unixmake2.o unixmake.o mingw_make.o option.o winmakefile.o projectgenerator.o meta.o makefiledeps.o metamakefile.o xmloutput.o pbuilder_pbx.o borland_bmake.o msvc_dsp.o msvc_vcproj.o msvc_nmake.o msvc_objectmodel.o qstring.o qtextstream.o qiodevice.o qglobal.o qbytearray.o qbytearraymatcher.o qdatastream.o qbuffer.o qlistdata.o qfile.o qfsfileengine_unix.o qfsfileengine_iterator_unix.o qfsfileengine.o qfsfileengine_iterator.o qregexp.o qvector.o qbitarray.o qdir.o qdiriterator.o quuid.o qhash.o qfileinfo.o qdatetime.o qstringlist.o qabstractfileengine.o qtemporaryfile.o qmap.o qmetatype.o qsettings.o qlibraryinfo.o qvariant.o qvsnprintf.o qlocale.o qlinkedlist.o qurl.o qnumeric.o qcryptographichash.o qscriptasm.o qscriptast.o qscriptastvisitor.o qscriptcompiler.o qscriptecmaarray.o qscriptecmaboolean.o qscriptecmacore.o qscriptecmadate.o qscriptecmafunction.o qscriptecmaglobal.o qscriptecmamath.o qscriptecmanumber.o qscriptecmaobject.o qscriptecmaregexp.o qscriptecmastring.o qscriptecmaerror.o qscriptcontext_p.o qscriptengine.o qscriptengine_p.o qscriptextenumeration.o qscriptextvariant.o qscriptcontext.o qscriptfunction.o qscriptgrammar.o qscriptlexer.o qscriptclassdata.o qscriptparser.o qscriptprettypretty.o qscriptsyntaxchecker.o qscriptvalue.o qscriptvalueimpl.o qscriptvalueiterator.o  -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -Wl,--sort-common
>  floatmath auto-detection... ()
>  /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/config.tests/unix/compile.test: line 55: 19281 Speicherzugriffsfehler  "$OUTDIR/bin/qmake" -nocache -spec "$QMKSPEC" "CONFIG+=$QMAKE_CONFIG" "LIBS*=$LFLAGS" "INCLUDEPATH*=$INCLUDEPATH" "QMAKE_CXXFLAGS*=$CXXFLAGS" "$SRCDIR/$TEST/$EXE.pro" -o "$OUTDIR/$TEST/Makefile"
>  make: *** Keine Targets angegeben und keine »make«-Steuerdatei gefunden.  Schluss.
>
>
>  The failing command:
>
>  /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/bin/qmake -nocache -spec /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/mkspecs/linux-g++ CONFIG+="" LIBS*="-L/usr/lib64 -L/usr/lib64/mysql" INCLUDEPATH*=/usr/include/mysql QMAKE_CXXFLAGS*="" /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/config.tests/unix/floatmath/floatmath.pro -o /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/config.tests/unix/floatmath/Makefile
>
>
>  In gdb I get this:
>
>  Program received signal SIGSEGV, Segmentation fault.
>  QRegExpCharClass::operator= (this=0x9b92b0, cc=@0x98e4c0) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/include/QtCore/../../src/corelib/arch/qatomic_generic.h:80
>  80      { return ++(*ptr); }
>  (gdb) bt
>  #0  QRegExpCharClass::operator= (this=0x9b92b0, cc=@0x98e4c0) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/include/QtCore/../../src/corelib/arch/qatomic_generic.h:80
>  #1  0x00000000005c1b3f in QVector<QRegExpCharClass>::realloc (this=0x9b8750, asize=1, aalloc=3)
>     at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/corelib/tools/qregexp.cpp:1022
>  #2  0x00000000005c1dfd in QVector<QRegExpCharClass>::append (this=0x9b8750, t=<value optimized out>)
>     at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/corelib/tools/qvector.h:514
>  #3  0x00000000005bd073 in QRegExpEngine::createState (this=0x9b8720, cc=<value optimized out>) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/corelib/tools/qvector.h:276
>  #4  0x00000000005bd19b in QRegExpEngine::Box::set (this=0x7fff745fca10, cc=@0x7fff745fca70) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/corelib/tools/qregexp.cpp:2448
>  #5  0x00000000005bdf10 in QRegExpEngine::parse (this=0x9b8720, pattern=<value optimized out>, len=<value optimized out>)
>     at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/corelib/tools/qregexp.cpp:3025
>  #6  0x00000000005bea7d in QRegExpEngine (this=0x9b8720, key=@0x9b84b8) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/corelib/tools/qregexp.cpp:1330
>  #7  0x00000000005becaf in prepareEngine_helper (priv=0x9b84b0) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/corelib/tools/qregexp.cpp:3371
>  #8  0x00000000005bf745 in QRegExp::operator= (this=0x9b85e0, rx=@0x98e4c0) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/corelib/tools/qregexp.cpp:3382
>  #9  0x000000000065f40d in QScript::Ecma::RegExp::newRegExp_helper (this=0x9b7f10, result=0x9b7f38, rx=@0x7fff745fcd20, flags=@0x7fff745fcf10)
>     at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/script/qscriptecmaregexp.cpp:157
>  #10 0x00000000006602a6 in QScript::Ecma::RegExp::newRegExp (this=0x9b7f10, result=0x9b7f38, pattern=@0x7fff745fcf00, flags=@0x7fff745fcf10)
>     at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/script/qscriptecmaregexp.cpp:128
>  #11 0x0000000000660c49 in RegExp (this=0x9b7f10, eng=0x99aa20) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/script/qscriptecmaregexp.cpp:66
>  #12 0x00000000006909f4 in QScriptEnginePrivate::init (this=0x99aa20) at /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/src/script/qscriptengine_p.cpp:1509
>  #13 0x000000000042c6bd in main (argc=<value optimized out>, argv=<value optimized out>) at project.h:120
>
>
>  And just before it segfaults:
>
>  (gdb) p cc
>  $9 = (const QRegExpCharClass &) @0x98e4c0: {c = 10170336, r = {{p = 0x0, d = 0x0}}, n = 7, occ1 = {{p = 0x400000000, d = 0x400000000}}}
>
>  cc.r.p and cc.r.d are zero?!
>
>
>  My configuration:
>
>  ./configure -stl -verbose -largefile -confirm-license -platform linux-g++ -xplatform linux-g++ -no-rpath -prefix /usr -bindir /usr/bin -libdir /usr/lib64/qt4 -datadir /usr/share/qt4 -docdir /usr/share/doc/qt-4.3.4 -headerdir /usr/include/qt4 -plugindir /usr/lib64/qt4/plugins -sysconfdir /etc/qt4 -translationdir /usr/share/qt4/translations -examplesdir /usr/share/qt4/examples -demosdir /usr/share/qt4/demos -L/usr/lib64 -reduce-relocations -accessibility -cups -xinerama -opengl -no-nis -qt-gif -system-libpng -system-libjpeg -no-libtiff -system-zlib -no-libmng -debug -no-separate-debug-info -plugin-sql-mysql -I/usr/include/mysql -L/usr/lib64/mysql -no-sql-psql -no-sql-ibase -no-sql-sqlite -no-sql-sqlite2 -no-sql-odbc -qdbus -no-glib -qt3support -openssl -no-pch -no-tablet -xrender -xrandr -xkb -xshape -sm
>
>  This is the Qt/X11 Open Source Edition.
>
>  Determining system architecture... (Linux:2.6.24-gentoo-r3:x86_64)
>     64-bit AMD 80x86 (x86_64)
>     'x86_64' is supported
>  System architecture: 'x86_64'
>  Symbol visibility control enabled.
>  Symbolic function binding enabled
>
>  CFLAGS="-O2 -mtune=core2 -march=core2 -pipe -fomit-frame-pointer"
>  CXXFLAGS="${CFLAGS} -fvisibility-inlines-hidden"
>  LDFLAGS="-Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -Wl,--sort-common"
>
>
>  --
>  To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with "unsubscribe" in the subject or the body.
>  List archive and information: http://lists.trolltech.com/qt-interest/
>
>

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Message 5 in thread

On Thu, 13 Mar 2008 14:35:18 +0100
"Thomas DÃhling" <t.daehling@xxxxxxxxxxxxxx> wrote:

> Hi,
> 
> I think a possible problem are the -mtune=core2 and -march=core2
> CFLAGS combined with an AMD cpu. GCC 4.3 optimizes core2 for Intel's
> Core 2 CPUs.

O sorry, I meant amd64 as general architecture.
I have Intel's Core2Duo.


Regards,
Hanno

--
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Message 6 in thread

On Thursday 13 March 2008 13:35:46 Hanno Meyer-Thurow wrote:
> Hi list,
> I wonder if there are known issues. I could not find anything on the web.
> Any ideas why this could happen?

I have been using gcc 4.3.0 and 4.3 pre-releases for a while. It and Qt 4.3.4 
work just fine together.

> -Wl,--sort-common floatmath auto-detection... ()
> /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/co
>nfig.tests/unix/compile.test: line 55: 19281 Speicherzugriffsfehler 
> "$OUTDIR/bin/qmake" -nocache -spec "$QMKSPEC" "CONFIG+=$QMAKE_CONFIG"
> "LIBS*=$LFLAGS" "INCLUDEPATH*=$INCLUDEPATH" "QMAKE_CXXFLAGS*=$CXXFLAGS"
> "$SRCDIR/$TEST/$EXE.pro" -o "$OUTDIR/$TEST/Makefile" make: *** Keine
> Targets angegeben und keine ÂmakeÂ-Steuerdatei gefunden.  Schluss.

First of all, please switch your system to English before posting error 
messages to mailing lists. On any Unix system, this will do:
	export LC_ALL=C

The way it is above, I don't know if it's a segmentation fault, bus error, 
assertion failure or whatnot. So I can't help you (at this point, see below).

> In gdb I get this:
>
> Program received signal SIGSEGV, Segmentation fault.
> QRegExpCharClass::operator= (this=0x9b92b0, cc=@0x98e4c0) at
> /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/in
>clude/QtCore/../../src/corelib/arch/qatomic_generic.h:80 80	{ return
> ++(*ptr); }

I've never seen this. I do remember some fixes that went in about gcc's 
optimisation being too aggressive, removing code blocks that actually did 
stuff. It did that because in some places Qt violated/violates strict 
aliasing rules.

> CFLAGS="-O2 -mtune=core2 -march=core2 -pipe -fomit-frame-pointer"
> CXXFLAGS="${CFLAGS} -fvisibility-inlines-hidden"
> LDFLAGS="-Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -Wl,--sort-common"

I'll try the mtune and march options to see what happens.

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Message 7 in thread

On Thu, 13 Mar 2008 15:51:42 +0100
Thiago Macieira <thiago.macieira@xxxxxxxxxxxxx> wrote:

> On Thursday 13 March 2008 13:35:46 Hanno Meyer-Thurow wrote:
> > Hi list,
> > I wonder if there are known issues. I could not find anything on the web.
> > Any ideas why this could happen?
> 
> I have been using gcc 4.3.0 and 4.3 pre-releases for a while. It and Qt 4.3.4 
> work just fine together.

[cut]

> I've never seen this. I do remember some fixes that went in about gcc's 
> optimisation being too aggressive, removing code blocks that actually did 
> stuff. It did that because in some places Qt violated/violates strict 
> aliasing rules.

Correct. Thank you!
Adding '-fno-strict-aliasing' to CFLAGS fixed the build.

Any chance that the Qt build appends that flag to CFLAGS
in these known places?


Regards,
Hanno

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Message 8 in thread

Hanno Meyer-Thurow wrote:
>Any chance that the Qt build appends that flag to CFLAGS
>in these known places?

I think we fixed the issue in Qt 4.4, so no, it won't be necessary to add 
the flag.

However, the fix wasn't backported to 4.3 and probably won't be either.

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Message 9 in thread

Thiago Macieira wrote:

>> In gdb I get this:
>>
>> Program received signal SIGSEGV, Segmentation fault.
>> QRegExpCharClass::operator= (this=0x9b92b0, cc=@0x98e4c0) at
>> /mnt/data/tmp/portage/x11-libs/qt-4.3.4/work/qt-x11-opensource-src-4.3.4/in
>>clude/QtCore/../../src/corelib/arch/qatomic_generic.h:80 80   { return
>> ++(*ptr); }
> 
> I've never seen this. I do remember some fixes that went in about gcc's
> optimisation being too aggressive, removing code blocks that actually did
> stuff. It did that because in some places Qt violated/violates strict
> aliasing rules.

We saw this in combination with -optimized-qmake , the following patch
helped:
http://cvs.fedoraproject.org/viewcvs/*checkout*/devel/qt/qt-x11-opensource-src-4.3.4-aliasing.patch
-- Rex

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