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List:       kde-bindings
Subject:    [Kde-bindings] [Bug 145518] New: QtRuby - Qt::GridLayout.new
From:       Tomi Belan <tomi.belan () gmail ! com>
Date:       2007-05-16 16:36:44
Message-ID: 20070516183643.145518.tomi.belan () gmail ! com
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http://bugs.kde.org/show_bug.cgi?id=145518         
           Summary: QtRuby - Qt::GridLayout.new crashes program;
                    QT_NO_LAYOUT Smoke error
           Product: bindings
           Version: unspecified
          Platform: Mandriva RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: general
        AssignedTo: kde-bindings kde org
        ReportedBy: tomi.belan gmail com


Version:           qt4-qtruby-1.4.7 (using KDE KDE 3.5.5)
Installed from:    Mandriva RPMs
Compiler:          gcc version 4.1.2 20070302 (prerelease) (4.1.2-1mdv2007.1) 
OS:                Linux

The QtRuby tutorial at http://www.arachnoid.com/ruby/RubyGUIProject/index.html \
crashes (with segmentation fault). Fortunately, I found out what causes it: After \
debugging the program, I found out that it crashes when calling Qt::GridLayout.new. \
From QtRuby logs I found out that this function doesn't exist (has no "candidates"). \
(If needed, I may provide these logs.) I tried to recompile QtRuby from source \
(instead of using the RPM) and traced the bug to its source: while configure-ing, \
Smoke defined QT_NO_LAYOUTS. It was set by smoke/qt/qtguess.pl (auto-generated from \
qtguess.pl.in). The script tried to compile this program:

#include <QtGui/qlayout.h>
#include <QtCore/qfeatures.h>

class QFoo: public QLayout
{
public:
QFoo() {};
~QFoo() {};
void addItem( QLayoutItem * ) { };
QSize sizeHint() const { return QSize(); }
void setGeometry( const QRect & ) { };
QLayoutItem* itemAt(int) const {return (QLayoutItem*) NULL;}
QLayoutItem* takeAt(int) {return (QLayoutItem*) NULL;}
int QFoo::count() const {return 0;}     <---- this is line 14
};

int main( int argc, char ** argv)
{
QFoo foo;
return 0;
}
(EOF)

Compilation failed with this error:

28982-qtguess.cpp:14: error: extra qualification 'QFoo::' on member 'count'

Obviously, this is just an error in the testing program and Qt layouts work as they \
should, so QT_NO_LAYOUTS shouldn't be defined.

I think that maybe there are two separate bugs: 1. qtguess.pl(.in) has a wrong \
testing program for QT_NO_LAYOUTS, 2. QtRuby reacts with segmentation fault when a \
non-existent function (or just constructor?) is called. \
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