From kdevelop-bugs  Sat Oct 28 20:53:37 2006
From: Tom Bech <tom.bech () broadpark ! no>
Date: Sat, 28 Oct 2006 20:53:37 +0000
To: kdevelop-bugs
Subject: [Bug 136436] New: KDevelop 3.4 svn - crash in
Message-Id: <20061028225335.136436.tom.bech () broadpark ! no>
X-MARC-Message: https://marc.info/?l=kdevelop-bugs&m=118306955410666

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http://bugs.kde.org/show_bug.cgi?id=136436         
           Summary: KDevelop 3.4 svn - crash in
                    QMake::AssignmentAST::writeBack when editing project
                    settings
           Product: kdevelop
           Version: unspecified
          Platform: SuSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: general
        AssignedTo: kdevelop-bugs kdevelop org
        ReportedBy: tom.bech broadpark no


Version:           3.4 (using KDE KDE 3.5.4)
Installed from:    SuSE RPMs
Compiler:          gcc 4.1.0 
OS:                Linux

Using KDevelop 3.4 fresh from SVN as of 28.10.2006 on a KDE 3.5.4 on a Suse 10.1 box. I'm writing a small Qt4 application to, well, get to know qt4 :)

I'm experiencing a lot of crashes involving QMake::AssignmentAST::writeBack() when using the qmake manager. I made the project using the new project wizard for a basic qt4 application with a gui.

The crash is sometimes when adding files or creating new files, but it's easiest to reproduce by for example trying to edit project settings (e.g. right clicking on "src" and selecing "settings") - this will result in the following traceback when accepting the changes (for instance setting debug mode on tab 2):

[KCrash handler]
#6  0xb6a5f7d7 in QString::operator+= () from /usr/lib/qt3/lib/libqt-mt.so.3
#7  0xb5425674 in QMake::AssignmentAST::writeBack ()
   from /opt/kde3/lib/libkdevqmakeparser.so.0
#8  0xb5424906 in QMake::AST::writeBack ()
   from /opt/kde3/lib/libkdevqmakeparser.so.0
#9  0xb5424d8c in QMake::ProjectAST::writeBack ()
   from /opt/kde3/lib/libkdevqmakeparser.so.0
#10 0xb5267d2a in Scope::saveToFile ()
   from /opt/kde3/lib/kde3/libkdevtrollproject.so
#11 0xb522a607 in ProjectConfigurationDlg::apply ()
   from /opt/kde3/lib/kde3/libkdevtrollproject.so
#12 0xb522a815 in ProjectConfigurationDlg::accept ()
   from /opt/kde3/lib/kde3/libkdevtrollproject.so
#13 0xb6aeb152 in QDialog::qt_invoke () from /usr/lib/qt3/lib/libqt-mt.so.3
#14 0xb52141d3 in ProjectConfigurationDlgBase::qt_invoke ()
   from /opt/kde3/lib/kde3/libkdevtrollproject.so
[snip]

I've had a quick look at the function found in buildtools/lib/parsers/qmake/qmakeast.cpp but couldn't immediate spot any obvious wrong code.

The crash results in losing the whole project file every time (it's apparently overwritten). Perhaps it would be a better idea to write back to a temp file and replace the project file if the writeback operation is successful?

Thanks for your great work on KDevelop, by the way :)