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Subject: Installation and compilation problems for QtCore4, Ubuntu 16.10, Perl version 5.24.1
I tried to Install QtCore4 on Ubuntu 16.10, perl version 5.24.1: sudo apt-get install cmake sudo apt-get install qt4-designer libqtgui4-perl cpan -g QtCore4 bunzip2 Qt4-0.99.0.tar.bz2 tar xvf Qt4-0.99.0.tar cd Qt4-0.99.0 perl Makefile.PL make VERBOSE=1 Now make reports several problems. First error message is about implicitly deleted virtual destructors, see: It seems like these errors come from generated .cpp files (smokegen). I think I managed to fix these errors in the generated files by manually adding virtual destructors to smokeqt/qtdbus/x_1.cpp:1595 smokeqt/qtgui/x_3.cpp:4024 smokeqt/qtgui/x_13.cpp:3572 smokeqt/qthelp/x_1.cpp:873 but obviously it would be much better to fix these error at the core (i.e. not fixing generated files, but the generator (smokegen ??)) or add some compiler option to ignore the missing destructors?? After fixing the four generated files, the next compile error (from cmake) occured in qtcore/src/util.cpp:2234: /home/hakon/Qt4-0.99.0/qtcore/src/util.cpp: In function ‘void XS_AUTOLOAD(CV*)’: /home/hakon/Qt4-0.99.0/qtcore/src/util.cpp:2234:59: error: cannot convert ‘bool’ to ‘void*’ in initialization static smokeperl_object nothis = { 0, 0, 0, false }; This was "fixed" by changing "false" to 0 in the last item of structure initializer. After fixing the problem in qtcore/src/util.cpp, the next error reported from cmake occured when trying to link /usr/bin/c++ -fPIC -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong \ -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O3 -DNDEBUG \ -shared -Wl,-soname, -o ../../blib/arch/auto/QtCore4/ \ CMakeFiles/perlqtcore4.dir/binding.cpp.o \ CMakeFiles/perlqtcore4.dir/handlers.cpp.o \ CMakeFiles/perlqtcore4.dir/marshall_types.cpp.o \ CMakeFiles/perlqtcore4.dir/util.cpp.o \ CMakeFiles/perlqtcore4.dir/QtCore4.c.o \ -lQtCore -lQtGui -lQtNetwork \ /home/hakon/perlbrew/perls/perl-5.24.1/lib/5.24.1/x86_64-linux/CORE/libperl.a \ ../../smokeqt/qtgui/ \ ../../smokeqt/qtnetwork/ \ -lpthread -lnsl -ldl -lm -lcrypt -lutil -lc -lQtGui -lQtNetwork \ ../../smokeqt/qtcore/ -lQtCore \ ../../smokegen/bin/ \ -Wl,-rpath,/home/hakon/Qt4-0.99.0/smokeqt/qtgui:/home/hakon/Qt4-0.99.0/smokeqt/qtnetwork:/home/hakon/Qt4-0.99.0/smokeqt/qtcore:/home/hakon/Qt4-0.99.0/smokegen/bin: /usr/bin/ld: /home/hakon/perlbrew/perls/perl-5.24.1/lib/5.24.1/x86_64-linux/CORE/libperl.a(toke.o): relocation R_X86_64_PC32 against symbol `PL_curcop' can not be used when making a shared object; recompile with -fPIC /usr/bin/ld: final link failed: Bad value collect2: error: ld returned 1 exit status Apparently toke.o in libperl.a was compiled with -fPIC in earlier Perl releases, but for my perl ( version 5.24.1 ) toke.o was not compiled with -fPIC. (I installed my perl using perlbrew). This error was "fixed" by installing a new perl with ccflags=-fPIC perlbrew install perl-5.24.1 --as perl-5.24.1-PIC -Accflags=-fPIC See also: But linker error should probably be more correctly fixed by manually compiling "toke.c" with -fPIC (i.e. we should check if the files in libperl.a has been compiled with -fPIC (which they are not for newer versions of Perl) and if not, recompile them with -fPIC)?? Now the make (cmake) finally completed successfully, and I could run make install and then I created a simple test program ( use strict; use warnings; use QtCore4; use QtGui4; my $app = Qt::Application(\@ARGV); my $button = Qt::PushButton( 'Hello, World!', undef); $button->show(); exit $app->exec(); however several errors still occured when trying to run this program. First: Can't use 'defined(@array)' (Maybe you should just omit the defined()?) at /home/hakon/perlbrew/perls/perl-5.24.1-PIC/lib/site_perl/5.24.1/x86_64-linux/ line 1420. Compilation failed in require at ./ line 3. See also: The defined(@array) has been deprecated for a long time, and for recent perls ( > 5.22 ) the deprecation warning has become fatal. See also this error was fixed by changing the following lines (starting at line 1420 in @{$classinfos} = () if !defined @{$classinfos}; @{$signals} = () if !defined @{$signals}; @{$slots} = () if !defined @{$slots}; to $classinfos ||= []; $signals ||= []; $slots ||= []; After fixing the defined(@array) error, the next error occured in, line 25: "SvREFCNT_inc" is not exported by the Devel::Peek module Can't continue after import errors at /home/hakon/perlbrew/perls/perl-5.24.1-PIC/lib/site_perl/5.24.1/x86_64-linux/ line 25. BEGIN failed--compilation aborted at /home/hakon/perlbrew/perls/perl-5.24.1-PIC/lib/site_perl/5.24.1/x86_64-linux/ line 25. Compilation failed in require at ./ line 4. BEGIN failed--compilation aborted at ./ line 4. This appears to be a bug in Devel::Peek. It used to export SvREFCNT_inc, and the docs still claims it does, but it doesn't anymore. You can work around this by replacing: use Devel::Peek qw( SvREFCNT_inc ); with use Devel::Peek qw( ); BEGIN { *SvREFCNT_inc = \&Devel::Peek::SvREFCNT_inc; } at line 25. After fixing the export error from Devel::Peek, the test program runs and shows the "Hello world" window :) However it still issues some warnings: Subroutine Qt::GlobalSpace::_UTOLOAD redefined at /home/hakon/perlbrew/perls/perl-5.24.1-PIC/lib/site_perl/5.24.1/x86_64-linux/ line 1305. Subroutine Qt::GlobalSpace::_UTOLOAD redefined at /home/hakon/perlbrew/perls/perl-5.24.1-PIC/lib/site_perl/5.24.1/x86_64-linux/ line 1305. Subroutine Qt::Widget::_UTOLOAD redefined at /home/hakon/perlbrew/perls/perl-5.24.1-PIC/lib/site_perl/5.24.1/x86_64-linux/ line 1305. Subroutine Qt::Widget::_UTOLOAD redefined at /home/hakon/perlbrew/perls/perl-5.24.1-PIC/lib/site_perl/5.24.1/x86_64-linux/ line 1305. I have not looked into these warnings yet.. Hope this bug report can help bring QtCore4 up-to-date and a useful Perl module in the future. - Håkon Hægland

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