QT 6?

[El Salvador]

I'm trying build Lazarus 2.3.0 (rev main-2_3-2831-gbff5a39d0b) with libqt6pas built by dbannon, but I have these errors:

Warning: linker: /usr/bin/ld: /usr/lib/x86_64-linux-gnu//libQt6Pas.so: undefined reference to `QWidget::addAction(QIcon const&, QString const&, QObject const*, char const*, Qt::ConnectionType)@Qt_6'
Warning: linker: /usr/bin/ld: /usr/lib/x86_64-linux-gnu//libQt6Pas.so: undefined reference to `qt_version_tag@Qt_6.3'
Warning: linker: /usr/bin/ld: /usr/lib/x86_64-linux-gnu//libQt6Pas.so: undefined reference to `QWidget::addAction(QString const&)@Qt_6'
Warning: linker: /usr/bin/ld: /usr/lib/x86_64-linux-gnu//libQt6Pas.so: undefined reference to `operator>>(QDataStream&, QTextCharFormat&)@Qt_6'
Warning: linker: /usr/bin/ld: /usr/lib/x86_64-linux-gnu//libQt6Pas.so: undefined reference to `QPolygon::setPoint(int, int, int)@Qt_6'
Warning: linker: /usr/bin/ld: /usr/lib/x86_64-linux-gnu//libQt6Pas.so: undefined reference to `QWidget::addAction(QIcon const&, QString const&)@Qt_6'
Warning: linker: /usr/bin/ld: /usr/lib/x86_64-linux-gnu//libQt6Pas.so: undefined reference to `QWidget::addAction(QString const&, QObject const*, char const*, Qt::ConnectionType)@Qt_6'
Warning: linker: /usr/bin/ld: /usr/lib/x86_64-linux-gnu//libQt6Pas.so: undefined reference to `operator<<(QDataStream&, QTextCharFormat const&)@Qt_6'
Warning: linker: /usr/bin/ld: /usr/lib/x86_64-linux-gnu//libQt6Pas.so: undefined reference to `QPointerEvent::point(long long)@Qt_6'
Warning: linker: /usr/bin/ld: /usr/lib/x86_64-linux-gnu//libQt6Pas.so: undefined reference to `QBitmap::~QBitmap()@Qt_6'
Warning: linker: /usr/bin/ld: /usr/lib/x86_64-linux-gnu//libQt6Pas.so: undefined reference to `QUrl::fromAce(QByteArray const&, QFlags<QUrl::AceProcessingOption>)@Qt_6'
Warning: linker: /usr/bin/ld: /usr/lib/x86_64-linux-gnu//libQt6Pas.so: undefined reference to `QUrl::toAce(QString const&, QFlags<QUrl::AceProcessingOption>)@Qt_6'

[zeljko]

Have you installed qt6-base-dev ? libQt6Pas should be build against Qt6-6.2.xx, not against 6.3.xx or superior.

[El Salvador]

I'm using libqt6pas built by dbannon (from deb package). Downloaded here https://github.com/davidbannon/libqt6pas/releases.

[zeljko]

What version of Qt6 libs is installed on your system ?

[El Salvador]

I'm using KDE Neon (base ubuntu 22.04). Qt6 libs are 6.2.4+dfsg-2ubuntu1 (see installed qt6 packages https://pastebin.com/2sb1ep2W ).

[zeljko]

It looks to me that dbannon built libQt6Pas against Qt6 6.3, so that's why it does not work. Hope he'll answer here soon.
This is suspicious in your errors: qt_version_tag@Qt_6.3

[dbannon]

Yes, I built libqt6pas against QT6 3.2, I did not realise there were still distros around using 6.2.4. Sorry, I really should have thought about that a bit better.

I will replace it asap, building now as I speak, will be a couple of hours...

Davo

[El Salvador]

I will replace it asap, building now as I speak, will be a couple of hours...

Thank you so much! As soon as I can, I'll try again.

[dbannon]

I will replace it asap, building now as I speak, will be a couple of hours...

Thank you so much! As soon as I can, I'll try again.

OK, all libraries updated. (Although the RPMs don't have a new package number, cannot workout how to do that in alien, sigh ...).

Sorry about that.

Davo

[El Salvador]

Good, it works! Thank you!

[AlexTP]

Ppl, I added useful info 'Troubleshooting on compiling on Linux' to the Wiki
https://wiki.freepascal.org/Qt6_Interface

[zeljko]

Thanks, actually it should say that it's build against qt 6.2 LTS, since there's no api changes in minor versions, only bugfixes.

[zeljko]

Btw, just tested qt6 on macos, it works like a charm

[theo]

Quick test on 6.4.0 (OpenSUSE Tumbleweed).

Screenshot here: https://www.lazarusforum.de/viewtopic.php?p=131537#p131537

Thank you!