Why qt6 would look for external libQt6Core.so.6 rather than its own built libQt6Core.so by default?

jiapei100

Hi, all:

I'm trying to build Qt6 from source under Ubuntu 22.04, with gcc

➜  build lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 22.04.2 LTS
Release:	22.04
Codename:	jammy
➜  build gcc --version
gcc (Ubuntu 11.3.0-1ubuntu1~22.04.1) 11.3.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

But, got the following ERROR messages:

[ 15%] Automatic QML type registration for target Qml
cd /opt/qt/qt-everywhere-src-6.5.1/build/qtdeclarative/src/qml && ../../../qtbase/libexec/qmltyperegistrar --generate-qmltypes=/opt/qt/qt-everywhere-src-6.5.1/build/qtbase/qml/QtQml/Base/plugins.qmltypes --import-name=QtQml.Base --major-version=6 --minor-version=5 --follow-foreign-versioning @/opt/qt/qt-everywhere-src-6.5.1/build/qtdeclarative/src/qml/qmltypes/Qml_foreign_types.txt --private-includes -o /opt/qt/qt-everywhere-src-6.5.1/build/qtdeclarative/src/qml/qml_qmltyperegistrations.cpp /opt/qt/qt-everywhere-src-6.5.1/build/qtdeclarative/src/qml/meta_types/qt6qml_release_metatypes.json
../../../qtbase/libexec/qmltyperegistrar: /usr/lib/x86_64-linux-gnu/libQt6Core.so.6: version `Qt_6.5' not found (required by ../../../qtbase/libexec/qmltyperegistrar)
make[2]: *** [qtdeclarative/src/qml/CMakeFiles/Qml.dir/build.make:90: qtdeclarative/src/qml/qml_qmltyperegistrations.cpp] Error 1
make[2]: Leaving directory '/opt/qt/qt-everywhere-src-6.5.1/build'
make[1]: *** [CMakeFiles/Makefile2:33713: qtdeclarative/src/qml/CMakeFiles/Qml.dir/all] Error 2
make[1]: Leaving directory '/opt/qt/qt-everywhere-src-6.5.1/build'
make: *** [Makefile:149: all] Error 2

➜  build find . -depth -iname "*.so" | grep Core
./qtbase/lib/libQt6Core5Compat.so
./qtbase/lib/libQt6QmlCore.so
./qtbase/lib/libQt6Core.so
./qtbase/lib/libQt63DCore.so
./qtbase/qml/QtCore/libqtqmlcoreplugin.so
./qtbase/qml/Qt3D/Core/libquick3dcoreplugin.so

Don't know if anywhere suggested to look for /usr/lib/x86_64-linux-gnu/libQt6Core.so.6 FIRST before local ./qtbase/lib/libQt6Core.so ?

sierdzio

@jiapei100 what is your configure line?

JoeCFD

@jiapei100 also do not build Qt under /opt/ since you do not want to use sudo to build it. Build Qt anywhere under your $HOME and install it under /opt

jiapei100

@JoeCFD Thank you.. I've already chmod my /opt folder .. That's not this issue. But, thanks anyway..

jiapei100

@sierdzio Hi, I have my CMakeCache.txt pasted here.

Can you help to take a look ? Thank you

sierdzio

@jiapei100 I don't even know what to look for there. I do know what to do with a configure call.

JoeCFD

@jiapei100 check here out about configure settings:
http://bin.ceicer.com/qt/Linux/

Just curious: why do you want to build 6.5.1 on Ubuntu 22.04? You can simply install it.