How to find Version of Qt?

Question

How do I know which version of Qt I am using? When I open Qt Creator it shows \"Welcome to Qt Creator 2.3\". In the build setting, however, it shows Qt Version 4.7.1.

Answer 1

You are using Qt version 4.7.1, because that is the version of the qmake. You can also from shell type qmake -v to get it. The other version, namely 2.3, is the version of Qt Creator, not of Qt

Answer 2

For qt4 :

QT_SELECT=4 qmake -v

for qt5 :

QT_SELECT=5 qmake -v

Answer 3

All the version info is in PyQt5.Qt:

import inspect
from PyQt5 import Qt

vers = ['%s = %s' % (k,v) for k,v in vars(Qt).items() if k.lower().find('version') >= 0 and not inspect.isbuiltin(v)]
print('\n'.join(sorted(vers)))

prints

PYQT_VERSION = 328193
PYQT_VERSION_STR = 5.2.1
QOpenGLVersionProfile = <class 'PyQt5.QtGui.QOpenGLVersionProfile'>
QT_VERSION = 328192
QT_VERSION_STR = 5.2.0
qVersion = <built-in function qVersion>
qWebKitMajorVersion = <built-in function qWebKitMajorVersion>
qWebKitMinorVersion = <built-in function qWebKitMinorVersion>
qWebKitVersion = <built-in function qWebKitVersion>

The functions can be called too:

>>> vers = ['%s = %s' % (k,v()) for k,v in vars(Qt).items() if k.lower().find('version') >= 0 and inspect.isbuiltin(v)]
>>> print('\n'.join(sorted(vers)))
qVersion = 5.2.0
qWebKitMajorVersion = 538
qWebKitMinorVersion = 1
qWebKitVersion = 538.1

Answer 4

You can use qmake -query QT_VERSION:

➜  ~ qmake -query QT_VERSION
4.8.7

➜  ~ Qt/5.15.0/gcc_64/bin/qmake -query QT_VERSION
5.15.0

➜  ~ qt-6.0.0/bin/qmake -query QT_VERSION
6.0.0

Answer 5

Starting with Qt 5.3 you can use:

qtdiag

This prints a bunch of useful information. The first line includes the version:

Qt 5.5.1 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 5.3.1 20160407) on "xcb" 

Answer 6

qmake-qt5 --version

or

qmake --version