how to solve these error when building from command line

[SGaist]

From the looks of it, you are using your distribution provided Qt on the command line and you did not install all the development packages required.

When on the command line, use the full path to the qmake executable that you want to use to build your application.

[rajel052]

Hii, @SGaist how to fix these error

how to install development package

please help me

[SGaist]

Check your distribution package manager.

Or since you have installed Qt using the online installer: use the full path to the qmake executable that your can find in the bin folder of the Qt version you installed with the online installer.

[Christian Ehrlicher]

@rajel052 said in how to solve these error when building from command line:

1891 | qDebug() << Qt::dec;

Also this is wrong - Qt has no function dec, but std has: std::dec

[mrjj]

@Christian-Ehrlicher
Actually

and
qDebug() << Qt::dec;

compiles and runs. o.O
(Qt 5.15)

[Christian Ehrlicher]

@mrjj said in how to solve these error when building from command line:

qDebug() << Qt::dec;

Then the include for QTextStream is missing. :)

[mrjj]

@Christian-Ehrlicher
Just saw it suggest it under
qmuparserbase.cpp:1891:21: note: suggested alternatives:
/usr/include/x86_64-linux-gnu/qt5/QtCore/qtextstream.h:238:28: note: ‘dec’
238 | Q_CORE_EXPORT QTextStream &dec(QTextStream &s);

So yeah it could be that simple :)

[rajel052]

Hi , Not Solved yet
how to build on 5.12.8 distribution provided
how to install required development packages
how to use full path to the qmake executable.

[ChrisW67]

how to build on 5.12.8 distribution provided

You have not told us who provided the distribution

how to install required development packages

That depends on the distribution.
For Ubuntu 20.04 you can see the development packages here.

how to use full path to the qmake executable.

$ locate qmake
    # Select one of the paths to a qmake executable that is shown on your system
    # Use that
    # Examples:
$ /usr/bin/qmake
$ /home/rajel052/Qt/.../bin/qmake

[rajel052]

This post is deleted!

[rajel052]

@ChrisW67
$ qmake /home/rajel052/Qt/5.15.2/gcc_64/bin/qmake
$ make
g++ -Wl,-O1 -o qmake /usr/lib/x86_64-linux-gnu/libQt5Gui.so /usr/lib/x86_64-linux-gnu/libQt5Core.so /usr/lib/x86_64-linux-gnu/libGL.so -lpthread
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/Scrt1.o: in function _start': (.text+0x24): undefined reference to main'
collect2: error: ld returned 1 exit status
make: *** [Makefile:147: qmake] Error 1

[jsulm]

@rajel052 said in how to solve these error when building from command line:

qmake /home/rajel052/Qt/5.15.2/gcc_64/bin/qmake

What is this?! You are supposed to call qmake using absolute path instead of just qmake:

/home/rajel052/Qt/5.15.2/gcc_64/bin/qmake PATH_TO_YOUR_PRO_FILE

Also, delete the content of your build folder before calling qmake.

[rajel052]

thank you @ChrisW67