could not find qtplatfom plugin eglfs

Asha

Hi,
I tried ,creation and execution of application through command prompt only,

created directory

mkdir qws

cd qws

vi qws.pro
TEMPLET=app
SOURCES=main.cpp

vi main.cpp
#include<QApplication>
#include<QPushButton>
int main(int argc,char** argv)
{
QApplication app(argc,argv);
QPushButton btn("HI");
btn.show();
btn.showMaximized();
}

After this gave the command

qmake

the output is:

qmake:could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/make : No such file or directory

I am fully confused what going,what is the mistake, i cross compiled the qt5 but its showing about qt4....any ideas ?please

SGaist

Always use the full path to the qmake version you want to use.

Note that your cross-compiles Qt will have qmake built for the host and not the target.

Asha

@SGaist

Good morning..

yes Iused the full path,

what ever I build and cross compiled ,i am able to run examples in vnc platform...

but i want to build and cross compile qt with eglfs platform,for that any links?....

Asha

@SGaist Hi,

I created the drectory,and created the .cpp and .pro file after that tring for qmke but getting "qmake: could not exec '/usr/lib/x86_64-Linux-gnu/qt4/bin/make': No such file or directory.."

mkdir sample
cd sample
vi sample.cpp
vi sample.pro
qmake /home/beagle/Qt5/bin/qmake

Any suggestions please?.......

jsulm

@Asha said in could not find qtplatfom plugin eglfs:

Any suggestions please?.......

"qmake /home/beagle/Qt5/bin/qmake" - what is this line supposed to be?!
It should be

/home/beagle/Qt5/bin/qmake

Asha

@jsulm yes,i gave this one /home/beagle/Qt5/bin/qmake

After this i got the makefile,
the gave the make

after this make getting the error

arm-linux-gnueabihf-g++: error : .o No such file or directory
Makefile:141: recipe for target 'sample' failed
make: ***[sample] Error 1

when i list the files ,i got the sample.o file

so I copied that obj file in my board using scp,

And executing that sample.o file in board,
./sample.o platform=vnc

getting the error:

-bash: ./sample.o: cannot execute binary file: EXec format error

jsulm

@Asha You can't execute *.o files!
Those needs to be linked together to an executable.

"arm-linux-gnueabihf-g++: error : .o - please delete everything in your build directory, run qmake again and then build (call make).
Also this error message looks strange - there should be actual file name in front of .o

Asha

@jsulm

Those needs to be linked together to an executable.but i am not getting the executable file...

getting this
arm-linux-gnueabihf-g++: error : .o No such file or directory
Makefile:141: recipe for target 'sample' failed
make: ***[sample] Error 1

.o - please delete everything in your build directory,

I am not understood the above line,delete everything in build directory means,I need to delete the Qt5 directory files and directories?

jsulm

@Asha said in could not find qtplatfom plugin eglfs:

I need to delete the Qt5 directory files and directories?

No.
What I mean is: delete all build artefacts from previous builds (like *.o files, Makefiles).

Asha

@jsulm I deleted the all makefiles and .o files now tring to execute sample.o file but getting the -bash: ./sample.o:cannot execute binary file: Exec format error..

"You can't execute *.o files!",Please suggest me where i need to link that .o file(I am not getting any executable file)..

jsulm

@Asha said in could not find qtplatfom plugin eglfs:

"You can't execute *.o files!",Please suggest me where i need to link that .o file(I am not getting any executable file)..

You just need to build again!
"I am not getting any executable file" - yes, because your build fails.
Before I wrote: please delete everything in your build directory, run qmake again and then build (call make).
So again: please run qmake and build.

Asha

@jsulm

Hi,

I done once again qmake and make,

After make ,I got

undefined reference to 'main'
collect2: error :ld returned 1 exit status
Makefile:137: recipe for target 'sample 'failed'
make: *** [sample] Error 1

After listing the files,the result is

Makefile
.qmake.stash
sample.cpp
sample.pro

I am not getting ,what is the problem....

jsulm

@Asha Does your sample.cpp contain main() function?

Asha

@jsulm
yes,

#include <QCoreApplication>
#include <QString>
#include <QFile>
#include <QDir>
#include <QTextStream>
#include <QDebug>
int main(int argc, char *argv[])
{
QCoreApplication app(argc, argv);
// prepare the message
QString message("Hello World!");
// prepare a file in the users home directory named out.txt
QFile file(QDir::home().absoluteFilePath("out.txt"));
// try to open the file in write mode
if(!file.open(QIODevice::WriteOnly)) {
qWarning() << "Can not open file with write access";
return -1;
}
// as we handle text we need to use proper text codecs
QTextStream stream(&file);
// write message to file via the text stream
stream << message;
return 0;
}
~

jsulm

@Asha Please show your pro file

Asha

@jsulm here is my .pro file

Qt += core gui

sources += \ sample.cpp

target.path=/home/debian/Qt5
INSTALLS +=target

jsulm

@Asha said in could not find qtplatfom plugin eglfs:

\ sample.cpp

why do you have backslash in front of sample.cpp?
"Qt += core gui" must be "QT += core gui"

[edit: Fixed variable name SGaist]

Asha

@jsulm as you said i followed but getting the same result,

please say me tje .pro file for that .cpp file

SGaist

You don't even need to modify the QT variable content based on your code. However, as @jsulm wrote, your SOURCES line is wrong.

In any case it should rather be

QT += core gui
SOURCES += sample.cpp

Casing is important.