could not find qtplatfom plugin eglfs

Asha

@jsulm I followed the below document ,please go through this one, even he also done with debian,created sysroot....

here is the link https://forum.qt.io/topic/106912/how-to-copy-cross-compiled-qt-binaries-from-one-computer-to-another/13 in the post 13...click here you will get a one pdf(I followed that one) but he did with vnc plugin(export done vnc only),even i also have that vnc plugin and i tried (exported also)but getting the same issue....

I am very new to this,(if i asked any foolish questions then sorry)

Asha

Hi,

I connected ssh,via ssh debian@192.168.7.2

after this,I am executing the executable

./example platform=vnc

The result is QVncServer created on port 5900

After this blank screen is showing...

Any suggestions about this....

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