:-1: error: cannot find -lPythonQt-Qt5-Python3.8_d

devillIsHeree

I am trying to use PythonQt in my Qt c++ application to embed python script in my application, I have build the PythonQt successfully in my system and also tested all it's examples and they all are working perfectly but when I tried to use it with my application it gives me following error.

:-1: error: cannot find -lPythonQt-Qt5-Python3.8_d

JonB

@devillIsHeree said in :-1: error: cannot find -lPythonQt-Qt5-Python3.8_d:

-lPythonQt-Qt5-Python3.8_d

Purely at a guess, is that _d suffix for a debug library and you don't have that? Have a search on your disk, do you have any similarly-named library at all?

devillIsHeree

What do you mean by similar named library? @JonB

JonB

@devillIsHeree
Any file at all with PythonQt-Qt5-Python3.8 (without the _d) in it, just to see what you have, e.g.

Linux: locate 'PythonQt-Qt5-Python3.8'
Windows: dir/s/b C:\ | findstr "PythonQt-Qt5-Python3.8"

devillIsHeree

@JonB I have ubuntu, I have run your provided command, It is showing me those results

/usr/lib/libPythonQt-Qt5-Python3.8.so
/usr/lib/libPythonQt-Qt5-Python3.8.so.3
/usr/lib/libPythonQt-Qt5-Python3.8.so.3.2
/usr/lib/libPythonQt-Qt5-Python3.8.so.3.2.0

JonB

@devillIsHeree
Which is what I kind of wondered might show up. But as I said your error message, assuming you copy/pasted it, reads:

-lPythonQt-Qt5-Python3.8_d

If it read -lPythonQt-Qt5-Python3.8 it would link against those libraries you do have. But it has that trailing _d, so will not. Which I suspect is something to do with wanting a debug version of the library. Which you don't have.

So have a look at wherever that line comes from. Is it supposed to be debug? Are you supposed to download/install a debug version of this PythonQt library?

devillIsHeree

@JonB Actually I had install PythonQt to use the python embedding in Qt c++, This line is coming from the file
PythonQt.prf. This is the link to that file https://github.com/MeVisLab/pythonqt/blob/master/build/PythonQt.prf

@JonB and I just watnt o use that PythonQt in my code, It is PythonQt only which wanted to have that debug file I suppose but I don't know how to resolve this Please help

JonB

@devillIsHeree said in :-1: error: cannot find -lPythonQt-Qt5-Python3.8_d:

https://github.com/MeVisLab/pythonqt/blob/master/build/PythonQt.prf

Yes, and I see that has:

# check if debug or release
CONFIG(debug, debug|release) {
  DEBUG_EXT = _d 
} else {
  DEBUG_EXT = 
}
...
unix: LIBS += -L$$DESTDIR/../lib -lPythonQt-Qt5-Python$${PYTHON_VERSION}$${DEBUG_EXT}

So either don't build for debug/get rid of using the DEBUG_EXT = _d under Linux at least, or somewhere (presumably) you can fetch (or build) the Linux debug libraries with _d on them.

devillIsHeree

Thanks @JonB sir, I just remove all the DEBUG_ext line
so now my all ```.prf.. files look like that

CONFIG(debug, debug|release) {
  DEBUG_EXT =
} else {
  DEBUG_EXT = 
}

and they're compiling well. Thanks for the help