Can i use Libtorch library on QT Creator with qmake?

mesut.toruk

I need to integrate my Torch project to QT GUI? But i can not use Torch Libraries on QT. I got some errors like below.(OS: Windows10)

libtorch\include\torch\csrc\jit\ir.h:1077: error: function 'torch::jit::Value* torch::jit::Graph::insertGetAttr(torch::jit::Value*, const string&)' definition is marked dllimport
TORCH_API Value* insertGetAttr(Value* obj, const std::string& field)```

I added libtorch to .pro file:

QMAKE_CXXFLAGS += -DGLIBCXX_USE_CXX11_ABI=0

INCLUDEPATH += "$$PWD\libtorch\include"
INCLUDEPATH += "$$PWD\libtorch\include\torch\csrc\api\include"

LIBS += -L$$PWD/libtorch/lib
LIBS += -ltorch -lc10

I also create new issue in this post: [https://github.com/pytorch/pytorch/issues/22792] However, i could not solve my problem.

SGaist

Hi and welcome to devnet,

Did you follow the link provided in your GitHub issue ?

It seems that "CONFIG += no_keywords" added to your .pro file should do the trick.

[edit: Fixed the .pro file line SGaist]

mrjj

Hi
~~Its seems it's not available for Windows with mingw/visual studio. (c++)~~
vs could work as @SGaist found. with workaround.
https://github.com/pytorch/pytorch/issues/19405
However, it being a python thing, could you not use it natively with Qt for Python ?
https://www.qt.io/qt-for-python

mesut.toruk

new .pro file:
QMAKE_CXXFLAGS += -DGLIBCXX_USE_CXX11_ABI=0
CONFIG += no_keywords

INCLUDEPATH += "$$PWD\libtorch\include"
INCLUDEPATH += "$$PWD\libtorch\include\torch\csrc\api\include"

LIBS += -L$$PWD/libtorch/lib
LIBS += -ltorch -lc10

and i added to code:

#undef slots
#include "torch/torch.h"
#include "torch/script.h"
#def slots Q_SLOTS

It does not work. It gives same error.

SGaist

What version of Qt are you using ?
What compiler are you using ?
Which version of the compiler ?

Also, use forward slashes for paths. Qt handles the transformation to native path and it will avoid escaping issues.

mesut.toruk

QT Creator 4.8.2
MinGW 7.3.0 64 bit

I adjusted forward slashes for paths.

jsulm

@mesut.toruk said in Can i use Libtorch library on QT Creator with qmake?:

QT Creator 4.8.2

This is not Qt version...

"I adjusted forward slashes for paths." - and rerun qmake and rebuild?

SGaist

Might be silly question but do you currently have a MinGW build of lib torch ?

mesut.toruk

QT 5.12.2.
No, i do not have MinGW build of lib torch. Then this post, i looked for it. It seems hard. They recommend using MSVC. I installed Visual Studio 2017 and tried to set compiler. I guess, I couldn't do it right. How can i add MSVC 2017 to Tools>Options>Kits>Compilers?

My error:

13:21:15: Could not determine which "make" command to run. Check the "make" step in the build configuration.
Error while building/deploying project t2 (kit: Desktop Qt 5.12.2 MSVC2017 64bit)
When executing step "qmake"

aha_1980

@mesut.toruk said in Can i use Libtorch library on QT Creator with qmake?:

How can i add MSVC 2017 to Tools>Options>Kits>Compilers?

You cannot. Creator auto-detects it. Where did you install Visual Studio 2017? Did you install the C++ compiler too?

Regards

mesut.toruk

@aha_1980
I installed C:/Program Files/Microsoft Visual Studio. I also installed C++ compiler. It is "cl.exe" in Visual Studio.

aha_1980

Hi @mesut.toruk,

I installed C:/Program Files/Microsoft Visual Studio. I also installed C++ compiler. It is "cl.exe" in Visual Studio.

And the compiler is not auto-detected in Tools > Options > Kits > Compilers ?

mesut.toruk

@aha_1980
No it is not. Should Qt install MSVC? While i install QT, i marked MSVC. But there is no MSVC in C:\Qt\Tools. However, there is qmake in C:\Qt\5.12.2\msvc2017\bin. I installed externally Visual Studio and tried to add it. It gives error.

jsulm

@mesut.toruk said in Can i use Libtorch library on QT Creator with qmake?:

Should Qt install MSVC

No, QtCreator should auto detect Microsoft C++ compiler. Can you show your compiler tab?
Which Visual Studio version did you install?

mesut.toruk

@jsulm
I installed Visual Studio 2017 and Visual Studio 2019.

0_1563786116733_Ekran Alıntısı.PNG

jsulm

@mesut.toruk The Microsoft compilers were not auto detected.
Did you install the C++ parts of Visual Studio (those are not automatically installed)?
If so, then try to deinstall QtCreator and install it again.