lnk2019 with opencv treshold

[superdu]

hello every one,

I have a little problem with my qt project in qt creator. I try to use opencv but some function return to me error lnk 2019. its the case of imshow but as i dont really need it i dont care if that not work. But its also the case of other functions as threshold. Next to that im able to use Mat.

When i make a new qt project directly in visual studio I do not encounter this problem. i can use all functions of opencv.

I dont really know what is missing in my pro file:

INCLUDEPATH += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/include

LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_calib3d.lib"
LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_core.lib"
LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_dnn.lib"
LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_features2d.lib"
LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_flann.lib"
LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_highgui.lib"
LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_imgcodecs.lib"
LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_imgproc.lib"
LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_ml.lib"
LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_objdetect.lib"
LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_photo.lib"
LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_stitching.lib"
LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_video.lib"
LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_videoio.lib"

if someone already meet this kind of behavior i will be grateful to have the solution.

thank you in advance

[jsulm]

@superdu said in lnk2019 with opencv treshold:

I try to use opencv but some function return to me error lnk 2019

Please post the whole error

[superdu]

yes sorry:

image.obj:-1: erreur : LNK2019: external symbol unresolve "double __cdecl cv::threshold(class cv::debug_build_guard::_InputArray const &,class cv::debug_build_guard::_OutputArray const &,double,double,int)" (?threshold@cv@@YANAEBV_InputArray@debug_build_guard@1@AEBV_OutputArray@31@NNH@Z)reference in function "public: class QImage __cdecl Image::starsPosition(void)" (?starsPosition@Image@@QEAA?AVQImage@@XZ)

[SGaist]

Hi,

Might be a silly question but are you also using a 64 bit build of Qt ?

[superdu]

yes yes i use 64bit qt version

[SGaist]

@superdu said in lnk2019 with opencv treshold:

LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_calib3d.lib"

Usually it's rather written as:

LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/" -lopencv_calib3d

Can you test that ?

[superdu]

i originaly wrote it like that. That didn't work too.

[SGaist]

Is it the only symbol that fails the build ?

[superdu]

if i use imshow, i have this problem too. but i can use Mat. By the way i use msvc2019 (32 and 64). at the beginning i thought it was the problem. So i tried to compile it with msvc2015 but still the same problem... and i can use this functions on visual studio... the only difference is the IDE so i think i miss something but what...

[SGaist]

Just to make sure we are on the same base, can you describe your setup exactly ?
Which IDE are you using ?
Which exact compiler are you using ?
Which compiler was used for OpenCV and for Qt ?

[superdu]

for my project i use QtCreator but sometime, juste for test i use visual studio.
for openCV i used the package manager vcpkg but as that work on my vs i think its compile with msvc2019.
qt i just used the installer. i let here systems info from QtCreator:

{noformat}
Qt 5.15.2 (x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2019) on "windows"
OS: Windows 10 Version 2009 [winnt version 10.0.19042]

Architecture: x86_64; features: SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 AVX AVX2

Environment:
Qt5_DIR="D:\Qt\5.15.2\msvc2019_64"
QtMsBuild="C:\Users\antoi\AppData\Local\QtMsBuild"

Features: QT_NO_EXCEPTIONS

Library info:
PrefixPath: D:\Qt\Tools\QtCreator\bin
DocumentationPath: D:\Qt\Tools\QtCreator\bin\doc
HeadersPath: D:\Qt\Tools\QtCreator\bin\include
LibrariesPath: D:\Qt\Tools\QtCreator\bin
LibraryExecutablesPath: D:\Qt\Tools\QtCreator\bin\bin
BinariesPath: D:\Qt\Tools\QtCreator\bin
PluginsPath: D:\Qt\Tools\QtCreator\bin\plugins
ImportsPath: D:\Qt\Tools\QtCreator\bin\imports
Qml2ImportsPath: D:\Qt\Tools\QtCreator\bin\qml
ArchDataPath: D:\Qt\Tools\QtCreator\bin
DataPath: D:\Qt\Tools\QtCreator\bin
TranslationsPath: D:\Qt\Tools\QtCreator\bin\translations
ExamplesPath: D:\Qt\Tools\QtCreator\bin\examples
TestsPath: D:\Qt\Tools\QtCreator\bin\tests
SettingsPath:

Standard paths [... denote writable entry]:
DesktopLocation: "Desktop" C:\Users\antoi\OneDrive\Bureau
DocumentsLocation: "Documents" C:\Users\antoi\OneDrive\Documents
FontsLocation: "Fonts" C:\WINDOWS\Fonts
ApplicationsLocation: "Applications" C:\Users\antoi\AppData\Roaming\Microsoft\Windows\Start Menu\Programs
MusicLocation: "Music" C:\Users\antoi\Music
MoviesLocation: "Movies" C:\Users\antoi\Videos
PicturesLocation: "Pictures" C:\Users\antoi\OneDrive\Images
TempLocation: "Temporary Directory" C:\Users\antoi\AppData\Local\Temp
HomeLocation: "Home" C:\Users\antoi
AppLocalDataLocation: "Application Data" C:\Users\antoi\AppData\Local\QtProject\qtdiag C:\ProgramData\QtProject\qtdiag D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data D:\Qt\Tools\QtCreator\bin\data\QtProject\qtdiag
CacheLocation: "Cache" C:\Users\antoi\AppData\Local\QtProject\qtdiag\cache
GenericDataLocation: "Shared Data" C:\Users\antoi\AppData\Local C:\ProgramData D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data
RuntimeLocation: "Runtime" C:\Users\antoi
ConfigLocation: "Configuration" C:\Users\antoi\AppData\Local\QtProject\qtdiag C:\ProgramData\QtProject\qtdiag D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data D:\Qt\Tools\QtCreator\bin\data\QtProject\qtdiag
DownloadLocation: "Download" C:\Users\antoi\Downloads
GenericCacheLocation: "Shared Cache" C:\Users\antoi\AppData\Local\cache
GenericConfigLocation: "Shared Configuration" C:\Users\antoi\AppData\Local C:\ProgramData D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data
AppDataLocation: "Application Data" C:\Users\antoi\AppData\Roaming\QtProject\qtdiag C:\ProgramData\QtProject\qtdiag D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data D:\Qt\Tools\QtCreator\bin\data\QtProject\qtdiag
AppConfigLocation: "Application Configuration" C:\Users\antoi\AppData\Local\QtProject\qtdiag C:\ProgramData\QtProject\qtdiag D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data D:\Qt\Tools\QtCreator\bin\data\QtProject\qtdiag

File selectors (increasing order of precedence):
fr_FR windows winnt

Network:
Using "OpenSSL 1.1.1d 10 Sep 2019", version: 0x1010104f

Platform capabilities: ThreadedPixmaps OpenGL ThreadedOpenGL WindowMasks MultipleWindows ForeignWindows NonFullScreenWindows NativeWidgets WindowManagement RasterGLSurface AllGLFunctionsQueryable

Style hints:
mouseDoubleClickInterval: 500
mousePressAndHoldInterval: 800
startDragDistance: 10
startDragTime: 500
startDragVelocity: 0
keyboardInputInterval: 400
keyboardAutoRepeatRate: 32
cursorFlashTime: 1060
showIsFullScreen: 0
showIsMaximized: 0
passwordMaskDelay: 0
passwordMaskCharacter: U+25CF
fontSmoothingGamma: 1
useRtlExtensions: 0
setFocusOnTouchRelease: 0
tabFocusBehavior: Qt::TabFocusAllControls
singleClickActivation: 0

Additional style hints (QPlatformIntegration):
ReplayMousePressOutsidePopup: 1

Theme:
Platforms requested : windows
available : snap,flatpak,xdgdesktopportal
Styles requested : WindowsVista,Windows
available : windowsvista,Windows,Fusion
System font : "MS Shell Dlg 2" 8
Native file dialog

Fonts:
General font : "MS Shell Dlg 2" 8
Fixed font : "Courier New" 9
Title font : "MS Shell Dlg 2" 8
Smallest font: "MS Shell Dlg 2" 8

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QPalette::NoRole: #ff000000
QPalette::ToolTipBase: #ffffffdc
QPalette::ToolTipText: #ff000000
QPalette::PlaceholderText: #80000000

Screens: 1, High DPI scaling: inactive

0 "\.\DISPLAY1" Depth: 32 Primary: yes

Manufacturer:
Model:
Serial number:
Geometry: 1920x1080+0+0 Available: 1920x1040+0+0
Physical size: 382x215 mm Refresh: 144 Hz Power state: 0
Physical DPI: 127.665,127.591 Logical DPI: 96,96 Subpixel_None
DevicePixelRatio: 1 Pixel density: 1
Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0

Dynamic GL LibGL Vendor: NVIDIA Corporation
Renderer: NVIDIA GeForce RTX 2060/PCIe/SSE2
Version: 4.6.0 NVIDIA 466.63
Shading language: 4.60 NVIDIA
Format: Version: 4.6 Profile: 2 Swap behavior: 2 Buffer size (RGBA): 8,8,8,8 Depth buffer: 24 Stencil buffer: 8
Profile: None (QOpenGLFunctions_4_6)

Vulkan instance available
Supported instance extensions:
VK_KHR_device_group_creation, version 1
VK_KHR_display, version 23
VK_KHR_external_fence_capabilities, version 1
VK_KHR_external_memory_capabilities, version 1
VK_KHR_external_semaphore_capabilities, version 1
VK_KHR_get_display_properties2, version 1
VK_KHR_get_physical_device_properties2, version 2
VK_KHR_get_surface_capabilities2, version 1
VK_KHR_surface, version 25
VK_KHR_surface_protected_capabilities, version 1
VK_KHR_win32_surface, version 6
VK_EXT_debug_report, version 9
VK_EXT_debug_utils, version 2
VK_EXT_swapchain_colorspace, version 4
VK_NV_external_memory_capabilities, version 1
Supported layers:
VK_LAYER_NV_optimus, version 1, spec version 1.2.168, NVIDIA Optimus layer
VK_LAYER_VALVE_steam_overlay, version 1, spec version 1.2.136, Steam Overlay Layer
VK_LAYER_VALVE_steam_fossilize, version 1, spec version 1.2.136, Steam Pipeline Caching Layer
VK_LAYER_EOS_Overlay, version 1, spec version 1.2.136, Vulkan overlay layer for Epic Online Services
VK_LAYER_EOS_Overlay, version 1, spec version 1.2.136, Vulkan overlay layer for Epic Online Services
Available physical devices:
API version 1.2.168, vendor 0x10DE, device 0x1F11, NVIDIA GeForce RTX 2060, type 2, driver version 466.252.0

GPU #1:
Card name : NVIDIA GeForce RTX 2060
Driver Name : nvldumdx.dll
Driver Version : 27.21.14.6663
Vendor ID : 0x10DE
Device ID : 0x1F11
SubSys ID : 0x3FFD17AA
Revision ID : 0x00A1

Qt Rendering Hardware Interface supported backends:
OpenGL (with default QSurfaceFormat):
Min Texture Size: 1
Max Texture Size: 32768
Max Color Attachments: 8
Frames in Flight: 1
Uniform Buffer Alignment: 1
Supported MSAA sample counts: 1,2,4,8,16,32
Features:
- MultisampleTexture
v MultisampleRenderBuffer
- DebugMarkers
- Timestamps
v Instancing
- CustomInstanceStepRate
v PrimitiveRestart
v NonDynamicUniformBuffers
v NonFourAlignedEffectiveIndexBufferOffset
v NPOTTextureRepeat
- RedOrAlpha8IsRed
v ElementIndexUint
v Compute
v WideLines
v VertexShaderPointSize
v BaseVertex
- BaseInstance
v TriangleFanTopology
v ReadBackNonUniformBuffer
v ReadBackNonBaseMipLevel
Texture formats: RGBA8 BGRA8 R8 R16 RED_OR_ALPHA8 RGBA16F RGBA32F R16F R32F D16 D32F BC1 BC2 BC3 ETC2_RGB8 ETC2_RGB8A1 ETC2_RGBA8 ASTC_4x4 ASTC_5x4 ASTC_5x5 ASTC_6x5 ASTC_6x6 ASTC_8x5 ASTC_8x6 ASTC_8x8 ASTC_10x5 ASTC_10x6 ASTC_10x8 ASTC_10x10 ASTC_12x10 ASTC_12x12
Vulkan:
Min Texture Size: 1
Max Texture Size: 32768
Max Color Attachments: 8
Frames in Flight: 2
Uniform Buffer Alignment: 64
Supported MSAA sample counts: 1,2,4,8
Features:
v MultisampleTexture
v MultisampleRenderBuffer
- DebugMarkers
v Timestamps
v Instancing
- CustomInstanceStepRate
v PrimitiveRestart
v NonDynamicUniformBuffers
v NonFourAlignedEffectiveIndexBufferOffset
v NPOTTextureRepeat
v RedOrAlpha8IsRed
v ElementIndexUint
v Compute
v WideLines
v VertexShaderPointSize
v BaseVertex
v BaseInstance
v TriangleFanTopology
v ReadBackNonUniformBuffer
v ReadBackNonBaseMipLevel
Texture formats: RGBA8 BGRA8 R8 R16 RED_OR_ALPHA8 RGBA16F RGBA32F R16F R32F D16 D32F BC1 BC2 BC3 BC4 BC5 BC6H BC7
Direct3D 11:
Min Texture Size: 1
Max Texture Size: 16384
Max Color Attachments: 8
Frames in Flight: 1
Uniform Buffer Alignment: 256
Supported MSAA sample counts: 1,2,4,8
Features:
v MultisampleTexture
v MultisampleRenderBuffer
v DebugMarkers
v Timestamps
v Instancing
v CustomInstanceStepRate
v PrimitiveRestart
- NonDynamicUniformBuffers
v NonFourAlignedEffectiveIndexBufferOffset
v NPOTTextureRepeat
v RedOrAlpha8IsRed
v ElementIndexUint
v Compute
- WideLines
- VertexShaderPointSize
v BaseVertex
v BaseInstance
- TriangleFanTopology
v ReadBackNonUniformBuffer
v ReadBackNonBaseMipLevel
Texture formats: RGBA8 BGRA8 R8 R16 RED_OR_ALPHA8 RGBA16F RGBA32F R16F R32F D16 D32F BC1 BC2 BC3 BC4 BC5 BC6H BC7

Plugin information:

• Android 4.15.0
• AutoTest 4.15.0
  AutotoolsProjectManager 4.15.0
  BareMetal 4.15.0
• Bazaar 4.15.0
  Beautifier 4.15.0
• BinEditor 4.15.0
• Bookmarks 4.15.0
  Boot2Qt 4.15.0
• CMakeProjectManager 4.15.0
• CVS 4.15.0
• ClangCodeModel 4.15.0
  ClangFormat 4.15.0
• ClangTools 4.15.0
• ClassView 4.15.0
  ClearCase 4.15.0
• CodePaster 4.15.0
  CompilationDatabaseProjectManager 4.15.0
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• Core 4.15.0
• CppEditor 4.15.0
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• CtfVisualizer 4.15.0
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• Git 4.15.0
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• Help 4.15.0
• ImageViewer 4.15.0
• IncrediBuild 4.15.0
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• LanguageClient 4.15.0
• Macros 4.15.0
• Marketplace 4.15.0
  McuSupport 4.15.0
• Mercurial 4.15.0
  MesonProjectManager 4.15.0
• ModelEditor 4.15.0
  Nim 4.15.0
• PerfProfiler 4.15.0
  Perforce 4.15.0
• ProjectExplorer 4.15.0
• Python 4.15.0
• QbsProjectManager 4.15.0
• QmakeProjectManager 4.15.0
• QmlDesigner 4.15.0
• QmlJSEditor 4.15.0
• QmlJSTools 4.15.0
• QmlPreview 4.15.0
• QmlProfiler 4.15.0
• QmlProjectManager 4.15.0
• Qnx 4.15.0
• QtSupport 4.15.0
• RemoteLinux 4.15.0
• ResourceEditor 4.15.0
• ScxmlEditor 4.15.0
  SerialTerminal 4.15.0
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  StudioWelcome 4.15.0
• Subversion 4.15.0
• TaskList 4.15.0
• TextEditor 4.15.0
  Todo 4.15.0
• UpdateInfo 4.15.0
• Valgrind 4.15.0
• VcsBase 4.15.0
• WebAssembly 4.15.0
• Welcome 4.15.0
• WinRt 4.15.0

Qt Creator 4.15.0
Basé sur Qt 5.15.2 (MSVC 2019, 64 bit)
From revision 978f6caf1e
Built on May 4 2021 01:16:56

{noformat}

[SGaist]

Ok... nothing stands out as wrong.

Can you start from a default Qt project and just one OpenCV method there ?

It might be easier to debug your issue.

[superdu]

ok so here the code (thank you for your time by the way):

cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    Mat new_img = Mat::zeros(25, 25, CV_16U);
    Mat dest;

    threshold(new_img,dest,200,255,THRESH_BINARY | THRESH_OTSU);

}

MainWindow::~MainWindow()
{
    delete ui;
}

header

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/opencv.hpp>
#include "opencv2/imgproc.hpp"

using namespace cv;

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp \
    mainwindow.cpp

HEADERS += \
    mainwindow.h

FORMS += \
    mainwindow.ui

INCLUDEPATH += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/include

LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_calib3d.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_core.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_dnn.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_features2d.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_flann.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_highgui.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_imgcodecs.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_imgproc.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_ml.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_objdetect.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_photo.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_stitching.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_video.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_videoio.lib


TRANSLATIONS += \
    test_fr_FR.ts
CONFIG += lrelease
CONFIG += embed_translations

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

the code reproduce the problem for me:

mainwindow.obj:-1: erreur : LNK2019: symbole externe non r‚solu "double __cdecl cv::threshold(class cv::debug_build_guard::_InputArray const &,class cv::debug_build_guard::_OutputArray const &,double,double,int)" (?threshold@cv@@YANAEBV_InputArray@debug_build_guard@1@AEBV_OutputArray@31@NNH@Z) r‚f‚renc‚ dans la fonction "public: __cdecl MainWindow::MainWindow(class QWidget *)" (??0MainWindow@@QEAA@PEAVQWidget@@@Z)

[SGaist]

Does the build output show that the libraries are currently linked ?

By the way, you should move all your includes to the .cpp file. There's nothing in the header that uses OpenCV.

[superdu]

here the compile output:

21:18:53: Running steps for project test...
21:18:53: Configuration unchanged, skipping qmake step.
21:18:53: Starting: "D:\Qt\Tools\QtCreator\bin\jom.exe"
D:\Qt\Tools\QtCreator\bin\jom.exe -f Makefile.Debug
link /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /SUBSYSTEM:WINDOWS "/MANIFESTDEPENDENCY:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' publicKeyToken='6595b64144ccf1df' language='' processorArchitecture=''" /MANIFEST:embed /OUT:debug\test.exe @C:\Users\antoi\AppData\Local\Temp\test.exe.16732.0.jom
mainwindow.obj : error LNK2019: unresolved external symbol "double __cdecl cv::threshold(class cv::debug_build_guard::_InputArray const &,class cv::debug_build_guard::_OutputArray const &,double,double,int)" (?threshold@cv@@YANAEBV_InputArray@debug_build_guard@1@AEBV_OutputArray@31@NNH@Z) referenced in function "public: __cdecl MainWindow::MainWindow(class QWidget *)" (??0MainWindow@@QEAA@PEAVQWidget@@@Z)
debug\test.exe : fatal error LNK1120: 1 unresolved externals
jom: C:\Users\antoi\OneDrive\Documents\QTtest\build-test-Desktop_Qt_5_15_2_MSVC2019_64bit-Debug\Makefile.Debug [debug\test.exe] Error 1120
jom: C:\Users\antoi\OneDrive\Documents\QTtest\build-test-Desktop_Qt_5_15_2_MSVC2019_64bit-Debug\Makefile [debug] Error 2
21:18:53: The process "D:\Qt\Tools\QtCreator\bin\jom.exe" exited with code 2.
Error while building/deploying project test (kit: Desktop Qt 5.15.2 MSVC2019 64bit)
When executing step "Make"
21:18:53: Elapsed time: 00:00.

[SGaist]

Ok... does the Makefile contain any references to OpenCV ?

[superdu]

no indeed... they are no reference to opencv:

#############################################################################

Makefile for building: test

Generated by qmake (3.1) (Qt 5.15.2)

Project: ..\test\test.pro

Template: app

Command: D:\Qt\5.15.2\msvc2019_64\bin\qmake.exe -o Makefile ..\test\test.pro -spec win32-msvc "CONFIG+=debug" "CONFIG+=qml_debug"

#############################################################################

MAKEFILE = Makefile

EQ = =

first: debug
install: debug-install
uninstall: debug-uninstall
QMAKE = D:\Qt\5.15.2\msvc2019_64\bin\qmake.exe
DEL_FILE = del
CHK_DIR_EXISTS= if not exist
MKDIR = mkdir
COPY = copy /y
COPY_FILE = copy /y
COPY_DIR = xcopy /s /q /y /i
INSTALL_FILE = copy /y
INSTALL_PROGRAM = copy /y
INSTALL_DIR = xcopy /s /q /y /i
QINSTALL = D:\Qt\5.15.2\msvc2019_64\bin\qmake.exe -install qinstall
QINSTALL_PROGRAM = D:\Qt\5.15.2\msvc2019_64\bin\qmake.exe -install qinstall -exe
DEL_FILE = del
SYMLINK = $(QMAKE) -install ln -f -s
DEL_DIR = rmdir
MOVE = move
IDC = idc
IDL = midl
ZIP = zip -r -9
DEF_FILE =
RES_FILE =
SED = $(QMAKE) -install sed
MOVE = move
SUBTARGETS =
debug
release

debug: $(MAKEFILE) FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug
debug-make_first: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug
debug-all: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug all
debug-clean: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug clean
debug-distclean: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug distclean
debug-install: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug install
debug-uninstall: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug uninstall
release: $(MAKEFILE) FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release
release-make_first: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release
release-all: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release all
release-clean: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release clean
release-distclean: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release distclean
release-install: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release install
release-uninstall: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release uninstall

Makefile: ..\test\test.pro D:\Qt\5.15.2\msvc2019_64\mkspecs\win32-msvc\qmake.conf D:\Qt\5.15.2\msvc2019_64\mkspecs\features\spec_pre.prf
...
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dcore_private.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dextras.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dextras_private.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dinput.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dinput_private.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dlogic.pri
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D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dquick.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dquick_private.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dquickanimation.pri
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D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dquickextras.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dquickextras_private.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dquickinput.pri
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D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dquickrender.pri
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D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dquickscene2d.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dquickscene2d_private.pri
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D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_accessibility_support_private.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_axbase.pri
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D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_axcontainer.pri
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release\qmake_qmake_qm_files.qrc
$(QMAKE) -o Makefile ..\test\test.pro -spec win32-msvc "CONFIG+=debug" "CONFIG+=qml_debug"
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D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_qml.pri:
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_qml_private.pri:
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_qmldebug_private.pri:
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_qmldevtools_private.pri:
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_qmlmodels.pri:
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D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_qmltest.pri:
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D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_qmlworkerscript_private.pri:
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_qtmultimediaquicktools_private.pri:
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D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_quickcontrols2_private.pri:
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D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_script_private.pri:
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D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_scripttools_private.pri:
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D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_serialbus_private.pri:
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D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_serialport_private.pri:
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_sql.pri:
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D:\Qt\5.15.2\msvc2019_64\mkspecs\features\exclusive_builds_post.prf:
D:\Qt\5.15.2\msvc2019_64\mkspecs\features\default_post.prf:
D:\Qt\5.15.2\msvc2019_64\mkspecs\features\lrelease.prf:
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D:\Qt\5.15.2\msvc2019_64\mkspecs\features\precompile_header.prf:
D:\Qt\5.15.2\msvc2019_64\mkspecs\features\warn_on.prf:
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D:\Qt\5.15.2\msvc2019_64\mkspecs\features\resources.prf:
D:\Qt\5.15.2\msvc2019_64\mkspecs\features\moc.prf:
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D:\Qt\5.15.2\msvc2019_64\mkspecs\features\win32\windows.prf:
D:\Qt\5.15.2\msvc2019_64\mkspecs\features\testcase_targets.prf:
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D:\Qt\5.15.2\msvc2019_64\mkspecs\features\yacc.prf:
D:\Qt\5.15.2\msvc2019_64\mkspecs\features\lex.prf:
..\test\test.pro:
D:\Qt\5.15.2\msvc2019_64\lib\Qt5Widgets.prl:
D:\Qt\5.15.2\msvc2019_64\lib\Qt5Gui.prl:
D:\Qt\5.15.2\msvc2019_64\lib\Qt5Core.prl:
D:\Qt\5.15.2\msvc2019_64\lib\qtmain.prl:
.qmake.stash:
D:\Qt\5.15.2\msvc2019_64\mkspecs\features\build_pass.prf:
debug\qmake_qmake_qm_files.qrc:
D:\Qt\5.15.2\msvc2019_64\lib\Qt5Widgetsd.prl:
D:\Qt\5.15.2\msvc2019_64\lib\Qt5Guid.prl:
D:\Qt\5.15.2\msvc2019_64\lib\Qt5Cored.prl:
D:\Qt\5.15.2\msvc2019_64\lib\qtmaind.prl:
release\qmake_qmake_qm_files.qrc:
qmake: FORCE
@$(QMAKE) -o Makefile ..\test\test.pro -spec win32-msvc "CONFIG+=debug" "CONFIG+=qml_debug"

qmake_all: FORCE

make_first: debug-make_first release-make_first FORCE
all: debug-all release-all FORCE
clean: debug-clean release-clean FORCE
-$(DEL_FILE) test.vc.pdb
-$(DEL_FILE) test.ilk
-$(DEL_FILE) test.idb
distclean: debug-distclean release-distclean FORCE
-$(DEL_FILE) Makefile
-$(DEL_FILE) .qmake.stash test.pdb

debug-mocclean:
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug mocclean
release-mocclean:
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release mocclean
mocclean: debug-mocclean release-mocclean

debug-mocables:
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug mocables
release-mocables:
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release mocables
mocables: debug-mocables release-mocables

check: first

benchmark: first
FORCE:

$(MAKEFILE).Debug: Makefile
$(MAKEFILE).Release: Makefile

[SGaist]

You are missing the "-l" in your LIBS lines.

[superdu]

hum, but they are presents in makefile.debug

i also try again this notation but still the same problem

LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_calib3d
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_core
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_dnn
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_features2d
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_flann
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_highgui
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_imgcodecs
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_imgproc
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_ml
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_objdetect
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_photo
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_stitching
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_video
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_videoio

[SGaist]

So if you build in debug mode it works ?