Symbols not found for architecture x86_64 MacOS Yosemite

clonatron

Hi there!

I'm really new in all of this, and I don't know anything about terminal and stuff... I (think) installed openCV 2.4.10 and qtCreator 3.3.0 using terminal commands:

cd /Users/Sergio/Downloads/opencv-2.4.9
mkdir build
cd build
cmake -G "Unix Makefiles" ..
make -j8
sudo make install

It seems ok, folders appear on usr/local/... I don't know how to use QtCreator so I create a console project and add this to the .pro:

@
#-------------------------------------------------

Project created by QtCreator 2015-02-18T09:40:59

#-------------------------------------------------

QT += core

QT -= gui

TARGET = cosa
CONFIG += console
CONFIG -= app_bundle

TEMPLATE = app

QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.9

SOURCES += main.cpp

INCLUDEPATH += "/usr/local/include" \

LIBS += -L"/usr/local/lib"
-lopencv_core
-lopencv_highgui

@

Then into the main.cpp added this (from an example i got online):

@
#include "opencv2/opencv.hpp"
#include "opencv2/highgui/highgui.hpp"

using namespace cv;

int main( int argc, char **argv)
{
Mat image = imread( argv[1], CV_LOAD_IMAGE_COLOR );

namedWindow( "Original", CV_WINDOW_NORMAL | CV_WINDOW_KEEPRATIO | CV_GUI_EXPANDED );
imshow( "Original", image );

// Sobel example from http://docs.opencv.org/doc/user_guide/ug_mat.html#visualizing-images
Mat gray;

cvtColor( image, gray, CV_BGR2GRAY );

Mat sobelx;

Sobel( gray, sobelx, CV_32F, 1, 0 );

double minVal = 0.0;
double maxVal = 0.0;

minMaxLoc( sobelx, &minVal, &maxVal ); //find minimum and maximum intensities

Mat draw;

sobelx.convertTo( draw, CV_8U, 255.0/(maxVal - minVal), -minVal * 255.0/(maxVal - minVal) );

namedWindow( "Sobel", CV_WINDOW_NORMAL | CV_WINDOW_KEEPRATIO | CV_GUI_EXPANDED );
imshow( "Sobel", draw );

while ( waitKey( 33 ) != 27 )
;

return 0;
}

@

When I click on Run (is that the way I should do that?) in the issue section displays:

@error: symbol(s) not found for architecture x86_64
error: linker command failed with exit code 1 (use -v to see invocation)@

And the compile output shows this:

@09:59:55: Running steps for project cosa...
09:59:55: Configuration unchanged, skipping qmake step.
09:59:55: Starting: "/usr/bin/make"
/Users/Sergio/Qt5.4.0/5.4/clang_64/bin/qmake -spec macx-clang CONFIG+=debug CONFIG+=x86_64 -o Makefile ../cosa/cosa.pro
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -headerpad_max_install_names -Wl,-syslibroot,/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk -mmacosx-version-min=10.9 -Wl,-rpath,/Users/Sergio/Qt5.4.0/5.4/clang_64/lib -o cosa main.o -F/Users/Sergio/Qt5.4.0/5.4/clang_64/lib -L/usr/local/lib -lopencv_core -lopencv_highgui -framework QtCore -framework DiskArbitration -framework IOKit
Undefined symbols for architecture x86_64:
"cv::namedWindow(std::string const&, int)", referenced from:
_main in main.o
"cv::Sobel(cv::_InputArray const&, cv::_OutputArray const&, int, int, int, int, double, double, int)", referenced from:
_main in main.o
"cv::imread(std::string const&, int)", referenced from:
_main in main.o
"cv::imshow(std::string const&, cv::_InputArray const&)", referenced from:
_main in main.o
"cv::cvtColor(cv::_InputArray const&, cv::_OutputArray const&, int, int)", referenced from:
_main in main.o
"std::allocator<char>::allocator()", referenced from:
_main in main.o
"std::allocator<char>::~allocator()", referenced from:
_main in main.o
"std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)", referenced from:
_main in main.o
"std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()", referenced from:
_main in main.o
"std::ios_base::Init::Init()", referenced from:
___cxx_global_var_init in main.o
"std::ios_base::Init::~Init()", referenced from:
___cxx_global_var_init in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [cosa] Error 1
09:59:55: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project cosa (kit: Desktop Qt 5.4.0 clang 64bit)
When executing step "Make"
09:59:55: Elapsed time: 00:00.@

Why is that? can anybody help me, please? I read a lot about it but i can't understand a word :(

I need to start using this programs in a class and i don't have any idea about anything!!

Thank you :)

SGaist

Hi and welcome to devnet,

Are you use you've built OpenCV for x86_64 ? (should be but who knows…)

Call "file" one of the OpenCV libraries to check

clonatron

I just downloaded the one suggested by the website on MacOS so i guess so... i don't know how to call file, how should I do that?

SGaist

@file /usr/local/lib/libopencv_core.dylib@

Correct the library file name as needed

saeedBaba

I faced the same error.
checked the file and the architecture is correct:
/usr/local/lib/libopencv_core.dylib: Mach-O 64-bit dynamically linked shared library x86_64

But I get the same architecture error.
Any Ideas?

jsulm

@saeedBaba Do you link against this lib?
Can you show the linker call together with error message?
Also, please show the pro file.

saeedBaba

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

SOURCES += \
    main.cpp \
    dialog.cpp

HEADERS += \
    dialog.h

FORMS += \
    dialog.ui

INCLUDEPATH += /usr/local/include/opencv4

LIBS += -L/usr/local/lib \
     -lopencv_core \
     -lopencv_imgproc \
     -lopencv_features2d\
     -lopencv_highgui

QMAKE_MACOSX_DEPLOYMENT_TARGET = 11.0

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

ERROR SECTION:

SDKs/MacOSX.sdk -mmacosx-version-min=11.0 -Wl,-rpath,@executable_path/../Frameworks -Wl,-rpath,/Users/apple/Qt6/6.1.1/clang_64/lib -o opencv_test.app/Contents/MacOS/opencv_test main.o dialog.o moc_dialog.o   -F/Users/apple/Qt6/6.1.1/clang_64/lib -L/usr/local/lib -lopencv_core -lopencv_imgproc -lopencv_features2d -lopencv_highgui -framework QtWidgets -framework QtGui -framework AppKit -framework ImageIO -framework Metal -framework QtCore -framework DiskArbitration -framework IOKit -framework AGL -framework OpenGL   


Undefined symbols for architecture x86_64:
  "cv::imread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, int)", referenced from:
      _main in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [opencv_test.app/Contents/MacOS/opencv_test] Error 1
12:47:31: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project opencv_test (kit: Desktop Qt 6.1.1 clang 64bit)
When executing step "Make"

jsulm

@saeedBaba Maybe you need to link agains opencv_imcodec?

saeedBaba

@jsulm Please explain how to do that?

I have been able to make it work with CMake but not qmake.
is this correct that qmake caanot work with opencv without CMake?

jsulm

@saeedBaba said in Symbols not found for architecture x86_64 MacOS Yosemite:

Please explain how to do that?

In exact same way you do it for other opencv_* libs in your pro file. But I'm not sure there is actually libopencv_imcodec.
"is this correct that qmake caanot work with opencv without CMake?" - not sure what you mean, qmake does not depend on CMake in any way.

How did you install the OpenCV libs? Did you build them by yourself? Using same compiler?

saeedBaba

@jsulm said in Symbols not found for architecture x86_64 MacOS Yosemite:

build t

I did not build anything. I just installed opencv and just includepath to the directory.
Am I supposed to build libs? How one does that?

Is not this supposed to be a straight forward process? Why cannot qt make it simpler?

jsulm

@saeedBaba said in Symbols not found for architecture x86_64 MacOS Yosemite:

Why cannot qt make it simpler?

What does Qt have to do with OpenCV?!

I did not say you have to build it, I wanted to know how you installed it.
The problem could be that the compiler used to build OpenCV isn't compatible with what was used to build Qt.

saeedBaba

ok I still do not know how to solve this.

How can I reinstall opencv to be compatible?

jsulm

@saeedBaba said in Symbols not found for architecture x86_64 MacOS Yosemite:

How can I reinstall opencv to be compatible?

You could build OpenCV by yourself using same compiler as you use for your Qt project.
See https://docs.opencv.org/master/d0/db2/tutorial_macos_install.html for details.

But maybe we should first clarify that this is really the issue.
Can you post whole build log? At least the part where linker is called and its output. Usually linker would print a warning if it dismisses an incompatible library.

saeedBaba

@jsulm said in Symbols not found for architecture x86_64 MacOS Yosemite:

https://docs.opencv.org/master/d0/db2/tutorial_macos_install.html

it this the whole build log?

14:27:37: Running steps for project opencv_test_qmake...
14:27:37: Configuration unchanged, skipping qmake step.
14:27:37: Starting: "/usr/bin/make" -j8
/Users/apple/Qt6/6.1.1/clang_64/bin/qmake -o Makefile ../opencv_test_qmake/opencv_test_qmake.pro -spec macx-clang CONFIG+=debug CONFIG+=x86_64 CONFIG+=qml_debug
/Library/Developer/CommandLineTools/usr/bin/clang++ -stdlib=libc++ -headerpad_max_install_names  -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -mmacosx-version-min=11.0 -Wl,-rpath,@executable_path/../Frameworks -Wl,-rpath,/Users/apple/Qt6/6.1.1/clang_64/lib -o opencv_test_qmake.app/Contents/MacOS/opencv_test_qmake main.o dialog.o moc_dialog.o   -F/Users/apple/Qt6/6.1.1/clang_64/lib -L/usr/local/lib -lopencv_core -lopencv_imgproc -lopencv_features2d -lopencv_highgui -lopencv_calib3d -framework QtWidgets -framework QtGui -framework AppKit -framework ImageIO -framework Metal -framework QtCore -framework DiskArbitration -framework IOKit -framework AGL -framework OpenGL   
Undefined symbols for architecture x86_64:
  "cv::imread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, int)", referenced from:
      _main in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [opencv_test_qmake.app/Contents/MacOS/opencv_test_qmake] Error 1
14:27:37: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project opencv_test_qmake (kit: Desktop Qt 6.1.1 clang 64bit)
When executing step "Make"
14:27:37: Elapsed time: 00:00.

if not, where can I find it?

jsulm

@saeedBaba Looks good.
Please try to add opencv_imcodec to LIBS as I suggested before. I think this is the lib where cv::imread is actually defined.

saeedBaba

@jsulm said in Symbols not found for architecture x86_64 MacOS Yosemite:

opencv_imcodec

same error:

15:19:32: Running steps for project opencv_test_qmake...
15:19:33: Starting: "/Users/apple/Qt6/6.1.1/clang_64/bin/qmake" /usr/local/lib/C++Project/Qt6/opencv_test_qmake/opencv_test_qmake.pro -spec macx-clang CONFIG+=debug CONFIG+=x86_64 CONFIG+=qml_debug
Info: creating stash file /usr/local/lib/C++Project/Qt6/build-opencv_test_qmake-Desktop_Qt_6_1_1_clang_64bit-Debug/.qmake.stash
15:19:33: The process "/Users/apple/Qt6/6.1.1/clang_64/bin/qmake" exited normally.
15:19:33: Starting: "/usr/bin/make" -f /usr/local/lib/C++Project/Qt6/build-opencv_test_qmake-Desktop_Qt_6_1_1_clang_64bit-Debug/Makefile qmake_all
make: Nothing to be done for `qmake_all'.
15:19:33: The process "/usr/bin/make" exited normally.
15:19:33: Starting: "/usr/bin/make" -j8
/Users/apple/Qt6/6.1.1/clang_64/libexec/uic ../opencv_test_qmake/dialog.ui -o ui_dialog.h
/Library/Developer/CommandLineTools/usr/bin/clang++ -c -pipe -stdlib=libc++ -g -std=gnu++1z  -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -mmacosx-version-min=11.0 -Wall -Wextra -fPIC -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../opencv_test_qmake -I. -I../../../../include/opencv4 -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtWidgets.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtGui.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtCore.framework/Headers -I. -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/OpenGL.framework/Headers -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/AGL.framework/Headers -I. -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/OpenGL.framework/Headers -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/AGL.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/mkspecs/macx-clang -F/Users/apple/Qt6/6.1.1/clang_64/lib -o main.o ../opencv_test_qmake/main.cpp
/Library/Developer/CommandLineTools/usr/bin/clang++ -c -pipe -stdlib=libc++ -g -std=gnu++1z  -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -mmacosx-version-min=11.0 -Wall -Wextra -fPIC -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../opencv_test_qmake -I. -I../../../../include/opencv4 -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtWidgets.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtGui.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtCore.framework/Headers -I. -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/OpenGL.framework/Headers -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/AGL.framework/Headers -I. -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/OpenGL.framework/Headers -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/AGL.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/mkspecs/macx-clang -F/Users/apple/Qt6/6.1.1/clang_64/lib -o dialog.o ../opencv_test_qmake/dialog.cpp
/Library/Developer/CommandLineTools/usr/bin/clang++ -pipe -stdlib=libc++ -g -std=gnu++1z  -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -mmacosx-version-min=11.0 -Wall -Wextra -dM -E -o moc_predefs.h /Users/apple/Qt6/6.1.1/clang_64/mkspecs/features/data/dummy.cpp
/Users/apple/Qt6/6.1.1/clang_64/libexec/moc -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB --include /usr/local/lib/C++Project/Qt6/build-opencv_test_qmake-Desktop_Qt_6_1_1_clang_64bit-Debug/moc_predefs.h -I/Users/apple/Qt6/6.1.1/clang_64/mkspecs/macx-clang -I/usr/local/lib/C++Project/Qt6/opencv_test_qmake -I/usr/local/include/opencv4 -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtWidgets.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtGui.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtCore.framework/Headers -I. -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1 -I/Library/Developer/CommandLineTools/usr/lib/clang/12.0.5/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -I/Library/Developer/CommandLineTools/usr/include -F/Users/apple/Qt6/6.1.1/clang_64/lib ../opencv_test_qmake/dialog.h -o moc_dialog.cpp
/Library/Developer/CommandLineTools/usr/bin/clang++ -c -pipe -stdlib=libc++ -g -std=gnu++1z  -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -mmacosx-version-min=11.0 -Wall -Wextra -fPIC -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../opencv_test_qmake -I. -I../../../../include/opencv4 -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtWidgets.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtGui.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtCore.framework/Headers -I. -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/OpenGL.framework/Headers -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/AGL.framework/Headers -I. -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/OpenGL.framework/Headers -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/AGL.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/mkspecs/macx-clang -F/Users/apple/Qt6/6.1.1/clang_64/lib -o moc_dialog.o moc_dialog.cpp
/Library/Developer/CommandLineTools/usr/bin/clang++ -stdlib=libc++ -headerpad_max_install_names  -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -mmacosx-version-min=11.0 -Wl,-rpath,@executable_path/../Frameworks -Wl,-rpath,/Users/apple/Qt6/6.1.1/clang_64/lib -o opencv_test_qmake.app/Contents/MacOS/opencv_test_qmake main.o dialog.o moc_dialog.o   -F/Users/apple/Qt6/6.1.1/clang_64/lib -L/usr/local/lib -lopencv_core -lopencv_imgproc -lopencv_features2d -lopencv_highgui -lopencv_calib3d -opencv_imcodec -framework QtWidgets -framework QtGui -framework AppKit -framework ImageIO -framework Metal -framework QtCore -framework DiskArbitration -framework IOKit -framework AGL -framework OpenGL   
Undefined symbols for architecture x86_64:
  "cv::imread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, int)", referenced from:
      _main in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [opencv_test_qmake.app/Contents/MacOS/opencv_test_qmake] Error 1
15:19:36: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project opencv_test_qmake (kit: Desktop Qt 6.1.1 clang 64bit)
When executing step "Make"
15:19:36: Elapsed time: 00:03.

Need Reputation to post more often.

jsulm

@saeedBaba Did you do a complete rebuild after changing pro file? Delete build folder, run qmake and build?

saeedBaba

Need more reputation to post faster.

15:19:32: Running steps for project opencv_test_qmake...
15:19:33: Starting: "/Users/apple/Qt6/6.1.1/clang_64/bin/qmake" /usr/local/lib/C++Project/Qt6/opencv_test_qmake/opencv_test_qmake.pro -spec macx-clang CONFIG+=debug CONFIG+=x86_64 CONFIG+=qml_debug
Info: creating stash file /usr/local/lib/C++Project/Qt6/build-opencv_test_qmake-Desktop_Qt_6_1_1_clang_64bit-Debug/.qmake.stash
15:19:33: The process "/Users/apple/Qt6/6.1.1/clang_64/bin/qmake" exited normally.
15:19:33: Starting: "/usr/bin/make" -f /usr/local/lib/C++Project/Qt6/build-opencv_test_qmake-Desktop_Qt_6_1_1_clang_64bit-Debug/Makefile qmake_all
make: Nothing to be done for `qmake_all'.
15:19:33: The process "/usr/bin/make" exited normally.
15:19:33: Starting: "/usr/bin/make" -j8
/Users/apple/Qt6/6.1.1/clang_64/libexec/uic ../opencv_test_qmake/dialog.ui -o ui_dialog.h
/Library/Developer/CommandLineTools/usr/bin/clang++ -c -pipe -stdlib=libc++ -g -std=gnu++1z  -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -mmacosx-version-min=11.0 -Wall -Wextra -fPIC -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../opencv_test_qmake -I. -I../../../../include/opencv4 -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtWidgets.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtGui.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtCore.framework/Headers -I. -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/OpenGL.framework/Headers -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/AGL.framework/Headers -I. -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/OpenGL.framework/Headers -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/AGL.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/mkspecs/macx-clang -F/Users/apple/Qt6/6.1.1/clang_64/lib -o main.o ../opencv_test_qmake/main.cpp
/Library/Developer/CommandLineTools/usr/bin/clang++ -c -pipe -stdlib=libc++ -g -std=gnu++1z  -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -mmacosx-version-min=11.0 -Wall -Wextra -fPIC -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../opencv_test_qmake -I. -I../../../../include/opencv4 -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtWidgets.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtGui.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtCore.framework/Headers -I. -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/OpenGL.framework/Headers -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/AGL.framework/Headers -I. -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/OpenGL.framework/Headers -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/AGL.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/mkspecs/macx-clang -F/Users/apple/Qt6/6.1.1/clang_64/lib -o dialog.o ../opencv_test_qmake/dialog.cpp
/Library/Developer/CommandLineTools/usr/bin/clang++ -pipe -stdlib=libc++ -g -std=gnu++1z  -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -mmacosx-version-min=11.0 -Wall -Wextra -dM -E -o moc_predefs.h /Users/apple/Qt6/6.1.1/clang_64/mkspecs/features/data/dummy.cpp
/Users/apple/Qt6/6.1.1/clang_64/libexec/moc -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB --include /usr/local/lib/C++Project/Qt6/build-opencv_test_qmake-Desktop_Qt_6_1_1_clang_64bit-Debug/moc_predefs.h -I/Users/apple/Qt6/6.1.1/clang_64/mkspecs/macx-clang -I/usr/local/lib/C++Project/Qt6/opencv_test_qmake -I/usr/local/include/opencv4 -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtWidgets.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtGui.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtCore.framework/Headers -I. -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1 -I/Library/Developer/CommandLineTools/usr/lib/clang/12.0.5/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -I/Library/Developer/CommandLineTools/usr/include -F/Users/apple/Qt6/6.1.1/clang_64/lib ../opencv_test_qmake/dialog.h -o moc_dialog.cpp
/Library/Developer/CommandLineTools/usr/bin/clang++ -c -pipe -stdlib=libc++ -g -std=gnu++1z  -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -mmacosx-version-min=11.0 -Wall -Wextra -fPIC -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../opencv_test_qmake -I. -I../../../../include/opencv4 -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtWidgets.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtGui.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/lib/QtCore.framework/Headers -I. -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/OpenGL.framework/Headers -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/AGL.framework/Headers -I. -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/OpenGL.framework/Headers -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/AGL.framework/Headers -I/Users/apple/Qt6/6.1.1/clang_64/mkspecs/macx-clang -F/Users/apple/Qt6/6.1.1/clang_64/lib -o moc_dialog.o moc_dialog.cpp
/Library/Developer/CommandLineTools/usr/bin/clang++ -stdlib=libc++ -headerpad_max_install_names  -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -mmacosx-version-min=11.0 -Wl,-rpath,@executable_path/../Frameworks -Wl,-rpath,/Users/apple/Qt6/6.1.1/clang_64/lib -o opencv_test_qmake.app/Contents/MacOS/opencv_test_qmake main.o dialog.o moc_dialog.o   -F/Users/apple/Qt6/6.1.1/clang_64/lib -L/usr/local/lib -lopencv_core -lopencv_imgproc -lopencv_features2d -lopencv_highgui -lopencv_calib3d -opencv_imcodec -framework QtWidgets -framework QtGui -framework AppKit -framework ImageIO -framework Metal -framework QtCore -framework DiskArbitration -framework IOKit -framework AGL -framework OpenGL   
Undefined symbols for architecture x86_64:
  "cv::imread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, int)", referenced from:
      _main in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [opencv_test_qmake.app/Contents/MacOS/opencv_test_qmake] Error 1
15:19:36: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project opencv_test_qmake (kit: Desktop Qt 6.1.1 clang 64bit)
When executing step "Make"
15:19:36: Elapsed time: 00:03.

jsulm

@saeedBaba I don't see -lopencv_imcodec in the linker call.
Please post your current pro file, it looks like you forgot to put - in -opencv_imcodec -> should be -lopencv_imcodec
And I think it should be: -lopencv_imgcodecs