I am intending to compile the following opencv code:
#include <stdio.h>
#include <opencv2/opencv.hpp>
using namespace cv;
int main(int argc, char** argv )
{
printf("hello world \n");
return 0;
}
My CMakeLists.txt is the following:
cmake_minimum_required(VERSION 2.8)
find_package( OpenCV REQUIRED )
project( main )
add_executable(main main.cpp )
target_link_libraries( main ${OpenCV_LIBS} )
When compiled the result is as follows:
[ 50%] Building CXX object CMakeFiles/main.dir/main.cpp.o
[100%] Linking CXX executable main
/usr/bin/ld: cannot find -lQt5::Core
/usr/bin/ld: cannot find -lQt5::Gui
/usr/bin/ld: cannot find -lQt5::Widgets
/usr/bin/ld: cannot find -lQt5::Test
/usr/bin/ld: cannot find -lQt5::Concurrent
/usr/bin/ld: cannot find -lQt5::OpenGL
collect2: error: ld returned 1 exit status
CMakeFiles/main.dir/build.make:143: recipe for target 'main' failed
make[2]: *** [main] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/main.dir/all' failed
make[1]: *** [CMakeFiles/main.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2
I believe that CMake in automatic way include Qt5 libraries, I would want to know how avoid this situation.
Ideology of CMake is to never add something that is not required. It is possible that Qt libs were added to configuration list of CMake.
They might be featured in standard variable you use. You can print content by
message(STATUS "OpenCV_LIBS = ${OpenCV_LIBS}")
Configuration file looks OpenCVConfig.cmake.in and may include other files which for some reason were changed.
Related
I've been trying to get SDL2 to link with my project but I think my cmake file is no good. I get this error
====================[ Build | Chip_8_Interpreter | Debug ]======================
"C:\Program Files\JetBrains\CLion 2018.3.4\bin\cmake\win\bin\cmake.exe" --build "D:\Dropbox\Programming\Chip-8 Interpreter\cmake-build-debug" --target Chip_8_Interpreter -- -j 4
[ 50%] Linking CXX executable Chip_8_Interpreter.exe
c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../libmingw32.a(main.o):(.text.startup+0xa0): undefined reference to `WinMain#16'
collect2.exe: error: ld returned 1 exit status
mingw32-make.exe[3]: *** [Chip_8_Interpreter.exe] Error 1
CMakeFiles\Chip_8_Interpreter.dir\build.make:87: recipe for target 'Chip_8_Interpreter.exe' failed
mingw32-make.exe[2]: *** [CMakeFiles/Chip_8_Interpreter.dir/all] Error 2
CMakeFiles\Makefile2:71: recipe for target 'CMakeFiles/Chip_8_Interpreter.dir/all' failed
mingw32-make.exe[1]: *** [CMakeFiles/Chip_8_Interpreter.dir/rule] Error 2
CMakeFiles\Makefile2:83: recipe for target 'CMakeFiles/Chip_8_Interpreter.dir/rule' failed
mingw32-make.exe: *** [Chip_8_Interpreter] Error 2
Makefile:117: recipe for target 'Chip_8_Interpreter' failed
And currently my CMakeLists.txt looks like this
cmake_minimum_required(VERSION 3.14)
project(Chip_8_Interpreter)
set(CMAKE_CXX_STANDARD 14)
# include cmake/FindSDL2.cmake
set(SDL2_PATH "C:\\SDL2-2.0.12\\i686-w64-mingw32")
set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
find_package(SDL2 REQUIRED)
include_directories(${SDL2_INCLUDE_DIR})
add_executable(Chip_8_Interpreter main.cpp)
target_link_libraries(Chip_8_Interpreter ${SDL2_LIBRARY} -lmingw32 -lSDL2main -lSDL2 -mwindows)
And my main.cpp is just the basic SDL example. I've also recently installed MinGW and SDL2, so they should both be the newest stable release.
I am receiving following error while executing a program in clion.
"C:\Program Files\JetBrains\CLion 2019.2.3\bin\cmake\win\bin\cmake.exe" --build C:\Users\two43\CLionProjects\cse\cmake-build-debug --target cse -- -j 2
[ 25%] Linking CXX executable cse.exe
CMakeFiles\cse.dir\build.make:114: recipe for target 'cse.exe' failed
c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: CMakeFiles\cse.dir/objects.a(lecture-2.cpp.obj): in function `main':
C:/Users/two43/CLionProjects/cse/lecture-2.cpp:24: multiple definition of `main'; CMakeFiles\cse.dir/objects.a(lecture-1.cpp.obj):C:/Users/two43/CLionProjects/cse/lecture-1.cpp:19: first defined here
collect2.exe: error: ld returned 1 exit status
mingw32-make.exe[3]: *** [cse.exe] Error 1
mingw32-make.exe[2]: *** [CMakeFiles/cse.dir/all] Error 2
CMakeFiles\Makefile2:74: recipe for target 'CMakeFiles/cse.dir/all' failed
mingw32-make.exe[1]: *** [CMakeFiles/cse.dir/rule] Error 2
CMakeFiles\Makefile2:81: recipe for target 'CMakeFiles/cse.dir/rule' failed
mingw32-make.exe: *** [cse] Error 2
Makefile:117: recipe for target 'cse' failed
Following is the CMakeLists.txt file:
cmake_minimum_required(VERSION 3.15)
project(cse)
set(CMAKE_CXX_STANDARD 17)
add_executable(cse main.cpp lecture-1.cpp lecture-2.cpp)
You are compiling two files, cse/lecture-1.cpp and cse/lecture-2.cpp. Both contain a main function. You cannot build a single executable with multiple main functions.
Make them separate executables by using add_executable two times in your CMake definitions. I would show you how if you provided your CMake definitions.
Edit: Based on your CMake definitions, use
cmake_minimum_required(VERSION 3.15)
project(cse)
set(CMAKE_CXX_STANDARD 17)
add_executable(lecture-1 main.cpp lecture-1.cpp)
add_executable(lecture-2 main.cpp lecture-2.cpp)
This assumes main.cpp, despite its name, does not contain another main function. If it does, you'll need a separate add_executable for it too.
I want to run OpenCV on VS Code IDE with CMake, but it shows undefined reference to cv::imread(). I've tried several ways (e.g edit PATH variables...) to solve the problem, however it still can link to the opencv library.
Here is my CMakelists.txt
# cmake needs this line
cmake_minimum_required(VERSION 2.8)
# Enable C++11
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED TRUE)
# Define project name
project(cvtest)
# Find OpenCV, you may need to set OpenCV_DIR variable
# to the absolute path to the directory containing OpenCVConfig.cmake file
# via the command line or GUI
find_package(OpenCV REQUIRED)
set(OpenCV_INCLUDE_DIRS "C:/opencv/build/include")
include_directories(${OpenCV_INCLUDE_DIRS})
# If the package has been found, several variables will
# be set, you can find the full list with descriptions
# in the OpenCVConfig.cmake file.
# Print some message showing some of them
message(STATUS "OpenCV library status:")
message(STATUS " version: ${OpenCV_VERSION}")
message(STATUS " libraries: ${OpenCV_LIBS}")
message(STATUS " include path: ${OpenCV_INCLUDE_DIRS}")
# Declare the executable target built from your sources
add_executable(cvtest cvtest.cpp)
# Link your application with OpenCV libraries
target_link_libraries(cvtest ${OpenCV_LIBS})
After finishing CMake settings, I run $ cmake -G "MinGW Makefiles".
-- OpenCV library status:
-- version: 2.4.13.6
-- libraries: opencv_videostab;opencv_video;opencv_ts;opencv_superres;opencv_stitching;opencv_photo;opencv_ocl;opencv_objdetect;opencv_nonfree;opencv_ml;opencv_legacy;opencv_imgproc;opencv_highgui;opencv_gpu;opencv_flann;opencv_features2d;opencv_core;opencv_contrib;opencv_calib3d
-- include path: C:/opencv/build/include
At last, I run $ mingw32-make, but it came out with some errors
Scanning dependencies of target cvtest
[ 50%] Building CXX object CMakeFiles/cvtest.dir/cvtest.cpp.obj
[100%] Linking CXX executable cvtest.exe
CMakeFiles\cvtest.dir/objects.a(cvtest.cpp.obj):cvtest.cpp:(.text+0x63):
undefined reference to cv::imread(std::string const&, int)'
CMakeFiles\cvtest.dir/objects.a(cvtest.cpp.obj):cvtest.cpp:(.text+0x87):
undefined reference to cv::_InputArray::_InputArray(cv::Mat const&)'
CMakeFiles\cvtest.dir/objects.a(cvtest.cpp.obj):cvtest.cpp:(.text+0xc1):
undefined reference to cv::imshow(std::string const&, cv::_InputArray const&)'
c:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe:
CMakeFiles\cvtest.dir/objects.a(cvtest.cpp.obj): bad reloc address 0xf in section `.text$_ZN2cv3MatD1Ev[__ZN2cv3MatD1Ev]'
c:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe:
final link failed: Invalid operation
collect2.exe: error: ld returned 1 exit status
CMakeFiles\cvtest.dir\build.make:104: recipe for target 'cvtest.exe' failed
mingw32-make[2]: *** [cvtest.exe] Error 1
CMakeFiles\Makefile2:71: recipe for target 'CMakeFiles/cvtest.dir/all' failed
mingw32-make[1]: *** [CMakeFiles/cvtest.dir/all] Error 2
Makefile:82: recipe for target 'all' failed
mingw32-make: *** [all] Error 2
Here is cvtest.cpp
#include <cstdio>
#include <iostream>
#include <opencv2/opencv.hpp>
using namespace cv;
using namespace std;
int main(int argc, char *argv[]) {
Mat img = imread("lena.bmp", CV_LOAD_IMAGE_COLOR);
imshow("lena", img);
}
Did I misunderstanding something I should know and how can I correct it ? Thanks !
I want to build an executable that includes all of libs that I used (opencv, dlib) so it can work on any computer.
Here is my current CMakeList.txt
cmake_minimum_required(VERSION 3.5.1)
project(adc_fr)
set(CMAKE_CXX_STANDARD 14)
add_subdirectory(/media/sf_dlib-19.9/dlib dlib_build)
FIND_PACKAGE(OpenCV REQUIRED)
set(SOURCE_FILES
FDetect.cpp
FDetect.h
FExtract.cpp
FExtract.h
main.cpp
)
add_executable(adc_fr ${SOURCE_FILES})
set_target_properties(adc_fr PROPERTIES LINK_FLAGS "-static")
target_link_libraries(adc_fr
${OpenCV_LIBS}
dlib
)
Here is the error I got when linking
/usr/bin/ld: attempted static link of dynamic object `/usr/lib/x86_64-linux-gnu/libwebp.so'
collect2: error: ld returned 1 exit status
CMakeFiles/adc_fr.dir/build.make:409: recipe for target 'adc_fr' failed
make[2]: *** [adc_fr] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/adc_fr.dir/all' failed
make[1]: *** [CMakeFiles/adc_fr.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2
I do have libwebp.a available in /usr/lib/x86_64-linux-gnu/
How can I force to use static libwebp.a instead of libwebp.so?
I did try to add #SET(CMAKE_FIND_LIBRARY_SUFFIXES ".a") but it still gave the same error.
Much appreciated!
How about this:
find_library(LIBWEBP_LOCATION libwebp.a)
target_link_libraries(adc_fr
${OpenCV_LIBS}
dlib
${LIBWEBP_LOCATION}
)
As part of a project I'm working on, I need to make use of the WebKitGTK+ library.
I downloaded the library (tarball) and compiled it as described here.
After the compilation was done:
The lib's headers are in /usr/local/include.
The lib's .so files are in /usr/local/lib.
In my C++ project I tried to add the following CMakeLists.txt file:
cmake_minimum_required(VERSION 3.7)
project(CVE_2016_4657)
set(CMAKE_CXX_STANDARD 11)
set(SOURCE_FILES main.cpp)
add_executable(CVE_2016_4657 ${SOURCE_FILES})
find_package(PkgConfig REQUIRED)
include_directories(/usr/local/include/webkitgtk-4.0)
link_directories(/usr/local/lib/webkit2gtk-4.0)
pkg_check_modules(GTK3 REQUIRED gtk+-3.0)
include_directories(${GTK3_INCLUDE_DIRS})
link_directories(${GTK3_LIBRARY_DIRS})
add_definitions(${GTK3_CFLAGS_OTHER})
pkg_check_modules(SOUP REQUIRED libsoup-2.4)
include_directories(${SOUP_INCLUDE_DIRS})
link_directories(${SOUP_LIBRARY_DIRS})
add_definitions(${SOUP_CFLAGS_OTHER})
target_link_libraries(
CVE_2016_4657
${GTK3_LIBRARIES}
${SOUP_LIBRARIES})
However, when compiling the project I'm getting the following error:
[ 50%] Linking CXX executable CVE_2016_4657
CMakeFiles/CVE_2016_4657.dir/main.cpp.o: In function `main':
/home/idanas/CLionProjects/Switcheroo/main.cpp:17: undefined reference to
`webkit_web_view_get_type'
/home/idanas/CLionProjects/Switcheroo/main.cpp:17: undefined reference to
`webkit_web_view_new'
/home/idanas/CLionProjects/Switcheroo/main.cpp:29: undefined reference to
`webkit_web_view_load_uri'
collect2: error: ld returned 1 exit status
CMakeFiles/CVE_2016_4657.dir/build.make:94: recipe for target
'CVE_2016_4657' failed
make[3]: *** [CVE_2016_4657] Error 1
CMakeFiles/Makefile2:67: recipe for target
'CMakeFiles/CVE_2016_4657.dir/all' failed
make[2]: *** [CMakeFiles/CVE_2016_4657.dir/all] Error 2
CMakeFiles/Makefile2:79: recipe for target
'CMakeFiles/CVE_2016_4657.dir/rule' failed
make[1]: *** [CMakeFiles/CVE_2016_4657.dir/rule] Error 2
Makefile:118: recipe for target 'CVE_2016_4657' failed
make: *** [CVE_2016_4657] Error 2
I have little-to-none experience with CMake and could really use some help.
You are trying to use WebKitGTK+, which is a separate library from both GTK+ and libsoup. You will need to duplicate your pkg_check_modules() code again for WebKitGTK+. You'll need to determine first if you are using WebKit1 or WebKit2 (they have subtly different APIs), and then find the appropriate pkg-config name for that version of WebKitGTK+; check the documentation and the contents of your /usr/lib/pkgconfig directory.