I'm trying to use OpenCV and LibTorch in the same project. Libtorch is installed in /usr/include/libtorch, downloaded from the PyTorch website. I'm using the cxx11 ABI version for CUDA 11.3.
Here's my CMakeLists.txt file:
cmake_minimum_required(VERSION 3.23 FATAL_ERROR)
project(chess-rl VERSION 1.0)
find_package( OpenCV REQUIRED )
set(CMAKE_PREFIX_PATH /usr/include/libtorch/share/cmake/)
find_package(Torch REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})
include_directories(${OpenCV_LIBS})
include_directories(${TORCH_INCLUDE_DIRS})
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${TORCH_CXX_FLAGS}")
file (GLOB SOURCE_FILES
${PROJECT_SOURCE_DIR}/src/*.cc
${PROJECT_SOURCE_DIR}/src/chess/*.cc
)
add_executable(${PROJECT_NAME} ${SOURCE_FILES})
target_link_libraries(${PROJECT_NAME} ${OpenCV_LIBS} "${TORCH_LIBRARIES}" )
set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 20)
The program has a #include <opencv2/opencv.hpp> line at the top.
Compilation works fine, but running the executable gives me this error:
/usr/include/libtorch/lib/libgomp-52f2fd74.so.1: version `GOMP_5.0' not found (required by /usr/lib/libvtkCommonCore.so.1)
I believe libtorch is trying to use a library that is incompatible with OpenCV.
If I run the program with LD_PRELOAD=/usr/lib/libgomp.so ./build/my-program, it runs fine.
How can I fix this error without having to use that environment variable? Is there a way to link that particular library in CMake?
I faced the same problem, and your thread contributed to one solution.
You need to add a shared library in your CMakelists.txt file.
add_library(libName SHARED IMPORTED)
set_property(TARGET libName PROPERTY IMPORTED_LOCATION "/usr/lib/libgomp.so")
target_link_libraries(PROJECT_NAME
libName)
I hope I could help you
With kind regards
Related
I'm operating under a new learning curve here with c++ and using CMake in Visual Studio. Here is the partial code up until the point where I receive the error:
project(libfranka
VERSION 0.8.0
LANGUAGES CXX
)
list(INSERT CMAKE_MODULE_PATH 0 ${CMAKE_SOURCE_DIR}/cmake)
set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
if(MSVC)
add_compile_options(/W0)
else()
add_compile_options(-Wall -Wextra)
endif()
set(THIRDPARTY_SOURCES_DIR "${CMAKE_SOURCE_DIR}/3rdparty" CACHE PATH
"Directory for third-party sources")
## Dependencies
find_package(Poco REQUIRED COMPONENTS Net Foundation)
find_package(Eigen3 REQUIRED)
Once it hits the first find_package is where I encounter the error:
Here is the code within FindPoco.cmake.
find_package(Poco COMPONENTS ${Poco_FIND_COMPONENTS} CONFIG QUIET)
if(Poco_FOUND)
return()
endif()
find_path(Poco_INCLUDE_DIR Poco/Poco.h)
mark_as_advanced(FORCE Poco_INCLUDE_DIR)
foreach(component ${Poco_FIND_COMPONENTS})
set(component_var "Poco_${component}_LIBRARY")
find_library(${component_var} Poco${component})
mark_as_advanced(FORCE ${component_var})
if(${component_var})
set(Poco_${component}_FOUND TRUE)
list(APPEND Poco_LIBRARIES ${component})
if(NOT TARGET Poco::${component})
add_library(Poco::${component} SHARED IMPORTED)
set_target_properties(Poco::${component} PROPERTIES
INTERFACE_INCLUDE_DIRECTORIES ${Poco_INCLUDE_DIR}
IMPORTED_LOCATION ${${component_var}}
)
endif()
endif()
endforeach()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Poco
FOUND_VAR Poco_FOUND
REQUIRED_VARS Poco_INCLUDE_DIR Poco_LIBRARIES
VERSION_VAR Poco_VERSION
HANDLE_COMPONENTS
)
I installed poco using vcpkg in a directory titled vcpkg. Within the vcpkg directory is the libfranka directory, which houses the CMakeLists.txt file that I compile in Visual Studio. Here is an image of that directory:
Finally, here is the tutorial that I am using: https://frankaemika.github.io/docs/installation_windows.html#building-from-source
EDIT:
Per the link I followed the instructions for solving the build dependencies and here is an image of that:
Then I ran the CMakeLists.txt again and in the CMake Settings this is what I see:
Note also that I ran through the install of poco again and I noticed this and am unsure if it could be the source of the problem or if it means nothing (again, this was the out put after running vcpkg install poco):
After this I still receive the same error.
Does anyone see what it is that I am doing incorrectly?
Thank you!
I am trying to compile openGL file including "png.h" header file,
I got the following error:
Open GL version 2.1 ATI-3.2.24
libpng warning: Application built with libpng-1.4.12 but running with 1.6.37
error: png_create_read_struct returned 0.
Failed to read image texture from ../images/ceramic.png
My Cmakelists.txt file :
cmake_minimum_required (VERSION 3.13)
project (teapot)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
find_package(OpenGL REQUIRED)
find_package(GLUT REQUIRED)
find_package(PNG REQUIRED)
include_directories(${PNG_INCLUDE_DIR})
add_executable(teapot teapot.cpp)
target_link_libraries(teapot ${OPENGL_gl_LIBRARY} ${GLUT_LIBRARIES} ${PNG_LIBRARIES} )
set(CMAKE_CXX_FLAGS "-I ${CMAKE_OSX_SYSROOT} ${CMAKE_CXX_FLAGS} -std=c++11")
if (APPLE)
set (CMAKE_CXX_FLAGS "-Wno-deprecated-declarations ${CMAKE_CXX_FLAGS}")
endif ()
set_target_properties(teapot PROPERTIES
CXX_STANDARD 11
CXX_STANDARD_REQUIRED YES
CXX_EXTENSIONS NO
)
cmake . works fine, but when I execute ./teapot the above error occurred. Thanks for any help!
You've probably only have development libraries installed for libpng-1.4.12 and not for libpng-1.6.37 or some other "non-standard" installation.
But the message seems pretty clear you linked against an older version but have a newer version in the runtime path of loadable libraries.
find_package(PNG REQUIRED) is only going to search the "standard" locations via find_library().
You may also want to update your CMakeLists.txt file to use target_link_libraries( ... PNG::PNG). This is simpler than trying to use the PNG variables that get set; which is missing PNG_DEFINITIONS when compiling your project. Refer to the CMake manual buildsystem section about library targets.
You can inspect the variables by using the message() command to print out their values. Some of them will also be stored in CMakeCache.txt.
If libpng isn't in the standard locations then you have to use target_link_libraries( ... /path/to/lib) and target_include_directories( ... /path/to/lib/headers), etcetera to handle it.
I used this link to install OpenCV.
What works:
1.OpenCV works fine with python (running from terminal).
2.I can import opencv libraries in a single C++ program.
What does not work :
When the code is spread across multiple and you need to build it using CMake.
Here's my CmakeLists.txt :
1.cmake_minimum_required(VERSION 3.9)
2.project(Image_processing)
3.set(CMAKE_CXX_STANDARD 14)
4.find_package(OpenCV REQUIRED)
5.include_directories(/home/user/opencv/build)
6.add_executable(main main.cpp)
7.target_link_libraries(project_name ${OpenCV_LIBS})
Errors (can regenerate them by commenting lines 4,5 and 7 in above CMake file):
undefined reference to OpenCV functions.
CMake Error at CMakeLists.txt:7 (target_link_libraries):
Cannot specify link libraries for target "Image_processing" which is not
built by this project.
Correct it with:
cmake_minimum_required(VERSION 3.5)
project(Image_processing)
set(CMAKE_CXX_STANDARD 14)
find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})
add_executable(main main.cpp)
target_link_libraries(main ${OpenCV_LIBS})
In your CMakeLists.txt, the exe-name is not matching with the target-link-name. I modify the line, then it works on my PC.
The CMakeLists.txt of an OpenCV Project:
cmake_minimum_required(VERSION 3.5)
project(Image_processing)
set(CMAKE_CXX_STANDARD 14)
find_package(OpenCV REQUIRED)
#include_directories(/home/user/opencv/build)
add_executable(Image_processing main.cpp)
target_link_libraries(Image_processing ${OpenCV_LIBS})
I'm looking for the simplest way to compile a c++ program using SDL2 and SDL_image with cmake.
Here is my best attempt, after hours of searching:
CMakeLists.txt
project(shooter-cmake2)
cmake_minimum_required(VERSION 2.8)
set(SOURCES
shooter.cpp
classes.cpp
utils.cpp
)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
add_executable(${PROJECT_NAME} ${SOURCES})
INCLUDE(FindPkgConfig)
PKG_SEARCH_MODULE(SDL2 REQUIRED sdl2)
PKG_SEARCH_MODULE(SDL2_image REQUIRED sdl2_image)
INCLUDE_DIRECTORIES(${SDL2_INCLUDE_DIRS} ${SDL2IMAGE_INCLUDE_DIR})
TARGET_LINK_LIBRARIES(${PROJECT_NAME} ${SDL2_LIBRARIES} ${SDL2IMAGE_LIBRARY})
I get these errors:
In function `loadTexture(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, SDL_Renderer*)':
undefined reference to `IMG_LoadTexture'
collect2: ld returned 1 exit status
Here is the function call:
#include "SDL.h"
#include "SDL_image.h"
SDL_Texture* loadTexture(const std::string &file, SDL_Renderer *ren){
SDL_Texture *texture = IMG_LoadTexture(ren, file.c_str());
texture != nullptr or die("LoadTexture");
return texture;
}
I think that the following will work, as it finds the libraries on my ubuntu system and the example function you provided can link:
project(shooter-cmake2)
cmake_minimum_required(VERSION 2.8)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
add_executable(${PROJECT_NAME} src/test.cpp)
INCLUDE(FindPkgConfig)
PKG_SEARCH_MODULE(SDL2 REQUIRED sdl2)
PKG_SEARCH_MODULE(SDL2IMAGE REQUIRED SDL2_image>=2.0.0)
INCLUDE_DIRECTORIES(${SDL2_INCLUDE_DIRS} ${SDL2IMAGE_INCLUDE_DIRS})
TARGET_LINK_LIBRARIES(${PROJECT_NAME} ${SDL2_LIBRARIES} ${SDL2IMAGE_LIBRARIES})
If cmake is executed with --debug-output it outputs:
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.26")
Called from: [2] /usr/share/cmake-2.8/Modules/FindPkgConfig.cmake
[1] $USER/stack-overflow/cmake-sdl2-image/CMakeLists.txt
-- checking for one of the modules 'sdl2'
Called from: [1] $USER/stack-overflow/cmake-sdl2-image/CMakeLists.txt
-- checking for one of the modules 'SDL2_image>=2.0.0'
Called from: [1] $USER/stack-overflow/cmake-sdl2-image/CMakeLists.txt
This made me check the contents of
/usr/lib/x86_64-linux-gnu/pkgconfig/sdl2.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/SDL2_image.pc
I noticed that SDL2_image.pc contains
Name: SDL2_image
which I assumed should match the third parameter to PKG_SEARCH_MODULE for this library.
There are two blog posts about this here:
Using SDL2 with CMake
Using SDL2_image with CMake
Basically you need a FindSDL2.cmake and FindSDL2_image.cmake module. They can be based of the ones that work for SDL 1.2 which are included in CMake already. Using these Find modules will also work on Windows.
If you are on Linux and only need SDL2 you don't even need the FindSDL2.cmake as the following already works:
cmake_minimum_required(VERSION 3.7)
project(SDL2Test)
find_package(SDL2 REQUIRED)
include_directories(${SDL2_INCLUDE_DIRS})
add_executable(SDL2Test Main.cpp)
target_link_libraries(SDL2Test ${SDL2_LIBRARIES})
I was having trouble with these answers, I think cmake changed the way to import targets. Following #trenki blog post I needed to change my CMakeLists.txt to:
project(SDL2Test)
find_package(SDL2 REQUIRED COMPONENTS SDL2::SDL2)
add_executable(SDL2Test main.cpp)
target_link_libraries(SDL2Test SDL2::SDL2)
Currently this works out of the box on Arch Linux.
I introduced a modern and portable approach for linking to the SDL2, SDL2_image. These SDL2 CMake modules let you build an SDL2 & SDL2_image project as follows :
list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/sdl2)
find_package(SDL2 REQUIRED)
find_package(SDL2_image REQUIRED)
target_link_libraries(${PROJECT_NAME} SDL2::Main SDL2::Image)
You should just clone the repo in your project:
git clone https://github.com/aminosbh/sdl2-cmake-modules cmake/sdl2
Note: If CMake didn't find the SDL2/SDL2_image libraries (in Windows), we can specify the CMake options SDL2_PATH and SDL2_IMAGE_PATH as follows:
cmake .. -DSDL2_PATH="/path/to/sdl2" -DSDL2_IMAGE_PATH="/path/to/sdl2-image"
It supports also other related libraries : SDL2_ttf, SDL2_net, SDL2_mixer and SDL2_gfx. For more details, please read the README.md file.
You can find a list of examples/samples and projects that uses these modules here : https://github.com/aminosbh/sdl-samples-and-projects
Since 2.6 version, SDL2_image installation is shipped with CMake config script SDL2_imageConfig.cmake/SDL2_image-config.cmake.
So find_package(SDL2_image) works without any additional FindSDL2_image.cmake module, and creates IMPORTED target SDL2_image::SDL2_image:
find_package(SDL2_image REQUIRED)
target_link_libraries(<executable-target> SDL2_image::SDL2_image)
Note, that variables like SDL2_IMAGE_LIBRARIES or SDL2_IMAGE_INCLUDE_DIRS are NOT set in this case, so using them is meaningless.
The following commands works fine for me:
set(SDL_INCLUDE_DIR "/usr/include/SDL2")
set(SDL_LIBRARY "SDL2")
include(FindSDL)
if(SDL_FOUND)
message(STATUS "SDL FOUND")
endif()
I'm looking for the simplest way to compile a c++ program using SDL2 and SDL_image with cmake.
Here is my best attempt, after hours of searching:
CMakeLists.txt
project(shooter-cmake2)
cmake_minimum_required(VERSION 2.8)
set(SOURCES
shooter.cpp
classes.cpp
utils.cpp
)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
add_executable(${PROJECT_NAME} ${SOURCES})
INCLUDE(FindPkgConfig)
PKG_SEARCH_MODULE(SDL2 REQUIRED sdl2)
PKG_SEARCH_MODULE(SDL2_image REQUIRED sdl2_image)
INCLUDE_DIRECTORIES(${SDL2_INCLUDE_DIRS} ${SDL2IMAGE_INCLUDE_DIR})
TARGET_LINK_LIBRARIES(${PROJECT_NAME} ${SDL2_LIBRARIES} ${SDL2IMAGE_LIBRARY})
I get these errors:
In function `loadTexture(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, SDL_Renderer*)':
undefined reference to `IMG_LoadTexture'
collect2: ld returned 1 exit status
Here is the function call:
#include "SDL.h"
#include "SDL_image.h"
SDL_Texture* loadTexture(const std::string &file, SDL_Renderer *ren){
SDL_Texture *texture = IMG_LoadTexture(ren, file.c_str());
texture != nullptr or die("LoadTexture");
return texture;
}
I think that the following will work, as it finds the libraries on my ubuntu system and the example function you provided can link:
project(shooter-cmake2)
cmake_minimum_required(VERSION 2.8)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
add_executable(${PROJECT_NAME} src/test.cpp)
INCLUDE(FindPkgConfig)
PKG_SEARCH_MODULE(SDL2 REQUIRED sdl2)
PKG_SEARCH_MODULE(SDL2IMAGE REQUIRED SDL2_image>=2.0.0)
INCLUDE_DIRECTORIES(${SDL2_INCLUDE_DIRS} ${SDL2IMAGE_INCLUDE_DIRS})
TARGET_LINK_LIBRARIES(${PROJECT_NAME} ${SDL2_LIBRARIES} ${SDL2IMAGE_LIBRARIES})
If cmake is executed with --debug-output it outputs:
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.26")
Called from: [2] /usr/share/cmake-2.8/Modules/FindPkgConfig.cmake
[1] $USER/stack-overflow/cmake-sdl2-image/CMakeLists.txt
-- checking for one of the modules 'sdl2'
Called from: [1] $USER/stack-overflow/cmake-sdl2-image/CMakeLists.txt
-- checking for one of the modules 'SDL2_image>=2.0.0'
Called from: [1] $USER/stack-overflow/cmake-sdl2-image/CMakeLists.txt
This made me check the contents of
/usr/lib/x86_64-linux-gnu/pkgconfig/sdl2.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/SDL2_image.pc
I noticed that SDL2_image.pc contains
Name: SDL2_image
which I assumed should match the third parameter to PKG_SEARCH_MODULE for this library.
There are two blog posts about this here:
Using SDL2 with CMake
Using SDL2_image with CMake
Basically you need a FindSDL2.cmake and FindSDL2_image.cmake module. They can be based of the ones that work for SDL 1.2 which are included in CMake already. Using these Find modules will also work on Windows.
If you are on Linux and only need SDL2 you don't even need the FindSDL2.cmake as the following already works:
cmake_minimum_required(VERSION 3.7)
project(SDL2Test)
find_package(SDL2 REQUIRED)
include_directories(${SDL2_INCLUDE_DIRS})
add_executable(SDL2Test Main.cpp)
target_link_libraries(SDL2Test ${SDL2_LIBRARIES})
I was having trouble with these answers, I think cmake changed the way to import targets. Following #trenki blog post I needed to change my CMakeLists.txt to:
project(SDL2Test)
find_package(SDL2 REQUIRED COMPONENTS SDL2::SDL2)
add_executable(SDL2Test main.cpp)
target_link_libraries(SDL2Test SDL2::SDL2)
Currently this works out of the box on Arch Linux.
I introduced a modern and portable approach for linking to the SDL2, SDL2_image. These SDL2 CMake modules let you build an SDL2 & SDL2_image project as follows :
list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/sdl2)
find_package(SDL2 REQUIRED)
find_package(SDL2_image REQUIRED)
target_link_libraries(${PROJECT_NAME} SDL2::Main SDL2::Image)
You should just clone the repo in your project:
git clone https://github.com/aminosbh/sdl2-cmake-modules cmake/sdl2
Note: If CMake didn't find the SDL2/SDL2_image libraries (in Windows), we can specify the CMake options SDL2_PATH and SDL2_IMAGE_PATH as follows:
cmake .. -DSDL2_PATH="/path/to/sdl2" -DSDL2_IMAGE_PATH="/path/to/sdl2-image"
It supports also other related libraries : SDL2_ttf, SDL2_net, SDL2_mixer and SDL2_gfx. For more details, please read the README.md file.
You can find a list of examples/samples and projects that uses these modules here : https://github.com/aminosbh/sdl-samples-and-projects
Since 2.6 version, SDL2_image installation is shipped with CMake config script SDL2_imageConfig.cmake/SDL2_image-config.cmake.
So find_package(SDL2_image) works without any additional FindSDL2_image.cmake module, and creates IMPORTED target SDL2_image::SDL2_image:
find_package(SDL2_image REQUIRED)
target_link_libraries(<executable-target> SDL2_image::SDL2_image)
Note, that variables like SDL2_IMAGE_LIBRARIES or SDL2_IMAGE_INCLUDE_DIRS are NOT set in this case, so using them is meaningless.
The following commands works fine for me:
set(SDL_INCLUDE_DIR "/usr/include/SDL2")
set(SDL_LIBRARY "SDL2")
include(FindSDL)
if(SDL_FOUND)
message(STATUS "SDL FOUND")
endif()