CMake adding opencv

Question

I'm trying to include opencv2.4.9 with cmake:

cmake_minimum_required(VERSION 2.8.3)
project(HydroCamel)
SET(CMAKE_CXX_FLAGS "-lpthread")
find_package(catkin REQUIRED COMPONENTS
  roscpp
  rospy
  std_msgs
)
catkin_package()
set(SRC_FOLDER src/src)
set(ALOGS_FOLDER src/Algos)
set(ALOGS_UTILS_FOLDER src/Algos/Utils)
set(SRC_INCLUDE_FOLDER src/include)
set(DIRS ${SRC_FOLDER} ${ALOGS_FOLDER} ${ALOGS_UTILS_FOLDER} ${SRC_INCLUDE_FOLDER})
include_directories(${DIRS})

file(GLOB_RECURSE SRC_FILES "*.h" "*.cpp")
include_directories(include ${catkin_INCLUDE_DIRS})

set(Boost_USE_STATIC_LIBS OFF) 
set(Boost_USE_MULTITHREADED ON)  
set(Boost_USE_STATIC_RUNTIME OFF) 
find_package(Boost 1.55.0 COMPONENTS filesystem system thread)
#FIND_PACKAGE(OpenCV REQUIRED core imgproc highgui)
include_directories(${OpenCV_INCLUDE_DIRS})
if(Boost_FOUND)
    include_directories(${Boost_INCLUDE_DIRS}) 
    add_executable(SourceFiles ${SRC_FILES})
    TARGET_LINK_LIBRARIES(SourceFiles ${Boost_LIBRARIES})
    TARGET_LINK_LIBRARIES(SourceFiles ${OpenCV_LIBS})
endif()

And I receive this error:

CMake Error at HydroCamel/CMakeLists.txt:28 (find_package): Found package configuration file:
/home/jdorfsman/opencv-2.4.9/build/OpenCVConfig.cmake
but it set OpenCV_FOUND to FALSE so package "OpenCV" is considered to be NOT FOUND.

-- Configuring incomplete, errors occurred! See also "/home/jdorfsman/catkin_ws/build/CMakeFiles/CMakeOutput.log". See also "/home/jdorfsman/catkin_ws/build/CMakeFiles/CMakeError.log".

This is the CMakeError.log file:

Determining if the pthread_create exist failed with the following output:
Change Dir: /home/jdorfsman/catkin_ws/build/CMakeFiles/CMakeTmp

Run Build Command:/usr/bin/make "cmTryCompileExec1061744568/fast"
/usr/bin/make -f CMakeFiles/cmTryCompileExec1061744568.dir/build.make CMakeFiles/cmTryCompileExec1061744568.dir/build
make[1]: Entering directory `/home/jdorfsman/catkin_ws/build/CMakeFiles/CMakeTmp'
/usr/bin/cmake -E cmake_progress_report /home/jdorfsman/catkin_ws/build/CMakeFiles/CMakeTmp/CMakeFiles 1
Building C object CMakeFiles/cmTryCompileExec1061744568.dir/CheckSymbolExists.c.o
/usr/bin/cc    -o CMakeFiles/cmTryCompileExec1061744568.dir/CheckSymbolExists.c.o   -c /home/jdorfsman/catkin_ws/build/CMakeFiles/CMakeTmp/CheckSymbolExists.c
Linking C executable cmTryCompileExec1061744568
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTryCompileExec1061744568.dir/link.txt --verbose=1
/usr/bin/cc       CMakeFiles/cmTryCompileExec1061744568.dir/CheckSymbolExists.c.o  -o cmTryCompileExec1061744568 -rdynamic 
CMakeFiles/cmTryCompileExec1061744568.dir/CheckSymbolExists.c.o: In function `main':
CheckSymbolExists.c:(.text+0x16): undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status
make[1]: *** [cmTryCompileExec1061744568] Error 1
make[1]: Leaving directory `/home/jdorfsman/catkin_ws/build/CMakeFiles/CMakeTmp'
make: *** [cmTryCompileExec1061744568/fast] Error 2

File /home/jdorfsman/catkin_ws/build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
/* */
#include <pthread.h>

int main(int argc, char** argv)
{
  (void)argv;
#ifndef pthread_create
  return ((int*)(&pthread_create))[argc];
#else
  (void)argc;
  return 0;
#endif
}

Determining if the function pthread_create exists in the pthreads failed with the following output:
Change Dir: /home/jdorfsman/catkin_ws/build/CMakeFiles/CMakeTmp

Run Build Command:/usr/bin/make "cmTryCompileExec3426763052/fast"
/usr/bin/make -f CMakeFiles/cmTryCompileExec3426763052.dir/build.make CMakeFiles/cmTryCompileExec3426763052.dir/build
make[1]: Entering directory `/home/jdorfsman/catkin_ws/build/CMakeFiles/CMakeTmp'
/usr/bin/cmake -E cmake_progress_report /home/jdorfsman/catkin_ws/build/CMakeFiles/CMakeTmp/CMakeFiles 1
Building C object CMakeFiles/cmTryCompileExec3426763052.dir/CheckFunctionExists.c.o
/usr/bin/cc   -DCHECK_FUNCTION_EXISTS=pthread_create   -o CMakeFiles/cmTryCompileExec3426763052.dir/CheckFunctionExists.c.o   -c /usr/share/cmake-2.8/Modules/CheckFunctionExists.c
Linking C executable cmTryCompileExec3426763052
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTryCompileExec3426763052.dir/link.txt --verbose=1
/usr/bin/cc   -DCHECK_FUNCTION_EXISTS=pthread_create    CMakeFiles/cmTryCompileExec3426763052.dir/CheckFunctionExists.c.o  -o cmTryCompileExec3426763052 -rdynamic -lpthreads 
/usr/bin/ld: cannot find -lpthreads
collect2: error: ld returned 1 exit status
make[1]: *** [cmTryCompileExec3426763052] Error 1
make[1]: Leaving directory `/home/jdorfsman/catkin_ws/build/CMakeFiles/CMakeTmp'
make: *** [cmTryCompileExec3426763052/fast] Error 2

See the .log files as the error message suggest. Maybe these instructions can help you. — karlphillip
What happens if you set the environment variable OpenCV_DIR by doing something like export OpenCV_DIR=/home/jdorfsman/opencv-2.4.9/build, revome the set(OpenCV_DIR...) and re-run cmake ? stackoverflow.com/questions/9846171/… — francis
Same thing sadly. Found package configuration file: /home/jdorfsman/opencv-2.4.9/build/OpenCVConfig.cmake but it set OpenCV_FOUND to FALSE so package "OpenCV" is considered to be NOT FOUND. — Javi
@karlphillip I saw the log message, and also saw the link you refer me to, sadly it isn't the same error and the log didn't helped much. I'll add it to the question in case it helps.. — Javi
Not sure why it is looking for pthreads instead of pthread. Can you try setting OpenCV_DIR to OpenCV install directory and not the build directory. I mean set it to path where make install copied the built libraries. — kiranpradeep

qqibrow qqibrow · Accepted Answer · 2015-01-14T23:26:22

Looks like you don't specify the pthread flag.

CMakeFiles/cmTryCompileExec1061744568.dir/CheckSymbolExists.c.o: In function `main':
CheckSymbolExists.c:(.text+0x16): undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status
make[1]: *** [cmTryCompileExec1061744568] Error 1
make[1]: Leaving directory `/home/jdorfsman/catkin_ws/build/CMakeFiles/CMakeTmp'
make: *** [cmTryCompileExec1061744568/fast] Error 2

try add:

SET(CMAKE_CXX_FLAGS "-lpthread")

CMake adding opencv

1 Answers