[ 2%] Processing OpenCL kernels (core)
[ 2%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/algorithm.cpp.obj
In file included from C:/cygwin64/home/Raivo/opencv-4.6.0/modules/core/src/precomp.hpp:53,
from C:/cygwin64/home/Raivo/opencv-4.6.0/modules/core/src/algorithm.cpp:43:
C:/cygwin64/home/Raivo/opencv-4.6.0/modules/core/include/opencv2/core/utility.hpp:718:14: error: ‘recursive_mutex’ in namespace ‘std’ does not name a type
718 | typedef std::recursive_mutex Mutex;
| ^~~~~~~~~~~~~~~
C:/cygwin64/home/Raivo/opencv-4.6.0/modules/core/include/opencv2/core/utility.hpp:63:1: note: ‘std::recursive_mutex’ is defined in header ‘’; did you forget to ‘#include ’?
62 | #include // std::mutex, std::lock_guard
+++ |+#include
63 | #endif
C:/cygwin64/home/Raivo/opencv-4.6.0/modules/core/include/opencv2/core/utility.hpp:719:29: error: ‘Mutex’ is not a member of ‘cv’
719 | typedef std::lock_guardcv::Mutex AutoLock;
| ^~~~~
C:/cygwin64/home/Raivo/opencv-4.6.0/modules/core/include/opencv2/core/utility.hpp:719:29: error: ‘Mutex’ is not a member of ‘cv’
C:/cygwin64/home/Raivo/opencv-4.6.0/modules/core/include/opencv2/core/utility.hpp:719:34: error: template argument 1 is invalid
719 | typedef std::lock_guardcv::Mutex AutoLock;
| ^
In file included from C:/cygwin64/home/Raivo/opencv-4.6.0/modules/core/src/algorithm.cpp:43:
C:/cygwin64/home/Raivo/opencv-4.6.0/modules/core/src/precomp.hpp:369:5: error: ‘Mutex’ in namespace ‘cv’ does not name a type
369 | cv::Mutex& getInitializationMutex();
| ^~~~~
make[2]: *** [modules/core/CMakeFiles/opencv_core.dir/build.make:104: modules/core/CMakeFiles/opencv_core.dir/src/algorithm.cpp.obj] Error 1
make[1]: *** [CMakeFiles/Makefile2:1807: modules/core/CMakeFiles/opencv_core.dir/all] Error 2
make: *** [Makefile:166: all] Error 2
please DONT use cygwin for this.
you need a different mingw(64) g++, built with posix threads
(so it has the missing mutex / threads headers)
Thank for assistants !
I am using now Eclipse IDE with simple program with opencv and got similar errors errors
| Description | Resource | Path | Location | Type |
|---|---|---|---|---|
| ‘Mutex’ is not a member of ‘cv’ | first | line 719, external location: C:\Users\Raivo\opencv\build\include\opencv2\core\utility.hpp | C/C++ Problem | |
| ‘recursive_mutex’ in namespace ‘std’ does not name a type | first | line 718, external location: C:\Users\Raivo\opencv\build\include\opencv2\core\utility.hpp | C/C++ Problem |
wrong compiler, again …
also, you will have to disable WITH_MSMF and WITH_OBSSENSOR
(NO version of mingw has supporting code for this !)
Thank You, I changed in eclipse buid type and insted of cross compiler I use minGV, but i Got new errors
| Description | Resource | Path | Location | Type |
|---|---|---|---|---|
| Function ‘waitKey’ could not be resolved | second.cpp | /second/src | line 39 | Semantic Error |
| Symbol ‘cv’ could not be resolved | second.cpp | /second/src | line 13 | Semantic Error |
| Type ‘Mat’ could not be resolved | second.cpp | /second/src | line 27 | Semantic Error |
Code looks like -
#include “opencv2/imgcodecs.hpp”
#include “opencv2/highgui.hpp”
#include
using namespace cv;
and where to set these variables also, you will have to disable WITH_MSMF and WITH_OBSSENSOR
(NO version of mingw has supporting code for this !)
cmake options for building the opencv libs
add:
#include “opencv2/opencv.hpp"
i’ve NO idea, what you did there.
however, all those are compiler errors, you probably need to fix your include path
assuming, you did a proper make install (DID YOU ?), that should be:
c:/wherever/opencv/is/build/install/opencv2/include
please NO screenshots from your ide (entirely useless)
if you meant a binary release – those libs are only usable for VS compiler.
if you want to use mingw, you MUST build from src
FIrstly I used Visual Studio, but I got following error at runtime.
Project1.exe - System Error
The code execution cannot proceed because opencv_world460.dll was not found. Reinstalling the program may fix this problem.
OK
I rebuil opncv 4.6 and 4.7 from sources but same error occure.
What’s wron with me ?
folder containing this dll must be on the PATH, so the exe can find it at runtime
Thank You very much ! All works now
you’re too lazy to even spellcheck ‘wrong’
You have the patience of a saint! 
I have 1 question more. Is it possible to set opencv install building from sources with VIsual Studio in this way that it doesn’t makes the tests
there are BUILD_TESTS=OFF and BUILD_PERF_TESTS=OFF
cmake options
How can I set them. I’m novice in cmake