Merge pull request #25832 from chachoi-world:4.x

Add support for QNX #25832

Build and test instruction for QNX:
https://github.com/chachoi-world/qnx-ports/blob/main/opencv/README.md

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [ ] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake

modules/core/include/opencv2/core/utils/filesystem.private.hpp

@@ -13,7 +13,7 @@
      /* not supported */
 #  elif defined __ANDROID__ || defined __linux__ || defined _WIN32 || \
         defined __FreeBSD__ || defined __bsdi__ || defined __HAIKU__ || \
-        defined __GNU__
+        defined __GNU__ || defined __QNX__
 #      define OPENCV_HAVE_FILESYSTEM_SUPPORT 1
 #  elif defined(__APPLE__)
 #    include <TargetConditionals.h>

modules/core/src/parallel.cpp

@@ -72,6 +72,10 @@
     #endif
 #endif
 
+#if defined (__QNX__)
+    #include <sys/syspage.h>
+#endif
+
 #ifndef OPENCV_DISABLE_THREAD_SUPPORT
     #include <thread>
 #endif
@@ -1011,7 +1015,9 @@ int getNumberOfCPUs_()
 
     static unsigned cpu_count_sysconf = (unsigned)sysconf( _SC_NPROCESSORS_ONLN );
     ncpus = minNonZero(ncpus, cpu_count_sysconf);
-
+#elif defined (__QNX__)
+    static unsigned cpu_count_sysconf = _syspage_ptr->num_cpu;
+    ncpus = minNonZero(ncpus, cpu_count_sysconf);
 #endif
 
     return ncpus != 0 ? ncpus : 1;

modules/core/src/system.cpp

@@ -46,6 +46,15 @@
 #include <iostream>
 #include <ostream>
 
+#ifdef __QNX__
+    #include <unistd.h>
+    #include <sys/neutrino.h>
+    #include <sys/syspage.h>
+#ifdef __aarch64__
+    #include <aarch64/syspage.h>
+#endif
+#endif
+
 #include <opencv2/core/utils/configuration.private.hpp>
 #include <opencv2/core/utils/trace.private.hpp>
 

modules/core/src/utils/filesystem.cpp

@@ -34,7 +34,7 @@
 #include <errno.h>
 #include <io.h>
 #include <stdio.h>
-#elif defined __linux__ || defined __APPLE__ || defined __HAIKU__ || defined __FreeBSD__ || defined __GNU__ || defined __EMSCRIPTEN__
+#elif defined __linux__ || defined __APPLE__ || defined __HAIKU__ || defined __FreeBSD__ || defined __GNU__ || defined __EMSCRIPTEN__ || defined __QNX__
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -194,7 +194,7 @@ cv::String getcwd()
     sz = GetCurrentDirectoryA((DWORD)buf.size(), buf.data());
     return cv::String(buf.data(), (size_t)sz);
 #endif
-#elif defined __linux__ || defined __APPLE__ || defined __HAIKU__ || defined __FreeBSD__ || defined __EMSCRIPTEN__
+#elif defined __linux__ || defined __APPLE__ || defined __HAIKU__ || defined __FreeBSD__ || defined __EMSCRIPTEN__ || defined __QNX__
     for(;;)
     {
         char* p = ::getcwd(buf.data(), buf.size());
@@ -228,7 +228,7 @@ bool createDirectory(const cv::String& path)
 #else
     int result = _mkdir(path.c_str());
 #endif
-#elif defined __linux__ || defined __APPLE__ || defined __HAIKU__ || defined __FreeBSD__ || defined __EMSCRIPTEN__
+#elif defined __linux__ || defined __APPLE__ || defined __HAIKU__ || defined __FreeBSD__ || defined __EMSCRIPTEN__ || defined __QNX__
     int result = mkdir(path.c_str(), 0777);
 #else
     int result = -1;
@@ -343,7 +343,7 @@ private:
     Impl& operator=(const Impl&); // disabled
 };
 
-#elif defined __linux__ || defined __APPLE__ || defined __HAIKU__ || defined __FreeBSD__ || defined __GNU__ || defined __EMSCRIPTEN__
+#elif defined __linux__ || defined __APPLE__ || defined __HAIKU__ || defined __FreeBSD__ || defined __GNU__ || defined __EMSCRIPTEN__ || defined __QNX__
 
 struct FileLock::Impl
 {

modules/ts/src/ts.cpp

@@ -1035,7 +1035,8 @@ static std::string findData(const std::string& relative_path, bool required, boo
         }
     }
 #ifdef OPENCV_TEST_DATA_INSTALL_PATH
-    datapath = path_join("./", OPENCV_TEST_DATA_INSTALL_PATH);
+    datapath = OPENCV_TEST_DATA_INSTALL_PATH;
+
     if (isDirectory(datapath))
     {
         for(size_t i = search_subdir.size(); i > 0; i--)