Enable file system on Emscripten

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

@@ -12,7 +12,7 @@
 
 #if defined(_WIN32)
 #include <windows.h>
-#elif defined(__linux__) || defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__HAIKU__) || defined(__GLIBC__)
+#elif defined(__linux__) || defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__HAIKU__) || defined(__GLIBC__) || defined(__EMSCRIPTEN__)
 #include <dlfcn.h>
 #endif
 
@@ -65,7 +65,7 @@ void* getSymbol_(LibHandle_t h, const char* symbolName)
 {
 #if defined(_WIN32)
     return (void*)GetProcAddress(h, symbolName);
-#elif defined(__linux__) || defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__HAIKU__) || defined(__GLIBC__)
+#elif defined(__linux__) || defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__HAIKU__) || defined(__GLIBC__) || defined(__EMSCRIPTEN__)
     return dlsym(h, symbolName);
 #endif
 }
@@ -79,7 +79,7 @@ LibHandle_t libraryLoad_(const FileSystemPath_t& filename)
 # else
     return LoadLibraryW(filename.c_str());
 #endif
-#elif defined(__linux__) || defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__HAIKU__) || defined(__GLIBC__)
+#elif defined(__linux__) || defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__HAIKU__) || defined(__GLIBC__) || defined(__EMSCRIPTEN__)
     void* handle = dlopen(filename.c_str(), RTLD_NOW);
     CV_LOG_IF_DEBUG(NULL, !handle, "dlopen() error: " << dlerror());
     return handle;
@@ -91,7 +91,7 @@ void libraryRelease_(LibHandle_t h)
 {
 #if defined(_WIN32)
     FreeLibrary(h);
-#elif defined(__linux__) || defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__HAIKU__) || defined(__GLIBC__)
+#elif defined(__linux__) || defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__HAIKU__) || defined(__GLIBC__) || defined(__EMSCRIPTEN__)
     dlclose(h);
 #endif
 }

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__
+#elif defined __linux__ || defined __APPLE__ || defined __HAIKU__ || defined __FreeBSD__ || defined __GNU__ || defined __EMSCRIPTEN__
 #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__
+#elif defined __linux__ || defined __APPLE__ || defined __HAIKU__ || defined __FreeBSD__ || defined __EMSCRIPTEN__
     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__
+#elif defined __linux__ || defined __APPLE__ || defined __HAIKU__ || defined __FreeBSD__ || defined __EMSCRIPTEN__
     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__
+#elif defined __linux__ || defined __APPLE__ || defined __HAIKU__ || defined __FreeBSD__ || defined __GNU__ || defined __EMSCRIPTEN__
 
 struct FileLock::Impl
 {