fix python home and path on windows

CMakeLists.txt

@@ -62,7 +62,7 @@ if(${CMAKE_VERSION} VERSION_GREATER 3.11.4)
     find_path(Python3_INCLUDE_DIRS "Python.h" HINTS "${MINGW_INCLUDE_DIR}/python${MINGW_PYTHON_VERSION}m" NO_DEFAULT_PATH)
     if (EXISTS ${Python3_LIBRARIES} AND EXISTS ${Python3_INCLUDE_DIRS})
       set(Python3_FOUND True)
-      set(Python3_LIBRARY_DIRS "${MINGW_LIBRARY_DIR}/python${MINGW_PYTHON_VERSION}")
+      set(Python3_LIBRARY_DIRS ${MINGW_LIBRARY_DIR})
       set(Python3_VERSION_MAJOR 3)
       set(Python3_VERSION_MINOR 7)
     endif()
@@ -76,7 +76,6 @@ endif()
 
 if(${Python3_FOUND})
   if(${CMAKE_HOST_WIN32})
-    set(PYTHONLIBS_FOUND True)
     set(PYTHON_MODULE_EXTENSION True)
   endif()
   set(PYTHONLIBS_FOUND ${Python3_FOUND})
@@ -99,6 +98,7 @@ endif()
 
 if(${PYGOBJECT_FOUND})
   add_definitions(-DJUCI_ENABLE_PLUGINS)
+  add_definitions(-DPYTHON_HOME_DIR=L"${PYTHON_LIBRARY_DIR}")
 else()
   message(STATUS "Python or pygobject not found. Building juCi++ without plugin support.")
 endif()

src/python_interpreter.cc

@@ -27,5 +27,13 @@ Python::Interpreter::~Interpreter() {
 }
 
 Python::Interpreter::Interpreter() {
+#ifdef PYTHON_HOME_DIR
+#ifdef _WIN32
+  const std::wstring python_home(PYTHON_HOME_DIR);
+  const std::wstring python_path(python_home + L";" + python_home + L"\\lib-dynload;" + python_home + L"\\site-packages" );
+  Py_SetPythonHome(python_home.c_str());
+  Py_SetPath(python_path.c_str());
+#endif
+#endif
   py::initialize_interpreter();
 }