cmake: force lowercase plugins internal names

modules/core/CMakeLists.txt

@@ -27,6 +27,7 @@ set(PARALLEL_ENABLE_PLUGINS "${PARALLEL_ENABLE_PLUGINS_DEFAULT}" CACHE BOOL "All
 # TODO building plugins with OpenCV is not supported yet
 #set(PARALLEL_PLUGIN_LIST "" CACHE STRING "List of parallel backends to be compiled as plugins (tbb, openmp or special value 'all')")
 #string(REPLACE "," ";" PARALLEL_PLUGIN_LIST "${PARALLEL_PLUGIN_LIST}")  # support comma-separated list (,) too
+#string(TOLOWER "${PARALLEL_PLUGIN_LIST}" PARALLEL_PLUGIN_LIST)
 
 
 ocv_add_module(core

modules/highgui/cmake/init.cmake

@@ -8,6 +8,7 @@ if(PROJECT_NAME STREQUAL "OpenCV")
   mark_as_advanced(HIGHGUI_PLUGIN_LIST HIGHGUI_ENABLE_PLUGINS)
 
   string(REPLACE "," ";" HIGHGUI_PLUGIN_LIST "${HIGHGUI_PLUGIN_LIST}")  # support comma-separated list (,) too
+  string(TOLOWER "${HIGHGUI_PLUGIN_LIST}" HIGHGUI_PLUGIN_LIST)
   if(NOT HIGHGUI_ENABLE_PLUGINS)
     if(HIGHGUI_PLUGIN_LIST)
       message(WARNING "HighGUI: plugins are disabled through HIGHGUI_ENABLE_PLUGINS, so HIGHGUI_PLUGIN_LIST='${HIGHGUI_PLUGIN_LIST}' is ignored")

modules/videoio/CMakeLists.txt

@@ -8,6 +8,7 @@ set(VIDEOIO_ENABLE_PLUGINS "${VIDEOIO_ENABLE_PLUGINS_DEFAULT}" CACHE BOOL "Allow
 mark_as_advanced(VIDEOIO_PLUGIN_LIST VIDEOIO_ENABLE_PLUGINS)
 
 string(REPLACE "," ";" VIDEOIO_PLUGIN_LIST "${VIDEOIO_PLUGIN_LIST}")  # support comma-separated list (,) too
+string(TOLOWER "${VIDEOIO_PLUGIN_LIST}" VIDEOIO_PLUGIN_LIST)
 if(NOT VIDEOIO_ENABLE_PLUGINS)
   if(VIDEOIO_PLUGIN_LIST)
     message(WARNING "VideoIO: plugins are disabled through VIDEOIO_ENABLE_PLUGINS, so VIDEOIO_PLUGIN_LIST='${VIDEOIO_PLUGIN_LIST}' is ignored")