Add --v2 flag to show warnings

Author: imorlxs

cmake/FindROOT.cmake

@@ -196,7 +196,7 @@ function(REFLEX_GENERATE_DICTIONARY dictionary)
   #set(rootmapopts --rootmap=${rootmapname} --rootmap-lib=${libprefix}${dictionary}Dict)
   #---Actual command----------------------------------------
   add_custom_command(OUTPUT ${gensrcdict} ${rootmapname} ${dictionary}_rdict.pcm
-    COMMAND ${ROOTCLING_EXECUTABLE} --reflex -f ${gensrcdict} ${rootmapopts} ${headerfiles} ${selectionfile} --noIncludePaths --inlineInputHeader
+    COMMAND ${ROOTCLING_EXECUTABLE} --reflex --v2 -f ${gensrcdict} ${rootmapopts} ${headerfiles} ${selectionfile} --noIncludePaths --inlineInputHeader
                             ${ARG_OPTIONS} ${includedirs} ${definitions}
                      DEPENDS ${headerfiles} ${selectionfile})
 endfunction()

util/makefile-build/bdm-code-generation

@@ -58,7 +58,7 @@ CXX_INCLUDES=$(${BDM_CONFIG} --cxxincludes | sed 's|-isystem |-I|g')
 
 CXX_DEFINES=$(${BDM_CONFIG} --cxxdefines)
 
-rootcling --reflex -f ${DICT} ${HEADERS} ${SELECTIONFILE} --noIncludePaths --inlineInputHeader ${CXX_DEFINES} ${CXX_INCLUDES} $ADDITIONAL_CXX_FLAGS
+rootcling --reflex --v2 -f ${DICT} ${HEADERS} ${SELECTIONFILE} --noIncludePaths --inlineInputHeader ${CXX_DEFINES} ${CXX_INCLUDES} $ADDITIONAL_CXX_FLAGS
 
 # Generate bdm dictionary and append to DICT
 BDM_DICT=$(mktemp)