diff -ur root-6.20.02.orig/bindings/pyroot/src/Cppyy.cxx root-6.20.02/bindings/pyroot/src/Cppyy.cxx
--- root-6.20.02.orig/bindings/pyroot/src/Cppyy.cxx	2020-03-15 16:21:25.000000000 +0100
+++ root-6.20.02/bindings/pyroot/src/Cppyy.cxx	2020-03-24 19:26:38.162272398 +0100
@@ -74,10 +74,6 @@
 class ApplicationStarter {
 public:
    ApplicationStarter() {
-      // Insure ROOT's atexit is executed *after* the atexit that calls
-      // ApplicationStarter's destructor, by forcing the ROOT's atexit
-      // registration now.
-      TROOT::Initialize();
       // setup dummy holders for global and std namespaces
       assert( g_classrefs.size() == GLOBAL_HANDLE );
       g_name2classrefidx[ "" ]      = GLOBAL_HANDLE;
diff -ur root-6.20.02.orig/bindings/pyroot_experimental/cppyy/cppyy-backend/clingwrapper/src/clingwrapper.cxx root-6.20.02/bindings/pyroot_experimental/cppyy/cppyy-backend/clingwrapper/src/clingwrapper.cxx
--- root-6.20.02.orig/bindings/pyroot_experimental/cppyy/cppyy-backend/clingwrapper/src/clingwrapper.cxx	2020-03-15 16:21:25.000000000 +0100
+++ root-6.20.02/bindings/pyroot_experimental/cppyy/cppyy-backend/clingwrapper/src/clingwrapper.cxx	2020-03-24 19:26:38.182272186 +0100
@@ -109,10 +109,6 @@
 class ApplicationStarter {
 public:
     ApplicationStarter() {
-     // Insure ROOT's atexit is executed *after* the atexit that calls
-     // ApplicationStarter's destructor, by forcing the ROOT's atexit
-     // registration now.
-        TROOT::Initialize();
     // setup dummy holders for global and std namespaces
         assert(g_classrefs.size() == GLOBAL_HANDLE);
         g_name2classrefidx[""]      = GLOBAL_HANDLE;
diff -ur root-6.20.02.orig/core/base/inc/TROOT.h root-6.20.02/core/base/inc/TROOT.h
--- root-6.20.02.orig/core/base/inc/TROOT.h	2020-03-15 16:21:25.000000000 +0100
+++ root-6.20.02/core/base/inc/TROOT.h	2020-03-24 19:26:38.182272186 +0100
@@ -351,7 +351,6 @@
    static void        SetMacroPath(const char *newpath);
    static Int_t       IncreaseDirLevel();
    static void        IndentLevel();
-   static void        Initialize();
    static Bool_t      Initialized();
    static Bool_t      MemCheck();
    static void        SetDirLevel(Int_t level = 0);
diff -ur root-6.20.02.orig/core/base/src/TROOT.cxx root-6.20.02/core/base/src/TROOT.cxx
--- root-6.20.02.orig/core/base/src/TROOT.cxx	2020-03-15 16:21:25.000000000 +0100
+++ root-6.20.02/core/base/src/TROOT.cxx	2020-03-24 20:10:54.640084486 +0100
@@ -1022,10 +1022,12 @@
       SafeDelete(fCleanups);
 #endif
 
-#ifndef _MSC_VER
-      // deleting the interpreter makes things crash at exit in some cases
-      delete fInterpreter;
-#endif
+      // llvm::TimingGroup used for measuring the timing relies the destructors.
+      // In order to make use of this feature we have to call the destructor of
+      // TCling which will shut down clang, cling and llvm.
+      // gSystem->Getenv is not available anymore.
+      if (::getenv("ROOT_CLING_TIMING"))
+         delete fInterpreter;
 
       // Prints memory stats
       TStorage::PrintStatistics();
@@ -2848,13 +2850,6 @@
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-/// Initialize ROOT explicitly.
-
-void TROOT::Initialize() {
-   (void) gROOT;
-}
-
-////////////////////////////////////////////////////////////////////////////////
 /// Return kTRUE if the TROOT object has been initialized.
 
 Bool_t TROOT::Initialized()