It wasn't make update that screw the repo up. It's the svn up command itself

git-svn-id: http://root.cern.ch/svn/root/trunk@43309 27541ba8-7e3a-0410-8455-c3a389f83636

cint/cling/tools/dev/RepairSvnRepo.sh

 #!/bin/bash
 
 ################################################################################
-# Simple script that helps to heal the llvm's make update command, which       #
-# overwrites the current local rev number of cling's repository. It takes the  #
-# revision that it thinks is the current, the correct revision and optional    #
-# path. If no path provided it uses the current dir.                           #
+# Simple script that helps to heal the svn update command, which overwrites    #
+# the current local rev number of cling's repo when inline in llvm source tree.#
+# It takes the revision that it thinks is the current, the correct revision    #
+# and optional path. If no path provided it uses the current dir.                           #
 ################################################################################
 #                                                                              #
 #                Author: Vassil Vassilev (vvasilev@cern.ch)                    #