Print some info/warning/error message where the gccxml executable is found/or not

git-svn-id: http://root.cern.ch/svn/root/trunk@17016 27541ba8-7e3a-0410-8455-c3a389f83636

reflex/python/genreflex/genreflex.py

@@ -204,13 +204,17 @@ class genreflex:
         pass
     if self.gccxmlpath :
       self.gccxml = self.gccxmlpath + os.sep + 'gccxml'
+      if not os.path.isfile(self.gccxml) :
+        print '--->> genreflex: ERROR: Path to gccxml given, but no executable found at', self.gccxml
     elif self.which('gccxml') :
       self.gccxml = 'gccxml'
+      print '--->> genreflex: INFO: No explicit path to gccxml given. Found gccxml at', self.which('gccxml')
     else :
       if sys.platform == 'win32' :
         self.gccxml = r'\\cern.ch\dfs\Experiments\sw\lcg\external\gccxml\0.6.0_patch3\win32_vc71\bin\gccxml'
       else :
         self.gccxml = '/afs/cern.ch/sw/lcg/external/gccxml/0.6.0_patch3/slc3_ia32_gcc323/bin/gccxml'
+      print '--->> genreflex: INFO: No gccxml executable found, using fallback location at', self.gccxml
     #---------------Open selection file-------------------
     try :
       if self.select : self.selector = selclass.selClass(self.select,parse=1)