Index: llvm/utils/lit/lit/discovery.py
===================================================================
--- llvm/utils/lit/lit/discovery.py
+++ llvm/utils/lit/lit/discovery.py
@@ -48,10 +48,8 @@
         # configuration to load instead.
         config_map = litConfig.params.get('config_map')
         if config_map:
-            cfgpath = os.path.realpath(cfgpath)
-            cfgpath = os.path.normpath(cfgpath)
-            cfgpath = os.path.normcase(cfgpath)
-            target = config_map.get(cfgpath)
+            source_inode = os.stat(cfgpath)
+            target = config_map.get(source_inode)
             if target:
                 cfgpath = target
 
Index: llvm/utils/llvm-lit/llvm-lit.in
===================================================================
--- llvm/utils/llvm-lit/llvm-lit.in
+++ llvm/utils/llvm-lit/llvm-lit.in
@@ -7,11 +7,9 @@
 
 def map_config(source_dir, site_config):
     global config_map
-    source_dir = os.path.realpath(source_dir)
-    source_dir = os.path.normpath(source_dir)
-    source_dir = os.path.normcase(source_dir)
+    source_inode = os.stat(source_dir).st_ino
     site_config = os.path.normpath(site_config)
-    config_map[source_dir] = site_config
+    config_map[source_inode] = site_config
 
 # Variables configured at build time.
 llvm_source_root = "@LLVM_SOURCE_DIR@"