diff --git a/compiler-rt/test/lit.common.cfg b/compiler-rt/test/lit.common.cfg
--- a/compiler-rt/test/lit.common.cfg
+++ b/compiler-rt/test/lit.common.cfg
@@ -388,8 +388,9 @@
       [os.path.join(config.llvm_tools_dir, 'llvm-config'), '--assertion-mode'],
       stdout = subprocess.PIPE,
       env=config.environment)
-except OSError:
-  print("Could not find llvm-config in " + config.llvm_tools_dir)
+except OSError as e:
+  print("Could not launch llvm-config in " + config.llvm_tools_dir)
+  print("    Failed with error #{0}: {1}".format(e.errno, e.strerror))
   exit(42)
 
 if re.search(r'ON', llvm_config_cmd.stdout.read().decode('ascii')):