[opt-viewer] Suggest installing the faster parser (libYAML)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296553 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/utils/opt-viewer/opt-viewer.py b/utils/opt-viewer/opt-viewer.py
index 597c7031069f933edf8fe605f0d46606c0cb6a96..8ac491eb6c872f637a811b4d085742b96787131a 100755 (executable)
--- a/utils/opt-viewer/opt-viewer.py
+++ b/utils/opt-viewer/opt-viewer.py
@@ -5,15 +5,14 @@ from __future__ import print_function
 desc = '''Generate HTML output to visualize optimization records from the YAML files
 generated with -fsave-optimization-record and -fdiagnostics-show-hotness.
 
-The tools requires PyYAML and Pygments Python packages.
-
-For faster parsing, you may want to use libYAML with PyYAML.'''
+The tools requires PyYAML and Pygments Python packages.'''
 
 import yaml
 # Try to use the C parser.
 try:
     from yaml import CLoader as Loader
 except ImportError:
+    print("For faster parsing, you may want to install libYAML for PyYAML")
     from yaml import Loader
 
 import functools