Do not list enabled checks when -quiet is given to run-clang-tidy.

[svenpanne]

Summary

When run-clang-tidy is given the -quiet flag, do not output the potentially hundreds of enabled check names at the beginning.

[JonasToth]

LGTM

[svenpanne]

Thanks for the review. How will the patch be merged? According to https://llvm.org/docs/Phabricator.html#committing-a-change, someone else has to do it for me, because AFAICT, I have no commit rights. As I said: I'm still in the process of learning the workflow here... :-)

[JonasToth]

Yes someone has to do it on behalf of you.
I did so for you. After a view good patches you can get commit rights from chris lattner, until then the reviewer can commit for you.

Thank you for the patch!

clang-tools-extra/clang-tidy/tool/run-clang-tidy.py

else:
     build_path = find_compilation_database(db_path)
 
   try:
     invocation = [args.clang_tidy_binary, '-list-checks']
     invocation.append('-p=' + build_path)
     if args.checks:
       invocation.append('-checks=' + args.checks)
     invocation.append('-')
+    if args.quiet:
+      # Even with -quiet we still want to check if we can call clang-tidy.
+      with open(os.devnull, 'w') as dev_null:
+        subprocess.check_call(invocation, stdout=dev_null)
+    else:
       subprocess.check_call(invocation)
   except:
     print("Unable to run clang-tidy.", file=sys.stderr)
     sys.exit(1)
 
   # Load the database and extract all files.
   database = json.load(open(os.path.join(build_path, db_path)))
   files = [make_absolute(entry['file'], entry['directory'])
            for entry in database]