[lit] Output the time elapsed for each test when running lit with -v.

[jlebar]

Summary

For example:

PASS: Clang :: Driver/ppc-features.cpp (346 of 348) in 5775ms
PASS: Clang :: Driver/fsanitize.c (347 of 348) in 7346ms
PASS: Clang :: Driver/arm-cortex-cpus.c (348 of 348) in 21752ms

[jroelofs]

Why? Isn't -time-tests already way more useful?

Also, this breaks any out-of-tree scripts which read the PASS/FAIL lines... which is something that we do. If you do want to do this, please put it under a flag.

[jlebar]

Why? Isn't -time-tests already way more useful?

Oh, indeed it is. I somehow missed that when looking through --help.

Sorry for the noise!

[mehdi_amini]

Do we provide any guarantee on the output format? Scripts that rely on the output format to never change seems like a wrong design IMO. Such needs should be filled with a file output like JUnit.
(The other part of the comment about --time-tests remains valid, even though it is not a complete overlap)

[jroelofs]

In D15980#321919, @joker.eph wrote:

Do we provide any guarantee on the output format? Scripts that rely on the output format to never change seems like a wrong design IMO. Such needs should be filled with a file output like JUnit.

I don't think we do, but the current format is extremely close to DejaGnu's... if that has any bearing on it.

(The other part of the comment about --time-tests remains valid, even though it is not a complete overlap)

utils/lit/lit/main.py

def update(self, test):
         if not shouldShow:
             return
 
         if self.progressBar:
             self.progressBar.clear()
 
         # Show the test result line.
         test_name = test.getFullName()
-        print('%s: %s (%d of %d)' % (test.result.code.name, test_name,
-                                     self.completed, self.numTests))
+        print('%s: %s (%d of %d) in %0.fms' % (
+                  test.result.code.name, test_name, self.completed,
+                  self.numTests, 1000 * test.result.elapsed))
 
         # Show the test failure output, if requested.
         if (test.result.code.isFailure and self.opts.showOutput) or \
            self.opts.showAllOutput:
             if test.result.code.isFailure:
                 print("%s TEST '%s' FAILED %s" % ('*'*20, test.getFullName(),
                                                   '*'*20))
             print(test.result.output)