[PATCH] [lit] Add --show-xfail flag to LIT.

[Eric Fiselier]

Hi ddunbar,

This patch add a --show-xfail flag. If this flag is specified then each xfail test will be printed to output.
When it is not given xfail tests are ignored. Ignoring xfail tests is the current behavior.

This flag is meant to mirror the --show-unsupported flag that was recently added.

http://reviews.llvm.org/D4750

Files:
  docs/CommandGuide/lit.rst
  utils/lit/lit/main.py

Index: docs/CommandGuide/lit.rst
===================================================================
--- docs/CommandGuide/lit.rst
+++ docs/CommandGuide/lit.rst
@@ -88,6 +88,10 @@
 
  Show the names of unsupported tests.
 
+.. option:: --show-xfail
+
+ Show the names of tests that were expected to fail.
+
 .. _execution-options:
 
 EXECUTION OPTIONS
Index: utils/lit/lit/main.py
===================================================================
--- utils/lit/lit/main.py
+++ utils/lit/lit/main.py
@@ -44,6 +44,7 @@
 
         shouldShow = test.result.code.isFailure or \
             (self.opts.show_unsupported and test.result.code.name == 'UNSUPPORTED') or \
+            (self.opts.show_xfail and test.result.code.name == 'XFAIL') or \
             (not self.opts.quiet and not self.opts.succinct)
         if not shouldShow:
             return
@@ -173,6 +174,9 @@
     group.add_option("", "--show-unsupported", dest="show_unsupported",
                      help="Show unsupported tests",
                      action="store_true", default=False)
+    group.add_option("", "--show-xfail", dest="show_xfail",
+                     help="Show tests that were expected to fail",
+                     action="store_true", default=False)
     parser.add_option_group(group)
 
     group = OptionGroup(parser, "Test Execution")
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