[lit] Fix TestRunner unit test on Windows

Summary:
Normally Python converts all newline characters, Windows or Unix,
to Unix newlines when opening a file. However, lit opens files in
binary mode, which does not perform this conversion. As a result,
trailing Windows newlines are not stripped from test input, which
caused a failure in the TestRunner unit test:

```
FAIL: test_custom (__main__.TestIntegratedTestKeywordParser)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Users\bgesiak\src\llvm\llvm\utils\lit\tests\unit\TestRunner.py", line 109, in test_custom
    self.assertItemsEqual(value, ['a', 'b', 'c'])
AssertionError: Element counts were not equal:
First has 1, Second has 0: 'c\r'
First has 0, Second has 1:  'c'
```

Fix the discrepancy in behavior across the two platforms by
manually stripping Windows newlines before yielding each line in
the test file.

Reviewers: echristo, beanz, ddunbar, delcypher, rnk

Reviewed By: rnk

Subscribers: mehdi_amini, llvm-commits

Differential Revision: https://reviews.llvm.org/D27746

llvm-svn: 309312

1 files changed, 5 insertions, 1 deletions

diff --git a/llvm/utils/lit/lit/TestRunner.py b/llvm/utils/lit/lit/TestRunner.py
index a60a0f85487..404b8f6581b 100644
--- a/llvm/utils/lit/lit/TestRunner.py
+++ b/llvm/utils/lit/lit/TestRunner.py
@@ -787,9 +787,13 @@ def parseIntegratedTestScriptCommands(source_path, keywords):
             # command. Note that we take care to return regular strings in
             # Python 2, to avoid other code having to differentiate between the
             # str and unicode types.
+            #
+            # Opening the file in binary mode prevented Windows \r newline
+            # characters from being converted to Unix \n newlines, so manually
+            # strip those from the yielded lines.
             keyword,ln = match.groups()
             yield (line_number, to_string(keyword.decode('utf-8')),
-                   to_string(ln.decode('utf-8')))
+                   to_string(ln.decode('utf-8').rstrip('\r')))
     finally:
         f.close()