tree dcd246108322f187d458b343ebe5cc85bb785cab
parent 333b6cb76040b4d32705e1f16f96d18b2ad7e4d5
author Zachary Turner <zturner@google.com> 1498838490 +0000
committer Zachary Turner <zturner@google.com> 1498838490 +0000

[lit] Clean output directories before running tests.

Presently lit leaks files in the tests' output directories.
Specifically, if a test creates output files, lit makes no
effort to remove them prior to the next test run.  This is
problematic because it leads to false positives whenever a
test passes because stale  files were present.  In general
it is a source of flakiness that should be removed.

This patch addresses this by building the list of all test
directories that are part of the current run set, and then
deleting those directories and recreating them anew.  This
gives each test a clean baseline to start from.

Differential Revision: https://reviews.llvm.org/D34732

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306832 91177308-0d34-0410-b5e6-96231b3b80d8