lit: Issue a note when multiprocessing fails to load

If multiprocessing was requested, detected as available and subsequently failed
to initialize it's worth letting the user know about it before falling back to
threads.

This condition can arise in certain OpenBSD / FreeBSD Python versions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193465 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/utils/lit/lit/run.py b/utils/lit/lit/run.py
index ed39c40fa5626143fc23f5c9e61e0510563605c9..97f8c6fe010ed1fedbe10d187adbf2e463fa6eff 100644 (file)
--- a/utils/lit/lit/run.py
+++ b/utils/lit/lit/run.py
@@ -218,6 +218,7 @@ class Run(object):
                 consumer = MultiprocessResultsConsumer(self, display, jobs)
             except ImportError:
                 # Workaround for BSD: http://bugs.python.org/issue3770
+                self.lit_config.note('failed to initialize multiprocessing')
                 consumer = None
         if not consumer:
             task_impl = threading.Thread