commit f75609e015cdb9eb1014b4d2e9cf9fd942bb7b20
author Peter Collingbourne <peter@pcc.me.uk> Thu Sep 29 03:29:28 2016 +0000
committer Peter Collingbourne <peter@pcc.me.uk> Thu Sep 29 03:29:28 2016 +0000
tree 527aba1a44e470ae53a563b9f45ee1f33cec93b7
parent 20ac943748aec8f98694b7b024b206e8bd86b932

Add explanatory comment.

llvm-svn: 282678

llvm/lib/LTO/LTOBackend.cpp

diff --git a/llvm/lib/LTO/LTOBackend.cpp b/llvm/lib/LTO/LTOBackend.cpp
index 86ab8aa..c2fff4a 100644
--- a/llvm/lib/LTO/LTOBackend.cpp
+++ b/llvm/lib/LTO/LTOBackend.cpp
@@ -253,6 +253,10 @@
             std::move(BC), ThreadCount++);
       },
       false);
+
+  // Because the inner lambda (which runs in a worker thread) captures our local
+  // variables, we need to wait for the worker threads to terminate before we
+  // can leave the function scope.
   CodegenThreadPool.wait();
 }