Add Q_CORE_EXPORT to ThreadEngineBarrier

The ThreadEngine template uses functions from ThreadEngineBarrier,
so ThreadEngineBarrier must be exported to other libraries/programs
that instantiate the template.

Reviewed-by: trustme

1 files changed, 1 insertions, 1 deletions

diff --git a/src/corelib/concurrent/qtconcurrentthreadengine.h b/src/corelib/concurrent/qtconcurrentthreadengine.h
index 286c2b8..896b193 100644
--- a/src/corelib/concurrent/qtconcurrentthreadengine.h
+++ b/src/corelib/concurrent/qtconcurrentthreadengine.h
@@ -66,7 +66,7 @@ namespace QtConcurrent {
 // The ThreadEngineBarrier counts worker threads, and allows one
 // thread to wait for all others to finish. Tested for its use in
 // QtConcurrent, requires more testing for use as a general class.
-class ThreadEngineBarrier
+class Q_CORE_EXPORT ThreadEngineBarrier
 {
 private:
     // The thread count is maintained as an integer in the count atomic