don't wait for subprocs when none running

diff --git a/build.cc b/build.cc
index a7d2418..83282e5 100644 (file)
--- a/build.cc
+++ b/build.cc
@@ -113,7 +113,7 @@ bool RealCommandRunner::StartCommand(Edge* edge) {
 }
 
 void RealCommandRunner::WaitForCommands() {
-  while (subprocs_.finished_.empty()) {
+  while (subprocs_.finished_.empty() && !subprocs_.running_.empty()) {
     subprocs_.DoWork();
   }
 }