Index: test/tools/llvm-config/flush-stdout.test
===================================================================
--- /dev/null
+++ test/tools/llvm-config/flush-stdout.test
@@ -0,0 +1,4 @@
+RUN: llvm-config --version | grep '\.'
+
+Test that stdout is flushed when llvm-config exits, so that the output can be
+piped to other programs.
Index: tools/llvm-config/llvm-config.cpp
===================================================================
--- tools/llvm-config/llvm-config.cpp
+++ tools/llvm-config/llvm-config.cpp
@@ -606,5 +606,6 @@
     usage();
   }
 
+  OS.flush();
   return 0;
 }