Build: wrap make invocations with flock(1)

Lock each directory before entering it so when using -j, the same
dependency isn't built more than once at a time.

This doesn't get full -j parallelism though, since one make child
will be sitting idle waiting for flock to receive its lock and
continue making (which should then do nothing since it will have
been built already).  Unfortunately there's not much that can be
done to fix that since it can't proceed until its dependency is
built by another make process.

1 files changed, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 8ab4e9408b..31e79296d0 100644
--- a/Makefile
+++ b/Makefile
@@ -23,6 +23,6 @@ ifeq ($(UNAME_S),Darwin)
 test: 
 else
 test:
-	$(QUIET) $(MAKE) -C AK/Tests clean all clean
+	$(QUIET) flock AK/Tests $(MAKE) -C AK/Tests clean all clean
 endif