Disable pthread support in googletest if llvm was configured without threads.

llvm-svn: 105390
diff --git a/llvm/unittests/Makefile.unittest b/llvm/unittests/Makefile.unittest
index 6001c43..2a701a0 100644
--- a/llvm/unittests/Makefile.unittest
+++ b/llvm/unittests/Makefile.unittest
@@ -27,6 +27,11 @@
 # supported by Clang, so force googletest to use its own tuple implementation.
 CPP.Flags += -DGTEST_USE_OWN_TR1_TUPLE
 
+# Disable pthreads if LLVM was configured without them.
+ifneq ($(HAVE_PTHREAD), 1)
+  CPP.Flags += -DGTEST_HAS_PTHREAD=0
+endif
+
 TESTLIBS = -lGoogleTest -lUnitTestMain
 
 ifeq ($(ENABLE_SHARED), 1)