Honor MACOSX_DEPLOYMENT_TARGET environment variable.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68822 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Driver/darwin-version.c b/test/Driver/darwin-version.c
new file mode 100644
index 0000000..b0e86fa
--- /dev/null
+++ b/test/Driver/darwin-version.c
@@ -0,0 +1,6 @@
+// RUN: env MACOSX_DEPLOYMENT_TARGET=10.1 clang -E %s
+
+#if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ != 1010
+#error Invalid version
+#endif
+