Change err_pp_file_not_found back to an Error; when it's a Warning, we suppress it in system headers. And it is not a good idea to suppress it in system headers. (This was originally changed in r134996 to implement -MG.)
Fixes <rdar://10041960>. And also brings down the number of warnings without a flag by one :)
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@138842 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Preprocessor/missing-system-header.c b/test/Preprocessor/missing-system-header.c
new file mode 100644
index 0000000..69cb131
--- /dev/null
+++ b/test/Preprocessor/missing-system-header.c
@@ -0,0 +1,2 @@
+// RUN: %clang_cc1 -verify -fsyntax-only %s
+#include "missing-system-header.h"