1 files changed, 25 insertions, 0 deletions
diff --git a/test/PCH/rdar8852495.c b/test/PCH/rdar8852495.c
new file mode 100644
index 0000000000..2d49e001b0
--- /dev/null
+++ b/test/PCH/rdar8852495.c
@@ -0,0 +1,25 @@
+// Test this without pch.
+// RUN: %clang_cc1 %s -include %s -verify -fsyntax-only -Wno-sign-compare -Wtautological-compare
+
+// Test with pch.
+// RUN: %clang_cc1 %s -emit-pch -o %t -Wsign-compare -Wtautological-compare
+// RUN: %clang_cc1 %s -include-pch %t -verify -fsyntax-only -Wno-sign-compare -Wtautological-compare
+
+// This tests that diagnostic mappings from PCH are propagated for #pragma
+// diagnostics but not for command-line flags.
+
+#ifndef HEADER
+#define HEADER
+
+#pragma clang diagnostic ignored "-Wtautological-compare"
+
+#else
+
+int f() {
+  int b = b==b;
+  unsigned x;
+  signed y;
+  return x == y;
+}
+
+#endif