1 files changed, 21 insertions, 0 deletions
diff --git a/test/Misc/warn-in-system-macro-def.c b/test/Misc/warn-in-system-macro-def.c
new file mode 100644
index 0000000000..bdf7d39325
--- /dev/null
+++ b/test/Misc/warn-in-system-macro-def.c
@@ -0,0 +1,21 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin -isystem %S -Wdouble-promotion -fsyntax-only %s  2>&1 | FileCheck -allow-empty %s
+// CHECK: warning:
+// CHECK: expanded from macro 'ISNAN'
+// CHECK: expanded from macro 'isnan'
+
+#include <warn-in-system-macro-def.c.inc>
+
+#define isnan(x) \
+	(sizeof (x) == sizeof (float)                \
+	? __isnanf (x)                    \
+	: sizeof (x) == sizeof (double)               \
+	? __isnan (x) : __isnanl (x))
+
+int main(void)
+{
+	double foo = 1.0;
+
+	if (ISNAN(foo))
+		return 1;
+	return 0;
+}