--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/compiler-rt/test/sanitizer_common/TestCases/printf-ldbl.c	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,13 @@
+// RUN: %clang %s -o %t && %run %t 2>&1
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(int argc, char **argv) {
+  char buf[20];
+  long double ld = 4.0;
+  snprintf(buf, sizeof buf, "%Lf %d", ld, 123);
+  assert(!strcmp(buf, "4.000000 123"));
+  return 0;
+}