--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/format/ms_branch-1.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,28 @@
+/* Test for format checking of conditional expressions.  */
+/* Origin: Joseph Myers <jsm28@cam.ac.uk> */
+/* { dg-do compile { target { *-*-mingw* } } } */
+/* { dg-options "-std=gnu99 -Wformat" } */
+
+#define USE_SYSTEM_FORMATS
+#include "format.h"
+
+void
+foo (long l, int nfoo)
+{
+  printf ((nfoo > 1) ? "%d foos" : "%d foo", nfoo);
+  printf ((l > 1) ? "%d foos" : "%d foo", l); /* { dg-warning "int" "wrong type in conditional expr" } */
+  printf ((l > 1) ? "%ld foos" : "%d foo", l); /* { dg-warning "int" "wrong type in conditional expr" } */
+  printf ((l > 1) ? "%d foos" : "%ld foo", l); /* { dg-warning "int" "wrong type in conditional expr" } */
+  /* Should allow one case to have extra arguments.  */
+  printf ((nfoo > 1) ? "%d foos" : "1 foo", nfoo);
+  printf ((nfoo > 1) ? "many foos" : "1 foo", nfoo); /* { dg-warning "too many" "too many args in all branches" } */
+  printf ((nfoo > 1) ? "%d foos" : "", nfoo);
+  printf ((nfoo > 1) ? "%d foos" : ((nfoo > 0) ? "1 foo" : "no foos"), nfoo);
+  printf ((nfoo > 1) ? "%d foos" : ((nfoo > 0) ? "%d foo" : "%d foos"), nfoo);
+  printf ((nfoo > 1) ? "%d foos" : ((nfoo > 0) ? "%d foo" : "%ld foos"), nfoo); /* { dg-warning "long int" "wrong type" } */
+  printf ((nfoo > 1) ? "%ld foos" : ((nfoo > 0) ? "%d foo" : "%d foos"), nfoo); /* { dg-warning "long int" "wrong type" } */
+  printf ((nfoo > 1) ? "%d foos" : ((nfoo > 0) ? "%ld foo" : "%d foos"), nfoo); /* { dg-warning "long int" "wrong type" } */
+  /* Extra arguments to NULL should be complained about.  */
+  printf (NULL, "foo"); /* { dg-warning "too many" "NULL extra args" } */
+  /* { dg-warning "null" "null format arg" { target *-*-* } .-1 } */
+}