--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/format/ms_c90-scanf-2.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,26 @@
+/* Test for scanf formats.  Formats using C99 features should be rejected
+   outside of C99 mode.
+*/
+/* Origin: Joseph Myers <jsm28@cam.ac.uk> */
+/* { dg-do compile { target { *-*-mingw* } } } */
+/* { dg-options "-std=iso9899:1990 -pedantic -Wformat" } */
+
+#define USE_SYSTEM_FORMATS
+#include "format.h"
+
+void
+foo (signed char *hhp, float *fp, llong *llp, intmax_t *jp,
+     size_t *zp, ptrdiff_t *tp)
+{
+  /* Some tests already in c90-scanf-1.c.  */
+  /* The widths hh, ll, j, z, t are new.  */
+  scanf ("%hhd", hhp); /* { dg-warning "unknown|format" "%hh is unsupported" } */
+  scanf ("%I64d", llp); /* { dg-warning "length|C" "%I64 in C90" } */
+  scanf ("%jd", jp); /* { dg-warning "unknown|format" "%j is unsupported" } */
+  scanf ("%zu", zp); /* { dg-warning "unknown|format" "%z is unsupported" } */
+  scanf ("%td", tp); /* { dg-warning "unknown|format" "%t is unsupported" } */
+  /* The formats F, a, A are new.  */
+  scanf ("%F", fp); /* { dg-warning "unknown|format" "%F is unsupported" } */
+  scanf ("%a", fp); /* { dg-warning "unknown|format" "%a is unsupported" } */
+  scanf ("%A", fp); /* { dg-warning "unknown|format" "%A is unsupported" } */
+}