--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/c2x-float-1.c	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,37 @@
+/* Test *_NORM_MAX macros.  */
+/* { dg-do run } */
+/* { dg-options "-std=c2x -pedantic-errors" } */
+
+#include <float.h>
+
+#ifndef FLT_NORM_MAX
+#error "FLT_NORM_MAX undefined"
+#endif
+
+#ifndef DBL_NORM_MAX
+#error "DBL_NORM_MAX undefined"
+#endif
+
+#ifndef LDBL_NORM_MAX
+#error "LDBL_NORM_MAX undefined"
+#endif
+
+extern void abort (void);
+extern void exit (int);
+
+int
+main (void)
+{
+  if (FLT_NORM_MAX != FLT_MAX)
+    abort ();
+  if (DBL_NORM_MAX != DBL_MAX)
+    abort ();
+#if LDBL_MANT_DIG == 106
+  if (LDBL_NORM_MAX != 0x0.ffffffffffffffffffffffffffcp1023L)
+    abort ();
+#else
+  if (LDBL_NORM_MAX != LDBL_MAX)
+    abort ();
+#endif
+  exit (0);
+}