1 files changed, 85 insertions, 0 deletions
diff --git a/gnulib-tests/nan.h b/gnulib-tests/nan.h
new file mode 100644
index 0000000..6a3a239
--- /dev/null
+++ b/gnulib-tests/nan.h
@@ -0,0 +1,85 @@
+/* Macros for not-a-number.
+   Copyright (C) 2007-2022 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+
+/* IBM z/OS supports both hexadecimal and IEEE floating-point formats. The
+   former does not support NaN and its isnan() implementation returns zero
+   for all values.  */
+#if defined __MVS__ && defined __IBMC__ && !defined __BFP__
+# error "NaN is not supported with IBM's hexadecimal floating-point format; please re-compile with -qfloat=ieee"
+#endif
+
+/* NaNf () returns a 'float' not-a-number.  */
+
+/* The Compaq (ex-DEC) C 6.4 compiler and the Microsoft MSVC 9 compiler choke
+   on the expression 0.0 / 0.0.  The IBM XL C compiler on z/OS complains.
+   PGI 16.10 complains.  */
+#if (defined __DECC || defined _MSC_VER \
+     || (defined __MVS__ && defined __IBMC__)   \
+     || defined __PGI)
+static float
+NaNf ()
+{
+  static float zero = 0.0f;
+  return zero / zero;
+}
+#else
+# define NaNf() (0.0f / 0.0f)
+#endif
+
+
+/* NaNd () returns a 'double' not-a-number.  */
+
+/* The Compaq (ex-DEC) C 6.4 compiler and the Microsoft MSVC 9 compiler choke
+   on the expression 0.0 / 0.0.  The IBM XL C compiler on z/OS complains.
+   PGI 16.10 complains.  */
+#if (defined __DECC || defined _MSC_VER \
+     || (defined __MVS__ && defined __IBMC__)   \
+     || defined __PGI)
+static double
+NaNd ()
+{
+  static double zero = 0.0;
+  return zero / zero;
+}
+#else
+# define NaNd() (0.0 / 0.0)
+#endif
+
+
+/* NaNl () returns a 'long double' not-a-number.  */
+
+/* On Irix 6.5, gcc 3.4.3 can't compute compile-time NaN, and needs the
+   runtime type conversion.
+   The Microsoft MSVC 9 compiler chokes on the expression 0.0L / 0.0L.
+   The IBM XL C compiler on z/OS complains.
+   PGI 16.10 complains.  */
+#ifdef __sgi
+static long double NaNl ()
+{
+  double zero = 0.0;
+  return zero / zero;
+}
+#elif defined _MSC_VER || (defined __MVS__ && defined __IBMC__) || defined __PGI
+static long double
+NaNl ()
+{
+  static long double zero = 0.0L;
+  return zero / zero;
+}
+#else
+# define NaNl() (0.0L / 0.0L)
+#endif