* mingwex/math/nexttoward.c: New file.

* mingwex/math/nexttowardf.c: New file.
	* mingwex/math/nextafterl.c: Add nexttowardl aliaa.
	* mingwex/Makefile.in (MATH_DISTFILES): Add nexttoward.c,
	mexttowardf.c,
	(MATH_OBJS):  Add nexttoward.o,	mexttowardf.o,
	* include/math.h (nexttoward, nextowardf, nexttowardl): Add
	prototypes.

winsup/mingw/mingwex/math/nexttoward.c

@@ -0,0 +1,42 @@
+/*
+   nexttoward.c
+   Contributed by Danny Smith <dannysmith@users.sourceforge.net>
+   No copyright claimed, absolutely no warranties.
+
+   2005-05-10
+*/
+
+#include <math.h>
+
+double
+nexttoward (double x, long double y)
+{
+  union
+  {
+    double d;
+    unsigned long long ll;
+  } u;
+
+  long double xx = x;
+
+  if (isnan (y) || isnan (x))
+    return x + y;
+
+  if (xx == y)
+     /* nextafter (0.0, -O.0) should return -0.0.  */
+     return y;
+  u.d = x; 
+  if (x == 0.0)
+    {
+      u.ll = 1;
+      return y > 0.0L ? u.d : -u.d;
+    }
+
+  /* Non-extended encodings are lexicographically ordered,
+     with implicit "normal" bit.  */ 
+  if (((x > 0.0) ^ (y > xx)) == 0)
+    u.ll++;
+  else
+    u.ll--;
+  return u.d;
+}