Add incomplet long double math support to libmingwex.a

winsup/mingw/mingwex/math/nextafterf.c

@@ -0,0 +1,29 @@
+#include <math.h>
+
+float
+nextafterf (float x, float y)
+{
+  union
+  {
+    float f;
+    unsigned int i;
+  } u;
+  if (isnan (y) || isnan (x))
+    return x + y;
+  if (x == y )
+     return x;
+  u.f = x; 
+  if (u.i == 0u)
+    {
+      if (y > 0.0F)
+	u.i = 1;
+      else
+	u.i = 0x80000001;
+      return u.f;
+    }
+   if (((x > 0.0F) ^ (y > x)) == 0)
+    u.i++;
+  else
+    u.i--;
+  return u.f;
+}