+/* LONG_DOUBLE_STYLE_IEEE
+ * This symbol, if defined, indicates that the long double
+ * is any of the IEEE 754 style long doubles:
+ * LONG_DOUBLE_STYLE_IEEE_STD, LONG_DOUBLE_STYLE_IEEE_EXTENDED,
+ * LONG_DOUBLE_STYLE_IEEE_DOUBLEDOUBLE.
+ */
+/* LONG_DOUBLE_STYLE_IEEE_DOUBLEDOUBLE
+ * This symbol, if defined, indicates that the long double is
+ * the 128-bit double-double.
+ */
+/* LONG_DOUBLE_STYLE_IEEE_EXTENDED
+ * This symbol, if defined, indicates that the long double is
+ * the 80-bit IEEE 754. Note that despite the 'extended' this
+ * is less than the 'std', since this is an extension of
+ * the double precision.
+ */
+/* LONG_DOUBLE_STYLE_IEEE_STD
+ * This symbol, if defined, indicates that the long double is
+ * the 128-bit IEEE 754.
+ */
+/* LONG_DOUBLE_STYLE_VAX
+ * This symbol, if defined, indicates that the long double is
+ * the 128-bit VAX format H.
+ */