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-rw-r--r--include/math.h23
1 files changed, 23 insertions, 0 deletions
diff --git a/include/math.h b/include/math.h
index 8759c28bff..2a694300b7 100644
--- a/include/math.h
+++ b/include/math.h
@@ -5,4 +5,27 @@
 /* Now define the internal interfaces.  */
 extern int __matherr (struct exception *__exc);
 
+extern int __finite_internal (double __value)
+     __attribute__ ((__const__)) attribute_hidden;
+extern int __finitef_internal (float __value)
+     __attribute__ ((__const__)) attribute_hidden;
+extern int __finitel_internal (long double __value)
+     __attribute__ ((__const__)) attribute_hidden;
+
+#if !defined NOT_IN_libc || defined IS_IN_libm
+# undef isfinite
+# ifdef __NO_LONG_DOUBLE_MATH
+#  define isfinite(x) \
+     (sizeof (x) == (sizeof (float)					      \
+		     ? INTUSE(__finitef) (x) : INTUSE(__finite) (x)))
+# else
+#  define isfinite(x) \
+     (sizeof (x) == sizeof (float)					      \
+      ? INTUSE(__finitef) (x)						      \
+      : sizeof (x) == sizeof (double)					      \
+      ? INTUSE(__finite) (x) : INTUSE(__finitel) (x))
+# endif
+#endif
+
+
 #endif