commit 48746aa5a013aab5ca89ee8c29761baec8850c0f
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Mon Feb 1 16:17:55 2016 +0000

    Restore isinf, isinfl, isnanf and isnanl for C++11

diff --git a/math/bits/mathcalls.h b/math/bits/mathcalls.h
index a48345d..9a7b3f0 100644
--- a/math/bits/mathcalls.h
+++ b/math/bits/mathcalls.h
@@ -196,7 +196,9 @@ __MATHDECL_1 (int,__finite,, (_Mdouble_ __value)) __attribute__ ((__const__));
 _Mdouble_END_NAMESPACE
 
 #ifdef __USE_MISC
-# if !defined __cplusplus || __cplusplus < 201103L /* Conflicts with C++11.  */
+# if (!defined __cplusplus \
+      || __cplusplus < 201103L /* isinf conflicts with C++11.  */ \
+      || __MATH_DECLARING_DOUBLE == 0) /* isinff or isinfl don't.  */
 /* Return 0 if VALUE is finite or NaN, +1 if it
    is +Infinity, -1 if it is -Infinity.  */
 __MATHDECL_1 (int,isinf,, (_Mdouble_ __value)) __attribute__ ((__const__));
@@ -232,7 +234,9 @@ __END_NAMESPACE_C99
 __MATHDECL_1 (int,__isnan,, (_Mdouble_ __value)) __attribute__ ((__const__));
 
 #if defined __USE_MISC || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
-# if !defined __cplusplus || __cplusplus < 201103L /* Conflicts with C++11.  */
+# if (!defined __cplusplus \
+      || __cplusplus < 201103L /* isnan conflicts with C++11.  */ \
+      || __MATH_DECLARING_DOUBLE == 0) /* isnanf or isnanl don't.  */
 /* Return nonzero if VALUE is not a number.  */
 __MATHDECL_1 (int,isnan,, (_Mdouble_ __value)) __attribute__ ((__const__));
 # endif