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diff --git a/sysdeps/ieee754/ldbl-opt/libm-alias-ldouble.h b/sysdeps/ieee754/ldbl-opt/libm-alias-ldouble.h
new file mode 100644
index 0000000000..df9172b333
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+++ b/sysdeps/ieee754/ldbl-opt/libm-alias-ldouble.h
@@ -0,0 +1,69 @@
+/* Define aliases for libm long double functions.  ldbl-opt version.
+   Copyright (C) 2017-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _LIBM_ALIAS_LDOUBLE_H
+#define _LIBM_ALIAS_LDOUBLE_H
+
+#include <bits/floatn.h>
+#include <math_ldbl_opt.h>
+#include <ldbl-compat-choose.h>
+
+#if __HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128
+# define libm_alias_ldouble_other_r_f128(from, to, r)	\
+  weak_alias (from ## l ## r, to ## f128 ## r)
+#else
+# define libm_alias_ldouble_other_r_f128(from, to, r)
+#endif
+
+#if __HAVE_FLOAT64X_LONG_DOUBLE
+# define libm_alias_ldouble_other_r_f64x(from, to, r)	\
+  weak_alias (from ## l ## r, to ## f64x ## r)
+#else
+# define libm_alias_ldouble_other_r_f64x(from, to, r)
+#endif
+
+/* Define _FloatN / _FloatNx aliases for a long double libm function
+   that has internal name FROM ## l ## R and public names TO ## suffix
+   ## R for each suffix of a supported _FloatN / _FloatNx
+   floating-point type with the same format as long double.  */
+#define libm_alias_ldouble_other_r(from, to, r)		\
+  libm_alias_ldouble_other_r_f128 (from, to, r);	\
+  libm_alias_ldouble_other_r_f64x (from, to, r)
+
+/* Likewise, but without the R suffix.  */
+#define libm_alias_ldouble_other(from, to)	\
+  libm_alias_ldouble_other_r (from, to, )
+
+/* Define aliases for a long double libm function that has internal
+   name FROM ## l ## R and public names TO ## suffix ## R for each
+   suffix of a supported floating-point type with the same format as
+   long double.  This should only be used for functions where such
+   public names exist for _FloatN types, not for
+   implementation-namespace exported names (where there is one name
+   per format, not per type) or for obsolescent functions not provided
+   for _FloatN types.  */
+#define libm_alias_ldouble_r(from, to, r)			\
+  LONG_DOUBLE_COMPAT_CHOOSE_libm_ ## to ## l ## r		\
+    (long_double_symbol (libm, from ## l ## r, to ## l ## r),	\
+     weak_alias (from ## l ## r, to ## l ## r));		\
+  libm_alias_ldouble_other_r (from, to, r)
+
+/* Likewise, but without the R suffix.  */
+#define libm_alias_ldouble(from, to) libm_alias_ldouble_r (from, to, )
+
+#endif