re PR c/88430 (-Wmissing-attributes warnings when including libquadmath headers)

	PR c/88430
	* quadmath_weak.h (__qmath2): Add __quadmath_throw.

From-SVN: r266972

libquadmath/ChangeLog

+2018-12-11  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/88430
+	* quadmath_weak.h (__qmath2): Add __quadmath_throw.
+
 2018-11-07  Joseph Myers  <joseph@codesourcery.com>
 
 	* quadmath-imp.h (ieee854_float128): Use mantissa0, mantissa1,

libquadmath/quadmath_weak.h

 /* GCC Quad-Precision Math Library
-   Copyright (C) 2010, 2011 Free Software Foundation, Inc.
+   Copyright (C) 2010-2018 Free Software Foundation, Inc.
    Written by Tobias Burnus  <burnus@net-b.de>
 
 This file is part of the libquadmath library.
@@ -25,7 +25,8 @@ Boston, MA 02110-1301, USA.  */
 
 #if SUPPORTS_WEAK
 # define __qmath2(name,name2,type) \
-  static __typeof(type) name __attribute__ ((__weakref__(#name2)));
+  static __typeof(type) name __attribute__ ((__weakref__(#name2))) \
+			__quadmath_throw;
 # define __qmath_(name) __qmath_ ## name
 #else
 # define __qmath2(name,name2,type)