Constrain std::valarray functions and operators

	PR libstdc++/69116
	* include/bits/valarray_before.h (__fun, __fun_with_valarray): Only
	define result_type for types which can be safely used with valarrays.
	* testsuite/26_numerics/valarray/69116.cc: New.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@232748 138bc75d-0d04-0410-961f-82ee72b054a4

3 files changed, 70 insertions, 2 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 77ab6b31db1..f7e4ea0224b 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,10 @@
 2016-01-22  Jonathan Wakely  <jwakely@redhat.com>
 
+	PR libstdc++/69116
+	* include/bits/valarray_before.h (__fun, __fun_with_valarray): Only
+	define result_type for types which can be safely used with valarrays.
+	* testsuite/26_numerics/valarray/69116.cc: New.
+
 	PR libstdc++/69413
 	* config/os/gnu-linux/os_defines.h: Define
 	_GLIBCXX_NO_OBSOLETE_ISINF_ISNAN_DYNAMIC.
diff --git a/libstdc++-v3/include/bits/valarray_before.h b/libstdc++-v3/include/bits/valarray_before.h
index 3325bf8058f..86136f438ce 100644
--- a/libstdc++-v3/include/bits/valarray_before.h
+++ b/libstdc++-v3/include/bits/valarray_before.h
@@ -331,14 +331,24 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       { return pow(__x, __y); }
   };
 
+  template<typename _Tp, bool _IsValidValarrayValue = !__is_abstract(_Tp)>
+    struct __fun_with_valarray
+    {
+      typedef _Tp result_type;
+    };
+
+  template<typename _Tp>
+    struct __fun_with_valarray<_Tp, false>
+    {
+      // No result type defined for invalid value types.
+    };
 
   // We need these bits in order to recover the return type of
   // some functions/operators now that we're no longer using
   // function templates.
   template<typename, typename _Tp>
-    struct __fun
+    struct __fun : __fun_with_valarray<_Tp>
     {
-      typedef _Tp result_type;
     };
 
   // several specializations for relational operators.
diff --git a/libstdc++-v3/testsuite/26_numerics/valarray/69116.cc b/libstdc++-v3/testsuite/26_numerics/valarray/69116.cc
new file mode 100644
index 00000000000..ef9826778cf
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/valarray/69116.cc
@@ -0,0 +1,53 @@
+// Copyright (C) 2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-do compile }
+// { dg-options "-std=gnu++98" }
+
+// libstdc++/69116
+
+#include <exception>
+#include <valarray>
+
+template<typename T>
+  void foo(const T&) { }
+
+struct X : std::exception // makes namespace std an associated namespace
+{
+  virtual void pure() = 0;
+
+  typedef void(*func_type)(const X&);
+
+  void operator+(func_type) const;
+  void operator-(func_type) const;
+  void operator*(func_type) const;
+  void operator/(func_type) const;
+  void operator%(func_type) const;
+  void operator<<(func_type) const;
+  void operator>>(func_type) const;
+};
+
+void foo(X& x)
+{
+  x + foo;
+  x - foo;
+  x * foo;
+  x / foo;
+  x % foo;
+  x << foo;
+  x >> foo;
+}