// 3076. basic_string CTAD ambiguity
template<typename = _RequireAllocator<_Alloc>>
#endif
+ __attribute__((__nonnull__))
basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
: _M_dataplus(_M_local_data(), __a)
{ _M_construct(__s, __s ? __s + traits_type::length(__s) : __s+npos); }
--- /dev/null
+// Copyright (C) 2020 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-additional-options "-Wnonnull" }
+// { dg-do compile { target c++11 } }
+
+#include <string>
+
+void
+test01()
+{
+ std::string s((const char*)nullptr); // { dg-warning "null arg" }
+ std::string t((char*)nullptr); // { dg-warning "null arg" }
+ std::string u(nullptr); // { dg-warning "null arg" }
+}
--- /dev/null
+// Copyright (C) 2020 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-additional-options "-Wnonnull" }
+// { dg-do compile { target c++11 } }
+
+#include <string>
+
+void
+test01()
+{
+ std::wstring s((const wchar_t*)nullptr); // { dg-warning "null arg" }
+ std::wstring t((wchar_t*)nullptr); // { dg-warning "null arg" }
+ std::wstring u(nullptr); // { dg-warning "null arg" }
+}