re PR libstdc++/65420 (Enumerators in std::regex_constants should be constexpr variables instead)

	PR libstdc++/65420
	* include/bits/regex_constants.h: Use constexpr variables for flags.
	* testsuite/28_regex/constants/constexpr.cc: New testcase.

From-SVN: r221750

libstdc++-v3/ChangeLog

+2015-03-28  Tim Shen  <timshen@google.com>
+
+	PR libstdc++/65420
+	* include/bits/regex_constants.h: Use constexpr variables for flags.
+	* testsuite/28_regex/constants/constexpr.cc: New testcase.
+
 2015-03-27  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/65499

libstdc++-v3/testsuite/28_regex/constants/constexpr.cc

+// { dg-options "-std=gnu++11" }
+// { dg-do compile }
+//
+// Copyright (C) 2015 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/>.
+
+// 28.5.4
+
+#include <regex>
+
+// libstdc++/65420
+void
+test01()
+{
+  const std::regex_constants::syntax_option_type* option __attribute__((unused));
+  option = &std::regex_constants::icase;
+  option = &std::regex_constants::nosubs;
+  option = &std::regex_constants::optimize;
+  option = &std::regex_constants::collate;
+  option = &std::regex_constants::ECMAScript;
+  option = &std::regex_constants::basic;
+  option = &std::regex_constants::extended;
+  option = &std::regex_constants::awk;
+  option = &std::regex_constants::grep;
+  option = &std::regex_constants::egrep;
+
+  const std::regex_constants::match_flag_type* flag __attribute__((unused));
+  flag = &std::regex_constants::match_not_bol;
+  flag = &std::regex_constants::match_not_eol;
+  flag = &std::regex_constants::match_not_bow;
+  flag = &std::regex_constants::match_not_eow;
+  flag = &std::regex_constants::match_any;
+  flag = &std::regex_constants::match_not_null;
+  flag = &std::regex_constants::match_continuous;
+  flag = &std::regex_constants::match_prev_avail;
+  flag = &std::regex_constants::format_default;
+  flag = &std::regex_constants::format_sed;
+  flag = &std::regex_constants::format_no_copy;
+  flag = &std::regex_constants::format_first_only;
+}
+
+int main()
+{
+  test01();
+  return 0;
+}