[Patch] Fix regex `nosubs` correctly

[Tim Shen]

The semantic of `nosubs` should simply be that `let all parentheses
not be a subexpression and do not capture it`.

Tested with -m64 and -m32 respectively.

Thank you!


-- 
Regards,
Tim Shen

commit 6972b7eb795adb462182ec96684cc94b7bb8a338
Author: tim <timshe...@gmail.com>
Date:   Mon Jan 20 17:33:44 2014 -0500

    2014-01-19  Tim Shen  <timshe...@gmail.com>
    
        * include/bits/regex.tcc: Remove incorrect `nosubs` handling.
        * include/bits/regex_scanner.tcc: Handle `nosubs` correctly.
        * testsuite/28_regex/constants/syntax_option_type.cc: Add a test case.

diff --git a/libstdc++-v3/include/bits/regex.tcc 
b/libstdc++-v3/include/bits/regex.tcc
index 1ceac60..73f55df 100644
--- a/libstdc++-v3/include/bits/regex.tcc
+++ b/libstdc++-v3/include/bits/regex.tcc
@@ -126,8 +126,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
              __suf.second = __e;
              __suf.matched = (__suf.first != __suf.second);
            }
-         if (__re.flags() & regex_constants::nosubs)
-           __res.resize(3);
        }
       return __ret;
     }
diff --git a/libstdc++-v3/include/bits/regex_scanner.tcc 
b/libstdc++-v3/include/bits/regex_scanner.tcc
index d954d07..5332d2e 100644
--- a/libstdc++-v3/include/bits/regex_scanner.tcc
+++ b/libstdc++-v3/include/bits/regex_scanner.tcc
@@ -139,6 +139,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
              else
                __throw_regex_error(regex_constants::error_paren);
            }
+         else if (_M_flags & regex_constants::nosubs)
+           _M_token = _S_token_subexpr_no_group_begin;
          else
            _M_token = _S_token_subexpr_begin;
        }
diff --git a/libstdc++-v3/testsuite/28_regex/constants/syntax_option_type.cc 
b/libstdc++-v3/testsuite/28_regex/constants/syntax_option_type.cc
index 22559f5..2423775 100644
--- a/libstdc++-v3/testsuite/28_regex/constants/syntax_option_type.cc
+++ b/libstdc++-v3/testsuite/28_regex/constants/syntax_option_type.cc
@@ -1,5 +1,4 @@
 // { dg-options "-std=c++0x" }
-// { dg-do compile }
 //
 // 2009-06-17  Stephen M. Webb  <stephen.w...@xandros.com>
 //
@@ -23,6 +22,7 @@
 // 28.5.1 
 
 #include <regex>
+#include <testsuite_hooks.h>
 
 void
 test01()
@@ -82,10 +82,21 @@ test04_constexpr()
   constexpr auto a3 __attribute__((unused)) = ~grep;
 }
 
+void
+test05()
+{
+  using namespace std;
+  using namespace regex_constants;
+  regex re("((a)(s))", nosubs | ECMAScript);
+  VERIFY(re.mark_count() == 0);
+}
+
 int main()
 {
   test01();
   test02();
   test03();
+  test04_constexpr();
+  test05();
   return 0;
 }