[gcc r13-8059] libstdc++: Define _versioned_namespace in xmethods.py

[gcc r13-8059] libstdc++: Define _versioned_namespace in xmethods.py

[Jonathan Wakely]

https://gcc.gnu.org/g:cc2e2291a2820929ff6562cc375f53e2f1713ac5

commit r13-8059-gcc2e2291a2820929ff6562cc375f53e2f1713ac5
Author: Tom Tromey <tromey@adacore.com>
Date:   Tue Oct 3 11:08:02 2023 -0600

    libstdc++: Define _versioned_namespace in xmethods.py
    
    flake8 pointed out that is_specialization_of in xmethods.py looks at a
    global that wasn't added to the file.  This patch correct the
    oversight.
    
    libstdc++-v3/ChangeLog:
    
            * python/libstdcxx/v6/xmethods.py (_versioned_namespace):
            Define.
    
    (cherry picked from commit 83ec6e80ff0d56342fc066c2ef649036c0983529)

Diff:
---
 libstdc++-v3/python/libstdcxx/v6/xmethods.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libstdc++-v3/python/libstdcxx/v6/xmethods.py b/libstdc++-v3/python/libstdcxx/v6/xmethods.py
index 844c8a2105a..8ccf57c4d6b 100644
--- a/libstdc++-v3/python/libstdcxx/v6/xmethods.py
+++ b/libstdc++-v3/python/libstdcxx/v6/xmethods.py
@@ -28,6 +28,8 @@ def get_bool_type():
 def get_std_size_type():
     return gdb.lookup_type('std::size_t')
 
+_versioned_namespace = '__8::'
+
 def is_specialization_of(x, template_name):
     """
     Test whether a type is a specialization of the named class template.