[gcc r16-5545] libstdc++: Fix XMethods for debug mode [PR122821]

[Jonathan Wakely]

https://gcc.gnu.org/g:ca948ee810949179aac598a14a714ec9550dd9c6

commit r16-5545-gca948ee810949179aac598a14a714ec9550dd9c6
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Nov 24 12:36:32 2025 +0000

    libstdc++: Fix XMethods for debug mode [PR122821]
    
    The Python GDB XMethods were not matching the debug mode containers,
    because the is_specialization_of helper function matches std::(__\d::)?
    and so fails to match std::__debug::deque etc.
    
    This makes it match std::__debug:: as well as std:: and std::__8::.
    
    Since the regex already handles the versioned namespace with (__\d::)?
    we don't need to also include the _versioned_namespace variable
    explicitly. This means we now match std::(__\d::|__debug::)?name<.*>
    instead of matching std::(__\d::)?(__8::)?name<.*> which redundantly
    included two ways to match the __8 versioned namespace.
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/122821
            * python/libstdcxx/v6/xmethods.py (_versioned_namespace): Remove
            global variable.
            (is_specialization_of): Do not use _versioned_namespace. Add
            __debug:: to regex.

Diff:
---
 libstdc++-v3/python/libstdcxx/v6/xmethods.py | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/libstdc++-v3/python/libstdcxx/v6/xmethods.py b/libstdc++-v3/python/libstdcxx/v6/xmethods.py
index 109ca10956ab..30359c50b6f9 100644
--- a/libstdc++-v3/python/libstdcxx/v6/xmethods.py
+++ b/libstdc++-v3/python/libstdcxx/v6/xmethods.py
@@ -28,8 +28,6 @@ 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.
@@ -39,8 +37,7 @@ def is_specialization_of(x, template_name):
     """
     if isinstance(x, gdb.Type):
         x = x.tag
-    template_name = '(%s)?%s' % (_versioned_namespace, template_name)
-    return re.match(r'^std::(__\d::)?%s<.*>$' % template_name, x) is not None
+    return re.match(r'^std::(__\d::|__debug::)?%s<.*>$' % template_name, x) is not None
 
 class LibStdCxxXMethod(gdb.xmethod.XMethod):
     def __init__(self, name, worker_class):