[gcc r16-6992] libstdc++: Explicitly call _Mo_base() in _Cpy_base copy-constructor [PR123758]

[Tomasz Kaminski]

https://gcc.gnu.org/g:d7e5113e592c54c5893ba096791e1f1eddf7684d

commit r16-6992-gd7e5113e592c54c5893ba096791e1f1eddf7684d
Author: Tomasz Kamiński <tkaminsk@redhat.com>
Date:   Fri Jan 23 11:09:08 2026 +0100

    libstdc++: Explicitly call _Mo_base() in _Cpy_base copy-constructor [PR123758]
    
    This silences the warning while preserving current (correct) behavior.
    
            PR libstdc++/123758
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/funcwrap.h (_Cpy_base(_Cpy_base const&)):
            Explicitly call _Mo_base() in initializer list.

Diff:
---
 libstdc++-v3/include/bits/funcwrap.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libstdc++-v3/include/bits/funcwrap.h b/libstdc++-v3/include/bits/funcwrap.h
index 67fd591e9635..b8dd6fb7aeae 100644
--- a/libstdc++-v3/include/bits/funcwrap.h
+++ b/libstdc++-v3/include/bits/funcwrap.h
@@ -495,6 +495,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       _Cpy_base(_Cpy_base&&) = default;
 
       _Cpy_base(_Cpy_base const& __x)
+      : _Mo_base()
       { _M_copy(__x); }
 
       _Cpy_base&