[committed] libstdc++: Qualify calls to std::_Destroy and _Destroy_aux

[Jonathan Wakely via Gcc-patches]

Tested x86_64-linux. Pushed to trunk.

This isn't a regression, but is safe to backport.

-- >8 --

These calls should be qualified to prevent ADL, which can cause errors
for incomplete types that are associated classes.

libstdc++-v3/ChangeLog:

        * include/bits/alloc_traits.h (_Destroy): Qualify call.
        * include/bits/stl_construct.h (_Destroy, _Destroy_n): Likewise.
        * testsuite/23_containers/vector/cons/destroy-adl.cc: New test.
---
 libstdc++-v3/include/bits/alloc_traits.h              |  2 +-
 libstdc++-v3/include/bits/stl_construct.h             |  4 ++--
 .../23_containers/vector/cons/destroy-adl.cc          | 11 +++++++++++
 3 files changed, 14 insertions(+), 3 deletions(-)
 create mode 100644 
libstdc++-v3/testsuite/23_containers/vector/cons/destroy-adl.cc

diff --git a/libstdc++-v3/include/bits/alloc_traits.h 
b/libstdc++-v3/include/bits/alloc_traits.h
index cd91d152f64..182c3e23eed 100644
--- a/libstdc++-v3/include/bits/alloc_traits.h
+++ b/libstdc++-v3/include/bits/alloc_traits.h
@@ -944,7 +944,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     _Destroy(_ForwardIterator __first, _ForwardIterator __last,
             allocator<_Tp>&)
     {
-      _Destroy(__first, __last);
+      std::_Destroy(__first, __last);
     }
 #endif
   /// @endcond
diff --git a/libstdc++-v3/include/bits/stl_construct.h 
b/libstdc++-v3/include/bits/stl_construct.h
index 574f4fa50b4..cf62d927cdb 100644
--- a/libstdc++-v3/include/bits/stl_construct.h
+++ b/libstdc++-v3/include/bits/stl_construct.h
@@ -190,7 +190,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #endif
 #if __cplusplus >= 202002L
       if (std::__is_constant_evaluated())
-       return _Destroy_aux<false>::__destroy(__first, __last);
+       return std::_Destroy_aux<false>::__destroy(__first, __last);
 #endif
       std::_Destroy_aux<__has_trivial_destructor(_Value_type)>::
        __destroy(__first, __last);
@@ -239,7 +239,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #endif
 #if __cplusplus >= 202002L
       if (std::__is_constant_evaluated())
-       return _Destroy_n_aux<false>::__destroy_n(__first, __count);
+       return std::_Destroy_n_aux<false>::__destroy_n(__first, __count);
 #endif
       return std::_Destroy_n_aux<__has_trivial_destructor(_Value_type)>::
        __destroy_n(__first, __count);
diff --git a/libstdc++-v3/testsuite/23_containers/vector/cons/destroy-adl.cc 
b/libstdc++-v3/testsuite/23_containers/vector/cons/destroy-adl.cc
new file mode 100644
index 00000000000..5623842e9b1
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/vector/cons/destroy-adl.cc
@@ -0,0 +1,11 @@
+// { dg-do compile }
+
+#include <vector>
+
+template<class T> struct Holder { T t; }; // { dg-bogus "incomplete type" }
+struct Incomplete;
+
+void destroy(std::vector<Holder<Incomplete>*>* p)
+{
+  p->~vector();
+}
-- 
2.41.0