I find it quite convenient so maybe you'll accept it.
Note that looking for existence of this macro I noticed that
ChangeLog-2024 is wrongly talking about _GLIBCXX_USE_ALLOC_PTR_FOR_LIST
in <forward_list> header. Should it be fixed ?
libstdc++: Add _GLIBCXX_USE_ALLOC_PTR macro to rule them all
Provide a unique way to control usage of the allocator pointer type
through a single
macro: _GLIBCXX_USE_ALLOC_PTR. If defined is used to set the value
of the following
macros: _GLIBCXX_USE_ALLOC_PTR_FOR_LIST,
_GLIBCXX_USE_ALLOC_PTR_FOR_FORWARD_LIST
and _GLIBCXX_USE_ALLOC_PTR_FOR_RB_TREE.
libstdc++-v3/ChangeLog:
* include/bits/forward_list.h
[_GLIBCXX_USE_ALLOC_PTR_FOR_FORWARD_LIST]:
Default to _GLIBCXX_USE_ALLOC_PTR if defined.
* include/bits/stl_list.h [_GLIBCXX_USE_ALLOC_PTR_FOR_LIST]:
Likewise.
* include/bits/stl_tree.h [_GLIBCXX_USE_ALLOC_PTR_FOR_RB_TREE]:
Likewise.
Tested under Linux x86_64,
ok to commit ?
François
diff --git a/libstdc++-v3/include/bits/forward_list.h
b/libstdc++-v3/include/bits/forward_list.h
index 8bcfb809319..b79fc7fea86 100644
--- a/libstdc++-v3/include/bits/forward_list.h
+++ b/libstdc++-v3/include/bits/forward_list.h
@@ -52,7 +52,11 @@
#endif
#if ! defined _GLIBCXX_USE_ALLOC_PTR_FOR_FWD_LIST
-# define _GLIBCXX_USE_ALLOC_PTR_FOR_FWD_LIST 1
+# ifdef _GLIBCXX_USE_ALLOC_PTR
+# define _GLIBCXX_USE_ALLOC_PTR_FOR_FWD_LIST _GLIBCXX_USE_ALLOC_PTR
+# else
+# define _GLIBCXX_USE_ALLOC_PTR_FOR_FWD_LIST 1
+# endif
#endif
namespace std _GLIBCXX_VISIBILITY(default)
diff --git a/libstdc++-v3/include/bits/stl_list.h
b/libstdc++-v3/include/bits/stl_list.h
index d27824c0a7a..ab4271f0e26 100644
--- a/libstdc++-v3/include/bits/stl_list.h
+++ b/libstdc++-v3/include/bits/stl_list.h
@@ -75,7 +75,11 @@
# undef _GLIBCXX_USE_ALLOC_PTR_FOR_LIST
# define _GLIBCXX_USE_ALLOC_PTR_FOR_LIST 0
#elif ! defined _GLIBCXX_USE_ALLOC_PTR_FOR_LIST
-# define _GLIBCXX_USE_ALLOC_PTR_FOR_LIST 1
+# ifdef _GLIBCXX_USE_ALLOC_PTR
+# define _GLIBCXX_USE_ALLOC_PTR_FOR_LIST _GLIBCXX_USE_ALLOC_PTR
+# else
+# define _GLIBCXX_USE_ALLOC_PTR_FOR_LIST 1
+# endif
#endif
namespace std _GLIBCXX_VISIBILITY(default)
diff --git a/libstdc++-v3/include/bits/stl_tree.h
b/libstdc++-v3/include/bits/stl_tree.h
index 4b7f482e794..4fa2be1b7b7 100644
--- a/libstdc++-v3/include/bits/stl_tree.h
+++ b/libstdc++-v3/include/bits/stl_tree.h
@@ -79,7 +79,11 @@
# undef _GLIBCXX_USE_ALLOC_PTR_FOR_RB_TREE
# define _GLIBCXX_USE_ALLOC_PTR_FOR_RB_TREE 0
#elif ! defined _GLIBCXX_USE_ALLOC_PTR_FOR_RB_TREE
-# define _GLIBCXX_USE_ALLOC_PTR_FOR_RB_TREE 1
+# ifdef _GLIBCXX_USE_ALLOC_PTR
+# define _GLIBCXX_USE_ALLOC_PTR_FOR_RB_TREE _GLIBCXX_USE_ALLOC_PTR
+# else
+# define _GLIBCXX_USE_ALLOC_PTR_FOR_RB_TREE 1
+# endif
#endif
namespace std _GLIBCXX_VISIBILITY(default)
