From 635d3557e52e883d8cc756fdefd7248791c58b56 Mon Sep 17 00:00:00 2001
From: ferdymercury <ferdymercury@users.noreply.github.com>
Date: Wed, 16 Sep 2026 21:09:02 +0200
Subject: [PATCH] [tree] deprecate implementation detail header

---
 README/ReleaseNotes/v642/index.md   | 1 +
 tree/treeviewer/inc/HelpTextTV.h    | 3 +++
 tree/treeviewer/src/HelpTextTV.cxx  | 1 +
 tree/treeviewer/src/TTreeViewer.cxx | 1 +
 4 files changed, 6 insertions(+)

diff --git a/README/ReleaseNotes/v642/index.md b/README/ReleaseNotes/v642/index.md
index 61c80c9c5b822..153cc9ae99ab8 100644
--- a/README/ReleaseNotes/v642/index.md
+++ b/README/ReleaseNotes/v642/index.md
@@ -79,6 +79,7 @@ The `TMVA_SOFIE_GNN` tutorials have been migrated to this workflow and produce i
 * The header `RStringView.h` deprecated in ROOT 6.14  will now emit warnings and will be fully removed after ROOT 6.44. Use `ROOT/RStringView.hxx` instead.
 * The header `snprintf.h` is deprecated (will emit warnings) and will be removed in ROOT 6.44. Use instead `<cstdio>`.
 * The header `Strlen.h` is deprecated and will be removed in ROOT 6.44. Use `<cstring>` directly as a replacement. `NEED_STRING` macro should not be defined or an error will be raised.
+* The header `HelpTextTV.h` is deprecated and will be removed in ROOT 6.44.
 * The header `Varargs.h` and the macro `R__VA_COPY` are deprecated and will be removed in ROOT 6.46, use `<cstdarg>` instead.
 * The header `Riostream.h` is deprecated and will be removed after ROOT 6.44, use `<iostream>` or `<fstream>` or `<iomanip>` instead.
 * The header `Rstrstream.h` is deprecated and will be removed after ROOT 6.44, use instead `<sstream>`.
diff --git a/tree/treeviewer/inc/HelpTextTV.h b/tree/treeviewer/inc/HelpTextTV.h
index 0db7bf42a6a62..c22612597c84e 100644
--- a/tree/treeviewer/inc/HelpTextTV.h
+++ b/tree/treeviewer/inc/HelpTextTV.h
@@ -12,6 +12,9 @@
 #ifndef ROOT_HelpTextTV
 #define ROOT_HelpTextTV
 
+#if !defined(ROOT_HelpTextTV_cxx) && !defined(G__DICTIONARY)
+#warning "This header is deprecated and will be removed in ROOT 6.44"
+#endif
 #include <RtypesCore.h>
 
 R__EXTERN const char gTVHelpAbout[];
diff --git a/tree/treeviewer/src/HelpTextTV.cxx b/tree/treeviewer/src/HelpTextTV.cxx
index 86642bc59148f..806ef1b5e243e 100644
--- a/tree/treeviewer/src/HelpTextTV.cxx
+++ b/tree/treeviewer/src/HelpTextTV.cxx
@@ -9,6 +9,7 @@
  * For the list of contributors see $ROOTSYS/README/CREDITS.             *
  *************************************************************************/
 
+#define ROOT_HelpTextTV_cxx
 #include "HelpTextTV.h"
 
 const char gTVHelpAbout[] = "\
diff --git a/tree/treeviewer/src/TTreeViewer.cxx b/tree/treeviewer/src/TTreeViewer.cxx
index 5f0becb1bdb93..f8262cbf214fc 100644
--- a/tree/treeviewer/src/TTreeViewer.cxx
+++ b/tree/treeviewer/src/TTreeViewer.cxx
@@ -200,6 +200,7 @@ more complex cuts such as (~e1) && (~e2), or (~e1) || !(~e2). Parentheses are im
 
 #include "TTreeViewer.h"
 #include "HelpText.h"
+#define ROOT_HelpTextTV_cxx
 #include "HelpTextTV.h"
 #include "TTVLVContainer.h"
 #include "TTVSession.h"