File gdb-symtab-handle-nullptr-parent-in-parent_map-set_p.patch of Package gdb

From bc970668f83cf142c4955d1cbeaa24e8bcc4b238 Mon Sep 17 00:00:00 2001
From: Tom de Vries <tdevries@suse.de>
Date: Fri, 25 Aug 2023 09:30:54 +0200
Subject: [PATCH 03/13] [gdb/symtab] Handle nullptr parent in
 parent_map::set_parent

Set_parent uses m_die_range_map.set_empty, which doesn't allow
parent_entry == nullptr.

So it may be necessary to guard calls to set_parent with
"if (parent_entry != nullptr)".

Fix this by handling the parent_entry == nullptr case in set_parent.

Tested on x86_64-linux.
---
 gdb/dwarf2/cooked-index.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gdb/dwarf2/cooked-index.h b/gdb/dwarf2/cooked-index.h
index 979541fbf60..79fbfe88c03 100644
--- a/gdb/dwarf2/cooked-index.h
+++ b/gdb/dwarf2/cooked-index.h
@@ -263,7 +263,9 @@ class parent_map
   void set_parent (CORE_ADDR start, CORE_ADDR end,
 		   const cooked_index_entry *parent_entry)
   {
-    m_parent_map.set_empty (start, end, (void *)parent_entry);
+    /* Calling set_empty with nullptr is currently not allowed.  */
+    if (parent_entry != nullptr)
+      m_parent_map.set_empty (start, end, (void *)parent_entry);
   }
 
 private:
-- 
2.35.3