From 2d31f199cc9ac0c5899e9888db29db9752ef6206 Mon Sep 17 00:00:00 2001
From: Jonas Devlieghere <jonas@devlieghere.com>
Date: Wed, 5 Nov 2025 09:47:51 -0800
Subject: [PATCH] [debugserver] Fix debugserver build on < macOS 10.15

The VM_MEMORY_SANITIZER was added in macOs 10.15 and friends. Support
using the constant on older OSes.

Fixes #156144
---
 lldb/tools/debugserver/source/MacOSX/MachVMRegion.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lldb/tools/debugserver/source/MacOSX/MachVMRegion.cpp b/lldb/tools/debugserver/source/MacOSX/MachVMRegion.cpp
index 9d0d60fdaaed9..c8dce75af05eb 100644
--- a/lldb/tools/debugserver/source/MacOSX/MachVMRegion.cpp
+++ b/lldb/tools/debugserver/source/MacOSX/MachVMRegion.cpp
@@ -14,6 +14,12 @@
 #include "DNBLog.h"
 #include <cassert>
 #include <mach/mach_vm.h>
+#include <mach/vm_statistics.h>
+
+// From <mach/vm_statistics.h>, but not on older OSs.
+#ifndef VM_MEMORY_SANITIZER
+#define VM_MEMORY_SANITIZER 99
+#endif
 
 MachVMRegion::MachVMRegion(task_t task)
     : m_task(task), m_addr(INVALID_NUB_ADDRESS), m_err(),