From 0116a9aa9f6f5a53814ac51ad10a2a8ad74cad29 Mon Sep 17 00:00:00 2001
From: Jonas Devlieghere <jonas@devlieghere.com>
Date: Mon, 13 Oct 2025 14:36:25 -0700
Subject: [PATCH] [lldb-mcp] Register a NoOpMonitorCallback when launching lldb
 from lldb-mcp

Register a callback to avoid tripping the monitor assertion in
LaunchProcess on Darwin.

Fixes #163269
---
 lldb/tools/lldb-mcp/lldb-mcp.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lldb/tools/lldb-mcp/lldb-mcp.cpp b/lldb/tools/lldb-mcp/lldb-mcp.cpp
index 68e987237cc69..3fc362232ba6c 100644
--- a/lldb/tools/lldb-mcp/lldb-mcp.cpp
+++ b/lldb/tools/lldb-mcp/lldb-mcp.cpp
@@ -85,6 +85,8 @@ FileSpec driverPath() {
 llvm::Error launch() {
   FileSpec lldb_exec = driverPath();
   lldb_private::ProcessLaunchInfo info;
+  info.SetMonitorProcessCallback(
+      &lldb_private::ProcessLaunchInfo::NoOpMonitorCallback);
   info.SetExecutableFile(lldb_exec,
                          /*add_exe_file_as_first_arg=*/true);
   info.GetArguments().AppendArgument("-O");