[Lldb-commits] [lldb] [lldb] Use the Python limited API with SWIG 4.2 or later (PR #153119)

[Jonas Devlieghere via lldb-commits]

https://github.com/JDevlieghere created https://github.com/llvm/llvm-project/pull/153119

Use the Python limited API when building with SWIG 4.2 or later.

>From e002f15ff6f14e1288e5da97bed0537d2a7802fa Mon Sep 17 00:00:00 2001
From: Jonas Devlieghere <jonas at devlieghere.com>
Date: Mon, 11 Aug 2025 18:21:09 -0700
Subject: [PATCH] [lldb] Use the Python limited API with SWIG 4.2 or later

Use the Python limited API when building with SWIG 4.2 or later.
---
 lldb/cmake/modules/LLDBConfig.cmake | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lldb/cmake/modules/LLDBConfig.cmake b/lldb/cmake/modules/LLDBConfig.cmake
index a9679d63e010d..ca574a142b9dd 100644
--- a/lldb/cmake/modules/LLDBConfig.cmake
+++ b/lldb/cmake/modules/LLDBConfig.cmake
@@ -68,7 +68,6 @@ add_optional_dependency(LLDB_ENABLE_FBSDVMCORE "Enable libfbsdvmcore support in
 option(LLDB_USE_ENTITLEMENTS "When codesigning, use entitlements if available" ON)
 option(LLDB_BUILD_FRAMEWORK "Build LLDB.framework (Darwin only)" OFF)
 option(LLDB_ENABLE_PROTOCOL_SERVERS "Enable protocol servers (e.g. MCP) in LLDB" ON)
-option(LLDB_ENABLE_PYTHON_LIMITED_API "Force LLDB to only use the Python Limited API (requires SWIG 4.2 or later)" OFF)
 option(LLDB_NO_INSTALL_DEFAULT_RPATH "Disable default RPATH settings in binaries" OFF)
 option(LLDB_USE_SYSTEM_DEBUGSERVER "Use the system's debugserver for testing (Darwin only)." OFF)
 option(LLDB_SKIP_STRIP "Whether to skip stripping of binaries when installing lldb." OFF)
@@ -173,6 +172,14 @@ if (LLDB_ENABLE_PYTHON)
     "Embed PYTHONHOME in the binary. If set to OFF, PYTHONHOME environment variable will be used to to locate Python."
     ${default_embed_python_home})
 
+  if (SWIG_VERSION VERSION_GREATER_EQUAL "4.2")
+    set(default_enable_python_limited_api ON)
+  else()
+    set(default_enable_python_limited_api OFF)
+  endif()
+  option(LLDB_ENABLE_PYTHON_LIMITED_API "Force LLDB to only use the Python Limited API (requires SWIG 4.2 or later)"
+    ${default_enable_python_limited_api})
+
   include_directories(${Python3_INCLUDE_DIRS})
   if (LLDB_EMBED_PYTHON_HOME)
     get_filename_component(PYTHON_HOME "${Python3_EXECUTABLE}" DIRECTORY)