From 4d6fb873abac5fe4a8a14b0ec724ea6918fa5bfd Mon Sep 17 00:00:00 2001
From: Paolo Tranquilli <redsun82@github.com>
Date: Thu, 5 Feb 2026 17:35:02 +0100
Subject: [PATCH] feat: add Python 3.12 toolchain registration

rules_python 1.x requires explicit toolchain setup and no longer
auto-registers toolchains. Register Python 3.12 toolchain to ensure
Python tools work correctly with Bazel 9.
---
 MODULE.bazel | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/MODULE.bazel b/MODULE.bazel
index aa58685a070..aaa0ea0f7d6 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -190,6 +190,15 @@ pip.parse(
 )
 use_repo(pip, "codegen_deps")
 
+python = use_extension("@rules_python//python/extensions:python.bzl", "python")
+python.toolchain(
+    is_default = True,
+    python_version = "3.12",
+)
+use_repo(python, "python_3_12", "python_versions")
+
+register_toolchains("@python_versions//3.12:all")
+
 swift_deps = use_extension("//swift/third_party:load.bzl", "swift_deps")
 
 # following list can be kept in sync with `bazel mod tidy`