From d82d5c2ddbc73fc188812a3d16b9ab2d15c76a01 Mon Sep 17 00:00:00 2001
From: Savannah Ostrowski <savannah@python.org>
Date: Sun, 3 May 2026 17:29:26 -0700
Subject: [PATCH] [3.13] GH-146475: Block Apple Clang for building JIT stencils
 (#149188) (#149340)

GH-146475: Block Apple Clang for building JIT stencils (#149188)

(cherry picked from commit c0e064003954142b4ba820dfe149f893227c4f11)
---
 .../next/Build/2026-04-30-08-43-47.gh-issue-146475.1cL4hX.rst | 2 ++
 Tools/jit/_llvm.py                                            | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Build/2026-04-30-08-43-47.gh-issue-146475.1cL4hX.rst

diff --git a/Misc/NEWS.d/next/Build/2026-04-30-08-43-47.gh-issue-146475.1cL4hX.rst b/Misc/NEWS.d/next/Build/2026-04-30-08-43-47.gh-issue-146475.1cL4hX.rst
new file mode 100644
index 00000000000..225c659393f
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2026-04-30-08-43-47.gh-issue-146475.1cL4hX.rst
@@ -0,0 +1,2 @@
+Block Apple Clang from being used to build the JIT as it ships without
+required LLVM tools.
diff --git a/Tools/jit/_llvm.py b/Tools/jit/_llvm.py
index 606f280a14d..b68da1b6be1 100644
--- a/Tools/jit/_llvm.py
+++ b/Tools/jit/_llvm.py
@@ -9,7 +9,9 @@ import subprocess
 import typing
 
 _LLVM_VERSION = 18
-_LLVM_VERSION_PATTERN = re.compile(rf"version\s+{_LLVM_VERSION}\.\d+\.\d+\S*\s+")
+_LLVM_VERSION_PATTERN = re.compile(
+    rf"(?<!Apple )(LLVM|clang) version\s+{_LLVM_VERSION}\.\d+\.\d+\S*\s+"
+)
 
 _P = typing.ParamSpec("_P")
 _R = typing.TypeVar("_R")