From 85af95adce28e29ecc9c1bc9d90874f60a899167 Mon Sep 17 00:00:00 2001
From: Zanie Blue <contact@zanie.dev>
Date: Mon, 24 Feb 2025 20:15:33 -0600
Subject: [PATCH 1/3] Set `enable-experimental-jit=yes-off` on Python 3.13+

---
 cpython-unix/build-cpython.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/cpython-unix/build-cpython.sh b/cpython-unix/build-cpython.sh
index 566700e0..64d5a847 100755
--- a/cpython-unix/build-cpython.sh
+++ b/cpython-unix/build-cpython.sh
@@ -424,6 +424,11 @@ if [ -n "${CPYTHON_OPTIMIZED}" ]; then
     if [[ -n "${PYTHON_MEETS_MINIMUM_VERSION_3_12}" && -n "${BOLT_CAPABLE}" ]]; then
         CONFIGURE_FLAGS="${CONFIGURE_FLAGS} --enable-bolt"
     fi
+
+    # Allow users to enable the experimental JIT on 3.13+
+    if [[ -n "${PYTHON_MEETS_MINIMUM_VERSION_3_13}" ]]; then
+        CONFIGURE_FLAGS="${CONFIGURE_FLAGS} --enable-experimental-jit=yes-off"
+    fi
 fi
 
 if [ -n "${CPYTHON_LTO}" ]; then

From 5664603c82b96c57417a6bfc8543710a848b2458 Mon Sep 17 00:00:00 2001
From: Zanie Blue <contact@zanie.dev>
Date: Wed, 26 Feb 2025 13:04:55 -0600
Subject: [PATCH 2/3] Bump to LLVM 19 on 3.13

---
 cpython-unix/build-cpython.sh        |  6 ++++++
 cpython-unix/patch-jit-llvm-19.patch | 12 ++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 cpython-unix/patch-jit-llvm-19.patch

diff --git a/cpython-unix/build-cpython.sh b/cpython-unix/build-cpython.sh
index 64d5a847..9fae23e9 100755
--- a/cpython-unix/build-cpython.sh
+++ b/cpython-unix/build-cpython.sh
@@ -428,6 +428,12 @@ if [ -n "${CPYTHON_OPTIMIZED}" ]; then
     # Allow users to enable the experimental JIT on 3.13+
     if [[ -n "${PYTHON_MEETS_MINIMUM_VERSION_3_13}" ]]; then
         CONFIGURE_FLAGS="${CONFIGURE_FLAGS} --enable-experimental-jit=yes-off"
+
+        if [[ -n "${PYTHON_MEETS_MAXIMUM_VERSION_3_13}" ]]; then
+            # On 3.13, LLVM 18 is hard-coded into the configure script. Override it to our toolchain
+            # version.
+            patch -p1 -i "${ROOT}/patch-jit-llvm-19.patch"
+        fi
     fi
 fi
 
diff --git a/cpython-unix/patch-jit-llvm-19.patch b/cpython-unix/patch-jit-llvm-19.patch
new file mode 100644
index 00000000..1b66f119
--- /dev/null
+++ b/cpython-unix/patch-jit-llvm-19.patch
@@ -0,0 +1,12 @@
+diff --git a/Tools/jit/_llvm.py b/Tools/jit/_llvm.py
+--- a/Tools/jit/_llvm.py
++++ b/Tools/jit/_llvm.py
+@@ -8,7 +8,7 @@
+ import subprocess
+ import typing
+ 
+-_LLVM_VERSION = 18
++_LLVM_VERSION = 19
+ _LLVM_VERSION_PATTERN = re.compile(rf"version\s+{_LLVM_VERSION}\.\d+\.\d+\S*\s+")
+ 
+ _P = typing.ParamSpec("_P")

From 28c8fd9afe7819f67f59fe599fa7196db881631b Mon Sep 17 00:00:00 2001
From: Zanie Blue <contact@zanie.dev>
Date: Wed, 26 Feb 2025 16:31:19 -0600
Subject: [PATCH 3/3] Limit to 3.13 / Linux

---
 cpython-unix/build-cpython.sh | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/cpython-unix/build-cpython.sh b/cpython-unix/build-cpython.sh
index 9fae23e9..0bba0168 100755
--- a/cpython-unix/build-cpython.sh
+++ b/cpython-unix/build-cpython.sh
@@ -427,7 +427,12 @@ if [ -n "${CPYTHON_OPTIMIZED}" ]; then
 
     # Allow users to enable the experimental JIT on 3.13+
     if [[ -n "${PYTHON_MEETS_MINIMUM_VERSION_3_13}" ]]; then
-        CONFIGURE_FLAGS="${CONFIGURE_FLAGS} --enable-experimental-jit=yes-off"
+
+        # The JIT build is failing on macOS and 3.14+ due to compiler errors
+        # Only enable on Linux / 3.13 until that's fixed upstream
+        if [[ -n "${PYTHON_MEETS_MAXIMUM_VERSION_3_13}" && "${PYBUILD_PLATFORM}" != "macos" ]]; then
+            CONFIGURE_FLAGS="${CONFIGURE_FLAGS} --enable-experimental-jit=yes-off"
+        fi
 
         if [[ -n "${PYTHON_MEETS_MAXIMUM_VERSION_3_13}" ]]; then
             # On 3.13, LLVM 18 is hard-coded into the configure script. Override it to our toolchain