Disable the JIT on free-threaded builds

Author: zanieb

cpython-unix/build-cpython.sh

@@ -466,7 +466,8 @@ if [ -n "${CPYTHON_OPTIMIZED}" ]; then
 
         # Do not enable on x86-64 macOS because the JIT requires macOS 11+ and we are currently
         # using 10.15 as a miniumum version.
-        if [ "${TARGET_TRIPLE}" != "x86_64-apple-darwin" ]; then
+        # Do not enable when free-threading, because they're not compatible yet.
+        if [[ ! "${TARGET_TRIPLE}" == "x86_64-apple-darwin" || -n "${CPYTHON_FREETHREADED}" ]]; then
             CONFIGURE_FLAGS="${CONFIGURE_FLAGS} --enable-experimental-jit=yes-off"
         fi