Build Python 3.14 free-threaded wheels.

.github/workflows/ci.yml

@@ -56,6 +56,8 @@ jobs:
           - cp311-cp311
           - cp312-cp312
           - cp313-cp313
+          - cp314-cp314
+          - cp314-cp314t
     permissions:
       id-token: write # This is required for requesting the JWT
     steps:
@@ -81,6 +83,8 @@ jobs:
           - cp311-cp311
           - cp312-cp312
           - cp313-cp313
+          - cp314-cp314
+          - cp314-cp314t
     permissions:
       id-token: write # This is required for requesting the JWT
     steps:
@@ -108,6 +112,8 @@ jobs:
           - cp311-cp311
           - cp312-cp312
           - cp313-cp313
+          - cp314-cp314
+          - cp314-cp314t
     permissions:
       id-token: write # This is required for requesting the JWT
     steps:
@@ -133,6 +139,8 @@ jobs:
           - cp311-cp311
           - cp312-cp312
           - cp313-cp313
+          - cp314-cp314
+          - cp314-cp314t
     permissions:
       id-token: write # This is required for requesting the JWT
     steps:

setup.py

@@ -25,6 +25,9 @@
 # sysconfig.get_config_var('MACOSX_DEPLOYMENT_TARGET').
 MACOS_DEPLOYMENT_TARGET_MIN = "10.15"
 
+# True if this is a free-threaded Python build.
+FREE_THREADED_BUILD = sysconfig.get_config_var("Py_GIL_DISABLED")
+
 # This is the minimum version of the Windows SDK needed for schannel.h with SCH_CREDENTIALS and
 # TLS_PARAMETERS. These are required to build Windows Binaries with TLS 1.3 support.
 WINDOWS_SDK_VERSION_TLS1_3_SUPPORT = "10.0.17763.0"
@@ -428,7 +431,10 @@ class bdist_wheel_abi3(bdist_wheel):
     def get_tag(self):
         python, abi, plat = super().get_tag()
         # on CPython, our wheels are abi3 and compatible back to 3.11
-        if python.startswith("cp") and sys.version_info >= (3, 13):
+        # but free-threaded builds don't use limited API, so skip abi3 tag
+        if FREE_THREADED_BUILD:
+            return python, abi, plat
+        elif python.startswith("cp") and sys.version_info >= (3, 13):
             # 3.13 deprecates PyWeakref_GetObject(), adds alternative
             return "cp313", "abi3", plat
         elif python.startswith("cp") and sys.version_info >= (3, 11):
@@ -532,7 +538,11 @@ def awscrt_ext():
                     extra_link_args += ['-Wl,--fatal-warnings']
 
     # prefer building with stable ABI, so a wheel can work with multiple major versions
-    if sys.version_info >= (3, 13):
+    if FREE_THREADED_BUILD and sys.version_info[:2] == (3, 14):
+        # 3.14 free threaded (aka no gil) does not support limited api.
+        # disable it for now. 3.15 promises to support limited api + free threading combo
+        py_limited_api = False
+    elif sys.version_info >= (3, 13):
         # 3.13 deprecates PyWeakref_GetObject(), adds alternative
         define_macros.append(('Py_LIMITED_API', '0x030D0000'))
         py_limited_api = True

source/module.c

@@ -1013,6 +1013,10 @@ PyMODINIT_FUNC PyInit__awscrt(void) {
         return NULL;
     }
 
+#ifdef Py_GIL_DISABLED
+    PyUnstable_Module_SetGIL(m, Py_MOD_GIL_NOT_USED);
+#endif
+
     s_init_allocator();
 
     /* Don't report this memory when dumping possible leaks. */