feat: build using 3.12 RC by default

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

README.md

@@ -41,7 +41,7 @@ What does it do?
 <sup>² Windows arm64 support is experimental.</sup><br>
 <sup>³ Alpine 3.14 and very briefly 3.15's default python3 [was not able to load](https://github.com/pypa/cibuildwheel/issues/934) musllinux wheels. This has been fixed; please upgrade the python package if using Alpine from before the fix.</sup><br>
 <sup>⁴ Cross-compilation not supported with PyPy - to build these wheels you need to run cibuildwheel on an Apple Silicon machine.</sup><br>
-<sup>⁵ CPython 3.12 is available using the [CIBW_PRERELEASE_PYTHONS](https://cibuildwheel.readthedocs.io/en/stable/options/#prerelease-pythons) option.</sup><br>
+<sup>⁵ CPython 3.12 is built by default using Python RCs, starting with cibuildwheel 2.15.</sup><br>
 
 - Builds manylinux, musllinux, macOS 10.9+, and Windows wheels for CPython and PyPy
 - Works on GitHub Actions, Azure Pipelines, Travis CI, AppVeyor, CircleCI, GitLab CI, and Cirrus CI

cibuildwheel/util.py

@@ -250,7 +250,7 @@ class BuildSelector:
     requires_python: SpecifierSet | None = None
 
     # a pattern that skips prerelease versions, when include_prereleases is False.
-    PRERELEASE_SKIP: ClassVar[str] = "cp312-*"
+    PRERELEASE_SKIP: ClassVar[str] = ""
     prerelease_pythons: bool = False
 
     def __call__(self, build_id: str) -> bool:

unit_test/build_selector_test.py

@@ -12,7 +12,7 @@ def test_build():
     assert build_selector("cp37-manylinux_x86_64")
     assert build_selector("cp310-manylinux_x86_64")
     assert build_selector("cp311-manylinux_x86_64")
-    assert not build_selector("cp312-manylinux_x86_64")
+    assert build_selector("cp312-manylinux_x86_64")
     assert build_selector("pp36-manylinux_x86_64")
     assert build_selector("pp37-manylinux_x86_64")
     assert build_selector("cp36-manylinux_i686")
@@ -32,7 +32,7 @@ def test_build():
     assert build_selector("cp37-win_amd64")
     assert build_selector("cp310-win_amd64")
     assert build_selector("cp311-win_amd64")
-    assert not build_selector("cp312-win_amd64")
+    assert build_selector("cp312-win_amd64")
     assert not build_selector("pp36-win_amd64")
     assert not build_selector("pp37-win_amd64")
 

unit_test/linux_build_steps_test.py

@@ -62,8 +62,9 @@ def before_alls(step):
         "cp36-manylinux_x86_64",
         "cp37-manylinux_x86_64",
         "cp311-manylinux_x86_64",
+        "cp312-manylinux_x86_64",
     ]
-    assert before_alls(build_steps[0]) == ["", "", ""]
+    assert before_alls(build_steps[0]) == ["", "", "", ""]
 
     assert build_steps[1].container_image == "other_container_image"
     assert identifiers(build_steps[1]) == ["cp38-manylinux_x86_64", "cp310-manylinux_x86_64"]

unit_test/option_prepare_test.py

@@ -13,7 +13,19 @@
 from cibuildwheel import linux, util
 from cibuildwheel.__main__ import main
 
-ALL_IDS = {"cp36", "cp37", "cp38", "cp39", "cp310", "cp311", "pp37", "pp38", "pp39", "pp310"}
+ALL_IDS = {
+    "cp36",
+    "cp37",
+    "cp38",
+    "cp39",
+    "cp310",
+    "cp311",
+    "cp312",
+    "pp37",
+    "pp38",
+    "pp39",
+    "pp310",
+}
 
 
 @pytest.fixture()
@@ -143,7 +155,7 @@ def test_build_with_override_launches(monkeypatch, tmp_path):
     identifiers = {x.identifier for x in kwargs["platform_configs"]}
     assert identifiers == {
         f"{x}-manylinux_x86_64"
-        for x in ALL_IDS - {"cp36", "cp310", "cp311", "pp37", "pp38", "pp39", "pp310"}
+        for x in ALL_IDS - {"cp36", "cp310", "cp311", "cp312", "pp37", "pp38", "pp39", "pp310"}
     }
     assert kwargs["options"].build_options("cp37-manylinux_x86_64").before_all == ""
 
@@ -153,7 +165,8 @@ def test_build_with_override_launches(monkeypatch, tmp_path):
     assert not kwargs["container"]["simulate_32_bit"]
     identifiers = {x.identifier for x in kwargs["platform_configs"]}
     assert identifiers == {
-        f"{x}-manylinux_x86_64" for x in ["cp310", "cp311", "pp37", "pp38", "pp39", "pp310"]
+        f"{x}-manylinux_x86_64"
+        for x in ["cp310", "cp311", "cp312", "pp37", "pp38", "pp39", "pp310"]
     }
 
     kwargs = build_in_container.call_args_list[3][1]