feat: option to build directly with uv

bin/generate_schema.py

@@ -58,21 +58,23 @@
     type: string_array
   build-frontend:
     default: default
-    description: Set the tool to use to build, either "build" (default), "build[uv]", or "pip"
+    description: Set the tool to use to build, either "build" (default), "build[uv]", "uv", or "pip"
     oneOf:
-      - enum: [pip, build, "build[uv]", default]
+      - enum: [pip, build, "build[uv]", uv, default]
       - type: string
         pattern: '^pip; ?args:'
       - type: string
         pattern: '^build; ?args:'
       - type: string
         pattern: '^build\\[uv\\]; ?args:'
+      - type: string
+        pattern: '^uv; ?args:'
       - type: object
         additionalProperties: false
         required: [name]
         properties:
           name:
-            enum: [pip, build, "build[uv]"]
+            enum: [pip, build, "build[uv]", uv]
           args:
             type: array
             items:

cibuildwheel/frontend.py

@@ -7,7 +7,7 @@
 from .logger import log
 from .util.helpers import parse_key_value_string
 
-BuildFrontendName = Literal["pip", "build", "build[uv]"]
+BuildFrontendName = Literal["pip", "build", "build[uv]", "uv"]
 
 
 @dataclasses.dataclass(frozen=True)

cibuildwheel/platforms/ios.py

@@ -282,7 +282,7 @@ def setup_python(
     build_frontend: BuildFrontendName,
     xbuild_tools: Sequence[str] | None,
 ) -> tuple[Path, dict[str, str]]:
-    if build_frontend == "build[uv]":
+    if build_frontend == "build[uv]" or build_frontend == "uv":
         msg = "uv doesn't support iOS"
         raise errors.FatalError(msg)
 
@@ -439,7 +439,7 @@ def build(options: Options, tmp_path: Path) -> None:
             build_options = options.build_options(config.identifier)
             build_frontend = build_options.build_frontend
             # uv doesn't support iOS
-            if build_frontend.name == "build[uv]":
+            if build_frontend.name == "build[uv]" or build_frontend.name == "uv":
                 msg = "uv doesn't support iOS"
                 raise errors.FatalError(msg)
 

cibuildwheel/platforms/linux.py

@@ -205,7 +205,7 @@ def build_in_container(
         local_identifier_tmp_dir = local_tmp_dir / config.identifier
         build_options = options.build_options(config.identifier)
         build_frontend = build_options.build_frontend
-        use_uv = build_frontend.name == "build[uv]"
+        use_uv = build_frontend.name in {"build[uv]", "uv"}
         pip = ["uv", "pip"] if use_uv else ["pip"]
 
         log.step("Setting up build environment...")
@@ -305,6 +305,19 @@ def build_in_container(
                         ],
                         env=env,
                     )
+                case "uv":
+                    container.call(
+                        [
+                            "uv",
+                            "build",
+                            "--python=python",
+                            container_package_dir,
+                            "--wheel",
+                            f"--out-dir={built_wheel_dir}",
+                            *extra_flags,
+                        ],
+                        env=env,
+                    )
                 case _:
                     assert_never(build_frontend)
 

cibuildwheel/platforms/macos.py

@@ -217,7 +217,7 @@ def setup_python(
     build_frontend: BuildFrontendName,
 ) -> tuple[Path, dict[str, str]]:
     uv_path = find_uv()
-    use_uv = build_frontend == "build[uv]"
+    use_uv = build_frontend in {"build[uv]", "uv"}
 
     tmp.mkdir()
     implementation_id = python_configuration.identifier.split("-")[0]
@@ -377,6 +377,17 @@ def setup_python(
                 *constraint_flags(dependency_constraint),
                 env=env,
             )
+        case "uv":
+            assert uv_path is not None
+            call(
+                uv_path,
+                "pip",
+                "install",
+                "--upgrade",
+                "delocate",
+                *constraint_flags(dependency_constraint),
+                env=env,
+            )
         case _:
             assert_never(build_frontend)
 
@@ -409,7 +420,7 @@ def build(options: Options, tmp_path: Path) -> None:
         for config in python_configurations:
             build_options = options.build_options(config.identifier)
             build_frontend = build_options.build_frontend
-            use_uv = build_frontend.name == "build[uv]"
+            use_uv = build_frontend.name in {"build[uv]", "uv"}
             uv_path = find_uv()
             if use_uv and uv_path is None:
                 msg = "uv not found"
@@ -500,6 +511,17 @@ def build(options: Options, tmp_path: Path) -> None:
                             *extra_flags,
                             env=build_env,
                         )
+                    case "uv":
+                        call(
+                            "uv",
+                            "build",
+                            "--python=python",
+                            build_options.package_dir,
+                            "--wheel",
+                            f"--out-dir={built_wheel_dir}",
+                            *extra_flags,
+                            env=build_env,
+                        )
                     case _:
                         assert_never(build_frontend)
 

cibuildwheel/platforms/windows.py

@@ -261,10 +261,10 @@ def setup_python(
         raise ValueError(msg)
     assert base_python.exists()
 
-    if build_frontend == "build[uv]" and not can_use_uv(python_configuration):
+    if build_frontend in {"build[uv]", "uv"} and not can_use_uv(python_configuration):
         build_frontend = "build"
 
-    use_uv = build_frontend == "build[uv]"
+    use_uv = build_frontend in {"build[uv]", "uv"}
     uv_path = find_uv()
 
     log.step("Setting up build environment...")
@@ -396,8 +396,7 @@ def build(options: Options, tmp_path: Path) -> None:
         for config in python_configurations:
             build_options = options.build_options(config.identifier)
             build_frontend = build_options.build_frontend
-
-            use_uv = build_frontend.name == "build[uv]" and can_use_uv(config)
+            use_uv = build_frontend.name in {"build[uv]", "uv"} and can_use_uv(config)
             log.build_start(config.identifier)
 
             identifier_tmp_dir = tmp_path / config.identifier
@@ -501,6 +500,17 @@ def build(options: Options, tmp_path: Path) -> None:
                             *extra_flags,
                             env=build_env,
                         )
+                    case "uv":
+                        call(
+                            "uv",
+                            "build",
+                            "--python=python",
+                            build_options.package_dir,
+                            "--wheel",
+                            f"--out-dir={built_wheel_dir}",
+                            *extra_flags,
+                            env=build_env,
+                        )
                     case _:
                         assert_never(build_frontend)
 

cibuildwheel/util/packaging.py

@@ -202,6 +202,6 @@ def combine_constraints(
 
     user_constraints = env.get("PIP_CONSTRAINT")
 
-    env["UV_CONSTRAINT"] = env["PIP_CONSTRAINT"] = " ".join(
+    env["UV_BUILD_CONSTRAINT"] = env["UV_CONSTRAINT"] = env["PIP_CONSTRAINT"] = " ".join(
         c for c in [our_constraints, user_constraints] if c
     )

test/conftest.py

@@ -151,11 +151,13 @@ def docker_warmup_fixture(
     return None
 
 
-@pytest.fixture(params=["pip", "build"])
+@pytest.fixture(params=["pip", "build", "uv"])
 def build_frontend_env_nouv(request: pytest.FixtureRequest) -> dict[str, str]:
     frontend = request.param
-    if get_platform() == "pyodide" and frontend == "pip":
-        pytest.skip("Can't use pip as build frontend for pyodide platform")
+    if get_platform() == "pyodide" and frontend in {"pip", "uv"}:
+        pytest.skip("Can't use pip or uv as build frontend for pyodide platform")
+    if frontend == "uv" and find_uv() is None:
+        pytest.skip("Can't find uv")
 
     return {"CIBW_BUILD_FRONTEND": frontend}
 

test/test_troubleshooting.py

@@ -7,11 +7,18 @@
 
 SO_FILE_WARNING = "NOTE: Shared object (.so) files found in this project."
 
+PYPROJECT_TOML = """
+[build-system]
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta:__legacy__"
+"""
+
 
 @pytest.mark.parametrize("project_contains_so_files", [False, True])
 def test_failed_build_with_so_files(tmp_path, capfd, build_frontend_env, project_contains_so_files):
     project = TestProject()
     project.files["setup.py"] = "raise Exception('this build will fail')\n"
+    project.files["pyproject.toml"] = PYPROJECT_TOML
     if project_contains_so_files:
         project.files["libnothing.so"] = ""
 

unit_test/options_test.py

@@ -327,6 +327,11 @@ def test_environment_pass_references():
             "build",
             [],
         ),
+        (
+            'build-frontend = "uv"',
+            "uv",
+            [],
+        ),
         (
             'build-frontend = {name = "build"}',
             "build",