Add pyodide-build as a separate build frontend and update its build verbosity handling (#2609)

test/conftest.py

@@ -157,8 +157,8 @@ def build_frontend_env_nouv(request: pytest.FixtureRequest) -> dict[str, str]:
     marks = {m.name for m in request.node.iter_markers()}
 
     platform = "pyodide" if "pyodide" in marks else get_platform()
-    if platform == "pyodide" and frontend == "pip":
-        pytest.skip("Can't use pip as build frontend for pyodide platform")
+    if platform == "pyodide":
+        pytest.skip("pyodide only supports the pyodide-build frontend")
 
     return {"CIBW_BUILD_FRONTEND": frontend}
 
@@ -176,10 +176,10 @@ def build_frontend_env(request: pytest.FixtureRequest) -> Generator[dict[str, st
     else:
         platform = get_platform()
 
-    if platform in {"pyodide", "ios", "android"} and frontend == "pip":
+    if platform == "pyodide":
+        pytest.skip("pyodide only supports the pyodide-build frontend")
+    if platform in {"ios", "android"} and frontend == "pip":
         pytest.skip(f"Can't use pip as build frontend for {platform}")
-    if platform == "pyodide" and frontend in {"build[uv]", "uv"}:
-        pytest.skip("Can't use uv with pyodide yet")
     uv_path = find_uv()
     if uv_path is None and frontend in {"build[uv]", "uv"}:
         pytest.skip("Can't find uv, so skipping uv tests")

test/test_before_build.py

@@ -50,7 +50,7 @@ def test(tmp_path: Path) -> None:
         """python -c "import pathlib, sys; pathlib.Path('{project}/pythonversion_bb.txt').write_text(sys.version)" && """
         f'''python -c "import pathlib, sys; pathlib.Path('{{project}}/pythonprefix_bb.txt').write_text({SYS_PREFIX})"'''
     )
-    frontend = "build"
+    frontend = "pyodide-build" if utils.get_platform() == "pyodide" else "build"
     if utils.get_platform() != "pyodide":
         before_build = f"python -m pip install setuptools && {before_build}"
         frontend = f"{frontend};args: --no-isolation"

test/test_build_frontend_args.py

@@ -15,7 +15,17 @@ if TYPE_CHECKING:
     "frontend_name",
     [
         pytest.param("pip", marks=utils.skip_if_pyodide("No pip for pyodide")),
-        "build",
+        pytest.param(
+            "build",
+            marks=utils.skip_if_pyodide("pyodide only supports the pyodide-build frontend"),
+        ),
+        pytest.param(
+            "pyodide-build",
+            marks=pytest.mark.skipif(
+                utils.get_platform() != "pyodide",
+                reason="pyodide-build frontend is only valid on pyodide",
+            ),
+        ),
     ],
 )
 def test_build_frontend_args(
@@ -27,7 +37,7 @@ def test_build_frontend_args(
 
     # the build will fail because the frontend is called with '-h' - it prints the help message
     add_env = {"CIBW_BUILD_FRONTEND": f"{frontend_name}; args: -h"}
-    if utils.get_platform() == "pyodide":
+    if frontend_name == "pyodide-build":
         add_env["TERM"] = "dumb"  # disable color / style
         add_env["NO_COLOR"] = "1"
     with pytest.raises(subprocess.CalledProcessError):
@@ -40,7 +50,7 @@ def test_build_frontend_args(
     if frontend_name == "pip":
         assert "Usage:" in captured.out
         assert "Wheel Options:" in captured.out
-    elif utils.get_platform() == "pyodide":
+    elif frontend_name == "pyodide-build":
         assert "Usage: pyodide build" in captured.out
     else:
         assert "usage:" in captured.out