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fix: don't error when a global build-frontend is set on pyodide (#2945)

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Since #2609, the pyodide platform required the 'pyodide-build' frontend,
but a global build-frontend setting (TOML or CIBW_BUILD_FRONTEND)
overrides the platform default, so previously-working configs like
build-frontend = "build" failed with a ConfigurationError. Even
"default" failed, since it was mapped to "build" before the check.

Resolve "default" to the platform default, and warn and use
pyodide-build when another frontend is set on pyodide, matching
pre-#2609 behavior where the frontend name only affected verbosity
flags.

Assisted-by: ClaudeCode:claude-opus-4.8
This commit is contained in:
Henry Schreiner
2026-07-23 11:40:11 -04:00
committed by GitHub
parent 1520daf8ae
commit b7cac6dfef
4 changed files with 40 additions and 12 deletions
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docs/platforms.md
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@@ -190,7 +190,7 @@ The `--libdir` option specifies the directory containing cross-compiled shared l
### Build frontend support {: #pyodide-build-frontend}
The pyodide platform builds wheels by shelling out to `pyodide build`, via the `pyodide-build` [`build-frontend`](options.md#build-frontend), which itself is a meta build frontend and passes through commands to pypa/build with specialised handling. This is the only supported frontend for this platform, and is used by default.
The pyodide platform builds wheels by shelling out to `pyodide build`, via the `pyodide-build` [`build-frontend`](options.md#build-frontend), which itself is a meta build frontend and passes through commands to pypa/build with specialised handling. This is the only supported frontend for this platform, and is used by default. A global [`build-frontend`](options.md#build-frontend) setting naming another frontend is ignored with a warning on this platform.
[`build-verbosity`](options.md#build-verbosity) is passed through to `pyodide build` as `-v`/`-vv`. It is capped at `-vv`. `pyodide build` has no `-vvv` flag.