Pass arguments to pep517 command via MATURIN_PEP517_ARGS env var

[messense]

Do you know if there currently is any way to actually use config_settings? Last time I checked it wasn't usable with pip and the general from the python packaging discourse consensus was that it's effectively unspecified so we're not doing anything with it.

Yes, this is what I've found out too from further reading. It sounds like config_settings doesn't work, so in general we currently don't have a way to pass options to maturin during PEP 517 build. If you don't like having a MATURIN_PROFILE env var an alternative could be a MATURIN_PEP517_ARGS environment variable which adds arguments to the maturin pep517 Rust internal command.

Originally posted by @davidhewitt in #774 (comment)

cc @ionenwks

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