setup.py: install correctly if CARGO_ env vars set #390
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On PyO3/pyo3#1269 I currently have an issue where
CARGO_BUILD_TARGET
environment variable causespip install maturin
to fail because thematurin
executable is put in an unexpected location.This PR changes setup.py to use the
--message-format=json
output from rustc to snoop the builtmaturin
binary location for installation.