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add contributing notes for cross compile test setup

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Dale Wijnand 2018-04-20 19:29:42 +01:00
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CONTRIBUTING.md
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@ -78,7 +78,10 @@ in `test/` provide templates on how to test Cargo's behavior in a
sandbox-environment. The internal crate `cargotest` provides a vast amount
of helpers to minimize boilerplate.
* Make sure `cargo test` passes. If you do not have the cross-compilers
installed locally, ignore the cross-compile test failures or disable them by
installed locally, install them using the instructions returned by
`cargo test cross_compile::cross_tests` (twice, with `--toolchain nightly`
added to get the nightly cross target too); alternatively just
ignore the cross-compile test failures or disable them by
using `CFG_DISABLE_CROSS_TESTS=1 cargo test`. Note that some tests are enabled
only on `nightly` toolchain. If you can, test both toolchains.
* All code changes are expected to comply with the formatting suggested by `rustfmt`.