Alexis Beingessner a2e4c21db2 Bug 1677593 - Add support for building rust from source. r=glandium ... This adds a linux64-rust-dev toolchain and a git fetch of rust-lang/rust that it can source from (stable tag for 1.47). There are some issues with cross-compiling, so for now the toolchain only builds a host build, although a lot of the machinery for cross compiling is there for anyone brave/desperate enough to get it working. Also note some changes were made to Rust's config.toml between 1.47 and 1.50, so some version detection may need to be added in the future. There is experimental support for providing patches via a new --patch flag. Additionally, I documented the existence of the "bors-" mode. Differential Revision: https://phabricator.services.mozilla.com/D97497		2020-11-26 00:42:27 +00:00
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