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Add a new `USE_EXPAND` variable called `RUST_SYSROOTS` which allows to
specify additional Rust sysroots to build. Rust sysroot is a directory
which contains the prebuilt standard libraries (in form of `*.rlib`
files) and utility binaries (e.g. `rust-objcopy`).
This variable is limited to bare metal targets. Sysroot for targets not
falling into that category contain a local copy of compiler runtime,
libc and unwinder, so crossdev is a better fit for them.
In this change, the only `RUST_SYSROOT` option is `wasm`, which enables
build of a sysroot for `wasm32-unknown-unknown` target and replaces the
former `wasm` USE flag.
Signed-off-by: Michal Rostecki <[email protected]>
Signed-off-by: Matt Jolly <[email protected]>
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Michal Rostecki
Matt Jolly
GitWeb