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docs: rust: update instructions for obtaining 'core' source

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The source for Rust's 'core' library is needed to build the kernel with
Rust support. This sometimes needs to be obtained by hand when using a
standalone version of 'rustc' not managed by 'rustup'. Currently, the
documentation suggests cloning the 'rust' repository to obtain these
sources, but this is quite slow (on the order of a multiple minutes).

Change this documentation to suggest using the source tarball instead.
The tarball includes only needed files (<5M) and is significantly faster
to download; this is more in line with what 'rustup' does.

Also simplify wording of the relevant section.

Link: https://github.com/Rust-for-Linux/linux/pull/1024
Signed-off-by: Trevor Gross <tmgross@umich.edu>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20230803060437.12157-2-tmgross@umich.edu
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Trevor Gross 2023-08-03 02:04:36 -04:00 committed by Miguel Ojeda
parent b603c6cc40
commit 8cb40124cf
1 changed files with 8 additions and 7 deletions
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15
Documentation/rust/quick-start.rst
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@ -56,16 +56,17 @@ If ``rustup`` is being used, run::
The components are installed per toolchain, thus upgrading the Rust compiler
version later on requires re-adding the component.
Otherwise, if a standalone installer is used, the Rust repository may be cloned
into the installation folder of the toolchain::
Otherwise, if a standalone installer is used, the Rust source tree may be
downloaded into the toolchain's installation folder::
git clone --recurse-submodules \
--branch $(scripts/min-tool-version.sh rustc) \
https://github.com/rust-lang/rust \
$(rustc --print sysroot)/lib/rustlib/src/rust
curl -L "https://static.rust-lang.org/dist/rust-src-$(scripts/min-tool-version.sh rustc).tar.gz" |
tar -xzf - -C "$(rustc --print sysroot)/lib" \
"rust-src-$(scripts/min-tool-version.sh rustc)/rust-src/lib/" \
--strip-components=3
In this case, upgrading the Rust compiler version later on requires manually
updating this clone.
updating the source tree (this can be done by removing ``$(rustc --print
sysroot)/lib/rustlib/src/rust`` then rerunning the above command).
libclang