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Add a comment why rustdoc loads crates from the sysroot

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Joshua Nelson 2020-09-15 08:40:10 -04:00
parent f7f9a6c135
commit b93a8315f2
1 changed files with 5 additions and 1 deletions
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6
src/librustdoc/lib.rs
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@ -21,7 +21,11 @@ extern crate tracing;
// N.B. these need `extern crate` even in 2018 edition
// because they're loaded implicitly from the sysroot.
// Dependencies listed in Cargo.toml do not need extern crate.
// The reason they're loaded from the sysroot is because
// the rustdoc artifacts aren't stored in rustc's cargo target directory.
// So if `rustc` was specified in Cargo.toml, this would spuriously rebuild crates.
//
// Dependencies listed in Cargo.toml do not need `extern crate`.
extern crate rustc_ast;
extern crate rustc_ast_pretty;
extern crate rustc_attr;