1 //! Documentation generation for rustbuilder.
3 //! This module implements generation for all bits and pieces of documentation
4 //! for the Rust project. This notably includes suites like the rust book, the
5 //! nomicon, rust by example, standalone documentation, etc.
7 //! Everything here is basically just a shim around calling either `rustbook` or
10 use std::collections::HashSet;
13 use std::path::{Path, PathBuf};
16 use build_helper::{t, up_to_date};
18 use crate::builder::{Builder, Compiler, RunConfig, ShouldRun, Step};
19 use crate::cache::{Interned, INTERNER};
21 use crate::config::{Config, TargetSelection};
22 use crate::tool::{self, prepare_tool_cargo, SourceType, Tool};
23 use crate::util::symlink_dir;
26 ($($name:ident, $path:expr, $book_name:expr;)+) => {
28 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
30 target: TargetSelection,
35 const DEFAULT: bool = true;
37 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
38 let builder = run.builder;
39 run.path($path).default_condition(builder.config.docs)
42 fn make_run(run: RunConfig<'_>) {
43 run.builder.ensure($name {
48 fn run(self, builder: &Builder<'_>) {
49 builder.ensure(RustbookSrc {
51 name: INTERNER.intern_str($book_name),
52 src: INTERNER.intern_path(builder.src.join($path)),
60 // NOTE: When adding a book here, make sure to ALSO build the book by
61 // adding a build step in `src/bootstrap/builder.rs`!
63 CargoBook, "src/tools/cargo/src/doc", "cargo";
64 EditionGuide, "src/doc/edition-guide", "edition-guide";
65 EmbeddedBook, "src/doc/embedded-book", "embedded-book";
66 Nomicon, "src/doc/nomicon", "nomicon";
67 Reference, "src/doc/reference", "reference";
68 RustByExample, "src/doc/rust-by-example", "rust-by-example";
69 RustdocBook, "src/doc/rustdoc", "rustdoc";
72 fn open(builder: &Builder<'_>, path: impl AsRef<Path>) {
73 if builder.config.dry_run || !builder.config.cmd.open() {
77 let path = path.as_ref();
78 builder.info(&format!("Opening doc {}", path.display()));
79 if let Err(err) = opener::open(path) {
80 builder.info(&format!("{}\n", err));
84 // "library/std" -> ["library", "std"]
86 // Used for deciding whether a particular step is one requested by the user on
87 // the `x.py doc` command line, which determines whether `--open` will open that
89 fn components_simplified(path: &PathBuf) -> Vec<&str> {
90 path.iter().map(|component| component.to_str().unwrap_or("???")).collect()
93 fn is_explicit_request(builder: &Builder<'_>, path: &str) -> bool {
97 .map(components_simplified)
98 .any(|requested| requested.iter().copied().eq(path.split('/')))
101 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
102 pub struct UnstableBook {
103 target: TargetSelection,
106 impl Step for UnstableBook {
108 const DEFAULT: bool = true;
110 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
111 let builder = run.builder;
112 run.path("src/doc/unstable-book").default_condition(builder.config.docs)
115 fn make_run(run: RunConfig<'_>) {
116 run.builder.ensure(UnstableBook { target: run.target });
119 fn run(self, builder: &Builder<'_>) {
120 builder.ensure(UnstableBookGen { target: self.target });
121 builder.ensure(RustbookSrc {
123 name: INTERNER.intern_str("unstable-book"),
124 src: INTERNER.intern_path(builder.md_doc_out(self.target).join("unstable-book")),
129 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
131 target: TargetSelection,
132 name: Interned<String>,
133 src: Interned<PathBuf>,
136 impl Step for RustbookSrc {
139 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
143 /// Invoke `rustbook` for `target` for the doc book `name` from the `src` path.
145 /// This will not actually generate any documentation if the documentation has
146 /// already been generated.
147 fn run(self, builder: &Builder<'_>) {
148 let target = self.target;
149 let name = self.name;
151 let out = builder.doc_out(target);
152 t!(fs::create_dir_all(&out));
154 let out = out.join(name);
155 let index = out.join("index.html");
156 let rustbook = builder.tool_exe(Tool::Rustbook);
157 let mut rustbook_cmd = builder.tool_cmd(Tool::Rustbook);
158 if builder.config.dry_run || up_to_date(&src, &index) && up_to_date(&rustbook, &index) {
161 builder.info(&format!("Rustbook ({}) - {}", target, name));
162 let _ = fs::remove_dir_all(&out);
164 builder.run(rustbook_cmd.arg("build").arg(&src).arg("-d").arg(out));
168 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
171 target: TargetSelection,
174 impl Step for TheBook {
176 const DEFAULT: bool = true;
178 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
179 let builder = run.builder;
180 run.path("src/doc/book").default_condition(builder.config.docs)
183 fn make_run(run: RunConfig<'_>) {
184 run.builder.ensure(TheBook {
185 compiler: run.builder.compiler(run.builder.top_stage, run.builder.config.build),
190 /// Builds the book and associated stuff.
192 /// We need to build:
195 /// * Older edition redirects
196 /// * Version info and CSS
199 fn run(self, builder: &Builder<'_>) {
200 let compiler = self.compiler;
201 let target = self.target;
204 builder.ensure(RustbookSrc {
206 name: INTERNER.intern_str("book"),
207 src: INTERNER.intern_path(builder.src.join("src/doc/book")),
210 // building older edition redirects
211 for edition in &["first-edition", "second-edition", "2018-edition"] {
212 builder.ensure(RustbookSrc {
214 name: INTERNER.intern_string(format!("book/{}", edition)),
215 src: INTERNER.intern_path(builder.src.join("src/doc/book").join(edition)),
219 // build the version info page and CSS
220 builder.ensure(Standalone { compiler, target });
222 // build the redirect pages
223 builder.info(&format!("Documenting book redirect pages ({})", target));
224 for file in t!(fs::read_dir(builder.src.join("src/doc/book/redirects"))) {
226 let path = file.path();
227 let path = path.to_str().unwrap();
229 invoke_rustdoc(builder, compiler, target, path);
232 if is_explicit_request(builder, "src/doc/book") {
233 let out = builder.doc_out(target);
234 let index = out.join("book").join("index.html");
235 open(builder, &index);
241 builder: &Builder<'_>,
243 target: TargetSelection,
246 let out = builder.doc_out(target);
248 let path = builder.src.join("src/doc").join(markdown);
250 let header = builder.src.join("src/doc/redirect.inc");
251 let footer = builder.src.join("src/doc/footer.inc");
252 let version_info = out.join("version_info.html");
254 let mut cmd = builder.rustdoc_cmd(compiler);
256 let out = out.join("book");
258 cmd.arg("--html-after-content")
260 .arg("--html-before-content")
262 .arg("--html-in-header")
264 .arg("--markdown-no-toc")
265 .arg("--markdown-playground-url")
266 .arg("https://play.rust-lang.org/")
270 .arg("--markdown-css")
273 if !builder.config.docs_minification {
274 cmd.arg("-Z").arg("unstable-options").arg("--disable-minification");
277 builder.run(&mut cmd);
280 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
281 pub struct Standalone {
283 target: TargetSelection,
286 impl Step for Standalone {
288 const DEFAULT: bool = true;
290 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
291 let builder = run.builder;
292 run.path("src/doc").default_condition(builder.config.docs)
295 fn make_run(run: RunConfig<'_>) {
296 run.builder.ensure(Standalone {
297 compiler: run.builder.compiler(run.builder.top_stage, run.builder.config.build),
302 /// Generates all standalone documentation as compiled by the rustdoc in `stage`
303 /// for the `target` into `out`.
305 /// This will list all of `src/doc` looking for markdown files and appropriately
306 /// perform transformations like substituting `VERSION`, `SHORT_HASH`, and
307 /// `STAMP` along with providing the various header/footer HTML we've customized.
309 /// In the end, this is just a glorified wrapper around rustdoc!
310 fn run(self, builder: &Builder<'_>) {
311 let target = self.target;
312 let compiler = self.compiler;
313 builder.info(&format!("Documenting standalone ({})", target));
314 let out = builder.doc_out(target);
315 t!(fs::create_dir_all(&out));
317 let favicon = builder.src.join("src/doc/favicon.inc");
318 let footer = builder.src.join("src/doc/footer.inc");
319 let full_toc = builder.src.join("src/doc/full-toc.inc");
320 t!(fs::copy(builder.src.join("src/doc/rust.css"), out.join("rust.css")));
322 let version_input = builder.src.join("src/doc/version_info.html.template");
323 let version_info = out.join("version_info.html");
325 if !builder.config.dry_run && !up_to_date(&version_input, &version_info) {
326 let info = t!(fs::read_to_string(&version_input))
327 .replace("VERSION", &builder.rust_release())
328 .replace("SHORT_HASH", builder.rust_info.sha_short().unwrap_or(""))
329 .replace("STAMP", builder.rust_info.sha().unwrap_or(""));
330 t!(fs::write(&version_info, &info));
333 for file in t!(fs::read_dir(builder.src.join("src/doc"))) {
335 let path = file.path();
336 let filename = path.file_name().unwrap().to_str().unwrap();
337 if !filename.ends_with(".md") || filename == "README.md" {
341 let html = out.join(filename).with_extension("html");
342 let rustdoc = builder.rustdoc(compiler);
343 if up_to_date(&path, &html)
344 && up_to_date(&footer, &html)
345 && up_to_date(&favicon, &html)
346 && up_to_date(&full_toc, &html)
347 && (builder.config.dry_run || up_to_date(&version_info, &html))
348 && (builder.config.dry_run || up_to_date(&rustdoc, &html))
353 let mut cmd = builder.rustdoc_cmd(compiler);
354 // Needed for --index-page flag
355 cmd.arg("-Z").arg("unstable-options");
357 cmd.arg("--html-after-content")
359 .arg("--html-before-content")
361 .arg("--html-in-header")
363 .arg("--markdown-no-toc")
365 .arg(&builder.src.join("src/doc/index.md"))
366 .arg("--markdown-playground-url")
367 .arg("https://play.rust-lang.org/")
372 if !builder.config.docs_minification {
373 cmd.arg("--disable-minification");
376 if filename == "not_found.md" {
377 cmd.arg("--markdown-css").arg("https://doc.rust-lang.org/rust.css");
379 cmd.arg("--markdown-css").arg("rust.css");
381 builder.run(&mut cmd);
384 // We open doc/index.html as the default if invoked as `x.py doc --open`
385 // with no particular explicit doc requested (e.g. library/core).
386 if builder.paths.is_empty() || is_explicit_request(builder, "src/doc") {
387 let index = out.join("index.html");
388 open(builder, &index);
393 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
396 pub target: TargetSelection,
401 const DEFAULT: bool = true;
403 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
404 let builder = run.builder;
405 run.all_krates("test").default_condition(builder.config.docs)
408 fn make_run(run: RunConfig<'_>) {
409 run.builder.ensure(Std { stage: run.builder.top_stage, target: run.target });
412 /// Compile all standard library documentation.
414 /// This will generate all documentation for the standard library and its
415 /// dependencies. This is largely just a wrapper around `cargo doc`.
416 fn run(self, builder: &Builder<'_>) {
417 let stage = self.stage;
418 let target = self.target;
419 builder.info(&format!("Documenting stage{} std ({})", stage, target));
420 let out = builder.doc_out(target);
421 t!(fs::create_dir_all(&out));
422 let compiler = builder.compiler(stage, builder.config.build);
424 builder.ensure(compile::Std { compiler, target });
425 let out_dir = builder.stage_out(compiler, Mode::Std).join(target.triple).join("doc");
427 t!(fs::copy(builder.src.join("src/doc/rust.css"), out.join("rust.css")));
429 let run_cargo_rustdoc_for = |package: &str| {
431 builder.cargo(compiler, Mode::Std, SourceType::InTree, target, "rustdoc");
432 compile::std_cargo(builder, target, compiler.stage, &mut cargo);
437 .arg("-Zskip-rustdoc-fingerprint")
439 .arg("--markdown-css")
441 .arg("--markdown-no-toc")
443 .arg("unstable-options")
444 .arg("--resource-suffix")
445 .arg(&builder.version)
447 .arg(&builder.src.join("src/doc/index.md"));
449 if !builder.config.docs_minification {
450 cargo.arg("--disable-minification");
453 builder.run(&mut cargo.into());
459 .map(components_simplified)
461 if path.get(0) == Some(&"library") {
462 Some(path[1].to_owned())
463 } else if !path.is_empty() {
464 Some(path[0].to_owned())
469 .collect::<Vec<_>>();
471 // Only build the following crates. While we could just iterate over the
472 // folder structure, that would also build internal crates that we do
473 // not want to show in documentation. These crates will later be visited
474 // by the rustc step, so internal documentation will show them.
476 // Note that the order here is important! The crates need to be
477 // processed starting from the leaves, otherwise rustdoc will not
478 // create correct links between crates because rustdoc depends on the
479 // existence of the output directories to know if it should be a local
481 let krates = ["core", "alloc", "std", "proc_macro", "test"];
482 for krate in &krates {
483 run_cargo_rustdoc_for(krate);
484 if paths.iter().any(|p| p == krate) {
485 // No need to document more of the libraries if we have the one we want.
489 builder.cp_r(&out_dir, &out);
491 // Look for library/std, library/core etc in the `x.py doc` arguments and
492 // open the corresponding rendered docs.
493 for requested_crate in paths {
494 if krates.iter().any(|k| *k == requested_crate.as_str()) {
495 let index = out.join(requested_crate).join("index.html");
496 open(builder, &index);
502 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
505 target: TargetSelection,
508 impl Step for Rustc {
510 const DEFAULT: bool = true;
511 const ONLY_HOSTS: bool = true;
513 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
514 let builder = run.builder;
515 run.krate("rustc-main").default_condition(builder.config.docs)
518 fn make_run(run: RunConfig<'_>) {
519 run.builder.ensure(Rustc { stage: run.builder.top_stage, target: run.target });
522 /// Generates compiler documentation.
524 /// This will generate all documentation for compiler and dependencies.
525 /// Compiler documentation is distributed separately, so we make sure
526 /// we do not merge it with the other documentation from std, test and
527 /// proc_macros. This is largely just a wrapper around `cargo doc`.
528 fn run(self, builder: &Builder<'_>) {
529 let stage = self.stage;
530 let target = self.target;
531 builder.info(&format!("Documenting stage{} compiler ({})", stage, target));
533 if !builder.config.compiler_docs {
534 builder.info("\tskipping - compiler/librustdoc docs disabled");
538 // This is the intended out directory for compiler documentation.
539 let out = builder.compiler_doc_out(target);
540 t!(fs::create_dir_all(&out));
543 let compiler = builder.compiler(stage, builder.config.build);
544 builder.ensure(compile::Rustc { compiler, target });
546 // This uses a shared directory so that librustdoc documentation gets
547 // correctly built and merged with the rustc documentation. This is
548 // needed because rustdoc is built in a different directory from
549 // rustc. rustdoc needs to be able to see everything, for example when
550 // merging the search index, or generating local (relative) links.
551 let out_dir = builder.stage_out(compiler, Mode::Rustc).join(target.triple).join("doc");
552 t!(symlink_dir_force(&builder.config, &out, &out_dir));
553 // Cargo puts proc macros in `target/doc` even if you pass `--target`
554 // explicitly (https://github.com/rust-lang/cargo/issues/7677).
555 let proc_macro_out_dir = builder.stage_out(compiler, Mode::Rustc).join("doc");
556 t!(symlink_dir_force(&builder.config, &out, &proc_macro_out_dir));
558 // Build cargo command.
559 let mut cargo = builder.cargo(compiler, Mode::Rustc, SourceType::InTree, target, "doc");
560 cargo.rustdocflag("--document-private-items");
561 // Since we always pass --document-private-items, there's no need to warn about linking to private items.
562 cargo.rustdocflag("-Arustdoc::private-intra-doc-links");
563 cargo.rustdocflag("--enable-index-page");
564 cargo.rustdocflag("-Zunstable-options");
565 cargo.rustdocflag("-Znormalize-docs");
566 cargo.rustdocflag("--show-type-layout");
567 compile::rustc_cargo(builder, &mut cargo, target);
568 cargo.arg("-Zskip-rustdoc-fingerprint");
570 // Only include compiler crates, no dependencies of those, such as `libc`.
571 cargo.arg("--no-deps");
573 // Find dependencies for top level crates.
574 let mut compiler_crates = HashSet::new();
575 for root_crate in &["rustc_driver", "rustc_codegen_llvm", "rustc_codegen_ssa"] {
576 compiler_crates.extend(
578 .in_tree_crates(root_crate, Some(target))
580 .map(|krate| krate.name),
584 for krate in &compiler_crates {
585 // Create all crate output directories first to make sure rustdoc uses
587 // FIXME: Cargo should probably do this itself.
588 t!(fs::create_dir_all(out_dir.join(krate)));
589 cargo.arg("-p").arg(krate);
592 builder.run(&mut cargo.into());
596 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
599 target: TargetSelection,
602 impl Step for Rustdoc {
604 const DEFAULT: bool = true;
605 const ONLY_HOSTS: bool = true;
607 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
608 run.krate("rustdoc-tool")
611 fn make_run(run: RunConfig<'_>) {
612 run.builder.ensure(Rustdoc { stage: run.builder.top_stage, target: run.target });
615 /// Generates compiler documentation.
617 /// This will generate all documentation for compiler and dependencies.
618 /// Compiler documentation is distributed separately, so we make sure
619 /// we do not merge it with the other documentation from std, test and
620 /// proc_macros. This is largely just a wrapper around `cargo doc`.
621 fn run(self, builder: &Builder<'_>) {
622 let stage = self.stage;
623 let target = self.target;
624 builder.info(&format!("Documenting stage{} rustdoc ({})", stage, target));
626 // This is the intended out directory for compiler documentation.
627 let out = builder.compiler_doc_out(target);
628 t!(fs::create_dir_all(&out));
630 let compiler = builder.compiler(stage, builder.config.build);
632 if !builder.config.compiler_docs {
633 builder.info("\tskipping - compiler/librustdoc docs disabled");
637 // Build rustc docs so that we generate relative links.
638 builder.ensure(Rustc { stage, target });
641 builder.ensure(tool::Rustdoc { compiler });
643 // Symlink compiler docs to the output directory of rustdoc documentation.
644 let out_dir = builder.stage_out(compiler, Mode::ToolRustc).join(target.triple).join("doc");
645 t!(fs::create_dir_all(&out_dir));
646 t!(symlink_dir_force(&builder.config, &out, &out_dir));
648 // Build cargo command.
649 let mut cargo = prepare_tool_cargo(
660 cargo.arg("-Zskip-rustdoc-fingerprint");
661 // Only include compiler crates, no dependencies of those, such as `libc`.
662 cargo.arg("--no-deps");
663 cargo.arg("-p").arg("rustdoc");
664 cargo.arg("-p").arg("rustdoc-json-types");
666 cargo.rustdocflag("--document-private-items");
667 cargo.rustdocflag("--enable-index-page");
668 cargo.rustdocflag("--show-type-layout");
669 cargo.rustdocflag("-Zunstable-options");
670 builder.run(&mut cargo.into());
674 #[derive(Ord, PartialOrd, Debug, Copy, Clone, Hash, PartialEq, Eq)]
675 pub struct ErrorIndex {
676 pub target: TargetSelection,
679 impl Step for ErrorIndex {
681 const DEFAULT: bool = true;
682 const ONLY_HOSTS: bool = true;
684 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
685 let builder = run.builder;
686 run.path("src/tools/error_index_generator").default_condition(builder.config.docs)
689 fn make_run(run: RunConfig<'_>) {
690 let target = run.target;
691 run.builder.ensure(ErrorIndex { target });
694 /// Generates the HTML rendered error-index by running the
695 /// `error_index_generator` tool.
696 fn run(self, builder: &Builder<'_>) {
697 builder.info(&format!("Documenting error index ({})", self.target));
698 let out = builder.doc_out(self.target);
699 t!(fs::create_dir_all(&out));
700 let mut index = tool::ErrorIndex::command(builder);
702 index.arg(out.join("error-index.html"));
703 index.arg(&builder.version);
705 builder.run(&mut index);
709 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
710 pub struct UnstableBookGen {
711 target: TargetSelection,
714 impl Step for UnstableBookGen {
716 const DEFAULT: bool = true;
717 const ONLY_HOSTS: bool = true;
719 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
720 let builder = run.builder;
721 run.path("src/tools/unstable-book-gen").default_condition(builder.config.docs)
724 fn make_run(run: RunConfig<'_>) {
725 run.builder.ensure(UnstableBookGen { target: run.target });
728 fn run(self, builder: &Builder<'_>) {
729 let target = self.target;
731 builder.info(&format!("Generating unstable book md files ({})", target));
732 let out = builder.md_doc_out(target).join("unstable-book");
733 builder.create_dir(&out);
734 builder.remove_dir(&out);
735 let mut cmd = builder.tool_cmd(Tool::UnstableBookGen);
736 cmd.arg(builder.src.join("library"));
737 cmd.arg(builder.src.join("compiler"));
738 cmd.arg(builder.src.join("src"));
741 builder.run(&mut cmd);
745 fn symlink_dir_force(config: &Config, src: &Path, dst: &Path) -> io::Result<()> {
749 if let Ok(m) = fs::symlink_metadata(dst) {
750 if m.file_type().is_dir() {
751 fs::remove_dir_all(dst)?;
753 // handle directory junctions on windows by falling back to
755 fs::remove_file(dst).or_else(|_| fs::remove_dir(dst))?;
759 symlink_dir(config, src, dst)
762 #[derive(Ord, PartialOrd, Debug, Copy, Clone, Hash, PartialEq, Eq)]
763 pub struct RustcBook {
764 pub compiler: Compiler,
765 pub target: TargetSelection,
769 impl Step for RustcBook {
771 const DEFAULT: bool = true;
772 const ONLY_HOSTS: bool = true;
774 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
775 let builder = run.builder;
776 run.path("src/doc/rustc").default_condition(builder.config.docs)
779 fn make_run(run: RunConfig<'_>) {
780 run.builder.ensure(RustcBook {
781 compiler: run.builder.compiler(run.builder.top_stage, run.builder.config.build),
787 /// Builds the rustc book.
789 /// The lints are auto-generated by a tool, and then merged into the book
790 /// in the "md-doc" directory in the build output directory. Then
791 /// "rustbook" is used to convert it to HTML.
792 fn run(self, builder: &Builder<'_>) {
793 let out_base = builder.md_doc_out(self.target).join("rustc");
794 t!(fs::create_dir_all(&out_base));
795 let out_listing = out_base.join("src/lints");
796 builder.cp_r(&builder.src.join("src/doc/rustc"), &out_base);
797 builder.info(&format!("Generating lint docs ({})", self.target));
799 let rustc = builder.rustc(self.compiler);
800 // The tool runs `rustc` for extracting output examples, so it needs a
801 // functional sysroot.
802 builder.ensure(compile::Std { compiler: self.compiler, target: self.target });
803 let mut cmd = builder.tool_cmd(Tool::LintDocs);
805 cmd.arg(builder.src.join("compiler"));
807 cmd.arg(&out_listing);
810 cmd.arg("--rustc-target").arg(&self.target.rustc_target_arg());
811 if builder.config.verbose() {
812 cmd.arg("--verbose");
815 cmd.arg("--validate");
817 // If the lib directories are in an unusual location (changed in
818 // config.toml), then this needs to explicitly update the dylib search
820 builder.add_rustc_lib_path(self.compiler, &mut cmd);
821 builder.run(&mut cmd);
822 // Run rustbook/mdbook to generate the HTML pages.
823 builder.ensure(RustbookSrc {
825 name: INTERNER.intern_str("rustc"),
826 src: INTERNER.intern_path(out_base),
828 if is_explicit_request(builder, "src/doc/rustc") {
829 let out = builder.doc_out(self.target);
830 let index = out.join("rustc").join("index.html");
831 open(builder, &index);