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Compile rustdoc less often. #73883

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Jul 2, 2020
Merged

Compile rustdoc less often. #73883

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9154863
Compile rustdoc less often.
ehuss Jun 28, 2020
0b9bc79
Tests for number of times rustdoc is built with x.py test and doc.
ehuss Jul 1, 2020
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14 changes: 6 additions & 8 deletions src/bootstrap/doc.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -518,8 +518,7 @@ impl Step for Rustc {
let out = builder.compiler_doc_out(target);
t!(fs::create_dir_all(&out));

// Get the correct compiler for this stage.
let compiler = builder.compiler_for(stage, builder.config.build, target);
let compiler = builder.compiler(stage, builder.config.build);

if !builder.config.compiler_docs {
builder.info("\tskipping - compiler/librustdoc docs disabled");
Expand Down Expand Up @@ -599,8 +598,7 @@ impl Step for Rustdoc {
let out = builder.compiler_doc_out(target);
t!(fs::create_dir_all(&out));

// Get the correct compiler for this stage.
let compiler = builder.compiler_for(stage, builder.config.build, target);
let compiler = builder.compiler(stage, builder.config.build);

if !builder.config.compiler_docs {
builder.info("\tskipping - compiler/librustdoc docs disabled");
Expand Down Expand Up @@ -666,15 +664,15 @@ impl Step for ErrorIndex {
builder.info(&format!("Documenting error index ({})", target));
let out = builder.doc_out(target);
t!(fs::create_dir_all(&out));
let compiler = builder.compiler(2, builder.config.build);
// error_index_generator depends on librustdoc. Use the compiler that
// is normally used to build rustdoc for other documentation so that
// it shares the same artifacts.
let compiler = builder.compiler_for(builder.top_stage, builder.config.build, target);
let mut index = tool::ErrorIndex::command(builder, compiler);
index.arg("html");
index.arg(out.join("error-index.html"));
index.arg(crate::channel::CFG_RELEASE_NUM);

// FIXME: shouldn't have to pass this env var
index.env("CFG_BUILD", &builder.config.build);

builder.run(&mut index);
}
}
Expand Down
60 changes: 47 additions & 13 deletions src/bootstrap/test.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1454,8 +1454,11 @@ impl Step for ErrorIndex {
}

fn make_run(run: RunConfig<'_>) {
run.builder
.ensure(ErrorIndex { compiler: run.builder.compiler(run.builder.top_stage, run.host) });
// error_index_generator depends on librustdoc. Use the compiler that
// is normally used to build rustdoc for other tests (like compiletest
// tests in src/test/rustdoc) so that it shares the same artifacts.
let compiler = run.builder.compiler_for(run.builder.top_stage, run.host, run.host);
run.builder.ensure(ErrorIndex { compiler });
}

/// Runs the error index generator tool to execute the tests located in the error
Expand All @@ -1467,22 +1470,23 @@ impl Step for ErrorIndex {
fn run(self, builder: &Builder<'_>) {
let compiler = self.compiler;

builder.ensure(compile::Std { compiler, target: compiler.host });

let dir = testdir(builder, compiler.host);
t!(fs::create_dir_all(&dir));
let output = dir.join("error-index.md");

let mut tool = tool::ErrorIndex::command(
builder,
builder.compiler(compiler.stage, builder.config.build),
);
tool.arg("markdown").arg(&output).env("CFG_BUILD", &builder.config.build);
let mut tool = tool::ErrorIndex::command(builder, compiler);
tool.arg("markdown").arg(&output);

builder.info(&format!("Testing error-index stage{}", compiler.stage));
// Use the rustdoc that was built by self.compiler. This copy of
// rustdoc is shared with other tests (like compiletest tests in
// src/test/rustdoc). This helps avoid building rustdoc multiple
// times.
let rustdoc_compiler = builder.compiler(builder.top_stage, builder.config.build);
builder.info(&format!("Testing error-index stage{}", rustdoc_compiler.stage));
let _time = util::timeit(&builder);
builder.run_quiet(&mut tool);
markdown_test(builder, compiler, &output);
builder.ensure(compile::Std { compiler: rustdoc_compiler, target: rustdoc_compiler.host });
markdown_test(builder, rustdoc_compiler, &output);
}
}

Expand Down Expand Up @@ -1797,9 +1801,13 @@ impl Step for CrateRustdoc {

fn run(self, builder: &Builder<'_>) {
let test_kind = self.test_kind;
let target = self.host;

let compiler = builder.compiler(builder.top_stage, self.host);
let target = compiler.host;
// Use the previous stage compiler to reuse the artifacts that are
// created when running compiletest for src/test/rustdoc. If this used
// `compiler`, then it would cause rustdoc to be built *again*, which
// isn't really necessary.
let compiler = builder.compiler_for(builder.top_stage, target, target);
builder.ensure(compile::Rustc { compiler, target });

let mut cargo = tool::prepare_tool_cargo(
Expand All @@ -1825,6 +1833,32 @@ impl Step for CrateRustdoc {
cargo.arg("'-Ctarget-feature=-crt-static'");
}

// This is needed for running doctests on librustdoc. This is a bit of
// an unfortunate interaction with how bootstrap works and how cargo
// sets up the dylib path, and the fact that the doctest (in
// html/markdown.rs) links to rustc-private libs. For stage1, the
// compiler host dylibs (in stage1/lib) are not the same as the target
// dylibs (in stage1/lib/rustlib/...). This is different from a normal
// rust distribution where they are the same.
//
// On the cargo side, normal tests use `target_process` which handles
// setting up the dylib for a *target* (stage1/lib/rustlib/... in this
// case). However, for doctests it uses `rustdoc_process` which only
// sets up the dylib path for the *host* (stage1/lib), which is the
// wrong directory.
//
// It should be considered to just stop running doctests on
// librustdoc. There is only one test, and it doesn't look too
// important. There might be other ways to avoid this, but it seems
// pretty convoluted.
//
// See also https://github.com/rust-lang/rust/issues/13983 where the
// host vs target dylibs for rustdoc are consistently tricky to deal
// with.
let mut dylib_path = dylib_path();
dylib_path.insert(0, PathBuf::from(&*builder.sysroot_libdir(compiler, target)));
cargo.env(dylib_path_var(), env::join_paths(&dylib_path).unwrap());
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I would be on board with deleting that test - perhaps in a separate PR - and adding a tidy lint or something banning doc tests in librustdoc.


if !builder.config.verbose_tests {
cargo.arg("--quiet");
}
Expand Down
6 changes: 3 additions & 3 deletions src/bootstrap/tool.rs
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Expand Up @@ -392,9 +392,9 @@ impl Step for ErrorIndex {
fn make_run(run: RunConfig<'_>) {
// Compile the error-index in the same stage as rustdoc to avoid
// recompiling rustdoc twice if we can.
let stage = if run.builder.top_stage >= 2 { run.builder.top_stage } else { 0 };
run.builder
.ensure(ErrorIndex { compiler: run.builder.compiler(stage, run.builder.config.build) });
let host = run.builder.config.build;
let compiler = run.builder.compiler_for(run.builder.top_stage, host, host);
run.builder.ensure(ErrorIndex { compiler });
}

fn run(self, builder: &Builder<'_>) -> PathBuf {
Expand Down