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Always compile rustdoc with debug logging enabled when download-rustc
is set
Previously, logging at DEBUG or below would always be silenced, because rustc compiles tracing with the `static_max_level_info` feature. That makes sense for release artifacts, but not for developing rustdoc. Instead, this compiles two different versions of tracing: one in the release artifacts, distributed in the sysroot, and a new version compiled by rustdoc. Since `rustc_driver` is always linked to the version of sysroot, this copy/pastes `init_env_logging` into rustdoc. The builds the second version of tracing unconditionally; see the code for details on why.
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@ -4452,6 +4452,9 @@ dependencies = [
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"serde_json",
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"smallvec 1.6.1",
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"tempfile",
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"tracing",
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"tracing-subscriber",
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"tracing-tree",
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]
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[[package]]
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@ -19,6 +19,13 @@ tempfile = "3"
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itertools = "0.9"
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regex = "1"
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rustdoc-json-types = { path = "../rustdoc-json-types" }
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tracing = "0.1"
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tracing-tree = "0.1.6"
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[dependencies.tracing-subscriber]
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version = "0.2.13"
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default-features = false
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features = ["fmt", "env-filter", "smallvec", "parking_lot", "ansi"]
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[dev-dependencies]
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expect-test = "1.0"
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@ -95,7 +95,19 @@ mod visit_lib;
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pub fn main() {
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rustc_driver::set_sigpipe_handler();
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rustc_driver::install_ice_hook();
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// When using CI artifacts (with `download_stage1 = true`), tracing is unconditionally built
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// with `--features=static_max_level_info`, which disables almost all rustdoc logging. To avoid
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// this, compile our own version of `tracing` that logs all levels.
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// NOTE: this compiles both versions of tracing unconditionally, because
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// - The compile time hit is not that bad, especially compared to rustdoc's incremental times, and
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// - Otherwise, there's no warning that logging is being ignored when `download_stage1 = true`.
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// NOTE: The reason this doesn't show double logging when `download_stage1 = false` and
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// `debug_logging = true` is because all rustc logging goes to its version of tracing (the one
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// in the sysroot), and all of rustdoc's logging goes to its version (the one in Cargo.toml).
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init_logging();
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rustc_driver::init_env_logger("RUSTDOC_LOG");
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let exit_code = rustc_driver::catch_with_exit_code(|| match get_args() {
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Some(args) => main_args(&args),
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_ => Err(ErrorReported),
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@ -103,6 +115,68 @@ pub fn main() {
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process::exit(exit_code);
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}
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fn init_logging() {
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use std::io;
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// FIXME remove these and use winapi 0.3 instead
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// Duplicates: bootstrap/compile.rs, librustc_errors/emitter.rs, rustc_driver/lib.rs
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#[cfg(unix)]
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fn stdout_isatty() -> bool {
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extern crate libc;
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unsafe { libc::isatty(libc::STDOUT_FILENO) != 0 }
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}
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#[cfg(windows)]
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fn stdout_isatty() -> bool {
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extern crate winapi;
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use winapi::um::consoleapi::GetConsoleMode;
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use winapi::um::processenv::GetStdHandle;
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use winapi::um::winbase::STD_OUTPUT_HANDLE;
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unsafe {
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let handle = GetStdHandle(STD_OUTPUT_HANDLE);
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let mut out = 0;
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GetConsoleMode(handle, &mut out) != 0
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}
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}
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let color_logs = match std::env::var("RUSTDOC_LOG_COLOR") {
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Ok(value) => match value.as_ref() {
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"always" => true,
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"never" => false,
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"auto" => stdout_isatty(),
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_ => early_error(
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ErrorOutputType::default(),
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&format!(
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"invalid log color value '{}': expected one of always, never, or auto",
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value
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),
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),
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},
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Err(std::env::VarError::NotPresent) => stdout_isatty(),
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Err(std::env::VarError::NotUnicode(_value)) => early_error(
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ErrorOutputType::default(),
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"non-Unicode log color value: expected one of always, never, or auto",
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),
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};
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let filter = tracing_subscriber::EnvFilter::from_env("RUSTDOC_LOG");
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let layer = tracing_tree::HierarchicalLayer::default()
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.with_writer(io::stderr)
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.with_indent_lines(true)
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.with_ansi(color_logs)
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.with_targets(true)
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.with_wraparound(10)
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.with_verbose_exit(true)
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.with_verbose_entry(true)
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.with_indent_amount(2);
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#[cfg(parallel_compiler)]
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let layer = layer.with_thread_ids(true).with_thread_names(true);
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use tracing_subscriber::layer::SubscriberExt;
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let subscriber = tracing_subscriber::Registry::default().with(filter).with(layer);
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tracing::subscriber::set_global_default(subscriber).unwrap();
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}
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fn get_args() -> Option<Vec<String>> {
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env::args_os()
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.enumerate()
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