src/bootstrap/config.rs

   1 //! Serialized configuration of a build.
   2 //!
   3 //! This module implements parsing `config.toml` configuration files to tweak
   4 //! how the build runs.
   5
   6 #[cfg(test)]
   7 mod tests;
   8
   9 use std::cell::{Cell, RefCell};
  10 use std::cmp;
  11 use std::collections::{HashMap, HashSet};
  12 use std::env;
  13 use std::fmt;
  14 use std::fs;
  15 use std::path::{Path, PathBuf};
  16 use std::process::Command;
  17 use std::str::FromStr;
  18
  19 use crate::builder::TaskPath;
  20 use crate::cache::{Interned, INTERNER};
  21 use crate::cc_detect::{ndk_compiler, Language};
  22 use crate::channel::{self, GitInfo};
  23 pub use crate::flags::Subcommand;
  24 use crate::flags::{Color, Flags};
  25 use crate::util::{exe, output, t};
  26 use once_cell::sync::OnceCell;
  27 use serde::{Deserialize, Deserializer};
  28
  29 macro_rules! check_ci_llvm {
  30     ($name:expr) => {
  31         assert!(
  32             $name.is_none(),
  33             "setting {} is incompatible with download-ci-llvm.",
  34             stringify!($name)
  35         );
  36     };
  37 }
  38
  39 #[derive(Clone, Default)]
  40 pub enum DryRun {
  41     /// This isn't a dry run.
  42     #[default]
  43     Disabled,
  44     /// This is a dry run enabled by bootstrap itself, so it can verify that no work is done.
  45     SelfCheck,
  46     /// This is a dry run enabled by the `--dry-run` flag.
  47     UserSelected,
  48 }
  49
  50 /// Global configuration for the entire build and/or bootstrap.
  51 ///
  52 /// This structure is parsed from `config.toml`, and some of the fields are inferred from `git` or build-time parameters.
  53 ///
  54 /// Note that this structure is not decoded directly into, but rather it is
  55 /// filled out from the decoded forms of the structs below. For documentation
  56 /// each field, see the corresponding fields in
  57 /// `config.toml.example`.
  58 #[derive(Default)]
  59 #[cfg_attr(test, derive(Clone))]
  60 pub struct Config {
  61     pub changelog_seen: Option<usize>,
  62     pub ccache: Option<String>,
  63     /// Call Build::ninja() instead of this.
  64     pub ninja_in_file: bool,
  65     pub verbose: usize,
  66     pub submodules: Option<bool>,
  67     pub compiler_docs: bool,
  68     pub docs_minification: bool,
  69     pub docs: bool,
  70     pub locked_deps: bool,
  71     pub vendor: bool,
  72     pub target_config: HashMap<TargetSelection, Target>,
  73     pub full_bootstrap: bool,
  74     pub extended: bool,
  75     pub tools: Option<HashSet<String>>,
  76     pub sanitizers: bool,
  77     pub profiler: bool,
  78     pub ignore_git: bool,
  79     pub exclude: Vec<TaskPath>,
  80     pub include_default_paths: bool,
  81     pub rustc_error_format: Option<String>,
  82     pub json_output: bool,
  83     pub test_compare_mode: bool,
  84     pub color: Color,
  85     pub patch_binaries_for_nix: bool,
  86     pub stage0_metadata: Stage0Metadata,
  87
  88     pub on_fail: Option<String>,
  89     pub stage: u32,
  90     pub keep_stage: Vec<u32>,
  91     pub keep_stage_std: Vec<u32>,
  92     pub src: PathBuf,
  93     /// defaults to `config.toml`
  94     pub config: Option<PathBuf>,
  95     pub jobs: Option<u32>,
  96     pub cmd: Subcommand,
  97     pub incremental: bool,
  98     pub dry_run: DryRun,
  99     /// `None` if we shouldn't download CI compiler artifacts, or the commit to download if we should.
 100     #[cfg(not(test))]
 101     download_rustc_commit: Option<String>,
 102     #[cfg(test)]
 103     pub download_rustc_commit: Option<String>,
 104
 105     pub deny_warnings: bool,
 106     pub backtrace_on_ice: bool,
 107
 108     // llvm codegen options
 109     pub llvm_skip_rebuild: bool,
 110     pub llvm_assertions: bool,
 111     pub llvm_tests: bool,
 112     pub llvm_plugins: bool,
 113     pub llvm_optimize: bool,
 114     pub llvm_thin_lto: bool,
 115     pub llvm_release_debuginfo: bool,
 116     pub llvm_version_check: bool,
 117     pub llvm_static_stdcpp: bool,
 118     /// `None` if `llvm_from_ci` is true and we haven't yet downloaded llvm.
 119     #[cfg(not(test))]
 120     llvm_link_shared: Cell<Option<bool>>,
 121     #[cfg(test)]
 122     pub llvm_link_shared: Cell<Option<bool>>,
 123     pub llvm_clang_cl: Option<String>,
 124     pub llvm_targets: Option<String>,
 125     pub llvm_experimental_targets: Option<String>,
 126     pub llvm_link_jobs: Option<u32>,
 127     pub llvm_version_suffix: Option<String>,
 128     pub llvm_use_linker: Option<String>,
 129     pub llvm_allow_old_toolchain: bool,
 130     pub llvm_polly: bool,
 131     pub llvm_clang: bool,
 132     pub llvm_from_ci: bool,
 133     pub llvm_build_config: HashMap<String, String>,
 134
 135     pub use_lld: bool,
 136     pub lld_enabled: bool,
 137     pub llvm_tools_enabled: bool,
 138
 139     pub llvm_cflags: Option<String>,
 140     pub llvm_cxxflags: Option<String>,
 141     pub llvm_ldflags: Option<String>,
 142     pub llvm_use_libcxx: bool,
 143
 144     // rust codegen options
 145     pub rust_optimize: bool,
 146     pub rust_codegen_units: Option<u32>,
 147     pub rust_codegen_units_std: Option<u32>,
 148     pub rust_debug_assertions: bool,
 149     pub rust_debug_assertions_std: bool,
 150     pub rust_overflow_checks: bool,
 151     pub rust_overflow_checks_std: bool,
 152     pub rust_debug_logging: bool,
 153     pub rust_debuginfo_level_rustc: u32,
 154     pub rust_debuginfo_level_std: u32,
 155     pub rust_debuginfo_level_tools: u32,
 156     pub rust_debuginfo_level_tests: u32,
 157     pub rust_split_debuginfo: SplitDebuginfo,
 158     pub rust_rpath: bool,
 159     pub rustc_parallel: bool,
 160     pub rustc_default_linker: Option<String>,
 161     pub rust_optimize_tests: bool,
 162     pub rust_dist_src: bool,
 163     pub rust_codegen_backends: Vec<Interned<String>>,
 164     pub rust_verify_llvm_ir: bool,
 165     pub rust_thin_lto_import_instr_limit: Option<u32>,
 166     pub rust_remap_debuginfo: bool,
 167     pub rust_new_symbol_mangling: Option<bool>,
 168     pub rust_profile_use: Option<String>,
 169     pub rust_profile_generate: Option<String>,
 170     pub rust_lto: RustcLto,
 171     pub llvm_profile_use: Option<String>,
 172     pub llvm_profile_generate: bool,
 173     pub llvm_libunwind_default: Option<LlvmLibunwind>,
 174     pub llvm_bolt_profile_generate: bool,
 175     pub llvm_bolt_profile_use: Option<String>,
 176
 177     pub build: TargetSelection,
 178     pub hosts: Vec<TargetSelection>,
 179     pub targets: Vec<TargetSelection>,
 180     pub local_rebuild: bool,
 181     pub jemalloc: bool,
 182     pub control_flow_guard: bool,
 183
 184     // dist misc
 185     pub dist_sign_folder: Option<PathBuf>,
 186     pub dist_upload_addr: Option<String>,
 187     pub dist_compression_formats: Option<Vec<String>>,
 188
 189     // libstd features
 190     pub backtrace: bool, // support for RUST_BACKTRACE
 191
 192     // misc
 193     pub low_priority: bool,
 194     pub channel: String,
 195     pub description: Option<String>,
 196     pub verbose_tests: bool,
 197     pub save_toolstates: Option<PathBuf>,
 198     pub print_step_timings: bool,
 199     pub print_step_rusage: bool,
 200     pub missing_tools: bool,
 201
 202     // Fallback musl-root for all targets
 203     pub musl_root: Option<PathBuf>,
 204     pub prefix: Option<PathBuf>,
 205     pub sysconfdir: Option<PathBuf>,
 206     pub datadir: Option<PathBuf>,
 207     pub docdir: Option<PathBuf>,
 208     pub bindir: PathBuf,
 209     pub libdir: Option<PathBuf>,
 210     pub mandir: Option<PathBuf>,
 211     pub codegen_tests: bool,
 212     pub nodejs: Option<PathBuf>,
 213     pub npm: Option<PathBuf>,
 214     pub gdb: Option<PathBuf>,
 215     pub python: Option<PathBuf>,
 216     pub reuse: Option<PathBuf>,
 217     pub cargo_native_static: bool,
 218     pub configure_args: Vec<String>,
 219
 220     // These are either the stage0 downloaded binaries or the locally installed ones.
 221     pub initial_cargo: PathBuf,
 222     pub initial_rustc: PathBuf,
 223     #[cfg(not(test))]
 224     initial_rustfmt: RefCell<RustfmtState>,
 225     #[cfg(test)]
 226     pub initial_rustfmt: RefCell<RustfmtState>,
 227     pub out: PathBuf,
 228     pub rust_info: channel::GitInfo,
 229 }
 230
 231 #[derive(Default, Deserialize)]
 232 #[cfg_attr(test, derive(Clone))]
 233 pub struct Stage0Metadata {
 234     pub config: Stage0Config,
 235     pub checksums_sha256: HashMap<String, String>,
 236     pub rustfmt: Option<RustfmtMetadata>,
 237 }
 238 #[derive(Default, Deserialize)]
 239 #[cfg_attr(test, derive(Clone))]
 240 pub struct Stage0Config {
 241     pub dist_server: String,
 242     pub artifacts_server: String,
 243     pub artifacts_with_llvm_assertions_server: String,
 244     pub git_merge_commit_email: String,
 245     pub nightly_branch: String,
 246 }
 247 #[derive(Default, Deserialize)]
 248 #[cfg_attr(test, derive(Clone))]
 249 pub struct RustfmtMetadata {
 250     pub date: String,
 251     pub version: String,
 252 }
 253
 254 #[derive(Clone, Debug)]
 255 pub enum RustfmtState {
 256     SystemToolchain(PathBuf),
 257     Downloaded(PathBuf),
 258     Unavailable,
 259     LazyEvaluated,
 260 }
 261
 262 impl Default for RustfmtState {
 263     fn default() -> Self {
 264         RustfmtState::LazyEvaluated
 265     }
 266 }
 267
 268 #[derive(Debug, Clone, Copy, PartialEq)]
 269 pub enum LlvmLibunwind {
 270     No,
 271     InTree,
 272     System,
 273 }
 274
 275 impl Default for LlvmLibunwind {
 276     fn default() -> Self {
 277         Self::No
 278     }
 279 }
 280
 281 impl FromStr for LlvmLibunwind {
 282     type Err = String;
 283
 284     fn from_str(value: &str) -> Result<Self, Self::Err> {
 285         match value {
 286             "no" => Ok(Self::No),
 287             "in-tree" => Ok(Self::InTree),
 288             "system" => Ok(Self::System),
 289             invalid => Err(format!("Invalid value '{}' for rust.llvm-libunwind config.", invalid)),
 290         }
 291     }
 292 }
 293
 294 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 295 pub enum SplitDebuginfo {
 296     Packed,
 297     Unpacked,
 298     Off,
 299 }
 300
 301 impl Default for SplitDebuginfo {
 302     fn default() -> Self {
 303         SplitDebuginfo::Off
 304     }
 305 }
 306
 307 impl std::str::FromStr for SplitDebuginfo {
 308     type Err = ();
 309
 310     fn from_str(s: &str) -> Result<Self, Self::Err> {
 311         match s {
 312             "packed" => Ok(SplitDebuginfo::Packed),
 313             "unpacked" => Ok(SplitDebuginfo::Unpacked),
 314             "off" => Ok(SplitDebuginfo::Off),
 315             _ => Err(()),
 316         }
 317     }
 318 }
 319
 320 impl SplitDebuginfo {
 321     /// Returns the default `-Csplit-debuginfo` value for the current target. See the comment for
 322     /// `rust.split-debuginfo` in `config.toml.example`.
 323     fn default_for_platform(target: &str) -> Self {
 324         if target.contains("apple") {
 325             SplitDebuginfo::Unpacked
 326         } else if target.contains("windows") {
 327             SplitDebuginfo::Packed
 328         } else {
 329             SplitDebuginfo::Off
 330         }
 331     }
 332 }
 333
 334 /// LTO mode used for compiling rustc itself.
 335 #[derive(Default, Clone)]
 336 pub enum RustcLto {
 337     #[default]
 338     ThinLocal,
 339     Thin,
 340     Fat,
 341 }
 342
 343 impl std::str::FromStr for RustcLto {
 344     type Err = String;
 345
 346     fn from_str(s: &str) -> Result<Self, Self::Err> {
 347         match s {
 348             "thin-local" => Ok(RustcLto::ThinLocal),
 349             "thin" => Ok(RustcLto::Thin),
 350             "fat" => Ok(RustcLto::Fat),
 351             _ => Err(format!("Invalid value for rustc LTO: {}", s)),
 352         }
 353     }
 354 }
 355
 356 #[derive(Copy, Clone, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
 357 pub struct TargetSelection {
 358     pub triple: Interned<String>,
 359     file: Option<Interned<String>>,
 360 }
 361
 362 impl TargetSelection {
 363     pub fn from_user(selection: &str) -> Self {
 364         let path = Path::new(selection);
 365
 366         let (triple, file) = if path.exists() {
 367             let triple = path
 368                 .file_stem()
 369                 .expect("Target specification file has no file stem")
 370                 .to_str()
 371                 .expect("Target specification file stem is not UTF-8");
 372
 373             (triple, Some(selection))
 374         } else {
 375             (selection, None)
 376         };
 377
 378         let triple = INTERNER.intern_str(triple);
 379         let file = file.map(|f| INTERNER.intern_str(f));
 380
 381         Self { triple, file }
 382     }
 383
 384     pub fn rustc_target_arg(&self) -> &str {
 385         self.file.as_ref().unwrap_or(&self.triple)
 386     }
 387
 388     pub fn contains(&self, needle: &str) -> bool {
 389         self.triple.contains(needle)
 390     }
 391
 392     pub fn starts_with(&self, needle: &str) -> bool {
 393         self.triple.starts_with(needle)
 394     }
 395
 396     pub fn ends_with(&self, needle: &str) -> bool {
 397         self.triple.ends_with(needle)
 398     }
 399 }
 400
 401 impl fmt::Display for TargetSelection {
 402     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 403         write!(f, "{}", self.triple)?;
 404         if let Some(file) = self.file {
 405             write!(f, "({})", file)?;
 406         }
 407         Ok(())
 408     }
 409 }
 410
 411 impl fmt::Debug for TargetSelection {
 412     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 413         write!(f, "{}", self)
 414     }
 415 }
 416
 417 impl PartialEq<&str> for TargetSelection {
 418     fn eq(&self, other: &&str) -> bool {
 419         self.triple == *other
 420     }
 421 }
 422
 423 /// Per-target configuration stored in the global configuration structure.
 424 #[derive(Default)]
 425 #[cfg_attr(test, derive(Clone))]
 426 pub struct Target {
 427     /// Some(path to llvm-config) if using an external LLVM.
 428     pub llvm_config: Option<PathBuf>,
 429     pub llvm_has_rust_patches: Option<bool>,
 430     /// Some(path to FileCheck) if one was specified.
 431     pub llvm_filecheck: Option<PathBuf>,
 432     pub llvm_libunwind: Option<LlvmLibunwind>,
 433     pub cc: Option<PathBuf>,
 434     pub cxx: Option<PathBuf>,
 435     pub ar: Option<PathBuf>,
 436     pub ranlib: Option<PathBuf>,
 437     pub default_linker: Option<PathBuf>,
 438     pub linker: Option<PathBuf>,
 439     pub ndk: Option<PathBuf>,
 440     pub sanitizers: Option<bool>,
 441     pub profiler: Option<bool>,
 442     pub crt_static: Option<bool>,
 443     pub musl_root: Option<PathBuf>,
 444     pub musl_libdir: Option<PathBuf>,
 445     pub wasi_root: Option<PathBuf>,
 446     pub qemu_rootfs: Option<PathBuf>,
 447     pub no_std: bool,
 448 }
 449
 450 impl Target {
 451     pub fn from_triple(triple: &str) -> Self {
 452         let mut target: Self = Default::default();
 453         if triple.contains("-none")
 454             || triple.contains("nvptx")
 455             || triple.contains("switch")
 456             || triple.contains("-uefi")
 457         {
 458             target.no_std = true;
 459         }
 460         target
 461     }
 462 }
 463 /// Structure of the `config.toml` file that configuration is read from.
 464 ///
 465 /// This structure uses `Decodable` to automatically decode a TOML configuration
 466 /// file into this format, and then this is traversed and written into the above
 467 /// `Config` structure.
 468 #[derive(Deserialize, Default)]
 469 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 470 struct TomlConfig {
 471     changelog_seen: Option<usize>,
 472     build: Option<Build>,
 473     install: Option<Install>,
 474     llvm: Option<Llvm>,
 475     rust: Option<Rust>,
 476     target: Option<HashMap<String, TomlTarget>>,
 477     dist: Option<Dist>,
 478     profile: Option<String>,
 479 }
 480
 481 trait Merge {
 482     fn merge(&mut self, other: Self);
 483 }
 484
 485 impl Merge for TomlConfig {
 486     fn merge(
 487         &mut self,
 488         TomlConfig { build, install, llvm, rust, dist, target, profile: _, changelog_seen: _ }: Self,
 489     ) {
 490         fn do_merge<T: Merge>(x: &mut Option<T>, y: Option<T>) {
 491             if let Some(new) = y {
 492                 if let Some(original) = x {
 493                     original.merge(new);
 494                 } else {
 495                     *x = Some(new);
 496                 }
 497             }
 498         }
 499         do_merge(&mut self.build, build);
 500         do_merge(&mut self.install, install);
 501         do_merge(&mut self.llvm, llvm);
 502         do_merge(&mut self.rust, rust);
 503         do_merge(&mut self.dist, dist);
 504         assert!(target.is_none(), "merging target-specific config is not currently supported");
 505     }
 506 }
 507
 508 // We are using a decl macro instead of a derive proc macro here to reduce the compile time of
 509 // rustbuild.
 510 macro_rules! define_config {
 511     ($(#[$attr:meta])* struct $name:ident {
 512         $($field:ident: Option<$field_ty:ty> = $field_key:literal,)*
 513     }) => {
 514         $(#[$attr])*
 515         struct $name {
 516             $($field: Option<$field_ty>,)*
 517         }
 518
 519         impl Merge for $name {
 520             fn merge(&mut self, other: Self) {
 521                 $(
 522                     if !self.$field.is_some() {
 523                         self.$field = other.$field;
 524                     }
 525                 )*
 526             }
 527         }
 528
 529         // The following is a trimmed version of what serde_derive generates. All parts not relevant
 530         // for toml deserialization have been removed. This reduces the binary size and improves
 531         // compile time of rustbuild.
 532         impl<'de> Deserialize<'de> for $name {
 533             fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
 534             where
 535                 D: Deserializer<'de>,
 536             {
 537                 struct Field;
 538                 impl<'de> serde::de::Visitor<'de> for Field {
 539                     type Value = $name;
 540                     fn expecting(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
 541                         f.write_str(concat!("struct ", stringify!($name)))
 542                     }
 543
 544                     #[inline]
 545                     fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
 546                     where
 547                         A: serde::de::MapAccess<'de>,
 548                     {
 549                         $(let mut $field: Option<$field_ty> = None;)*
 550                         while let Some(key) =
 551                             match serde::de::MapAccess::next_key::<String>(&mut map) {
 552                                 Ok(val) => val,
 553                                 Err(err) => {
 554                                     return Err(err);
 555                                 }
 556                             }
 557                         {
 558                             match &*key {
 559                                 $($field_key => {
 560                                     if $field.is_some() {
 561                                         return Err(<A::Error as serde::de::Error>::duplicate_field(
 562                                             $field_key,
 563                                         ));
 564                                     }
 565                                     $field = match serde::de::MapAccess::next_value::<$field_ty>(
 566                                         &mut map,
 567                                     ) {
 568                                         Ok(val) => Some(val),
 569                                         Err(err) => {
 570                                             return Err(err);
 571                                         }
 572                                     };
 573                                 })*
 574                                 key => {
 575                                     return Err(serde::de::Error::unknown_field(key, FIELDS));
 576                                 }
 577                             }
 578                         }
 579                         Ok($name { $($field),* })
 580                     }
 581                 }
 582                 const FIELDS: &'static [&'static str] = &[
 583                     $($field_key,)*
 584                 ];
 585                 Deserializer::deserialize_struct(
 586                     deserializer,
 587                     stringify!($name),
 588                     FIELDS,
 589                     Field,
 590                 )
 591             }
 592         }
 593     }
 594 }
 595
 596 define_config! {
 597     /// TOML representation of various global build decisions.
 598     #[derive(Default)]
 599     struct Build {
 600         build: Option<String> = "build",
 601         host: Option<Vec<String>> = "host",
 602         target: Option<Vec<String>> = "target",
 603         build_dir: Option<String> = "build-dir",
 604         cargo: Option<String> = "cargo",
 605         rustc: Option<String> = "rustc",
 606         rustfmt: Option<PathBuf> = "rustfmt",
 607         docs: Option<bool> = "docs",
 608         compiler_docs: Option<bool> = "compiler-docs",
 609         docs_minification: Option<bool> = "docs-minification",
 610         submodules: Option<bool> = "submodules",
 611         gdb: Option<String> = "gdb",
 612         nodejs: Option<String> = "nodejs",
 613         npm: Option<String> = "npm",
 614         python: Option<String> = "python",
 615         reuse: Option<String> = "reuse",
 616         locked_deps: Option<bool> = "locked-deps",
 617         vendor: Option<bool> = "vendor",
 618         full_bootstrap: Option<bool> = "full-bootstrap",
 619         extended: Option<bool> = "extended",
 620         tools: Option<HashSet<String>> = "tools",
 621         verbose: Option<usize> = "verbose",
 622         sanitizers: Option<bool> = "sanitizers",
 623         profiler: Option<bool> = "profiler",
 624         cargo_native_static: Option<bool> = "cargo-native-static",
 625         low_priority: Option<bool> = "low-priority",
 626         configure_args: Option<Vec<String>> = "configure-args",
 627         local_rebuild: Option<bool> = "local-rebuild",
 628         print_step_timings: Option<bool> = "print-step-timings",
 629         print_step_rusage: Option<bool> = "print-step-rusage",
 630         check_stage: Option<u32> = "check-stage",
 631         doc_stage: Option<u32> = "doc-stage",
 632         build_stage: Option<u32> = "build-stage",
 633         test_stage: Option<u32> = "test-stage",
 634         install_stage: Option<u32> = "install-stage",
 635         dist_stage: Option<u32> = "dist-stage",
 636         bench_stage: Option<u32> = "bench-stage",
 637         patch_binaries_for_nix: Option<bool> = "patch-binaries-for-nix",
 638         // NOTE: only parsed by bootstrap.py, `--feature build-metrics` enables metrics unconditionally
 639         metrics: Option<bool> = "metrics",
 640     }
 641 }
 642
 643 define_config! {
 644     /// TOML representation of various global install decisions.
 645     struct Install {
 646         prefix: Option<String> = "prefix",
 647         sysconfdir: Option<String> = "sysconfdir",
 648         docdir: Option<String> = "docdir",
 649         bindir: Option<String> = "bindir",
 650         libdir: Option<String> = "libdir",
 651         mandir: Option<String> = "mandir",
 652         datadir: Option<String> = "datadir",
 653     }
 654 }
 655
 656 define_config! {
 657     /// TOML representation of how the LLVM build is configured.
 658     struct Llvm {
 659         skip_rebuild: Option<bool> = "skip-rebuild",
 660         optimize: Option<bool> = "optimize",
 661         thin_lto: Option<bool> = "thin-lto",
 662         release_debuginfo: Option<bool> = "release-debuginfo",
 663         assertions: Option<bool> = "assertions",
 664         tests: Option<bool> = "tests",
 665         plugins: Option<bool> = "plugins",
 666         ccache: Option<StringOrBool> = "ccache",
 667         version_check: Option<bool> = "version-check",
 668         static_libstdcpp: Option<bool> = "static-libstdcpp",
 669         ninja: Option<bool> = "ninja",
 670         targets: Option<String> = "targets",
 671         experimental_targets: Option<String> = "experimental-targets",
 672         link_jobs: Option<u32> = "link-jobs",
 673         link_shared: Option<bool> = "link-shared",
 674         version_suffix: Option<String> = "version-suffix",
 675         clang_cl: Option<String> = "clang-cl",
 676         cflags: Option<String> = "cflags",
 677         cxxflags: Option<String> = "cxxflags",
 678         ldflags: Option<String> = "ldflags",
 679         use_libcxx: Option<bool> = "use-libcxx",
 680         use_linker: Option<String> = "use-linker",
 681         allow_old_toolchain: Option<bool> = "allow-old-toolchain",
 682         polly: Option<bool> = "polly",
 683         clang: Option<bool> = "clang",
 684         download_ci_llvm: Option<StringOrBool> = "download-ci-llvm",
 685         build_config: Option<HashMap<String, String>> = "build-config",
 686     }
 687 }
 688
 689 define_config! {
 690     struct Dist {
 691         sign_folder: Option<String> = "sign-folder",
 692         gpg_password_file: Option<String> = "gpg-password-file",
 693         upload_addr: Option<String> = "upload-addr",
 694         src_tarball: Option<bool> = "src-tarball",
 695         missing_tools: Option<bool> = "missing-tools",
 696         compression_formats: Option<Vec<String>> = "compression-formats",
 697     }
 698 }
 699
 700 #[derive(Debug, Deserialize)]
 701 #[serde(untagged)]
 702 enum StringOrBool {
 703     String(String),
 704     Bool(bool),
 705 }
 706
 707 impl Default for StringOrBool {
 708     fn default() -> StringOrBool {
 709         StringOrBool::Bool(false)
 710     }
 711 }
 712
 713 define_config! {
 714     /// TOML representation of how the Rust build is configured.
 715     struct Rust {
 716         optimize: Option<bool> = "optimize",
 717         debug: Option<bool> = "debug",
 718         codegen_units: Option<u32> = "codegen-units",
 719         codegen_units_std: Option<u32> = "codegen-units-std",
 720         debug_assertions: Option<bool> = "debug-assertions",
 721         debug_assertions_std: Option<bool> = "debug-assertions-std",
 722         overflow_checks: Option<bool> = "overflow-checks",
 723         overflow_checks_std: Option<bool> = "overflow-checks-std",
 724         debug_logging: Option<bool> = "debug-logging",
 725         debuginfo_level: Option<u32> = "debuginfo-level",
 726         debuginfo_level_rustc: Option<u32> = "debuginfo-level-rustc",
 727         debuginfo_level_std: Option<u32> = "debuginfo-level-std",
 728         debuginfo_level_tools: Option<u32> = "debuginfo-level-tools",
 729         debuginfo_level_tests: Option<u32> = "debuginfo-level-tests",
 730         split_debuginfo: Option<String> = "split-debuginfo",
 731         run_dsymutil: Option<bool> = "run-dsymutil",
 732         backtrace: Option<bool> = "backtrace",
 733         incremental: Option<bool> = "incremental",
 734         parallel_compiler: Option<bool> = "parallel-compiler",
 735         default_linker: Option<String> = "default-linker",
 736         channel: Option<String> = "channel",
 737         description: Option<String> = "description",
 738         musl_root: Option<String> = "musl-root",
 739         rpath: Option<bool> = "rpath",
 740         verbose_tests: Option<bool> = "verbose-tests",
 741         optimize_tests: Option<bool> = "optimize-tests",
 742         codegen_tests: Option<bool> = "codegen-tests",
 743         ignore_git: Option<bool> = "ignore-git",
 744         dist_src: Option<bool> = "dist-src",
 745         save_toolstates: Option<String> = "save-toolstates",
 746         codegen_backends: Option<Vec<String>> = "codegen-backends",
 747         lld: Option<bool> = "lld",
 748         use_lld: Option<bool> = "use-lld",
 749         llvm_tools: Option<bool> = "llvm-tools",
 750         deny_warnings: Option<bool> = "deny-warnings",
 751         backtrace_on_ice: Option<bool> = "backtrace-on-ice",
 752         verify_llvm_ir: Option<bool> = "verify-llvm-ir",
 753         thin_lto_import_instr_limit: Option<u32> = "thin-lto-import-instr-limit",
 754         remap_debuginfo: Option<bool> = "remap-debuginfo",
 755         jemalloc: Option<bool> = "jemalloc",
 756         test_compare_mode: Option<bool> = "test-compare-mode",
 757         llvm_libunwind: Option<String> = "llvm-libunwind",
 758         control_flow_guard: Option<bool> = "control-flow-guard",
 759         new_symbol_mangling: Option<bool> = "new-symbol-mangling",
 760         profile_generate: Option<String> = "profile-generate",
 761         profile_use: Option<String> = "profile-use",
 762         // ignored; this is set from an env var set by bootstrap.py
 763         download_rustc: Option<StringOrBool> = "download-rustc",
 764         lto: Option<String> = "lto",
 765     }
 766 }
 767
 768 define_config! {
 769     /// TOML representation of how each build target is configured.
 770     struct TomlTarget {
 771         cc: Option<String> = "cc",
 772         cxx: Option<String> = "cxx",
 773         ar: Option<String> = "ar",
 774         ranlib: Option<String> = "ranlib",
 775         default_linker: Option<PathBuf> = "default-linker",
 776         linker: Option<String> = "linker",
 777         llvm_config: Option<String> = "llvm-config",
 778         llvm_has_rust_patches: Option<bool> = "llvm-has-rust-patches",
 779         llvm_filecheck: Option<String> = "llvm-filecheck",
 780         llvm_libunwind: Option<String> = "llvm-libunwind",
 781         android_ndk: Option<String> = "android-ndk",
 782         sanitizers: Option<bool> = "sanitizers",
 783         profiler: Option<bool> = "profiler",
 784         crt_static: Option<bool> = "crt-static",
 785         musl_root: Option<String> = "musl-root",
 786         musl_libdir: Option<String> = "musl-libdir",
 787         wasi_root: Option<String> = "wasi-root",
 788         qemu_rootfs: Option<String> = "qemu-rootfs",
 789         no_std: Option<bool> = "no-std",
 790     }
 791 }
 792
 793 impl Config {
 794     pub fn default_opts() -> Config {
 795         let mut config = Config::default();
 796         config.llvm_optimize = true;
 797         config.ninja_in_file = true;
 798         config.llvm_version_check = true;
 799         config.llvm_static_stdcpp = false;
 800         config.backtrace = true;
 801         config.rust_optimize = true;
 802         config.rust_optimize_tests = true;
 803         config.submodules = None;
 804         config.docs = true;
 805         config.docs_minification = true;
 806         config.rust_rpath = true;
 807         config.channel = "dev".to_string();
 808         config.codegen_tests = true;
 809         config.rust_dist_src = true;
 810         config.rust_codegen_backends = vec![INTERNER.intern_str("llvm")];
 811         config.deny_warnings = true;
 812         config.bindir = "bin".into();
 813
 814         // set by build.rs
 815         config.build = TargetSelection::from_user(&env!("BUILD_TRIPLE"));
 816
 817         let manifest_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
 818         // Undo `src/bootstrap`
 819         config.src = manifest_dir.parent().unwrap().parent().unwrap().to_owned();
 820         config.out = PathBuf::from("build");
 821
 822         config
 823     }
 824
 825     pub fn parse(args: &[String]) -> Config {
 826         #[cfg(test)]
 827         let get_toml = |_: &_| TomlConfig::default();
 828         #[cfg(not(test))]
 829         let get_toml = |file: &Path| {
 830             let contents =
 831                 t!(fs::read_to_string(file), format!("config file {} not found", file.display()));
 832             // Deserialize to Value and then TomlConfig to prevent the Deserialize impl of
 833             // TomlConfig and sub types to be monomorphized 5x by toml.
 834             match toml::from_str(&contents)
 835                 .and_then(|table: toml::Value| TomlConfig::deserialize(table))
 836             {
 837                 Ok(table) => table,
 838                 Err(err) => {
 839                     eprintln!("failed to parse TOML configuration '{}': {}", file.display(), err);
 840                     crate::detail_exit(2);
 841                 }
 842             }
 843         };
 844
 845         Self::parse_inner(args, get_toml)
 846     }
 847
 848     fn parse_inner<'a>(args: &[String], get_toml: impl 'a + Fn(&Path) -> TomlConfig) -> Config {
 849         let flags = Flags::parse(&args);
 850         let mut config = Config::default_opts();
 851
 852         // Set flags.
 853         config.exclude = flags.exclude.into_iter().map(|path| TaskPath::parse(path)).collect();
 854         config.include_default_paths = flags.include_default_paths;
 855         config.rustc_error_format = flags.rustc_error_format;
 856         config.json_output = flags.json_output;
 857         config.on_fail = flags.on_fail;
 858         config.jobs = flags.jobs.map(threads_from_config);
 859         config.cmd = flags.cmd;
 860         config.incremental = flags.incremental;
 861         config.dry_run = if flags.dry_run { DryRun::UserSelected } else { DryRun::Disabled };
 862         config.keep_stage = flags.keep_stage;
 863         config.keep_stage_std = flags.keep_stage_std;
 864         config.color = flags.color;
 865         if let Some(value) = flags.deny_warnings {
 866             config.deny_warnings = value;
 867         }
 868         config.llvm_profile_use = flags.llvm_profile_use;
 869         config.llvm_profile_generate = flags.llvm_profile_generate;
 870         config.llvm_bolt_profile_generate = flags.llvm_bolt_profile_generate;
 871         config.llvm_bolt_profile_use = flags.llvm_bolt_profile_use;
 872
 873         if config.llvm_bolt_profile_generate && config.llvm_bolt_profile_use.is_some() {
 874             eprintln!(
 875                 "Cannot use both `llvm_bolt_profile_generate` and `llvm_bolt_profile_use` at the same time"
 876             );
 877             crate::detail_exit(1);
 878         }
 879
 880         // Infer the rest of the configuration.
 881
 882         // Infer the source directory. This is non-trivial because we want to support a downloaded bootstrap binary,
 883         // running on a completely machine from where it was compiled.
 884         let mut cmd = Command::new("git");
 885         // NOTE: we cannot support running from outside the repository because the only path we have available
 886         // is set at compile time, which can be wrong if bootstrap was downloaded from source.
 887         // We still support running outside the repository if we find we aren't in a git directory.
 888         cmd.arg("rev-parse").arg("--show-toplevel");
 889         // Discard stderr because we expect this to fail when building from a tarball.
 890         let output = cmd
 891             .stderr(std::process::Stdio::null())
 892             .output()
 893             .ok()
 894             .and_then(|output| if output.status.success() { Some(output) } else { None });
 895         if let Some(output) = output {
 896             let git_root = String::from_utf8(output.stdout).unwrap();
 897             // We need to canonicalize this path to make sure it uses backslashes instead of forward slashes.
 898             let git_root = PathBuf::from(git_root.trim()).canonicalize().unwrap();
 899             let s = git_root.to_str().unwrap();
 900
 901             // Bootstrap is quite bad at handling /? in front of paths
 902             let src = match s.strip_prefix("\\\\?\\") {
 903                 Some(p) => PathBuf::from(p),
 904                 None => PathBuf::from(git_root),
 905             };
 906             // If this doesn't have at least `stage0.json`, we guessed wrong. This can happen when,
 907             // for example, the build directory is inside of another unrelated git directory.
 908             // In that case keep the original `CARGO_MANIFEST_DIR` handling.
 909             //
 910             // NOTE: this implies that downloadable bootstrap isn't supported when the build directory is outside
 911             // the source directory. We could fix that by setting a variable from all three of python, ./x, and x.ps1.
 912             if src.join("src").join("stage0.json").exists() {
 913                 config.src = src;
 914             }
 915         } else {
 916             // We're building from a tarball, not git sources.
 917             // We don't support pre-downloaded bootstrap in this case.
 918         }
 919
 920         if cfg!(test) {
 921             // Use the build directory of the original x.py invocation, so that we can set `initial_rustc` properly.
 922             config.out = Path::new(
 923                 &env::var_os("CARGO_TARGET_DIR").expect("cargo test directly is not supported"),
 924             )
 925             .parent()
 926             .unwrap()
 927             .to_path_buf();
 928         }
 929
 930         let stage0_json = t!(std::fs::read(&config.src.join("src").join("stage0.json")));
 931
 932         config.stage0_metadata = t!(serde_json::from_slice::<Stage0Metadata>(&stage0_json));
 933
 934         // Read from `--config`, then `RUST_BOOTSTRAP_CONFIG`, then `./config.toml`, then `config.toml` in the root directory.
 935         let toml_path = flags
 936             .config
 937             .clone()
 938             .or_else(|| env::var_os("RUST_BOOTSTRAP_CONFIG").map(PathBuf::from));
 939         let using_default_path = toml_path.is_none();
 940         let mut toml_path = toml_path.unwrap_or_else(|| PathBuf::from("config.toml"));
 941         if using_default_path && !toml_path.exists() {
 942             toml_path = config.src.join(toml_path);
 943         }
 944
 945         // Give a hard error if `--config` or `RUST_BOOTSTRAP_CONFIG` are set to a missing path,
 946         // but not if `config.toml` hasn't been created.
 947         let mut toml = if !using_default_path || toml_path.exists() {
 948             config.config = Some(toml_path.clone());
 949             get_toml(&toml_path)
 950         } else {
 951             config.config = None;
 952             TomlConfig::default()
 953         };
 954
 955         if let Some(include) = &toml.profile {
 956             let mut include_path = config.src.clone();
 957             include_path.push("src");
 958             include_path.push("bootstrap");
 959             include_path.push("defaults");
 960             include_path.push(format!("config.{}.toml", include));
 961             let included_toml = get_toml(&include_path);
 962             toml.merge(included_toml);
 963         }
 964
 965         config.changelog_seen = toml.changelog_seen;
 966
 967         let build = toml.build.unwrap_or_default();
 968         if let Some(file_build) = build.build {
 969             config.build = TargetSelection::from_user(&file_build);
 970         };
 971
 972         set(&mut config.out, flags.build_dir.or_else(|| build.build_dir.map(PathBuf::from)));
 973         // NOTE: Bootstrap spawns various commands with different working directories.
 974         // To avoid writing to random places on the file system, `config.out` needs to be an absolute path.
 975         if !config.out.is_absolute() {
 976             // `canonicalize` requires the path to already exist. Use our vendored copy of `absolute` instead.
 977             config.out = crate::util::absolute(&config.out);
 978         }
 979
 980         config.initial_rustc = build
 981             .rustc
 982             .map(PathBuf::from)
 983             .unwrap_or_else(|| config.out.join(config.build.triple).join("stage0/bin/rustc"));
 984         config.initial_cargo = build
 985             .cargo
 986             .map(PathBuf::from)
 987             .unwrap_or_else(|| config.out.join(config.build.triple).join("stage0/bin/cargo"));
 988
 989         // NOTE: it's important this comes *after* we set `initial_rustc` just above.
 990         if config.dry_run() {
 991             let dir = config.out.join("tmp-dry-run");
 992             t!(fs::create_dir_all(&dir));
 993             config.out = dir;
 994         }
 995
 996         config.hosts = if let Some(arg_host) = flags.host {
 997             arg_host
 998         } else if let Some(file_host) = build.host {
 999             file_host.iter().map(|h| TargetSelection::from_user(h)).collect()
1000         } else {
1001             vec![config.build]
1002         };
1003         config.targets = if let Some(arg_target) = flags.target {
1004             arg_target
1005         } else if let Some(file_target) = build.target {
1006             file_target.iter().map(|h| TargetSelection::from_user(h)).collect()
1007         } else {
1008             // If target is *not* configured, then default to the host
1009             // toolchains.
1010             config.hosts.clone()
1011         };
1012
1013         config.nodejs = build.nodejs.map(PathBuf::from);
1014         config.npm = build.npm.map(PathBuf::from);
1015         config.gdb = build.gdb.map(PathBuf::from);
1016         config.python = build.python.map(PathBuf::from);
1017         config.reuse = build.reuse.map(PathBuf::from);
1018         config.submodules = build.submodules;
1019         set(&mut config.low_priority, build.low_priority);
1020         set(&mut config.compiler_docs, build.compiler_docs);
1021         set(&mut config.docs_minification, build.docs_minification);
1022         set(&mut config.docs, build.docs);
1023         set(&mut config.locked_deps, build.locked_deps);
1024         set(&mut config.vendor, build.vendor);
1025         set(&mut config.full_bootstrap, build.full_bootstrap);
1026         set(&mut config.extended, build.extended);
1027         config.tools = build.tools;
1028         set(&mut config.verbose, build.verbose);
1029         set(&mut config.sanitizers, build.sanitizers);
1030         set(&mut config.profiler, build.profiler);
1031         set(&mut config.cargo_native_static, build.cargo_native_static);
1032         set(&mut config.configure_args, build.configure_args);
1033         set(&mut config.local_rebuild, build.local_rebuild);
1034         set(&mut config.print_step_timings, build.print_step_timings);
1035         set(&mut config.print_step_rusage, build.print_step_rusage);
1036         set(&mut config.patch_binaries_for_nix, build.patch_binaries_for_nix);
1037
1038         config.verbose = cmp::max(config.verbose, flags.verbose);
1039
1040         if let Some(install) = toml.install {
1041             config.prefix = install.prefix.map(PathBuf::from);
1042             config.sysconfdir = install.sysconfdir.map(PathBuf::from);
1043             config.datadir = install.datadir.map(PathBuf::from);
1044             config.docdir = install.docdir.map(PathBuf::from);
1045             set(&mut config.bindir, install.bindir.map(PathBuf::from));
1046             config.libdir = install.libdir.map(PathBuf::from);
1047             config.mandir = install.mandir.map(PathBuf::from);
1048         }
1049
1050         // We want the llvm-skip-rebuild flag to take precedence over the
1051         // skip-rebuild config.toml option so we store it separately
1052         // so that we can infer the right value
1053         let mut llvm_skip_rebuild = flags.llvm_skip_rebuild;
1054
1055         // Store off these values as options because if they're not provided
1056         // we'll infer default values for them later
1057         let mut llvm_assertions = None;
1058         let mut llvm_tests = None;
1059         let mut llvm_plugins = None;
1060         let mut debug = None;
1061         let mut debug_assertions = None;
1062         let mut debug_assertions_std = None;
1063         let mut overflow_checks = None;
1064         let mut overflow_checks_std = None;
1065         let mut debug_logging = None;
1066         let mut debuginfo_level = None;
1067         let mut debuginfo_level_rustc = None;
1068         let mut debuginfo_level_std = None;
1069         let mut debuginfo_level_tools = None;
1070         let mut debuginfo_level_tests = None;
1071         let mut optimize = None;
1072         let mut ignore_git = None;
1073
1074         if let Some(rust) = toml.rust {
1075             debug = rust.debug;
1076             debug_assertions = rust.debug_assertions;
1077             debug_assertions_std = rust.debug_assertions_std;
1078             overflow_checks = rust.overflow_checks;
1079             overflow_checks_std = rust.overflow_checks_std;
1080             debug_logging = rust.debug_logging;
1081             debuginfo_level = rust.debuginfo_level;
1082             debuginfo_level_rustc = rust.debuginfo_level_rustc;
1083             debuginfo_level_std = rust.debuginfo_level_std;
1084             debuginfo_level_tools = rust.debuginfo_level_tools;
1085             debuginfo_level_tests = rust.debuginfo_level_tests;
1086             config.rust_split_debuginfo = rust
1087                 .split_debuginfo
1088                 .as_deref()
1089                 .map(SplitDebuginfo::from_str)
1090                 .map(|v| v.expect("invalid value for rust.split_debuginfo"))
1091                 .unwrap_or(SplitDebuginfo::default_for_platform(&config.build.triple));
1092             optimize = rust.optimize;
1093             ignore_git = rust.ignore_git;
1094             config.rust_new_symbol_mangling = rust.new_symbol_mangling;
1095             set(&mut config.rust_optimize_tests, rust.optimize_tests);
1096             set(&mut config.codegen_tests, rust.codegen_tests);
1097             set(&mut config.rust_rpath, rust.rpath);
1098             set(&mut config.jemalloc, rust.jemalloc);
1099             set(&mut config.test_compare_mode, rust.test_compare_mode);
1100             set(&mut config.backtrace, rust.backtrace);
1101             set(&mut config.channel, rust.channel);
1102             config.description = rust.description;
1103             set(&mut config.rust_dist_src, rust.dist_src);
1104             set(&mut config.verbose_tests, rust.verbose_tests);
1105             // in the case "false" is set explicitly, do not overwrite the command line args
1106             if let Some(true) = rust.incremental {
1107                 config.incremental = true;
1108             }
1109             set(&mut config.use_lld, rust.use_lld);
1110             set(&mut config.lld_enabled, rust.lld);
1111             set(&mut config.llvm_tools_enabled, rust.llvm_tools);
1112             config.rustc_parallel = rust.parallel_compiler.unwrap_or(false);
1113             config.rustc_default_linker = rust.default_linker;
1114             config.musl_root = rust.musl_root.map(PathBuf::from);
1115             config.save_toolstates = rust.save_toolstates.map(PathBuf::from);
1116             set(&mut config.deny_warnings, flags.deny_warnings.or(rust.deny_warnings));
1117             set(&mut config.backtrace_on_ice, rust.backtrace_on_ice);
1118             set(&mut config.rust_verify_llvm_ir, rust.verify_llvm_ir);
1119             config.rust_thin_lto_import_instr_limit = rust.thin_lto_import_instr_limit;
1120             set(&mut config.rust_remap_debuginfo, rust.remap_debuginfo);
1121             set(&mut config.control_flow_guard, rust.control_flow_guard);
1122             config.llvm_libunwind_default = rust
1123                 .llvm_libunwind
1124                 .map(|v| v.parse().expect("failed to parse rust.llvm-libunwind"));
1125
1126             if let Some(ref backends) = rust.codegen_backends {
1127                 config.rust_codegen_backends =
1128                     backends.iter().map(|s| INTERNER.intern_str(s)).collect();
1129             }
1130
1131             config.rust_codegen_units = rust.codegen_units.map(threads_from_config);
1132             config.rust_codegen_units_std = rust.codegen_units_std.map(threads_from_config);
1133             config.rust_profile_use = flags.rust_profile_use.or(rust.profile_use);
1134             config.rust_profile_generate = flags.rust_profile_generate.or(rust.profile_generate);
1135             config.download_rustc_commit = config.download_ci_rustc_commit(rust.download_rustc);
1136
1137             config.rust_lto = rust
1138                 .lto
1139                 .as_deref()
1140                 .map(|value| RustcLto::from_str(value).unwrap())
1141                 .unwrap_or_default();
1142         } else {
1143             config.rust_profile_use = flags.rust_profile_use;
1144             config.rust_profile_generate = flags.rust_profile_generate;
1145         }
1146
1147         if let Some(llvm) = toml.llvm {
1148             match llvm.ccache {
1149                 Some(StringOrBool::String(ref s)) => config.ccache = Some(s.to_string()),
1150                 Some(StringOrBool::Bool(true)) => {
1151                     config.ccache = Some("ccache".to_string());
1152                 }
1153                 Some(StringOrBool::Bool(false)) | None => {}
1154             }
1155             set(&mut config.ninja_in_file, llvm.ninja);
1156             llvm_assertions = llvm.assertions;
1157             llvm_tests = llvm.tests;
1158             llvm_plugins = llvm.plugins;
1159             llvm_skip_rebuild = llvm_skip_rebuild.or(llvm.skip_rebuild);
1160             set(&mut config.llvm_optimize, llvm.optimize);
1161             set(&mut config.llvm_thin_lto, llvm.thin_lto);
1162             set(&mut config.llvm_release_debuginfo, llvm.release_debuginfo);
1163             set(&mut config.llvm_version_check, llvm.version_check);
1164             set(&mut config.llvm_static_stdcpp, llvm.static_libstdcpp);
1165             if let Some(v) = llvm.link_shared {
1166                 config.llvm_link_shared.set(Some(v));
1167             }
1168             config.llvm_targets = llvm.targets.clone();
1169             config.llvm_experimental_targets = llvm.experimental_targets.clone();
1170             config.llvm_link_jobs = llvm.link_jobs;
1171             config.llvm_version_suffix = llvm.version_suffix.clone();
1172             config.llvm_clang_cl = llvm.clang_cl.clone();
1173
1174             config.llvm_cflags = llvm.cflags.clone();
1175             config.llvm_cxxflags = llvm.cxxflags.clone();
1176             config.llvm_ldflags = llvm.ldflags.clone();
1177             set(&mut config.llvm_use_libcxx, llvm.use_libcxx);
1178             config.llvm_use_linker = llvm.use_linker.clone();
1179             config.llvm_allow_old_toolchain = llvm.allow_old_toolchain.unwrap_or(false);
1180             config.llvm_polly = llvm.polly.unwrap_or(false);
1181             config.llvm_clang = llvm.clang.unwrap_or(false);
1182             config.llvm_build_config = llvm.build_config.clone().unwrap_or(Default::default());
1183
1184             let asserts = llvm_assertions.unwrap_or(false);
1185             config.llvm_from_ci = match llvm.download_ci_llvm {
1186                 Some(StringOrBool::String(s)) => {
1187                     assert!(s == "if-available", "unknown option `{}` for download-ci-llvm", s);
1188                     crate::native::is_ci_llvm_available(&config, asserts)
1189                 }
1190                 Some(StringOrBool::Bool(b)) => b,
1191                 None => {
1192                     config.channel == "dev" && crate::native::is_ci_llvm_available(&config, asserts)
1193                 }
1194             };
1195
1196             if config.llvm_from_ci {
1197                 // None of the LLVM options, except assertions, are supported
1198                 // when using downloaded LLVM. We could just ignore these but
1199                 // that's potentially confusing, so force them to not be
1200                 // explicitly set. The defaults and CI defaults don't
1201                 // necessarily match but forcing people to match (somewhat
1202                 // arbitrary) CI configuration locally seems bad/hard.
1203                 check_ci_llvm!(llvm.optimize);
1204                 check_ci_llvm!(llvm.thin_lto);
1205                 check_ci_llvm!(llvm.release_debuginfo);
1206                 // CI-built LLVM can be either dynamic or static. We won't know until we download it.
1207                 check_ci_llvm!(llvm.link_shared);
1208                 check_ci_llvm!(llvm.static_libstdcpp);
1209                 check_ci_llvm!(llvm.targets);
1210                 check_ci_llvm!(llvm.experimental_targets);
1211                 check_ci_llvm!(llvm.link_jobs);
1212                 check_ci_llvm!(llvm.clang_cl);
1213                 check_ci_llvm!(llvm.version_suffix);
1214                 check_ci_llvm!(llvm.cflags);
1215                 check_ci_llvm!(llvm.cxxflags);
1216                 check_ci_llvm!(llvm.ldflags);
1217                 check_ci_llvm!(llvm.use_libcxx);
1218                 check_ci_llvm!(llvm.use_linker);
1219                 check_ci_llvm!(llvm.allow_old_toolchain);
1220                 check_ci_llvm!(llvm.polly);
1221                 check_ci_llvm!(llvm.clang);
1222                 check_ci_llvm!(llvm.build_config);
1223                 check_ci_llvm!(llvm.plugins);
1224             }
1225
1226             // NOTE: can never be hit when downloading from CI, since we call `check_ci_llvm!(thin_lto)` above.
1227             if config.llvm_thin_lto && llvm.link_shared.is_none() {
1228                 // If we're building with ThinLTO on, by default we want to link
1229                 // to LLVM shared, to avoid re-doing ThinLTO (which happens in
1230                 // the link step) with each stage.
1231                 config.llvm_link_shared.set(Some(true));
1232             }
1233         } else {
1234             config.llvm_from_ci =
1235                 config.channel == "dev" && crate::native::is_ci_llvm_available(&config, false);
1236         }
1237
1238         if let Some(t) = toml.target {
1239             for (triple, cfg) in t {
1240                 let mut target = Target::from_triple(&triple);
1241
1242                 if let Some(ref s) = cfg.llvm_config {
1243                     target.llvm_config = Some(config.src.join(s));
1244                 }
1245                 target.llvm_has_rust_patches = cfg.llvm_has_rust_patches;
1246                 if let Some(ref s) = cfg.llvm_filecheck {
1247                     target.llvm_filecheck = Some(config.src.join(s));
1248                 }
1249                 target.llvm_libunwind = cfg
1250                     .llvm_libunwind
1251                     .as_ref()
1252                     .map(|v| v.parse().expect("failed to parse rust.llvm-libunwind"));
1253                 if let Some(ref s) = cfg.android_ndk {
1254                     target.ndk = Some(config.src.join(s));
1255                 }
1256                 if let Some(s) = cfg.no_std {
1257                     target.no_std = s;
1258                 }
1259                 target.cc = cfg.cc.map(PathBuf::from).or_else(|| {
1260                     target.ndk.as_ref().map(|ndk| ndk_compiler(Language::C, &triple, ndk))
1261                 });
1262                 target.cxx = cfg.cxx.map(PathBuf::from).or_else(|| {
1263                     target.ndk.as_ref().map(|ndk| ndk_compiler(Language::CPlusPlus, &triple, ndk))
1264                 });
1265                 target.ar = cfg.ar.map(PathBuf::from);
1266                 target.ranlib = cfg.ranlib.map(PathBuf::from);
1267                 target.linker = cfg.linker.map(PathBuf::from);
1268                 target.crt_static = cfg.crt_static;
1269                 target.musl_root = cfg.musl_root.map(PathBuf::from);
1270                 target.musl_libdir = cfg.musl_libdir.map(PathBuf::from);
1271                 target.wasi_root = cfg.wasi_root.map(PathBuf::from);
1272                 target.qemu_rootfs = cfg.qemu_rootfs.map(PathBuf::from);
1273                 target.sanitizers = cfg.sanitizers;
1274                 target.profiler = cfg.profiler;
1275
1276                 config.target_config.insert(TargetSelection::from_user(&triple), target);
1277             }
1278         }
1279
1280         if config.llvm_from_ci {
1281             let triple = &config.build.triple;
1282             let ci_llvm_bin = config.ci_llvm_root().join("bin");
1283             let mut build_target = config
1284                 .target_config
1285                 .entry(config.build)
1286                 .or_insert_with(|| Target::from_triple(&triple));
1287
1288             check_ci_llvm!(build_target.llvm_config);
1289             check_ci_llvm!(build_target.llvm_filecheck);
1290             build_target.llvm_config = Some(ci_llvm_bin.join(exe("llvm-config", config.build)));
1291             build_target.llvm_filecheck = Some(ci_llvm_bin.join(exe("FileCheck", config.build)));
1292         }
1293
1294         if let Some(t) = toml.dist {
1295             config.dist_sign_folder = t.sign_folder.map(PathBuf::from);
1296             config.dist_upload_addr = t.upload_addr;
1297             config.dist_compression_formats = t.compression_formats;
1298             set(&mut config.rust_dist_src, t.src_tarball);
1299             set(&mut config.missing_tools, t.missing_tools);
1300         }
1301
1302         if let Some(r) = build.rustfmt {
1303             *config.initial_rustfmt.borrow_mut() = if r.exists() {
1304                 RustfmtState::SystemToolchain(r)
1305             } else {
1306                 RustfmtState::Unavailable
1307             };
1308         } else {
1309             // If using a system toolchain for bootstrapping, see if that has rustfmt available.
1310             let host = config.build;
1311             let rustfmt_path = config.initial_rustc.with_file_name(exe("rustfmt", host));
1312             let bin_root = config.out.join(host.triple).join("stage0");
1313             if !rustfmt_path.starts_with(&bin_root) {
1314                 // Using a system-provided toolchain; we shouldn't download rustfmt.
1315                 *config.initial_rustfmt.borrow_mut() = RustfmtState::SystemToolchain(rustfmt_path);
1316             }
1317         }
1318
1319         // Now that we've reached the end of our configuration, infer the
1320         // default values for all options that we haven't otherwise stored yet.
1321
1322         config.llvm_skip_rebuild = llvm_skip_rebuild.unwrap_or(false);
1323         config.llvm_assertions = llvm_assertions.unwrap_or(false);
1324         config.llvm_tests = llvm_tests.unwrap_or(false);
1325         config.llvm_plugins = llvm_plugins.unwrap_or(false);
1326         config.rust_optimize = optimize.unwrap_or(true);
1327
1328         let default = debug == Some(true);
1329         config.rust_debug_assertions = debug_assertions.unwrap_or(default);
1330         config.rust_debug_assertions_std =
1331             debug_assertions_std.unwrap_or(config.rust_debug_assertions);
1332         config.rust_overflow_checks = overflow_checks.unwrap_or(default);
1333         config.rust_overflow_checks_std =
1334             overflow_checks_std.unwrap_or(config.rust_overflow_checks);
1335
1336         config.rust_debug_logging = debug_logging.unwrap_or(config.rust_debug_assertions);
1337
1338         let with_defaults = |debuginfo_level_specific: Option<u32>| {
1339             debuginfo_level_specific.or(debuginfo_level).unwrap_or(if debug == Some(true) {
1340                 1
1341             } else {
1342                 0
1343             })
1344         };
1345         config.rust_debuginfo_level_rustc = with_defaults(debuginfo_level_rustc);
1346         config.rust_debuginfo_level_std = with_defaults(debuginfo_level_std);
1347         config.rust_debuginfo_level_tools = with_defaults(debuginfo_level_tools);
1348         config.rust_debuginfo_level_tests = debuginfo_level_tests.unwrap_or(0);
1349
1350         let default = config.channel == "dev";
1351         config.ignore_git = ignore_git.unwrap_or(default);
1352         config.rust_info = GitInfo::new(config.ignore_git, &config.src);
1353
1354         let download_rustc = config.download_rustc_commit.is_some();
1355         // See https://github.com/rust-lang/compiler-team/issues/326
1356         config.stage = match config.cmd {
1357             Subcommand::Check { .. } => flags.stage.or(build.check_stage).unwrap_or(0),
1358             // `download-rustc` only has a speed-up for stage2 builds. Default to stage2 unless explicitly overridden.
1359             Subcommand::Doc { .. } => {
1360                 flags.stage.or(build.doc_stage).unwrap_or(if download_rustc { 2 } else { 0 })
1361             }
1362             Subcommand::Build { .. } => {
1363                 flags.stage.or(build.build_stage).unwrap_or(if download_rustc { 2 } else { 1 })
1364             }
1365             Subcommand::Test { .. } => {
1366                 flags.stage.or(build.test_stage).unwrap_or(if download_rustc { 2 } else { 1 })
1367             }
1368             Subcommand::Bench { .. } => flags.stage.or(build.bench_stage).unwrap_or(2),
1369             Subcommand::Dist { .. } => flags.stage.or(build.dist_stage).unwrap_or(2),
1370             Subcommand::Install { .. } => flags.stage.or(build.install_stage).unwrap_or(2),
1371             // These are all bootstrap tools, which don't depend on the compiler.
1372             // The stage we pass shouldn't matter, but use 0 just in case.
1373             Subcommand::Clean { .. }
1374             | Subcommand::Clippy { .. }
1375             | Subcommand::Fix { .. }
1376             | Subcommand::Run { .. }
1377             | Subcommand::Setup { .. }
1378             | Subcommand::Format { .. } => flags.stage.unwrap_or(0),
1379         };
1380
1381         // CI should always run stage 2 builds, unless it specifically states otherwise
1382         #[cfg(not(test))]
1383         if flags.stage.is_none() && crate::CiEnv::current() != crate::CiEnv::None {
1384             match config.cmd {
1385                 Subcommand::Test { .. }
1386                 | Subcommand::Doc { .. }
1387                 | Subcommand::Build { .. }
1388                 | Subcommand::Bench { .. }
1389                 | Subcommand::Dist { .. }
1390                 | Subcommand::Install { .. } => {
1391                     assert_eq!(
1392                         config.stage, 2,
1393                         "x.py should be run with `--stage 2` on CI, but was run with `--stage {}`",
1394                         config.stage,
1395                     );
1396                 }
1397                 Subcommand::Clean { .. }
1398                 | Subcommand::Check { .. }
1399                 | Subcommand::Clippy { .. }
1400                 | Subcommand::Fix { .. }
1401                 | Subcommand::Run { .. }
1402                 | Subcommand::Setup { .. }
1403                 | Subcommand::Format { .. } => {}
1404             }
1405         }
1406
1407         config
1408     }
1409
1410     pub(crate) fn dry_run(&self) -> bool {
1411         match self.dry_run {
1412             DryRun::Disabled => false,
1413             DryRun::SelfCheck | DryRun::UserSelected => true,
1414         }
1415     }
1416
1417     /// A git invocation which runs inside the source directory.
1418     ///
1419     /// Use this rather than `Command::new("git")` in order to support out-of-tree builds.
1420     pub(crate) fn git(&self) -> Command {
1421         let mut git = Command::new("git");
1422         git.current_dir(&self.src);
1423         git
1424     }
1425
1426     /// Bootstrap embeds a version number into the name of shared libraries it uploads in CI.
1427     /// Return the version it would have used for the given commit.
1428     pub(crate) fn artifact_version_part(&self, commit: &str) -> String {
1429         let (channel, version) = if self.rust_info.is_managed_git_subrepository() {
1430             let mut channel = self.git();
1431             channel.arg("show").arg(format!("{}:src/ci/channel", commit));
1432             let channel = output(&mut channel);
1433             let mut version = self.git();
1434             version.arg("show").arg(format!("{}:src/version", commit));
1435             let version = output(&mut version);
1436             (channel.trim().to_owned(), version.trim().to_owned())
1437         } else {
1438             let channel = fs::read_to_string(self.src.join("src/ci/channel"));
1439             let version = fs::read_to_string(self.src.join("src/version"));
1440             match (channel, version) {
1441                 (Ok(channel), Ok(version)) => {
1442                     (channel.trim().to_owned(), version.trim().to_owned())
1443                 }
1444                 (channel, version) => {
1445                     let src = self.src.display();
1446                     eprintln!("error: failed to determine artifact channel and/or version");
1447                     eprintln!(
1448                         "help: consider using a git checkout or ensure these files are readable"
1449                     );
1450                     if let Err(channel) = channel {
1451                         eprintln!("reading {}/src/ci/channel failed: {:?}", src, channel);
1452                     }
1453                     if let Err(version) = version {
1454                         eprintln!("reading {}/src/version failed: {:?}", src, version);
1455                     }
1456                     panic!();
1457                 }
1458             }
1459         };
1460
1461         match channel.as_str() {
1462             "stable" => version,
1463             "beta" => channel,
1464             "nightly" => channel,
1465             other => unreachable!("{:?} is not recognized as a valid channel", other),
1466         }
1467     }
1468
1469     /// Try to find the relative path of `bindir`, otherwise return it in full.
1470     pub fn bindir_relative(&self) -> &Path {
1471         let bindir = &self.bindir;
1472         if bindir.is_absolute() {
1473             // Try to make it relative to the prefix.
1474             if let Some(prefix) = &self.prefix {
1475                 if let Ok(stripped) = bindir.strip_prefix(prefix) {
1476                     return stripped;
1477                 }
1478             }
1479         }
1480         bindir
1481     }
1482
1483     /// Try to find the relative path of `libdir`.
1484     pub fn libdir_relative(&self) -> Option<&Path> {
1485         let libdir = self.libdir.as_ref()?;
1486         if libdir.is_relative() {
1487             Some(libdir)
1488         } else {
1489             // Try to make it relative to the prefix.
1490             libdir.strip_prefix(self.prefix.as_ref()?).ok()
1491         }
1492     }
1493
1494     /// The absolute path to the downloaded LLVM artifacts.
1495     pub(crate) fn ci_llvm_root(&self) -> PathBuf {
1496         assert!(self.llvm_from_ci);
1497         self.out.join(&*self.build.triple).join("ci-llvm")
1498     }
1499
1500     /// Determine whether llvm should be linked dynamically.
1501     ///
1502     /// If `false`, llvm should be linked statically.
1503     /// This is computed on demand since LLVM might have to first be downloaded from CI.
1504     pub(crate) fn llvm_link_shared(&self) -> bool {
1505         let mut opt = self.llvm_link_shared.get();
1506         if opt.is_none() && self.dry_run() {
1507             // just assume static for now - dynamic linking isn't supported on all platforms
1508             return false;
1509         }
1510
1511         let llvm_link_shared = *opt.get_or_insert_with(|| {
1512             if self.llvm_from_ci {
1513                 self.maybe_download_ci_llvm();
1514                 let ci_llvm = self.ci_llvm_root();
1515                 let link_type = t!(
1516                     std::fs::read_to_string(ci_llvm.join("link-type.txt")),
1517                     format!("CI llvm missing: {}", ci_llvm.display())
1518                 );
1519                 link_type == "dynamic"
1520             } else {
1521                 // unclear how thought-through this default is, but it maintains compatibility with
1522                 // previous behavior
1523                 false
1524             }
1525         });
1526         self.llvm_link_shared.set(opt);
1527         llvm_link_shared
1528     }
1529
1530     /// Return whether we will use a downloaded, pre-compiled version of rustc, or just build from source.
1531     pub(crate) fn download_rustc(&self) -> bool {
1532         self.download_rustc_commit().is_some()
1533     }
1534
1535     pub(crate) fn download_rustc_commit(&self) -> Option<&'static str> {
1536         static DOWNLOAD_RUSTC: OnceCell<Option<String>> = OnceCell::new();
1537         if self.dry_run() && DOWNLOAD_RUSTC.get().is_none() {
1538             // avoid trying to actually download the commit
1539             return None;
1540         }
1541
1542         DOWNLOAD_RUSTC
1543             .get_or_init(|| match &self.download_rustc_commit {
1544                 None => None,
1545                 Some(commit) => {
1546                     self.download_ci_rustc(commit);
1547                     Some(commit.clone())
1548                 }
1549             })
1550             .as_deref()
1551     }
1552
1553     pub(crate) fn initial_rustfmt(&self) -> Option<PathBuf> {
1554         match &mut *self.initial_rustfmt.borrow_mut() {
1555             RustfmtState::SystemToolchain(p) | RustfmtState::Downloaded(p) => Some(p.clone()),
1556             RustfmtState::Unavailable => None,
1557             r @ RustfmtState::LazyEvaluated => {
1558                 if self.dry_run() {
1559                     return Some(PathBuf::new());
1560                 }
1561                 let path = self.maybe_download_rustfmt();
1562                 *r = if let Some(p) = &path {
1563                     RustfmtState::Downloaded(p.clone())
1564                 } else {
1565                     RustfmtState::Unavailable
1566                 };
1567                 path
1568             }
1569         }
1570     }
1571
1572     pub fn verbose(&self, msg: &str) {
1573         if self.verbose > 0 {
1574             println!("{}", msg);
1575         }
1576     }
1577
1578     pub fn sanitizers_enabled(&self, target: TargetSelection) -> bool {
1579         self.target_config.get(&target).map(|t| t.sanitizers).flatten().unwrap_or(self.sanitizers)
1580     }
1581
1582     pub fn any_sanitizers_enabled(&self) -> bool {
1583         self.target_config.values().any(|t| t.sanitizers == Some(true)) || self.sanitizers
1584     }
1585
1586     pub fn profiler_enabled(&self, target: TargetSelection) -> bool {
1587         self.target_config.get(&target).map(|t| t.profiler).flatten().unwrap_or(self.profiler)
1588     }
1589
1590     pub fn any_profiler_enabled(&self) -> bool {
1591         self.target_config.values().any(|t| t.profiler == Some(true)) || self.profiler
1592     }
1593
1594     pub fn llvm_enabled(&self) -> bool {
1595         self.rust_codegen_backends.contains(&INTERNER.intern_str("llvm"))
1596     }
1597
1598     pub fn llvm_libunwind(&self, target: TargetSelection) -> LlvmLibunwind {
1599         self.target_config
1600             .get(&target)
1601             .and_then(|t| t.llvm_libunwind)
1602             .or(self.llvm_libunwind_default)
1603             .unwrap_or(if target.contains("fuchsia") {
1604                 LlvmLibunwind::InTree
1605             } else {
1606                 LlvmLibunwind::No
1607             })
1608     }
1609
1610     pub fn submodules(&self, rust_info: &GitInfo) -> bool {
1611         self.submodules.unwrap_or(rust_info.is_managed_git_subrepository())
1612     }
1613
1614     pub fn default_codegen_backend(&self) -> Option<Interned<String>> {
1615         self.rust_codegen_backends.get(0).cloned()
1616     }
1617
1618     /// Returns the commit to download, or `None` if we shouldn't download CI artifacts.
1619     fn download_ci_rustc_commit(&self, download_rustc: Option<StringOrBool>) -> Option<String> {
1620         // If `download-rustc` is not set, default to rebuilding.
1621         let if_unchanged = match download_rustc {
1622             None | Some(StringOrBool::Bool(false)) => return None,
1623             Some(StringOrBool::Bool(true)) => false,
1624             Some(StringOrBool::String(s)) if s == "if-unchanged" => true,
1625             Some(StringOrBool::String(other)) => {
1626                 panic!("unrecognized option for download-rustc: {}", other)
1627             }
1628         };
1629
1630         // Handle running from a directory other than the top level
1631         let top_level = output(self.git().args(&["rev-parse", "--show-toplevel"]));
1632         let top_level = top_level.trim_end();
1633         let compiler = format!("{top_level}/compiler/");
1634         let library = format!("{top_level}/library/");
1635
1636         // Look for a version to compare to based on the current commit.
1637         // Only commits merged by bors will have CI artifacts.
1638         let merge_base = output(
1639             self.git()
1640                 .arg("rev-list")
1641                 .arg(format!("--author={}", self.stage0_metadata.config.git_merge_commit_email))
1642                 .args(&["-n1", "--first-parent", "HEAD"]),
1643         );
1644         let commit = merge_base.trim_end();
1645         if commit.is_empty() {
1646             println!("error: could not find commit hash for downloading rustc");
1647             println!("help: maybe your repository history is too shallow?");
1648             println!("help: consider disabling `download-rustc`");
1649             println!("help: or fetch enough history to include one upstream commit");
1650             crate::detail_exit(1);
1651         }
1652
1653         // Warn if there were changes to the compiler or standard library since the ancestor commit.
1654         let has_changes = !t!(self
1655             .git()
1656             .args(&["diff-index", "--quiet", &commit, "--", &compiler, &library])
1657             .status())
1658         .success();
1659         if has_changes {
1660             if if_unchanged {
1661                 if self.verbose > 0 {
1662                     println!(
1663                         "warning: saw changes to compiler/ or library/ since {commit}; \
1664                             ignoring `download-rustc`"
1665                     );
1666                 }
1667                 return None;
1668             }
1669             println!(
1670                 "warning: `download-rustc` is enabled, but there are changes to \
1671                     compiler/ or library/"
1672             );
1673         }
1674
1675         Some(commit.to_string())
1676     }
1677 }
1678
1679 fn set<T>(field: &mut T, val: Option<T>) {
1680     if let Some(v) = val {
1681         *field = v;
1682     }
1683 }
1684
1685 fn threads_from_config(v: u32) -> u32 {
1686     match v {
1687         0 => std::thread::available_parallelism().map_or(1, std::num::NonZeroUsize::get) as u32,
1688         n => n,
1689     }
1690 }