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 use std::cmp;
   7 use std::collections::{HashMap, HashSet};
   8 use std::env;
   9 use std::ffi::OsString;
  10 use std::fmt;
  11 use std::fs;
  12 use std::path::{Path, PathBuf};
  13 use std::str::FromStr;
  14
  15 use crate::builder::TaskPath;
  16 use crate::cache::{Interned, INTERNER};
  17 use crate::channel::GitInfo;
  18 pub use crate::flags::Subcommand;
  19 use crate::flags::{Color, Flags};
  20 use crate::util::exe;
  21 use build_helper::t;
  22 use serde::Deserialize;
  23
  24 macro_rules! check_ci_llvm {
  25     ($name:expr) => {
  26         assert!(
  27             $name.is_none(),
  28             "setting {} is incompatible with download-ci-llvm.",
  29             stringify!($name)
  30         );
  31     };
  32 }
  33
  34 /// Global configuration for the entire build and/or bootstrap.
  35 ///
  36 /// This structure is derived from a combination of both `config.toml` and
  37 /// `config.mk`. As of the time of this writing it's unlikely that `config.toml`
  38 /// is used all that much, so this is primarily filled out by `config.mk` which
  39 /// is generated from `./configure`.
  40 ///
  41 /// Note that this structure is not decoded directly into, but rather it is
  42 /// filled out from the decoded forms of the structs below. For documentation
  43 /// each field, see the corresponding fields in
  44 /// `config.toml.example`.
  45 #[derive(Default)]
  46 pub struct Config {
  47     pub changelog_seen: Option<usize>,
  48     pub ccache: Option<String>,
  49     /// Call Build::ninja() instead of this.
  50     pub ninja_in_file: bool,
  51     pub verbose: usize,
  52     pub submodules: Option<bool>,
  53     pub fast_submodules: bool,
  54     pub compiler_docs: bool,
  55     pub docs_minification: bool,
  56     pub docs: bool,
  57     pub locked_deps: bool,
  58     pub vendor: bool,
  59     pub target_config: HashMap<TargetSelection, Target>,
  60     pub full_bootstrap: bool,
  61     pub extended: bool,
  62     pub tools: Option<HashSet<String>>,
  63     pub sanitizers: bool,
  64     pub profiler: bool,
  65     pub ignore_git: bool,
  66     pub exclude: Vec<TaskPath>,
  67     pub include_default_paths: bool,
  68     pub rustc_error_format: Option<String>,
  69     pub json_output: bool,
  70     pub test_compare_mode: bool,
  71     pub llvm_libunwind: LlvmLibunwind,
  72     pub color: Color,
  73
  74     pub on_fail: Option<String>,
  75     pub stage: u32,
  76     pub keep_stage: Vec<u32>,
  77     pub keep_stage_std: Vec<u32>,
  78     pub src: PathBuf,
  79     // defaults to `config.toml`
  80     pub config: PathBuf,
  81     pub jobs: Option<u32>,
  82     pub cmd: Subcommand,
  83     pub incremental: bool,
  84     pub dry_run: bool,
  85     pub download_rustc: bool,
  86
  87     pub deny_warnings: bool,
  88     pub backtrace_on_ice: bool,
  89
  90     // llvm codegen options
  91     pub llvm_skip_rebuild: bool,
  92     pub llvm_assertions: bool,
  93     pub llvm_tests: bool,
  94     pub llvm_plugins: bool,
  95     pub llvm_optimize: bool,
  96     pub llvm_thin_lto: bool,
  97     pub llvm_release_debuginfo: bool,
  98     pub llvm_version_check: bool,
  99     pub llvm_static_stdcpp: bool,
 100     pub llvm_link_shared: bool,
 101     pub llvm_clang_cl: Option<String>,
 102     pub llvm_targets: Option<String>,
 103     pub llvm_experimental_targets: Option<String>,
 104     pub llvm_link_jobs: Option<u32>,
 105     pub llvm_version_suffix: Option<String>,
 106     pub llvm_use_linker: Option<String>,
 107     pub llvm_allow_old_toolchain: bool,
 108     pub llvm_polly: bool,
 109     pub llvm_clang: bool,
 110     pub llvm_from_ci: bool,
 111
 112     pub use_lld: bool,
 113     pub lld_enabled: bool,
 114     pub llvm_tools_enabled: bool,
 115
 116     pub llvm_cflags: Option<String>,
 117     pub llvm_cxxflags: Option<String>,
 118     pub llvm_ldflags: Option<String>,
 119     pub llvm_use_libcxx: bool,
 120
 121     // rust codegen options
 122     pub rust_optimize: bool,
 123     pub rust_codegen_units: Option<u32>,
 124     pub rust_codegen_units_std: Option<u32>,
 125     pub rust_debug_assertions: bool,
 126     pub rust_debug_assertions_std: bool,
 127     pub rust_overflow_checks: bool,
 128     pub rust_overflow_checks_std: bool,
 129     pub rust_debug_logging: bool,
 130     pub rust_debuginfo_level_rustc: u32,
 131     pub rust_debuginfo_level_std: u32,
 132     pub rust_debuginfo_level_tools: u32,
 133     pub rust_debuginfo_level_tests: u32,
 134     pub rust_run_dsymutil: bool,
 135     pub rust_rpath: bool,
 136     pub rustc_parallel: bool,
 137     pub rustc_default_linker: Option<String>,
 138     pub rust_optimize_tests: bool,
 139     pub rust_dist_src: bool,
 140     pub rust_codegen_backends: Vec<Interned<String>>,
 141     pub rust_verify_llvm_ir: bool,
 142     pub rust_thin_lto_import_instr_limit: Option<u32>,
 143     pub rust_remap_debuginfo: bool,
 144     pub rust_new_symbol_mangling: Option<bool>,
 145     pub rust_profile_use: Option<String>,
 146     pub rust_profile_generate: Option<String>,
 147     pub llvm_profile_use: Option<String>,
 148     pub llvm_profile_generate: bool,
 149
 150     pub build: TargetSelection,
 151     pub hosts: Vec<TargetSelection>,
 152     pub targets: Vec<TargetSelection>,
 153     pub local_rebuild: bool,
 154     pub jemalloc: bool,
 155     pub control_flow_guard: bool,
 156
 157     // dist misc
 158     pub dist_sign_folder: Option<PathBuf>,
 159     pub dist_upload_addr: Option<String>,
 160     pub dist_compression_formats: Option<Vec<String>>,
 161
 162     // libstd features
 163     pub backtrace: bool, // support for RUST_BACKTRACE
 164
 165     // misc
 166     pub low_priority: bool,
 167     pub channel: String,
 168     pub description: Option<String>,
 169     pub verbose_tests: bool,
 170     pub save_toolstates: Option<PathBuf>,
 171     pub print_step_timings: bool,
 172     pub print_step_rusage: bool,
 173     pub missing_tools: bool,
 174
 175     // Fallback musl-root for all targets
 176     pub musl_root: Option<PathBuf>,
 177     pub prefix: Option<PathBuf>,
 178     pub sysconfdir: Option<PathBuf>,
 179     pub datadir: Option<PathBuf>,
 180     pub docdir: Option<PathBuf>,
 181     pub bindir: PathBuf,
 182     pub libdir: Option<PathBuf>,
 183     pub mandir: Option<PathBuf>,
 184     pub codegen_tests: bool,
 185     pub nodejs: Option<PathBuf>,
 186     pub npm: Option<PathBuf>,
 187     pub gdb: Option<PathBuf>,
 188     pub python: Option<PathBuf>,
 189     pub cargo_native_static: bool,
 190     pub configure_args: Vec<String>,
 191
 192     // These are either the stage0 downloaded binaries or the locally installed ones.
 193     pub initial_cargo: PathBuf,
 194     pub initial_rustc: PathBuf,
 195     pub initial_rustfmt: Option<PathBuf>,
 196     pub out: PathBuf,
 197 }
 198
 199 #[derive(Debug, Clone, Copy, PartialEq)]
 200 pub enum LlvmLibunwind {
 201     No,
 202     InTree,
 203     System,
 204 }
 205
 206 impl Default for LlvmLibunwind {
 207     fn default() -> Self {
 208         Self::No
 209     }
 210 }
 211
 212 impl FromStr for LlvmLibunwind {
 213     type Err = String;
 214
 215     fn from_str(value: &str) -> Result<Self, Self::Err> {
 216         match value {
 217             "no" => Ok(Self::No),
 218             "in-tree" => Ok(Self::InTree),
 219             "system" => Ok(Self::System),
 220             invalid => Err(format!("Invalid value '{}' for rust.llvm-libunwind config.", invalid)),
 221         }
 222     }
 223 }
 224
 225 #[derive(Debug, Copy, Clone, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
 226 pub struct TargetSelection {
 227     pub triple: Interned<String>,
 228     file: Option<Interned<String>>,
 229 }
 230
 231 impl TargetSelection {
 232     pub fn from_user(selection: &str) -> Self {
 233         let path = Path::new(selection);
 234
 235         let (triple, file) = if path.exists() {
 236             let triple = path
 237                 .file_stem()
 238                 .expect("Target specification file has no file stem")
 239                 .to_str()
 240                 .expect("Target specification file stem is not UTF-8");
 241
 242             (triple, Some(selection))
 243         } else {
 244             (selection, None)
 245         };
 246
 247         let triple = INTERNER.intern_str(triple);
 248         let file = file.map(|f| INTERNER.intern_str(f));
 249
 250         Self { triple, file }
 251     }
 252
 253     pub fn rustc_target_arg(&self) -> &str {
 254         self.file.as_ref().unwrap_or(&self.triple)
 255     }
 256
 257     pub fn contains(&self, needle: &str) -> bool {
 258         self.triple.contains(needle)
 259     }
 260
 261     pub fn starts_with(&self, needle: &str) -> bool {
 262         self.triple.starts_with(needle)
 263     }
 264
 265     pub fn ends_with(&self, needle: &str) -> bool {
 266         self.triple.ends_with(needle)
 267     }
 268 }
 269
 270 impl fmt::Display for TargetSelection {
 271     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 272         write!(f, "{}", self.triple)?;
 273         if let Some(file) = self.file {
 274             write!(f, "({})", file)?;
 275         }
 276         Ok(())
 277     }
 278 }
 279
 280 impl PartialEq<&str> for TargetSelection {
 281     fn eq(&self, other: &&str) -> bool {
 282         self.triple == *other
 283     }
 284 }
 285
 286 /// Per-target configuration stored in the global configuration structure.
 287 #[derive(Default)]
 288 pub struct Target {
 289     /// Some(path to llvm-config) if using an external LLVM.
 290     pub llvm_config: Option<PathBuf>,
 291     /// Some(path to FileCheck) if one was specified.
 292     pub llvm_filecheck: Option<PathBuf>,
 293     pub cc: Option<PathBuf>,
 294     pub cxx: Option<PathBuf>,
 295     pub ar: Option<PathBuf>,
 296     pub ranlib: Option<PathBuf>,
 297     pub default_linker: Option<PathBuf>,
 298     pub linker: Option<PathBuf>,
 299     pub ndk: Option<PathBuf>,
 300     pub sanitizers: Option<bool>,
 301     pub profiler: Option<bool>,
 302     pub crt_static: Option<bool>,
 303     pub musl_root: Option<PathBuf>,
 304     pub musl_libdir: Option<PathBuf>,
 305     pub wasi_root: Option<PathBuf>,
 306     pub qemu_rootfs: Option<PathBuf>,
 307     pub no_std: bool,
 308 }
 309
 310 impl Target {
 311     pub fn from_triple(triple: &str) -> Self {
 312         let mut target: Self = Default::default();
 313         if triple.contains("-none") || triple.contains("nvptx") {
 314             target.no_std = true;
 315         }
 316         target
 317     }
 318 }
 319 /// Structure of the `config.toml` file that configuration is read from.
 320 ///
 321 /// This structure uses `Decodable` to automatically decode a TOML configuration
 322 /// file into this format, and then this is traversed and written into the above
 323 /// `Config` structure.
 324 #[derive(Deserialize, Default)]
 325 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 326 struct TomlConfig {
 327     changelog_seen: Option<usize>,
 328     build: Option<Build>,
 329     install: Option<Install>,
 330     llvm: Option<Llvm>,
 331     rust: Option<Rust>,
 332     target: Option<HashMap<String, TomlTarget>>,
 333     dist: Option<Dist>,
 334     profile: Option<String>,
 335 }
 336
 337 trait Merge {
 338     fn merge(&mut self, other: Self);
 339 }
 340
 341 impl Merge for TomlConfig {
 342     fn merge(
 343         &mut self,
 344         TomlConfig { build, install, llvm, rust, dist, target, profile: _, changelog_seen: _ }: Self,
 345     ) {
 346         fn do_merge<T: Merge>(x: &mut Option<T>, y: Option<T>) {
 347             if let Some(new) = y {
 348                 if let Some(original) = x {
 349                     original.merge(new);
 350                 } else {
 351                     *x = Some(new);
 352                 }
 353             }
 354         }
 355         do_merge(&mut self.build, build);
 356         do_merge(&mut self.install, install);
 357         do_merge(&mut self.llvm, llvm);
 358         do_merge(&mut self.rust, rust);
 359         do_merge(&mut self.dist, dist);
 360         assert!(target.is_none(), "merging target-specific config is not currently supported");
 361     }
 362 }
 363
 364 // We are using a decl macro instead of a derive proc macro here to reduce the compile time of
 365 // rustbuild.
 366 macro_rules! derive_merge {
 367     ($(#[$attr:meta])* struct $name:ident {
 368         $($field:ident: $field_ty:ty,)*
 369     }) => {
 370         $(#[$attr])*
 371         struct $name {
 372             $($field: $field_ty,)*
 373         }
 374
 375         impl Merge for $name {
 376             fn merge(&mut self, other: Self) {
 377                 $(
 378                     if !self.$field.is_some() {
 379                         self.$field = other.$field;
 380                     }
 381                 )*
 382             }
 383         }
 384     }
 385 }
 386
 387 derive_merge! {
 388     /// TOML representation of various global build decisions.
 389     #[derive(Deserialize, Default, Clone)]
 390     #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 391     struct Build {
 392         build: Option<String>,
 393         host: Option<Vec<String>>,
 394         target: Option<Vec<String>>,
 395         // This is ignored, the rust code always gets the build directory from the `BUILD_DIR` env variable
 396         build_dir: Option<String>,
 397         cargo: Option<String>,
 398         rustc: Option<String>,
 399         rustfmt: Option<PathBuf>,
 400         docs: Option<bool>,
 401         compiler_docs: Option<bool>,
 402         docs_minification: Option<bool>,
 403         submodules: Option<bool>,
 404         fast_submodules: Option<bool>,
 405         gdb: Option<String>,
 406         nodejs: Option<String>,
 407         npm: Option<String>,
 408         python: Option<String>,
 409         locked_deps: Option<bool>,
 410         vendor: Option<bool>,
 411         full_bootstrap: Option<bool>,
 412         extended: Option<bool>,
 413         tools: Option<HashSet<String>>,
 414         verbose: Option<usize>,
 415         sanitizers: Option<bool>,
 416         profiler: Option<bool>,
 417         cargo_native_static: Option<bool>,
 418         low_priority: Option<bool>,
 419         configure_args: Option<Vec<String>>,
 420         local_rebuild: Option<bool>,
 421         print_step_timings: Option<bool>,
 422         print_step_rusage: Option<bool>,
 423         check_stage: Option<u32>,
 424         doc_stage: Option<u32>,
 425         build_stage: Option<u32>,
 426         test_stage: Option<u32>,
 427         install_stage: Option<u32>,
 428         dist_stage: Option<u32>,
 429         bench_stage: Option<u32>,
 430         patch_binaries_for_nix: Option<bool>,
 431     }
 432 }
 433
 434 derive_merge! {
 435     /// TOML representation of various global install decisions.
 436     #[derive(Deserialize, Default, Clone)]
 437     #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 438     struct Install {
 439         prefix: Option<String>,
 440         sysconfdir: Option<String>,
 441         docdir: Option<String>,
 442         bindir: Option<String>,
 443         libdir: Option<String>,
 444         mandir: Option<String>,
 445         datadir: Option<String>,
 446     }
 447 }
 448
 449 derive_merge! {
 450     /// TOML representation of how the LLVM build is configured.
 451     #[derive(Deserialize, Default)]
 452     #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 453     struct Llvm {
 454         skip_rebuild: Option<bool>,
 455         optimize: Option<bool>,
 456         thin_lto: Option<bool>,
 457         release_debuginfo: Option<bool>,
 458         assertions: Option<bool>,
 459         tests: Option<bool>,
 460         plugins: Option<bool>,
 461         ccache: Option<StringOrBool>,
 462         version_check: Option<bool>,
 463         static_libstdcpp: Option<bool>,
 464         ninja: Option<bool>,
 465         targets: Option<String>,
 466         experimental_targets: Option<String>,
 467         link_jobs: Option<u32>,
 468         link_shared: Option<bool>,
 469         version_suffix: Option<String>,
 470         clang_cl: Option<String>,
 471         cflags: Option<String>,
 472         cxxflags: Option<String>,
 473         ldflags: Option<String>,
 474         use_libcxx: Option<bool>,
 475         use_linker: Option<String>,
 476         allow_old_toolchain: Option<bool>,
 477         polly: Option<bool>,
 478         clang: Option<bool>,
 479         download_ci_llvm: Option<StringOrBool>,
 480     }
 481 }
 482
 483 derive_merge! {
 484     #[derive(Deserialize, Default, Clone)]
 485     #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 486     struct Dist {
 487         sign_folder: Option<String>,
 488         gpg_password_file: Option<String>,
 489         upload_addr: Option<String>,
 490         src_tarball: Option<bool>,
 491         missing_tools: Option<bool>,
 492         compression_formats: Option<Vec<String>>,
 493     }
 494 }
 495
 496 #[derive(Deserialize)]
 497 #[serde(untagged)]
 498 enum StringOrBool {
 499     String(String),
 500     Bool(bool),
 501 }
 502
 503 impl Default for StringOrBool {
 504     fn default() -> StringOrBool {
 505         StringOrBool::Bool(false)
 506     }
 507 }
 508
 509 derive_merge! {
 510     /// TOML representation of how the Rust build is configured.
 511     #[derive(Deserialize, Default)]
 512     #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 513     struct Rust {
 514         optimize: Option<bool>,
 515         debug: Option<bool>,
 516         codegen_units: Option<u32>,
 517         codegen_units_std: Option<u32>,
 518         debug_assertions: Option<bool>,
 519         debug_assertions_std: Option<bool>,
 520         overflow_checks: Option<bool>,
 521         overflow_checks_std: Option<bool>,
 522         debug_logging: Option<bool>,
 523         debuginfo_level: Option<u32>,
 524         debuginfo_level_rustc: Option<u32>,
 525         debuginfo_level_std: Option<u32>,
 526         debuginfo_level_tools: Option<u32>,
 527         debuginfo_level_tests: Option<u32>,
 528         run_dsymutil: Option<bool>,
 529         backtrace: Option<bool>,
 530         incremental: Option<bool>,
 531         parallel_compiler: Option<bool>,
 532         default_linker: Option<String>,
 533         channel: Option<String>,
 534         description: Option<String>,
 535         musl_root: Option<String>,
 536         rpath: Option<bool>,
 537         verbose_tests: Option<bool>,
 538         optimize_tests: Option<bool>,
 539         codegen_tests: Option<bool>,
 540         ignore_git: Option<bool>,
 541         dist_src: Option<bool>,
 542         save_toolstates: Option<String>,
 543         codegen_backends: Option<Vec<String>>,
 544         lld: Option<bool>,
 545         use_lld: Option<bool>,
 546         llvm_tools: Option<bool>,
 547         deny_warnings: Option<bool>,
 548         backtrace_on_ice: Option<bool>,
 549         verify_llvm_ir: Option<bool>,
 550         thin_lto_import_instr_limit: Option<u32>,
 551         remap_debuginfo: Option<bool>,
 552         jemalloc: Option<bool>,
 553         test_compare_mode: Option<bool>,
 554         llvm_libunwind: Option<String>,
 555         control_flow_guard: Option<bool>,
 556         new_symbol_mangling: Option<bool>,
 557         profile_generate: Option<String>,
 558         profile_use: Option<String>,
 559         // ignored; this is set from an env var set by bootstrap.py
 560         download_rustc: Option<StringOrBool>,
 561     }
 562 }
 563
 564 derive_merge! {
 565     /// TOML representation of how each build target is configured.
 566     #[derive(Deserialize, Default)]
 567     #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 568     struct TomlTarget {
 569         cc: Option<String>,
 570         cxx: Option<String>,
 571         ar: Option<String>,
 572         ranlib: Option<String>,
 573         default_linker: Option<PathBuf>,
 574         linker: Option<String>,
 575         llvm_config: Option<String>,
 576         llvm_filecheck: Option<String>,
 577         android_ndk: Option<String>,
 578         sanitizers: Option<bool>,
 579         profiler: Option<bool>,
 580         crt_static: Option<bool>,
 581         musl_root: Option<String>,
 582         musl_libdir: Option<String>,
 583         wasi_root: Option<String>,
 584         qemu_rootfs: Option<String>,
 585         no_std: Option<bool>,
 586     }
 587 }
 588
 589 impl Config {
 590     fn path_from_python(var_key: &str) -> PathBuf {
 591         match env::var_os(var_key) {
 592             Some(var_val) => Self::normalize_python_path(var_val),
 593             _ => panic!("expected '{}' to be set", var_key),
 594         }
 595     }
 596
 597     /// Normalizes paths from Python slightly. We don't trust paths from Python (#49785).
 598     fn normalize_python_path(path: OsString) -> PathBuf {
 599         Path::new(&path).components().collect()
 600     }
 601
 602     pub fn default_opts() -> Config {
 603         let mut config = Config::default();
 604         config.llvm_optimize = true;
 605         config.ninja_in_file = true;
 606         config.llvm_version_check = true;
 607         config.backtrace = true;
 608         config.rust_optimize = true;
 609         config.rust_optimize_tests = true;
 610         config.submodules = None;
 611         config.fast_submodules = true;
 612         config.docs = true;
 613         config.docs_minification = true;
 614         config.rust_rpath = true;
 615         config.channel = "dev".to_string();
 616         config.codegen_tests = true;
 617         config.rust_dist_src = true;
 618         config.rust_codegen_backends = vec![INTERNER.intern_str("llvm")];
 619         config.deny_warnings = true;
 620         config.bindir = "bin".into();
 621
 622         // set by build.rs
 623         config.build = TargetSelection::from_user(&env!("BUILD_TRIPLE"));
 624         let manifest_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
 625         // Undo `src/bootstrap`
 626         config.src = manifest_dir.parent().unwrap().parent().unwrap().to_owned();
 627         config.out = Config::path_from_python("BUILD_DIR");
 628
 629         config.initial_cargo = PathBuf::from(env!("CARGO"));
 630         config.initial_rustc = PathBuf::from(env!("RUSTC"));
 631
 632         config
 633     }
 634
 635     pub fn parse(args: &[String]) -> Config {
 636         let flags = Flags::parse(&args);
 637
 638         let mut config = Config::default_opts();
 639         config.exclude = flags.exclude.into_iter().map(|path| TaskPath::parse(path)).collect();
 640         config.include_default_paths = flags.include_default_paths;
 641         config.rustc_error_format = flags.rustc_error_format;
 642         config.json_output = flags.json_output;
 643         config.on_fail = flags.on_fail;
 644         config.jobs = flags.jobs.map(threads_from_config);
 645         config.cmd = flags.cmd;
 646         config.incremental = flags.incremental;
 647         config.dry_run = flags.dry_run;
 648         config.keep_stage = flags.keep_stage;
 649         config.keep_stage_std = flags.keep_stage_std;
 650         config.color = flags.color;
 651         if let Some(value) = flags.deny_warnings {
 652             config.deny_warnings = value;
 653         }
 654         config.llvm_profile_use = flags.llvm_profile_use;
 655         config.llvm_profile_generate = flags.llvm_profile_generate;
 656
 657         if config.dry_run {
 658             let dir = config.out.join("tmp-dry-run");
 659             t!(fs::create_dir_all(&dir));
 660             config.out = dir;
 661         }
 662
 663         #[cfg(test)]
 664         let get_toml = |_| TomlConfig::default();
 665         #[cfg(not(test))]
 666         let get_toml = |file: &Path| {
 667             use std::process;
 668
 669             let contents = t!(fs::read_to_string(file), "`include` config not found");
 670             match toml::from_str(&contents) {
 671                 Ok(table) => table,
 672                 Err(err) => {
 673                     println!("failed to parse TOML configuration '{}': {}", file.display(), err);
 674                     process::exit(2);
 675                 }
 676             }
 677         };
 678
 679         let mut toml = flags.config.as_deref().map(get_toml).unwrap_or_else(TomlConfig::default);
 680         if let Some(include) = &toml.profile {
 681             let mut include_path = config.src.clone();
 682             include_path.push("src");
 683             include_path.push("bootstrap");
 684             include_path.push("defaults");
 685             include_path.push(format!("config.{}.toml", include));
 686             let included_toml = get_toml(&include_path);
 687             toml.merge(included_toml);
 688         }
 689
 690         config.changelog_seen = toml.changelog_seen;
 691         if let Some(cfg) = flags.config {
 692             config.config = cfg;
 693         }
 694
 695         let build = toml.build.unwrap_or_default();
 696
 697         config.hosts = if let Some(arg_host) = flags.host {
 698             arg_host
 699         } else if let Some(file_host) = build.host {
 700             file_host.iter().map(|h| TargetSelection::from_user(h)).collect()
 701         } else {
 702             vec![config.build]
 703         };
 704         config.targets = if let Some(arg_target) = flags.target {
 705             arg_target
 706         } else if let Some(file_target) = build.target {
 707             file_target.iter().map(|h| TargetSelection::from_user(h)).collect()
 708         } else {
 709             // If target is *not* configured, then default to the host
 710             // toolchains.
 711             config.hosts.clone()
 712         };
 713
 714         config.nodejs = build.nodejs.map(PathBuf::from);
 715         config.npm = build.npm.map(PathBuf::from);
 716         config.gdb = build.gdb.map(PathBuf::from);
 717         config.python = build.python.map(PathBuf::from);
 718         config.submodules = build.submodules;
 719         set(&mut config.low_priority, build.low_priority);
 720         set(&mut config.compiler_docs, build.compiler_docs);
 721         set(&mut config.docs_minification, build.docs_minification);
 722         set(&mut config.docs, build.docs);
 723         set(&mut config.fast_submodules, build.fast_submodules);
 724         set(&mut config.locked_deps, build.locked_deps);
 725         set(&mut config.vendor, build.vendor);
 726         set(&mut config.full_bootstrap, build.full_bootstrap);
 727         set(&mut config.extended, build.extended);
 728         config.tools = build.tools;
 729         if build.rustfmt.is_some() {
 730             config.initial_rustfmt = build.rustfmt;
 731         }
 732         set(&mut config.verbose, build.verbose);
 733         set(&mut config.sanitizers, build.sanitizers);
 734         set(&mut config.profiler, build.profiler);
 735         set(&mut config.cargo_native_static, build.cargo_native_static);
 736         set(&mut config.configure_args, build.configure_args);
 737         set(&mut config.local_rebuild, build.local_rebuild);
 738         set(&mut config.print_step_timings, build.print_step_timings);
 739         set(&mut config.print_step_rusage, build.print_step_rusage);
 740
 741         config.verbose = cmp::max(config.verbose, flags.verbose);
 742
 743         if let Some(install) = toml.install {
 744             config.prefix = install.prefix.map(PathBuf::from);
 745             config.sysconfdir = install.sysconfdir.map(PathBuf::from);
 746             config.datadir = install.datadir.map(PathBuf::from);
 747             config.docdir = install.docdir.map(PathBuf::from);
 748             set(&mut config.bindir, install.bindir.map(PathBuf::from));
 749             config.libdir = install.libdir.map(PathBuf::from);
 750             config.mandir = install.mandir.map(PathBuf::from);
 751         }
 752
 753         // We want the llvm-skip-rebuild flag to take precedence over the
 754         // skip-rebuild config.toml option so we store it separately
 755         // so that we can infer the right value
 756         let mut llvm_skip_rebuild = flags.llvm_skip_rebuild;
 757
 758         // Store off these values as options because if they're not provided
 759         // we'll infer default values for them later
 760         let mut llvm_assertions = None;
 761         let mut llvm_tests = None;
 762         let mut llvm_plugins = None;
 763         let mut debug = None;
 764         let mut debug_assertions = None;
 765         let mut debug_assertions_std = None;
 766         let mut overflow_checks = None;
 767         let mut overflow_checks_std = None;
 768         let mut debug_logging = None;
 769         let mut debuginfo_level = None;
 770         let mut debuginfo_level_rustc = None;
 771         let mut debuginfo_level_std = None;
 772         let mut debuginfo_level_tools = None;
 773         let mut debuginfo_level_tests = None;
 774         let mut optimize = None;
 775         let mut ignore_git = None;
 776
 777         if let Some(llvm) = toml.llvm {
 778             match llvm.ccache {
 779                 Some(StringOrBool::String(ref s)) => config.ccache = Some(s.to_string()),
 780                 Some(StringOrBool::Bool(true)) => {
 781                     config.ccache = Some("ccache".to_string());
 782                 }
 783                 Some(StringOrBool::Bool(false)) | None => {}
 784             }
 785             set(&mut config.ninja_in_file, llvm.ninja);
 786             llvm_assertions = llvm.assertions;
 787             llvm_tests = llvm.tests;
 788             llvm_plugins = llvm.plugins;
 789             llvm_skip_rebuild = llvm_skip_rebuild.or(llvm.skip_rebuild);
 790             set(&mut config.llvm_optimize, llvm.optimize);
 791             set(&mut config.llvm_thin_lto, llvm.thin_lto);
 792             set(&mut config.llvm_release_debuginfo, llvm.release_debuginfo);
 793             set(&mut config.llvm_version_check, llvm.version_check);
 794             set(&mut config.llvm_static_stdcpp, llvm.static_libstdcpp);
 795             set(&mut config.llvm_link_shared, llvm.link_shared);
 796             config.llvm_targets = llvm.targets.clone();
 797             config.llvm_experimental_targets = llvm.experimental_targets.clone();
 798             config.llvm_link_jobs = llvm.link_jobs;
 799             config.llvm_version_suffix = llvm.version_suffix.clone();
 800             config.llvm_clang_cl = llvm.clang_cl.clone();
 801
 802             config.llvm_cflags = llvm.cflags.clone();
 803             config.llvm_cxxflags = llvm.cxxflags.clone();
 804             config.llvm_ldflags = llvm.ldflags.clone();
 805             set(&mut config.llvm_use_libcxx, llvm.use_libcxx);
 806             config.llvm_use_linker = llvm.use_linker.clone();
 807             config.llvm_allow_old_toolchain = llvm.allow_old_toolchain.unwrap_or(false);
 808             config.llvm_polly = llvm.polly.unwrap_or(false);
 809             config.llvm_clang = llvm.clang.unwrap_or(false);
 810             config.llvm_from_ci = match llvm.download_ci_llvm {
 811                 Some(StringOrBool::String(s)) => {
 812                     assert!(s == "if-available", "unknown option `{}` for download-ci-llvm", s);
 813                     // This is currently all tier 1 targets and tier 2 targets with host tools
 814                     // (since others may not have CI artifacts)
 815                     // https://doc.rust-lang.org/rustc/platform-support.html#tier-1
 816                     // FIXME: this is duplicated in bootstrap.py
 817                     let supported_platforms = [
 818                         // tier 1
 819                         "aarch64-unknown-linux-gnu",
 820                         "i686-pc-windows-gnu",
 821                         "i686-pc-windows-msvc",
 822                         "i686-unknown-linux-gnu",
 823                         "x86_64-unknown-linux-gnu",
 824                         "x86_64-apple-darwin",
 825                         "x86_64-pc-windows-gnu",
 826                         "x86_64-pc-windows-msvc",
 827                         // tier 2 with host tools
 828                         "aarch64-apple-darwin",
 829                         "aarch64-pc-windows-msvc",
 830                         "aarch64-unknown-linux-musl",
 831                         "arm-unknown-linux-gnueabi",
 832                         "arm-unknown-linux-gnueabihf",
 833                         "armv7-unknown-linux-gnueabihf",
 834                         "mips-unknown-linux-gnu",
 835                         "mips64-unknown-linux-gnuabi64",
 836                         "mips64el-unknown-linux-gnuabi64",
 837                         "mipsel-unknown-linux-gnu",
 838                         "powerpc-unknown-linux-gnu",
 839                         "powerpc64-unknown-linux-gnu",
 840                         "powerpc64le-unknown-linux-gnu",
 841                         "riscv64gc-unknown-linux-gnu",
 842                         "s390x-unknown-linux-gnu",
 843                         "x86_64-unknown-freebsd",
 844                         "x86_64-unknown-illumos",
 845                         "x86_64-unknown-linux-musl",
 846                         "x86_64-unknown-netbsd",
 847                     ];
 848                     supported_platforms.contains(&&*config.build.triple)
 849                 }
 850                 Some(StringOrBool::Bool(b)) => b,
 851                 None => false,
 852             };
 853
 854             if config.llvm_from_ci {
 855                 // None of the LLVM options, except assertions, are supported
 856                 // when using downloaded LLVM. We could just ignore these but
 857                 // that's potentially confusing, so force them to not be
 858                 // explicitly set. The defaults and CI defaults don't
 859                 // necessarily match but forcing people to match (somewhat
 860                 // arbitrary) CI configuration locally seems bad/hard.
 861                 check_ci_llvm!(llvm.optimize);
 862                 check_ci_llvm!(llvm.thin_lto);
 863                 check_ci_llvm!(llvm.release_debuginfo);
 864                 check_ci_llvm!(llvm.link_shared);
 865                 check_ci_llvm!(llvm.static_libstdcpp);
 866                 check_ci_llvm!(llvm.targets);
 867                 check_ci_llvm!(llvm.experimental_targets);
 868                 check_ci_llvm!(llvm.link_jobs);
 869                 check_ci_llvm!(llvm.clang_cl);
 870                 check_ci_llvm!(llvm.version_suffix);
 871                 check_ci_llvm!(llvm.cflags);
 872                 check_ci_llvm!(llvm.cxxflags);
 873                 check_ci_llvm!(llvm.ldflags);
 874                 check_ci_llvm!(llvm.use_libcxx);
 875                 check_ci_llvm!(llvm.use_linker);
 876                 check_ci_llvm!(llvm.allow_old_toolchain);
 877                 check_ci_llvm!(llvm.polly);
 878                 check_ci_llvm!(llvm.clang);
 879                 check_ci_llvm!(llvm.plugins);
 880
 881                 // CI-built LLVM can be either dynamic or static.
 882                 let ci_llvm = config.out.join(&*config.build.triple).join("ci-llvm");
 883                 config.llvm_link_shared = if config.dry_run {
 884                     // just assume dynamic for now
 885                     true
 886                 } else {
 887                     let link_type = t!(
 888                         std::fs::read_to_string(ci_llvm.join("link-type.txt")),
 889                         format!("CI llvm missing: {}", ci_llvm.display())
 890                     );
 891                     link_type == "dynamic"
 892                 };
 893             }
 894
 895             if config.llvm_thin_lto && llvm.link_shared.is_none() {
 896                 // If we're building with ThinLTO on, by default we want to link
 897                 // to LLVM shared, to avoid re-doing ThinLTO (which happens in
 898                 // the link step) with each stage.
 899                 config.llvm_link_shared = true;
 900             }
 901         }
 902
 903         if let Some(rust) = toml.rust {
 904             debug = rust.debug;
 905             debug_assertions = rust.debug_assertions;
 906             debug_assertions_std = rust.debug_assertions_std;
 907             overflow_checks = rust.overflow_checks;
 908             overflow_checks_std = rust.overflow_checks_std;
 909             debug_logging = rust.debug_logging;
 910             debuginfo_level = rust.debuginfo_level;
 911             debuginfo_level_rustc = rust.debuginfo_level_rustc;
 912             debuginfo_level_std = rust.debuginfo_level_std;
 913             debuginfo_level_tools = rust.debuginfo_level_tools;
 914             debuginfo_level_tests = rust.debuginfo_level_tests;
 915             config.rust_run_dsymutil = rust.run_dsymutil.unwrap_or(false);
 916             optimize = rust.optimize;
 917             ignore_git = rust.ignore_git;
 918             config.rust_new_symbol_mangling = rust.new_symbol_mangling;
 919             set(&mut config.rust_optimize_tests, rust.optimize_tests);
 920             set(&mut config.codegen_tests, rust.codegen_tests);
 921             set(&mut config.rust_rpath, rust.rpath);
 922             set(&mut config.jemalloc, rust.jemalloc);
 923             set(&mut config.test_compare_mode, rust.test_compare_mode);
 924             config.llvm_libunwind = rust
 925                 .llvm_libunwind
 926                 .map(|v| v.parse().expect("failed to parse rust.llvm-libunwind"))
 927                 .unwrap_or_default();
 928             set(&mut config.backtrace, rust.backtrace);
 929             set(&mut config.channel, rust.channel);
 930             config.description = rust.description;
 931             set(&mut config.rust_dist_src, rust.dist_src);
 932             set(&mut config.verbose_tests, rust.verbose_tests);
 933             // in the case "false" is set explicitly, do not overwrite the command line args
 934             if let Some(true) = rust.incremental {
 935                 config.incremental = true;
 936             }
 937             set(&mut config.use_lld, rust.use_lld);
 938             set(&mut config.lld_enabled, rust.lld);
 939             set(&mut config.llvm_tools_enabled, rust.llvm_tools);
 940             config.rustc_parallel = rust.parallel_compiler.unwrap_or(false);
 941             config.rustc_default_linker = rust.default_linker;
 942             config.musl_root = rust.musl_root.map(PathBuf::from);
 943             config.save_toolstates = rust.save_toolstates.map(PathBuf::from);
 944             set(&mut config.deny_warnings, flags.deny_warnings.or(rust.deny_warnings));
 945             set(&mut config.backtrace_on_ice, rust.backtrace_on_ice);
 946             set(&mut config.rust_verify_llvm_ir, rust.verify_llvm_ir);
 947             config.rust_thin_lto_import_instr_limit = rust.thin_lto_import_instr_limit;
 948             set(&mut config.rust_remap_debuginfo, rust.remap_debuginfo);
 949             set(&mut config.control_flow_guard, rust.control_flow_guard);
 950
 951             if let Some(ref backends) = rust.codegen_backends {
 952                 config.rust_codegen_backends =
 953                     backends.iter().map(|s| INTERNER.intern_str(s)).collect();
 954             }
 955
 956             config.rust_codegen_units = rust.codegen_units.map(threads_from_config);
 957             config.rust_codegen_units_std = rust.codegen_units_std.map(threads_from_config);
 958             config.rust_profile_use = flags.rust_profile_use.or(rust.profile_use);
 959             config.rust_profile_generate = flags.rust_profile_generate.or(rust.profile_generate);
 960             config.download_rustc = env::var("BOOTSTRAP_DOWNLOAD_RUSTC").as_deref() == Ok("1");
 961         } else {
 962             config.rust_profile_use = flags.rust_profile_use;
 963             config.rust_profile_generate = flags.rust_profile_generate;
 964         }
 965
 966         if let Some(t) = toml.target {
 967             for (triple, cfg) in t {
 968                 let mut target = Target::from_triple(&triple);
 969
 970                 if let Some(ref s) = cfg.llvm_config {
 971                     target.llvm_config = Some(config.src.join(s));
 972                 }
 973                 if let Some(ref s) = cfg.llvm_filecheck {
 974                     target.llvm_filecheck = Some(config.src.join(s));
 975                 }
 976                 if let Some(ref s) = cfg.android_ndk {
 977                     target.ndk = Some(config.src.join(s));
 978                 }
 979                 if let Some(s) = cfg.no_std {
 980                     target.no_std = s;
 981                 }
 982                 target.cc = cfg.cc.map(PathBuf::from);
 983                 target.cxx = cfg.cxx.map(PathBuf::from);
 984                 target.ar = cfg.ar.map(PathBuf::from);
 985                 target.ranlib = cfg.ranlib.map(PathBuf::from);
 986                 target.linker = cfg.linker.map(PathBuf::from);
 987                 target.crt_static = cfg.crt_static;
 988                 target.musl_root = cfg.musl_root.map(PathBuf::from);
 989                 target.musl_libdir = cfg.musl_libdir.map(PathBuf::from);
 990                 target.wasi_root = cfg.wasi_root.map(PathBuf::from);
 991                 target.qemu_rootfs = cfg.qemu_rootfs.map(PathBuf::from);
 992                 target.sanitizers = cfg.sanitizers;
 993                 target.profiler = cfg.profiler;
 994
 995                 config.target_config.insert(TargetSelection::from_user(&triple), target);
 996             }
 997         }
 998
 999         if config.llvm_from_ci {
1000             let triple = &config.build.triple;
1001             let mut build_target = config
1002                 .target_config
1003                 .entry(config.build)
1004                 .or_insert_with(|| Target::from_triple(&triple));
1005
1006             check_ci_llvm!(build_target.llvm_config);
1007             check_ci_llvm!(build_target.llvm_filecheck);
1008             let ci_llvm_bin = config.out.join(&*config.build.triple).join("ci-llvm/bin");
1009             build_target.llvm_config = Some(ci_llvm_bin.join(exe("llvm-config", config.build)));
1010             build_target.llvm_filecheck = Some(ci_llvm_bin.join(exe("FileCheck", config.build)));
1011         }
1012
1013         if let Some(t) = toml.dist {
1014             config.dist_sign_folder = t.sign_folder.map(PathBuf::from);
1015             config.dist_upload_addr = t.upload_addr;
1016             config.dist_compression_formats = t.compression_formats;
1017             set(&mut config.rust_dist_src, t.src_tarball);
1018             set(&mut config.missing_tools, t.missing_tools);
1019         }
1020
1021         config.initial_rustfmt = config.initial_rustfmt.or_else({
1022             let build = config.build;
1023             let initial_rustc = &config.initial_rustc;
1024
1025             move || {
1026                 // Cargo does not provide a RUSTFMT environment variable, so we
1027                 // synthesize it manually.
1028                 let rustfmt = initial_rustc.with_file_name(exe("rustfmt", build));
1029
1030                 if rustfmt.exists() { Some(rustfmt) } else { None }
1031             }
1032         });
1033
1034         // Now that we've reached the end of our configuration, infer the
1035         // default values for all options that we haven't otherwise stored yet.
1036
1037         config.llvm_skip_rebuild = llvm_skip_rebuild.unwrap_or(false);
1038         config.llvm_assertions = llvm_assertions.unwrap_or(false);
1039         config.llvm_tests = llvm_tests.unwrap_or(false);
1040         config.llvm_plugins = llvm_plugins.unwrap_or(false);
1041         config.rust_optimize = optimize.unwrap_or(true);
1042
1043         let default = debug == Some(true);
1044         config.rust_debug_assertions = debug_assertions.unwrap_or(default);
1045         config.rust_debug_assertions_std =
1046             debug_assertions_std.unwrap_or(config.rust_debug_assertions);
1047         config.rust_overflow_checks = overflow_checks.unwrap_or(default);
1048         config.rust_overflow_checks_std =
1049             overflow_checks_std.unwrap_or(config.rust_overflow_checks);
1050
1051         config.rust_debug_logging = debug_logging.unwrap_or(config.rust_debug_assertions);
1052
1053         let with_defaults = |debuginfo_level_specific: Option<u32>| {
1054             debuginfo_level_specific.or(debuginfo_level).unwrap_or(if debug == Some(true) {
1055                 1
1056             } else {
1057                 0
1058             })
1059         };
1060         config.rust_debuginfo_level_rustc = with_defaults(debuginfo_level_rustc);
1061         config.rust_debuginfo_level_std = with_defaults(debuginfo_level_std);
1062         config.rust_debuginfo_level_tools = with_defaults(debuginfo_level_tools);
1063         config.rust_debuginfo_level_tests = debuginfo_level_tests.unwrap_or(0);
1064
1065         let default = config.channel == "dev";
1066         config.ignore_git = ignore_git.unwrap_or(default);
1067
1068         let download_rustc = config.download_rustc;
1069         // See https://github.com/rust-lang/compiler-team/issues/326
1070         config.stage = match config.cmd {
1071             Subcommand::Check { .. } => flags.stage.or(build.check_stage).unwrap_or(0),
1072             // `download-rustc` only has a speed-up for stage2 builds. Default to stage2 unless explicitly overridden.
1073             Subcommand::Doc { .. } => {
1074                 flags.stage.or(build.doc_stage).unwrap_or(if download_rustc { 2 } else { 0 })
1075             }
1076             Subcommand::Build { .. } => {
1077                 flags.stage.or(build.build_stage).unwrap_or(if download_rustc { 2 } else { 1 })
1078             }
1079             Subcommand::Test { .. } => {
1080                 flags.stage.or(build.test_stage).unwrap_or(if download_rustc { 2 } else { 1 })
1081             }
1082             Subcommand::Bench { .. } => flags.stage.or(build.bench_stage).unwrap_or(2),
1083             Subcommand::Dist { .. } => flags.stage.or(build.dist_stage).unwrap_or(2),
1084             Subcommand::Install { .. } => flags.stage.or(build.install_stage).unwrap_or(2),
1085             // These are all bootstrap tools, which don't depend on the compiler.
1086             // The stage we pass shouldn't matter, but use 0 just in case.
1087             Subcommand::Clean { .. }
1088             | Subcommand::Clippy { .. }
1089             | Subcommand::Fix { .. }
1090             | Subcommand::Run { .. }
1091             | Subcommand::Setup { .. }
1092             | Subcommand::Format { .. } => flags.stage.unwrap_or(0),
1093         };
1094
1095         // CI should always run stage 2 builds, unless it specifically states otherwise
1096         #[cfg(not(test))]
1097         if flags.stage.is_none() && crate::CiEnv::current() != crate::CiEnv::None {
1098             match config.cmd {
1099                 Subcommand::Test { .. }
1100                 | Subcommand::Doc { .. }
1101                 | Subcommand::Build { .. }
1102                 | Subcommand::Bench { .. }
1103                 | Subcommand::Dist { .. }
1104                 | Subcommand::Install { .. } => {
1105                     assert_eq!(
1106                         config.stage, 2,
1107                         "x.py should be run with `--stage 2` on CI, but was run with `--stage {}`",
1108                         config.stage,
1109                     );
1110                 }
1111                 Subcommand::Clean { .. }
1112                 | Subcommand::Check { .. }
1113                 | Subcommand::Clippy { .. }
1114                 | Subcommand::Fix { .. }
1115                 | Subcommand::Run { .. }
1116                 | Subcommand::Setup { .. }
1117                 | Subcommand::Format { .. } => {}
1118             }
1119         }
1120
1121         config
1122     }
1123
1124     /// Try to find the relative path of `bindir`, otherwise return it in full.
1125     pub fn bindir_relative(&self) -> &Path {
1126         let bindir = &self.bindir;
1127         if bindir.is_absolute() {
1128             // Try to make it relative to the prefix.
1129             if let Some(prefix) = &self.prefix {
1130                 if let Ok(stripped) = bindir.strip_prefix(prefix) {
1131                     return stripped;
1132                 }
1133             }
1134         }
1135         bindir
1136     }
1137
1138     /// Try to find the relative path of `libdir`.
1139     pub fn libdir_relative(&self) -> Option<&Path> {
1140         let libdir = self.libdir.as_ref()?;
1141         if libdir.is_relative() {
1142             Some(libdir)
1143         } else {
1144             // Try to make it relative to the prefix.
1145             libdir.strip_prefix(self.prefix.as_ref()?).ok()
1146         }
1147     }
1148
1149     pub fn verbose(&self) -> bool {
1150         self.verbose > 0
1151     }
1152
1153     pub fn sanitizers_enabled(&self, target: TargetSelection) -> bool {
1154         self.target_config.get(&target).map(|t| t.sanitizers).flatten().unwrap_or(self.sanitizers)
1155     }
1156
1157     pub fn any_sanitizers_enabled(&self) -> bool {
1158         self.target_config.values().any(|t| t.sanitizers == Some(true)) || self.sanitizers
1159     }
1160
1161     pub fn profiler_enabled(&self, target: TargetSelection) -> bool {
1162         self.target_config.get(&target).map(|t| t.profiler).flatten().unwrap_or(self.profiler)
1163     }
1164
1165     pub fn any_profiler_enabled(&self) -> bool {
1166         self.target_config.values().any(|t| t.profiler == Some(true)) || self.profiler
1167     }
1168
1169     pub fn llvm_enabled(&self) -> bool {
1170         self.rust_codegen_backends.contains(&INTERNER.intern_str("llvm"))
1171     }
1172
1173     pub fn submodules(&self, rust_info: &GitInfo) -> bool {
1174         self.submodules.unwrap_or(rust_info.is_git())
1175     }
1176 }
1177
1178 fn set<T>(field: &mut T, val: Option<T>) {
1179     if let Some(v) = val {
1180         *field = v;
1181     }
1182 }
1183
1184 fn threads_from_config(v: u32) -> u32 {
1185     match v {
1186         0 => num_cpus::get() as u32,
1187         n => n,
1188     }
1189 }