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