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::fs;
  11 use std::path::{Path, PathBuf};
  12 use std::process;
  13
  14 use crate::cache::{Interned, INTERNER};
  15 use crate::flags::Flags;
  16 pub use crate::flags::Subcommand;
  17 use build_helper::t;
  18 use serde::Deserialize;
  19
  20 /// Global configuration for the entire build and/or bootstrap.
  21 ///
  22 /// This structure is derived from a combination of both `config.toml` and
  23 /// `config.mk`. As of the time of this writing it's unlikely that `config.toml`
  24 /// is used all that much, so this is primarily filled out by `config.mk` which
  25 /// is generated from `./configure`.
  26 ///
  27 /// Note that this structure is not decoded directly into, but rather it is
  28 /// filled out from the decoded forms of the structs below. For documentation
  29 /// each field, see the corresponding fields in
  30 /// `config.toml.example`.
  31 #[derive(Default)]
  32 pub struct Config {
  33     pub ccache: Option<String>,
  34     pub ninja: bool,
  35     pub verbose: usize,
  36     pub submodules: bool,
  37     pub fast_submodules: bool,
  38     pub compiler_docs: bool,
  39     pub docs: bool,
  40     pub locked_deps: bool,
  41     pub vendor: bool,
  42     pub target_config: HashMap<Interned<String>, Target>,
  43     pub full_bootstrap: bool,
  44     pub extended: bool,
  45     pub tools: Option<HashSet<String>>,
  46     pub sanitizers: bool,
  47     pub profiler: bool,
  48     pub ignore_git: bool,
  49     pub exclude: Vec<PathBuf>,
  50     pub rustc_error_format: Option<String>,
  51     pub json_output: bool,
  52     pub test_compare_mode: bool,
  53     pub llvm_libunwind: bool,
  54
  55     pub skip_only_host_steps: bool,
  56
  57     pub on_fail: Option<String>,
  58     pub stage: Option<u32>,
  59     pub keep_stage: Vec<u32>,
  60     pub src: PathBuf,
  61     pub jobs: Option<u32>,
  62     pub cmd: Subcommand,
  63     pub incremental: bool,
  64     pub dry_run: bool,
  65
  66     pub deny_warnings: bool,
  67     pub backtrace_on_ice: bool,
  68
  69     // llvm codegen options
  70     pub llvm_skip_rebuild: bool,
  71     pub llvm_assertions: bool,
  72     pub llvm_optimize: bool,
  73     pub llvm_thin_lto: bool,
  74     pub llvm_release_debuginfo: bool,
  75     pub llvm_version_check: bool,
  76     pub llvm_static_stdcpp: bool,
  77     pub llvm_link_shared: bool,
  78     pub llvm_clang_cl: Option<String>,
  79     pub llvm_targets: Option<String>,
  80     pub llvm_experimental_targets: Option<String>,
  81     pub llvm_link_jobs: Option<u32>,
  82     pub llvm_version_suffix: Option<String>,
  83     pub llvm_use_linker: Option<String>,
  84     pub llvm_allow_old_toolchain: Option<bool>,
  85
  86     pub use_lld: bool,
  87     pub lld_enabled: bool,
  88     pub llvm_tools_enabled: bool,
  89
  90     pub llvm_cflags: Option<String>,
  91     pub llvm_cxxflags: Option<String>,
  92     pub llvm_ldflags: Option<String>,
  93     pub llvm_use_libcxx: bool,
  94
  95     // rust codegen options
  96     pub rust_optimize: bool,
  97     pub rust_codegen_units: Option<u32>,
  98     pub rust_codegen_units_std: Option<u32>,
  99     pub rust_debug_assertions: bool,
 100     pub rust_debug_assertions_std: bool,
 101     pub rust_debuginfo_level_rustc: u32,
 102     pub rust_debuginfo_level_std: u32,
 103     pub rust_debuginfo_level_tools: u32,
 104     pub rust_debuginfo_level_tests: u32,
 105     pub rust_rpath: bool,
 106     pub rustc_parallel: bool,
 107     pub rustc_default_linker: Option<String>,
 108     pub rust_optimize_tests: bool,
 109     pub rust_dist_src: bool,
 110     pub rust_codegen_backends: Vec<Interned<String>>,
 111     pub rust_verify_llvm_ir: bool,
 112     pub rust_thin_lto_import_instr_limit: Option<u32>,
 113     pub rust_remap_debuginfo: bool,
 114
 115     pub build: Interned<String>,
 116     pub hosts: Vec<Interned<String>>,
 117     pub targets: Vec<Interned<String>>,
 118     pub local_rebuild: bool,
 119     pub jemalloc: bool,
 120     pub control_flow_guard: bool,
 121
 122     // dist misc
 123     pub dist_sign_folder: Option<PathBuf>,
 124     pub dist_upload_addr: Option<String>,
 125     pub dist_gpg_password_file: Option<PathBuf>,
 126
 127     // libstd features
 128     pub backtrace: bool, // support for RUST_BACKTRACE
 129
 130     // misc
 131     pub low_priority: bool,
 132     pub channel: String,
 133     pub verbose_tests: bool,
 134     pub save_toolstates: Option<PathBuf>,
 135     pub print_step_timings: bool,
 136     pub missing_tools: bool,
 137
 138     // Fallback musl-root for all targets
 139     pub musl_root: Option<PathBuf>,
 140     pub prefix: Option<PathBuf>,
 141     pub sysconfdir: Option<PathBuf>,
 142     pub datadir: Option<PathBuf>,
 143     pub docdir: Option<PathBuf>,
 144     pub bindir: PathBuf,
 145     pub libdir: Option<PathBuf>,
 146     pub mandir: Option<PathBuf>,
 147     pub codegen_tests: bool,
 148     pub nodejs: Option<PathBuf>,
 149     pub gdb: Option<PathBuf>,
 150     pub python: Option<PathBuf>,
 151     pub cargo_native_static: bool,
 152     pub configure_args: Vec<String>,
 153
 154     // These are either the stage0 downloaded binaries or the locally installed ones.
 155     pub initial_cargo: PathBuf,
 156     pub initial_rustc: PathBuf,
 157     pub initial_rustfmt: Option<PathBuf>,
 158     pub out: PathBuf,
 159 }
 160
 161 /// Per-target configuration stored in the global configuration structure.
 162 #[derive(Default)]
 163 pub struct Target {
 164     /// Some(path to llvm-config) if using an external LLVM.
 165     pub llvm_config: Option<PathBuf>,
 166     /// Some(path to FileCheck) if one was specified.
 167     pub llvm_filecheck: Option<PathBuf>,
 168     pub cc: Option<PathBuf>,
 169     pub cxx: Option<PathBuf>,
 170     pub ar: Option<PathBuf>,
 171     pub ranlib: Option<PathBuf>,
 172     pub linker: Option<PathBuf>,
 173     pub ndk: Option<PathBuf>,
 174     pub crt_static: Option<bool>,
 175     pub musl_root: Option<PathBuf>,
 176     pub wasi_root: Option<PathBuf>,
 177     pub qemu_rootfs: Option<PathBuf>,
 178     pub no_std: bool,
 179 }
 180
 181 impl Target {
 182     pub fn from_triple(triple: &str) -> Self {
 183         let mut target: Self = Default::default();
 184         if triple.contains("-none") || triple.contains("nvptx") {
 185             target.no_std = true;
 186         }
 187         target
 188     }
 189 }
 190 /// Structure of the `config.toml` file that configuration is read from.
 191 ///
 192 /// This structure uses `Decodable` to automatically decode a TOML configuration
 193 /// file into this format, and then this is traversed and written into the above
 194 /// `Config` structure.
 195 #[derive(Deserialize, Default)]
 196 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 197 struct TomlConfig {
 198     build: Option<Build>,
 199     install: Option<Install>,
 200     llvm: Option<Llvm>,
 201     rust: Option<Rust>,
 202     target: Option<HashMap<String, TomlTarget>>,
 203     dist: Option<Dist>,
 204 }
 205
 206 /// TOML representation of various global build decisions.
 207 #[derive(Deserialize, Default, Clone)]
 208 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 209 struct Build {
 210     build: Option<String>,
 211     #[serde(default)]
 212     host: Vec<String>,
 213     #[serde(default)]
 214     target: Vec<String>,
 215     // This is ignored, the rust code always gets the build directory from the `BUILD_DIR` env variable
 216     build_dir: Option<String>,
 217     cargo: Option<String>,
 218     rustc: Option<String>,
 219     rustfmt: Option<String>, /* allow bootstrap.py to use rustfmt key */
 220     docs: Option<bool>,
 221     compiler_docs: Option<bool>,
 222     submodules: Option<bool>,
 223     fast_submodules: Option<bool>,
 224     gdb: Option<String>,
 225     nodejs: Option<String>,
 226     python: Option<String>,
 227     locked_deps: Option<bool>,
 228     vendor: Option<bool>,
 229     full_bootstrap: Option<bool>,
 230     extended: Option<bool>,
 231     tools: Option<HashSet<String>>,
 232     verbose: Option<usize>,
 233     sanitizers: Option<bool>,
 234     profiler: Option<bool>,
 235     cargo_native_static: Option<bool>,
 236     low_priority: Option<bool>,
 237     configure_args: Option<Vec<String>>,
 238     local_rebuild: Option<bool>,
 239     print_step_timings: Option<bool>,
 240 }
 241
 242 /// TOML representation of various global install decisions.
 243 #[derive(Deserialize, Default, Clone)]
 244 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 245 struct Install {
 246     prefix: Option<String>,
 247     sysconfdir: Option<String>,
 248     docdir: Option<String>,
 249     bindir: Option<String>,
 250     libdir: Option<String>,
 251     mandir: Option<String>,
 252     datadir: Option<String>,
 253
 254     // standard paths, currently unused
 255     infodir: Option<String>,
 256     localstatedir: Option<String>,
 257 }
 258
 259 /// TOML representation of how the LLVM build is configured.
 260 #[derive(Deserialize, Default)]
 261 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 262 struct Llvm {
 263     skip_rebuild: Option<bool>,
 264     optimize: Option<bool>,
 265     thin_lto: Option<bool>,
 266     release_debuginfo: Option<bool>,
 267     assertions: Option<bool>,
 268     ccache: Option<StringOrBool>,
 269     version_check: Option<bool>,
 270     static_libstdcpp: Option<bool>,
 271     ninja: Option<bool>,
 272     targets: Option<String>,
 273     experimental_targets: Option<String>,
 274     link_jobs: Option<u32>,
 275     link_shared: Option<bool>,
 276     version_suffix: Option<String>,
 277     clang_cl: Option<String>,
 278     cflags: Option<String>,
 279     cxxflags: Option<String>,
 280     ldflags: Option<String>,
 281     use_libcxx: Option<bool>,
 282     use_linker: Option<String>,
 283     allow_old_toolchain: Option<bool>,
 284 }
 285
 286 #[derive(Deserialize, Default, Clone)]
 287 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 288 struct Dist {
 289     sign_folder: Option<String>,
 290     gpg_password_file: Option<String>,
 291     upload_addr: Option<String>,
 292     src_tarball: Option<bool>,
 293     missing_tools: Option<bool>,
 294 }
 295
 296 #[derive(Deserialize)]
 297 #[serde(untagged)]
 298 enum StringOrBool {
 299     String(String),
 300     Bool(bool),
 301 }
 302
 303 impl Default for StringOrBool {
 304     fn default() -> StringOrBool {
 305         StringOrBool::Bool(false)
 306     }
 307 }
 308
 309 /// TOML representation of how the Rust build is configured.
 310 #[derive(Deserialize, Default)]
 311 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 312 struct Rust {
 313     optimize: Option<bool>,
 314     debug: Option<bool>,
 315     codegen_units: Option<u32>,
 316     codegen_units_std: Option<u32>,
 317     debug_assertions: Option<bool>,
 318     debug_assertions_std: Option<bool>,
 319     debuginfo_level: Option<u32>,
 320     debuginfo_level_rustc: Option<u32>,
 321     debuginfo_level_std: Option<u32>,
 322     debuginfo_level_tools: Option<u32>,
 323     debuginfo_level_tests: Option<u32>,
 324     backtrace: Option<bool>,
 325     incremental: Option<bool>,
 326     parallel_compiler: Option<bool>,
 327     default_linker: Option<String>,
 328     channel: Option<String>,
 329     musl_root: Option<String>,
 330     rpath: Option<bool>,
 331     verbose_tests: Option<bool>,
 332     optimize_tests: Option<bool>,
 333     codegen_tests: Option<bool>,
 334     ignore_git: Option<bool>,
 335     dist_src: Option<bool>,
 336     save_toolstates: Option<String>,
 337     codegen_backends: Option<Vec<String>>,
 338     lld: Option<bool>,
 339     use_lld: Option<bool>,
 340     llvm_tools: Option<bool>,
 341     deny_warnings: Option<bool>,
 342     backtrace_on_ice: Option<bool>,
 343     verify_llvm_ir: Option<bool>,
 344     thin_lto_import_instr_limit: Option<u32>,
 345     remap_debuginfo: Option<bool>,
 346     jemalloc: Option<bool>,
 347     test_compare_mode: Option<bool>,
 348     llvm_libunwind: Option<bool>,
 349     control_flow_guard: Option<bool>,
 350 }
 351
 352 /// TOML representation of how each build target is configured.
 353 #[derive(Deserialize, Default)]
 354 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 355 struct TomlTarget {
 356     cc: Option<String>,
 357     cxx: Option<String>,
 358     ar: Option<String>,
 359     ranlib: Option<String>,
 360     linker: Option<String>,
 361     llvm_config: Option<String>,
 362     llvm_filecheck: Option<String>,
 363     android_ndk: Option<String>,
 364     crt_static: Option<bool>,
 365     musl_root: Option<String>,
 366     wasi_root: Option<String>,
 367     qemu_rootfs: Option<String>,
 368     no_std: Option<bool>,
 369 }
 370
 371 impl Config {
 372     fn path_from_python(var_key: &str) -> PathBuf {
 373         match env::var_os(var_key) {
 374             Some(var_val) => Self::normalize_python_path(var_val),
 375             _ => panic!("expected '{}' to be set", var_key),
 376         }
 377     }
 378
 379     /// Normalizes paths from Python slightly. We don't trust paths from Python (#49785).
 380     fn normalize_python_path(path: OsString) -> PathBuf {
 381         Path::new(&path).components().collect()
 382     }
 383
 384     pub fn default_opts() -> Config {
 385         let mut config = Config::default();
 386         config.llvm_optimize = true;
 387         config.llvm_version_check = true;
 388         config.backtrace = true;
 389         config.rust_optimize = true;
 390         config.rust_optimize_tests = true;
 391         config.submodules = true;
 392         config.fast_submodules = true;
 393         config.docs = true;
 394         config.rust_rpath = true;
 395         config.channel = "dev".to_string();
 396         config.codegen_tests = true;
 397         config.ignore_git = false;
 398         config.rust_dist_src = true;
 399         config.rust_codegen_backends = vec![INTERNER.intern_str("llvm")];
 400         config.deny_warnings = true;
 401         config.missing_tools = false;
 402
 403         // set by bootstrap.py
 404         config.build = INTERNER.intern_str(&env::var("BUILD").expect("'BUILD' to be set"));
 405         config.src = Config::path_from_python("SRC");
 406         config.out = Config::path_from_python("BUILD_DIR");
 407
 408         config.initial_rustc = Config::path_from_python("RUSTC");
 409         config.initial_cargo = Config::path_from_python("CARGO");
 410         config.initial_rustfmt = env::var_os("RUSTFMT").map(Config::normalize_python_path);
 411
 412         config
 413     }
 414
 415     pub fn parse(args: &[String]) -> Config {
 416         let flags = Flags::parse(&args);
 417         let file = flags.config.clone();
 418         let mut config = Config::default_opts();
 419         config.exclude = flags.exclude;
 420         config.rustc_error_format = flags.rustc_error_format;
 421         config.json_output = flags.json_output;
 422         config.on_fail = flags.on_fail;
 423         config.stage = flags.stage;
 424         config.jobs = flags.jobs.map(threads_from_config);
 425         config.cmd = flags.cmd;
 426         config.incremental = flags.incremental;
 427         config.dry_run = flags.dry_run;
 428         config.keep_stage = flags.keep_stage;
 429         config.bindir = "bin".into(); // default
 430         if let Some(value) = flags.deny_warnings {
 431             config.deny_warnings = value;
 432         }
 433
 434         if config.dry_run {
 435             let dir = config.out.join("tmp-dry-run");
 436             t!(fs::create_dir_all(&dir));
 437             config.out = dir;
 438         }
 439
 440         // If --target was specified but --host wasn't specified, don't run any host-only tests.
 441         let has_hosts = !flags.host.is_empty();
 442         let has_targets = !flags.target.is_empty();
 443         config.skip_only_host_steps = !has_hosts && has_targets;
 444
 445         let toml = file
 446             .map(|file| {
 447                 let contents = t!(fs::read_to_string(&file));
 448                 match toml::from_str(&contents) {
 449                     Ok(table) => table,
 450                     Err(err) => {
 451                         println!(
 452                             "failed to parse TOML configuration '{}': {}",
 453                             file.display(),
 454                             err
 455                         );
 456                         process::exit(2);
 457                     }
 458                 }
 459             })
 460             .unwrap_or_else(TomlConfig::default);
 461
 462         let build = toml.build.clone().unwrap_or_default();
 463         // set by bootstrap.py
 464         config.hosts.push(config.build.clone());
 465         for host in build.host.iter() {
 466             let host = INTERNER.intern_str(host);
 467             if !config.hosts.contains(&host) {
 468                 config.hosts.push(host);
 469             }
 470         }
 471         for target in
 472             config.hosts.iter().cloned().chain(build.target.iter().map(|s| INTERNER.intern_str(s)))
 473         {
 474             if !config.targets.contains(&target) {
 475                 config.targets.push(target);
 476             }
 477         }
 478         config.hosts = if !flags.host.is_empty() { flags.host } else { config.hosts };
 479         config.targets = if !flags.target.is_empty() { flags.target } else { config.targets };
 480
 481         config.nodejs = build.nodejs.map(PathBuf::from);
 482         config.gdb = build.gdb.map(PathBuf::from);
 483         config.python = build.python.map(PathBuf::from);
 484         set(&mut config.low_priority, build.low_priority);
 485         set(&mut config.compiler_docs, build.compiler_docs);
 486         set(&mut config.docs, build.docs);
 487         set(&mut config.submodules, build.submodules);
 488         set(&mut config.fast_submodules, build.fast_submodules);
 489         set(&mut config.locked_deps, build.locked_deps);
 490         set(&mut config.vendor, build.vendor);
 491         set(&mut config.full_bootstrap, build.full_bootstrap);
 492         set(&mut config.extended, build.extended);
 493         config.tools = build.tools;
 494         set(&mut config.verbose, build.verbose);
 495         set(&mut config.sanitizers, build.sanitizers);
 496         set(&mut config.profiler, build.profiler);
 497         set(&mut config.cargo_native_static, build.cargo_native_static);
 498         set(&mut config.configure_args, build.configure_args);
 499         set(&mut config.local_rebuild, build.local_rebuild);
 500         set(&mut config.print_step_timings, build.print_step_timings);
 501         config.verbose = cmp::max(config.verbose, flags.verbose);
 502
 503         if let Some(ref install) = toml.install {
 504             config.prefix = install.prefix.clone().map(PathBuf::from);
 505             config.sysconfdir = install.sysconfdir.clone().map(PathBuf::from);
 506             config.datadir = install.datadir.clone().map(PathBuf::from);
 507             config.docdir = install.docdir.clone().map(PathBuf::from);
 508             set(&mut config.bindir, install.bindir.clone().map(PathBuf::from));
 509             config.libdir = install.libdir.clone().map(PathBuf::from);
 510             config.mandir = install.mandir.clone().map(PathBuf::from);
 511         }
 512
 513         // We want the llvm-skip-rebuild flag to take precedence over the
 514         // skip-rebuild config.toml option so we store it separately
 515         // so that we can infer the right value
 516         let mut llvm_skip_rebuild = flags.llvm_skip_rebuild;
 517
 518         // Store off these values as options because if they're not provided
 519         // we'll infer default values for them later
 520         let mut llvm_assertions = None;
 521         let mut debug = None;
 522         let mut debug_assertions = None;
 523         let mut debug_assertions_std = None;
 524         let mut debuginfo_level = None;
 525         let mut debuginfo_level_rustc = None;
 526         let mut debuginfo_level_std = None;
 527         let mut debuginfo_level_tools = None;
 528         let mut debuginfo_level_tests = None;
 529         let mut optimize = None;
 530         let mut ignore_git = None;
 531
 532         if let Some(ref llvm) = toml.llvm {
 533             match llvm.ccache {
 534                 Some(StringOrBool::String(ref s)) => config.ccache = Some(s.to_string()),
 535                 Some(StringOrBool::Bool(true)) => {
 536                     config.ccache = Some("ccache".to_string());
 537                 }
 538                 Some(StringOrBool::Bool(false)) | None => {}
 539             }
 540             set(&mut config.ninja, llvm.ninja);
 541             llvm_assertions = llvm.assertions;
 542             llvm_skip_rebuild = llvm_skip_rebuild.or(llvm.skip_rebuild);
 543             set(&mut config.llvm_optimize, llvm.optimize);
 544             set(&mut config.llvm_thin_lto, llvm.thin_lto);
 545             set(&mut config.llvm_release_debuginfo, llvm.release_debuginfo);
 546             set(&mut config.llvm_version_check, llvm.version_check);
 547             set(&mut config.llvm_static_stdcpp, llvm.static_libstdcpp);
 548             set(&mut config.llvm_link_shared, llvm.link_shared);
 549             config.llvm_targets = llvm.targets.clone();
 550             config.llvm_experimental_targets = llvm.experimental_targets.clone();
 551             config.llvm_link_jobs = llvm.link_jobs;
 552             config.llvm_version_suffix = llvm.version_suffix.clone();
 553             config.llvm_clang_cl = llvm.clang_cl.clone();
 554
 555             config.llvm_cflags = llvm.cflags.clone();
 556             config.llvm_cxxflags = llvm.cxxflags.clone();
 557             config.llvm_ldflags = llvm.ldflags.clone();
 558             set(&mut config.llvm_use_libcxx, llvm.use_libcxx);
 559             config.llvm_use_linker = llvm.use_linker.clone();
 560             config.llvm_allow_old_toolchain = llvm.allow_old_toolchain;
 561         }
 562
 563         if let Some(ref rust) = toml.rust {
 564             debug = rust.debug;
 565             debug_assertions = rust.debug_assertions;
 566             debug_assertions_std = rust.debug_assertions_std;
 567             debuginfo_level = rust.debuginfo_level;
 568             debuginfo_level_rustc = rust.debuginfo_level_rustc;
 569             debuginfo_level_std = rust.debuginfo_level_std;
 570             debuginfo_level_tools = rust.debuginfo_level_tools;
 571             debuginfo_level_tests = rust.debuginfo_level_tests;
 572             optimize = rust.optimize;
 573             ignore_git = rust.ignore_git;
 574             set(&mut config.rust_optimize_tests, rust.optimize_tests);
 575             set(&mut config.codegen_tests, rust.codegen_tests);
 576             set(&mut config.rust_rpath, rust.rpath);
 577             set(&mut config.jemalloc, rust.jemalloc);
 578             set(&mut config.test_compare_mode, rust.test_compare_mode);
 579             set(&mut config.llvm_libunwind, rust.llvm_libunwind);
 580             set(&mut config.backtrace, rust.backtrace);
 581             set(&mut config.channel, rust.channel.clone());
 582             set(&mut config.rust_dist_src, rust.dist_src);
 583             set(&mut config.verbose_tests, rust.verbose_tests);
 584             // in the case "false" is set explicitly, do not overwrite the command line args
 585             if let Some(true) = rust.incremental {
 586                 config.incremental = true;
 587             }
 588             set(&mut config.use_lld, rust.use_lld);
 589             set(&mut config.lld_enabled, rust.lld);
 590             set(&mut config.llvm_tools_enabled, rust.llvm_tools);
 591             config.rustc_parallel = rust.parallel_compiler.unwrap_or(false);
 592             config.rustc_default_linker = rust.default_linker.clone();
 593             config.musl_root = rust.musl_root.clone().map(PathBuf::from);
 594             config.save_toolstates = rust.save_toolstates.clone().map(PathBuf::from);
 595             set(&mut config.deny_warnings, flags.deny_warnings.or(rust.deny_warnings));
 596             set(&mut config.backtrace_on_ice, rust.backtrace_on_ice);
 597             set(&mut config.rust_verify_llvm_ir, rust.verify_llvm_ir);
 598             config.rust_thin_lto_import_instr_limit = rust.thin_lto_import_instr_limit;
 599             set(&mut config.rust_remap_debuginfo, rust.remap_debuginfo);
 600             set(&mut config.control_flow_guard, rust.control_flow_guard);
 601
 602             if let Some(ref backends) = rust.codegen_backends {
 603                 config.rust_codegen_backends =
 604                     backends.iter().map(|s| INTERNER.intern_str(s)).collect();
 605             }
 606
 607             config.rust_codegen_units = rust.codegen_units.map(threads_from_config);
 608             config.rust_codegen_units_std = rust.codegen_units_std.map(threads_from_config);
 609         }
 610
 611         if let Some(ref t) = toml.target {
 612             for (triple, cfg) in t {
 613                 let mut target = Target::from_triple(triple);
 614
 615                 if let Some(ref s) = cfg.llvm_config {
 616                     target.llvm_config = Some(config.src.join(s));
 617                 }
 618                 if let Some(ref s) = cfg.llvm_filecheck {
 619                     target.llvm_filecheck = Some(config.src.join(s));
 620                 }
 621                 if let Some(ref s) = cfg.android_ndk {
 622                     target.ndk = Some(config.src.join(s));
 623                 }
 624                 if let Some(s) = cfg.no_std {
 625                     target.no_std = s;
 626                 }
 627                 target.cc = cfg.cc.clone().map(PathBuf::from);
 628                 target.cxx = cfg.cxx.clone().map(PathBuf::from);
 629                 target.ar = cfg.ar.clone().map(PathBuf::from);
 630                 target.ranlib = cfg.ranlib.clone().map(PathBuf::from);
 631                 target.linker = cfg.linker.clone().map(PathBuf::from);
 632                 target.crt_static = cfg.crt_static;
 633                 target.musl_root = cfg.musl_root.clone().map(PathBuf::from);
 634                 target.wasi_root = cfg.wasi_root.clone().map(PathBuf::from);
 635                 target.qemu_rootfs = cfg.qemu_rootfs.clone().map(PathBuf::from);
 636
 637                 config.target_config.insert(INTERNER.intern_string(triple.clone()), target);
 638             }
 639         }
 640
 641         if let Some(ref t) = toml.dist {
 642             config.dist_sign_folder = t.sign_folder.clone().map(PathBuf::from);
 643             config.dist_gpg_password_file = t.gpg_password_file.clone().map(PathBuf::from);
 644             config.dist_upload_addr = t.upload_addr.clone();
 645             set(&mut config.rust_dist_src, t.src_tarball);
 646             set(&mut config.missing_tools, t.missing_tools);
 647         }
 648
 649         // Now that we've reached the end of our configuration, infer the
 650         // default values for all options that we haven't otherwise stored yet.
 651
 652         set(&mut config.initial_rustc, build.rustc.map(PathBuf::from));
 653         set(&mut config.initial_cargo, build.cargo.map(PathBuf::from));
 654
 655         config.llvm_skip_rebuild = llvm_skip_rebuild.unwrap_or(false);
 656
 657         let default = false;
 658         config.llvm_assertions = llvm_assertions.unwrap_or(default);
 659
 660         let default = true;
 661         config.rust_optimize = optimize.unwrap_or(default);
 662
 663         let default = debug == Some(true);
 664         config.rust_debug_assertions = debug_assertions.unwrap_or(default);
 665         config.rust_debug_assertions_std =
 666             debug_assertions_std.unwrap_or(config.rust_debug_assertions);
 667
 668         let with_defaults = |debuginfo_level_specific: Option<u32>| {
 669             debuginfo_level_specific.or(debuginfo_level).unwrap_or(if debug == Some(true) {
 670                 2
 671             } else {
 672                 0
 673             })
 674         };
 675         config.rust_debuginfo_level_rustc = with_defaults(debuginfo_level_rustc);
 676         config.rust_debuginfo_level_std = with_defaults(debuginfo_level_std);
 677         config.rust_debuginfo_level_tools = with_defaults(debuginfo_level_tools);
 678         config.rust_debuginfo_level_tests = debuginfo_level_tests.unwrap_or(0);
 679
 680         let default = config.channel == "dev";
 681         config.ignore_git = ignore_git.unwrap_or(default);
 682
 683         config
 684     }
 685
 686     /// Try to find the relative path of `bindir`, otherwise return it in full.
 687     pub fn bindir_relative(&self) -> &Path {
 688         let bindir = &self.bindir;
 689         if bindir.is_absolute() {
 690             // Try to make it relative to the prefix.
 691             if let Some(prefix) = &self.prefix {
 692                 if let Ok(stripped) = bindir.strip_prefix(prefix) {
 693                     return stripped;
 694                 }
 695             }
 696         }
 697         bindir
 698     }
 699
 700     /// Try to find the relative path of `libdir`.
 701     pub fn libdir_relative(&self) -> Option<&Path> {
 702         let libdir = self.libdir.as_ref()?;
 703         if libdir.is_relative() {
 704             Some(libdir)
 705         } else {
 706             // Try to make it relative to the prefix.
 707             libdir.strip_prefix(self.prefix.as_ref()?).ok()
 708         }
 709     }
 710
 711     pub fn verbose(&self) -> bool {
 712         self.verbose > 0
 713     }
 714
 715     pub fn very_verbose(&self) -> bool {
 716         self.verbose > 1
 717     }
 718
 719     pub fn llvm_enabled(&self) -> bool {
 720         self.rust_codegen_backends.contains(&INTERNER.intern_str("llvm"))
 721     }
 722 }
 723
 724 fn set<T>(field: &mut T, val: Option<T>) {
 725     if let Some(v) = val {
 726         *field = v;
 727     }
 728 }
 729
 730 fn threads_from_config(v: u32) -> u32 {
 731     match v {
 732         0 => num_cpus::get() as u32,
 733         n => n,
 734     }
 735 }