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