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