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