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