src/bootstrap/config.rs

   1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 //! Serialized configuration of a build.
  12 //!
  13 //! This module implements parsing `config.mk` and `config.toml` configuration
  14 //! files to tweak how the build runs.
  15
  16 use std::collections::HashMap;
  17 use std::env;
  18 use std::fs::{self, File};
  19 use std::io::prelude::*;
  20 use std::path::PathBuf;
  21 use std::process;
  22 use std::cmp;
  23
  24 use num_cpus;
  25 use toml;
  26 use util::{exe, push_exe_path};
  27 use cache::{INTERNER, Interned};
  28 use flags::Flags;
  29 pub use flags::Subcommand;
  30
  31 /// Global configuration for the entire build and/or bootstrap.
  32 ///
  33 /// This structure is derived from a combination of both `config.toml` and
  34 /// `config.mk`. As of the time of this writing it's unlikely that `config.toml`
  35 /// is used all that much, so this is primarily filled out by `config.mk` which
  36 /// is generated from `./configure`.
  37 ///
  38 /// Note that this structure is not decoded directly into, but rather it is
  39 /// filled out from the decoded forms of the structs below. For documentation
  40 /// each field, see the corresponding fields in
  41 /// `config.toml.example`.
  42 #[derive(Default)]
  43 pub struct Config {
  44     pub ccache: Option<String>,
  45     pub ninja: bool,
  46     pub verbose: usize,
  47     pub submodules: bool,
  48     pub compiler_docs: bool,
  49     pub docs: bool,
  50     pub locked_deps: bool,
  51     pub vendor: bool,
  52     pub target_config: HashMap<Interned<String>, Target>,
  53     pub full_bootstrap: bool,
  54     pub extended: bool,
  55     pub sanitizers: bool,
  56     pub profiler: bool,
  57
  58     pub on_fail: Option<String>,
  59     pub stage: Option<u32>,
  60     pub keep_stage: Option<u32>,
  61     pub src: PathBuf,
  62     pub jobs: Option<u32>,
  63     pub cmd: Subcommand,
  64     pub incremental: bool,
  65
  66     // llvm codegen options
  67     pub llvm_enabled: bool,
  68     pub llvm_assertions: bool,
  69     pub llvm_optimize: bool,
  70     pub llvm_release_debuginfo: bool,
  71     pub llvm_version_check: bool,
  72     pub llvm_static_stdcpp: bool,
  73     pub llvm_link_shared: bool,
  74     pub llvm_targets: Option<String>,
  75     pub llvm_experimental_targets: Option<String>,
  76     pub llvm_link_jobs: Option<u32>,
  77
  78     // rust codegen options
  79     pub rust_optimize: bool,
  80     pub rust_codegen_units: u32,
  81     pub rust_debug_assertions: bool,
  82     pub rust_debuginfo: bool,
  83     pub rust_debuginfo_lines: bool,
  84     pub rust_debuginfo_only_std: bool,
  85     pub rust_rpath: bool,
  86     pub rustc_default_linker: Option<String>,
  87     pub rustc_default_ar: Option<String>,
  88     pub rust_optimize_tests: bool,
  89     pub rust_debuginfo_tests: bool,
  90     pub rust_dist_src: bool,
  91
  92     pub build: Interned<String>,
  93     pub hosts: Vec<Interned<String>>,
  94     pub targets: Vec<Interned<String>>,
  95     pub local_rebuild: bool,
  96
  97     // dist misc
  98     pub dist_sign_folder: Option<PathBuf>,
  99     pub dist_upload_addr: Option<String>,
 100     pub dist_gpg_password_file: Option<PathBuf>,
 101
 102     // libstd features
 103     pub debug_jemalloc: bool,
 104     pub use_jemalloc: bool,
 105     pub backtrace: bool, // support for RUST_BACKTRACE
 106
 107     // misc
 108     pub low_priority: bool,
 109     pub channel: String,
 110     pub quiet_tests: bool,
 111     // Fallback musl-root for all targets
 112     pub musl_root: Option<PathBuf>,
 113     pub prefix: Option<PathBuf>,
 114     pub sysconfdir: Option<PathBuf>,
 115     pub docdir: Option<PathBuf>,
 116     pub bindir: Option<PathBuf>,
 117     pub libdir: Option<PathBuf>,
 118     pub libdir_relative: Option<PathBuf>,
 119     pub mandir: Option<PathBuf>,
 120     pub codegen_tests: bool,
 121     pub nodejs: Option<PathBuf>,
 122     pub gdb: Option<PathBuf>,
 123     pub python: Option<PathBuf>,
 124     pub configure_args: Vec<String>,
 125     pub openssl_static: bool,
 126
 127
 128     // These are either the stage0 downloaded binaries or the locally installed ones.
 129     pub initial_cargo: PathBuf,
 130     pub initial_rustc: PathBuf,
 131
 132 }
 133
 134 /// Per-target configuration stored in the global configuration structure.
 135 #[derive(Default)]
 136 pub struct Target {
 137     /// Some(path to llvm-config) if using an external LLVM.
 138     pub llvm_config: Option<PathBuf>,
 139     pub jemalloc: Option<PathBuf>,
 140     pub cc: Option<PathBuf>,
 141     pub cxx: Option<PathBuf>,
 142     pub ndk: Option<PathBuf>,
 143     pub musl_root: Option<PathBuf>,
 144     pub qemu_rootfs: Option<PathBuf>,
 145 }
 146
 147 /// Structure of the `config.toml` file that configuration is read from.
 148 ///
 149 /// This structure uses `Decodable` to automatically decode a TOML configuration
 150 /// file into this format, and then this is traversed and written into the above
 151 /// `Config` structure.
 152 #[derive(Deserialize, Default)]
 153 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 154 struct TomlConfig {
 155     build: Option<Build>,
 156     install: Option<Install>,
 157     llvm: Option<Llvm>,
 158     rust: Option<Rust>,
 159     target: Option<HashMap<String, TomlTarget>>,
 160     dist: Option<Dist>,
 161 }
 162
 163 /// TOML representation of various global build decisions.
 164 #[derive(Deserialize, Default, Clone)]
 165 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 166 struct Build {
 167     build: Option<String>,
 168     #[serde(default)]
 169     host: Vec<String>,
 170     #[serde(default)]
 171     target: Vec<String>,
 172     cargo: Option<String>,
 173     rustc: Option<String>,
 174     low_priority: Option<bool>,
 175     compiler_docs: Option<bool>,
 176     docs: Option<bool>,
 177     submodules: Option<bool>,
 178     gdb: Option<String>,
 179     locked_deps: Option<bool>,
 180     vendor: Option<bool>,
 181     nodejs: Option<String>,
 182     python: Option<String>,
 183     full_bootstrap: Option<bool>,
 184     extended: Option<bool>,
 185     verbose: Option<usize>,
 186     sanitizers: Option<bool>,
 187     profiler: Option<bool>,
 188     openssl_static: Option<bool>,
 189 }
 190
 191 /// TOML representation of various global install decisions.
 192 #[derive(Deserialize, Default, Clone)]
 193 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 194 struct Install {
 195     prefix: Option<String>,
 196     sysconfdir: Option<String>,
 197     docdir: Option<String>,
 198     bindir: Option<String>,
 199     libdir: Option<String>,
 200     mandir: Option<String>,
 201 }
 202
 203 /// TOML representation of how the LLVM build is configured.
 204 #[derive(Deserialize, Default)]
 205 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 206 struct Llvm {
 207     enabled: Option<bool>,
 208     ccache: Option<StringOrBool>,
 209     ninja: Option<bool>,
 210     assertions: Option<bool>,
 211     optimize: Option<bool>,
 212     release_debuginfo: Option<bool>,
 213     version_check: Option<bool>,
 214     static_libstdcpp: Option<bool>,
 215     targets: Option<String>,
 216     experimental_targets: Option<String>,
 217     link_jobs: Option<u32>,
 218 }
 219
 220 #[derive(Deserialize, Default, Clone)]
 221 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 222 struct Dist {
 223     sign_folder: Option<String>,
 224     gpg_password_file: Option<String>,
 225     upload_addr: Option<String>,
 226     src_tarball: Option<bool>,
 227 }
 228
 229 #[derive(Deserialize)]
 230 #[serde(untagged)]
 231 enum StringOrBool {
 232     String(String),
 233     Bool(bool),
 234 }
 235
 236 impl Default for StringOrBool {
 237     fn default() -> StringOrBool {
 238         StringOrBool::Bool(false)
 239     }
 240 }
 241
 242 /// TOML representation of how the Rust build is configured.
 243 #[derive(Deserialize, Default)]
 244 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 245 struct Rust {
 246     optimize: Option<bool>,
 247     codegen_units: Option<u32>,
 248     debug_assertions: Option<bool>,
 249     debuginfo: Option<bool>,
 250     debuginfo_lines: Option<bool>,
 251     debuginfo_only_std: Option<bool>,
 252     debug_jemalloc: Option<bool>,
 253     use_jemalloc: Option<bool>,
 254     backtrace: Option<bool>,
 255     default_linker: Option<String>,
 256     default_ar: Option<String>,
 257     channel: Option<String>,
 258     musl_root: Option<String>,
 259     rpath: Option<bool>,
 260     optimize_tests: Option<bool>,
 261     debuginfo_tests: Option<bool>,
 262     codegen_tests: Option<bool>,
 263 }
 264
 265 /// TOML representation of how each build target is configured.
 266 #[derive(Deserialize, Default)]
 267 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 268 struct TomlTarget {
 269     llvm_config: Option<String>,
 270     jemalloc: Option<String>,
 271     cc: Option<String>,
 272     cxx: Option<String>,
 273     android_ndk: Option<String>,
 274     musl_root: Option<String>,
 275     qemu_rootfs: Option<String>,
 276 }
 277
 278 impl Config {
 279     pub fn parse(args: &[String]) -> Config {
 280         let flags = Flags::parse(&args);
 281         let file = flags.config.clone();
 282         let mut config = Config::default();
 283         config.llvm_enabled = true;
 284         config.llvm_optimize = true;
 285         config.use_jemalloc = true;
 286         config.backtrace = true;
 287         config.rust_optimize = true;
 288         config.rust_optimize_tests = true;
 289         config.submodules = true;
 290         config.docs = true;
 291         config.rust_rpath = true;
 292         config.rust_codegen_units = 1;
 293         config.build = flags.build;
 294         config.channel = "dev".to_string();
 295         config.codegen_tests = true;
 296         config.rust_dist_src = true;
 297
 298         config.on_fail = flags.on_fail;
 299         config.stage = flags.stage;
 300         config.src = flags.src;
 301         config.jobs = flags.jobs;
 302         config.cmd = flags.cmd;
 303         config.incremental = flags.incremental;
 304         config.keep_stage = flags.keep_stage;
 305
 306         let toml = file.map(|file| {
 307             let mut f = t!(File::open(&file));
 308             let mut contents = String::new();
 309             t!(f.read_to_string(&mut contents));
 310             match toml::from_str(&contents) {
 311                 Ok(table) => table,
 312                 Err(err) => {
 313                     println!("failed to parse TOML configuration '{}': {}",
 314                         file.display(), err);
 315                     process::exit(2);
 316                 }
 317             }
 318         }).unwrap_or_else(|| TomlConfig::default());
 319
 320         let build = toml.build.clone().unwrap_or(Build::default());
 321         set(&mut config.build, build.build.clone().map(|x| INTERNER.intern_string(x)));
 322         config.hosts.push(config.build.clone());
 323         for host in build.host.iter() {
 324             let host = INTERNER.intern_str(host);
 325             if !config.hosts.contains(&host) {
 326                 config.hosts.push(host);
 327             }
 328         }
 329         for target in config.hosts.iter().cloned()
 330             .chain(build.target.iter().map(|s| INTERNER.intern_str(s)))
 331         {
 332             if !config.targets.contains(&target) {
 333                 config.targets.push(target);
 334             }
 335         }
 336         config.hosts = if !flags.host.is_empty() {
 337             flags.host
 338         } else {
 339             config.hosts
 340         };
 341         config.targets = if !flags.target.is_empty() {
 342             flags.target
 343         } else {
 344             config.targets
 345         };
 346
 347         config.nodejs = build.nodejs.map(PathBuf::from);
 348         config.gdb = build.gdb.map(PathBuf::from);
 349         config.python = build.python.map(PathBuf::from);
 350         set(&mut config.low_priority, build.low_priority);
 351         set(&mut config.compiler_docs, build.compiler_docs);
 352         set(&mut config.docs, build.docs);
 353         set(&mut config.submodules, build.submodules);
 354         set(&mut config.locked_deps, build.locked_deps);
 355         set(&mut config.vendor, build.vendor);
 356         set(&mut config.full_bootstrap, build.full_bootstrap);
 357         set(&mut config.extended, build.extended);
 358         set(&mut config.verbose, build.verbose);
 359         set(&mut config.sanitizers, build.sanitizers);
 360         set(&mut config.profiler, build.profiler);
 361         set(&mut config.openssl_static, build.openssl_static);
 362         config.verbose = cmp::max(config.verbose, flags.verbose);
 363
 364         if let Some(ref install) = toml.install {
 365             config.prefix = install.prefix.clone().map(PathBuf::from);
 366             config.sysconfdir = install.sysconfdir.clone().map(PathBuf::from);
 367             config.docdir = install.docdir.clone().map(PathBuf::from);
 368             config.bindir = install.bindir.clone().map(PathBuf::from);
 369             config.libdir = install.libdir.clone().map(PathBuf::from);
 370             config.mandir = install.mandir.clone().map(PathBuf::from);
 371         }
 372
 373         if let Some(ref llvm) = toml.llvm {
 374             match llvm.ccache {
 375                 Some(StringOrBool::String(ref s)) => {
 376                     config.ccache = Some(s.to_string())
 377                 }
 378                 Some(StringOrBool::Bool(true)) => {
 379                     config.ccache = Some("ccache".to_string());
 380                 }
 381                 Some(StringOrBool::Bool(false)) | None => {}
 382             }
 383             set(&mut config.ninja, llvm.ninja);
 384             set(&mut config.llvm_enabled, llvm.enabled);
 385             set(&mut config.llvm_assertions, llvm.assertions);
 386             set(&mut config.llvm_optimize, llvm.optimize);
 387             set(&mut config.llvm_release_debuginfo, llvm.release_debuginfo);
 388             set(&mut config.llvm_version_check, llvm.version_check);
 389             set(&mut config.llvm_static_stdcpp, llvm.static_libstdcpp);
 390             config.llvm_targets = llvm.targets.clone();
 391             config.llvm_experimental_targets = llvm.experimental_targets.clone();
 392             config.llvm_link_jobs = llvm.link_jobs;
 393         }
 394
 395         if let Some(ref rust) = toml.rust {
 396             set(&mut config.rust_debug_assertions, rust.debug_assertions);
 397             set(&mut config.rust_debuginfo, rust.debuginfo);
 398             set(&mut config.rust_debuginfo_lines, rust.debuginfo_lines);
 399             set(&mut config.rust_debuginfo_only_std, rust.debuginfo_only_std);
 400             set(&mut config.rust_optimize, rust.optimize);
 401             set(&mut config.rust_optimize_tests, rust.optimize_tests);
 402             set(&mut config.rust_debuginfo_tests, rust.debuginfo_tests);
 403             set(&mut config.codegen_tests, rust.codegen_tests);
 404             set(&mut config.rust_rpath, rust.rpath);
 405             set(&mut config.debug_jemalloc, rust.debug_jemalloc);
 406             set(&mut config.use_jemalloc, rust.use_jemalloc);
 407             set(&mut config.backtrace, rust.backtrace);
 408             set(&mut config.channel, rust.channel.clone());
 409             config.rustc_default_linker = rust.default_linker.clone();
 410             config.rustc_default_ar = rust.default_ar.clone();
 411             config.musl_root = rust.musl_root.clone().map(PathBuf::from);
 412
 413             match rust.codegen_units {
 414                 Some(0) => config.rust_codegen_units = num_cpus::get() as u32,
 415                 Some(n) => config.rust_codegen_units = n,
 416                 None => {}
 417             }
 418         }
 419
 420         if let Some(ref t) = toml.target {
 421             for (triple, cfg) in t {
 422                 let mut target = Target::default();
 423
 424                 if let Some(ref s) = cfg.llvm_config {
 425                     target.llvm_config = Some(env::current_dir().unwrap().join(s));
 426                 }
 427                 if let Some(ref s) = cfg.jemalloc {
 428                     target.jemalloc = Some(env::current_dir().unwrap().join(s));
 429                 }
 430                 if let Some(ref s) = cfg.android_ndk {
 431                     target.ndk = Some(env::current_dir().unwrap().join(s));
 432                 }
 433                 target.cxx = cfg.cxx.clone().map(PathBuf::from);
 434                 target.cc = cfg.cc.clone().map(PathBuf::from);
 435                 target.musl_root = cfg.musl_root.clone().map(PathBuf::from);
 436                 target.qemu_rootfs = cfg.qemu_rootfs.clone().map(PathBuf::from);
 437
 438                 config.target_config.insert(INTERNER.intern_string(triple.clone()), target);
 439             }
 440         }
 441
 442         if let Some(ref t) = toml.dist {
 443             config.dist_sign_folder = t.sign_folder.clone().map(PathBuf::from);
 444             config.dist_gpg_password_file = t.gpg_password_file.clone().map(PathBuf::from);
 445             config.dist_upload_addr = t.upload_addr.clone();
 446             set(&mut config.rust_dist_src, t.src_tarball);
 447         }
 448
 449         let cwd = t!(env::current_dir());
 450         let out = cwd.join("build");
 451
 452         let stage0_root = out.join(&config.build).join("stage0/bin");
 453         config.initial_rustc = match build.rustc {
 454             Some(s) => PathBuf::from(s),
 455             None => stage0_root.join(exe("rustc", &config.build)),
 456         };
 457         config.initial_cargo = match build.cargo {
 458             Some(s) => PathBuf::from(s),
 459             None => stage0_root.join(exe("cargo", &config.build)),
 460         };
 461
 462         // compat with `./configure` while we're still using that
 463         if fs::metadata("config.mk").is_ok() {
 464             config.update_with_config_mk();
 465         }
 466
 467         config
 468     }
 469
 470     /// "Temporary" routine to parse `config.mk` into this configuration.
 471     ///
 472     /// While we still have `./configure` this implements the ability to decode
 473     /// that configuration into this. This isn't exactly a full-blown makefile
 474     /// parser, but hey it gets the job done!
 475     fn update_with_config_mk(&mut self) {
 476         let mut config = String::new();
 477         File::open("config.mk").unwrap().read_to_string(&mut config).unwrap();
 478         for line in config.lines() {
 479             let mut parts = line.splitn(2, ":=").map(|s| s.trim());
 480             let key = parts.next().unwrap();
 481             let value = match parts.next() {
 482                 Some(n) if n.starts_with('\"') => &n[1..n.len() - 1],
 483                 Some(n) => n,
 484                 None => continue
 485             };
 486
 487             macro_rules! check {
 488                 ($(($name:expr, $val:expr),)*) => {
 489                     if value == "1" {
 490                         $(
 491                             if key == concat!("CFG_ENABLE_", $name) {
 492                                 $val = true;
 493                                 continue
 494                             }
 495                             if key == concat!("CFG_DISABLE_", $name) {
 496                                 $val = false;
 497                                 continue
 498                             }
 499                         )*
 500                     }
 501                 }
 502             }
 503
 504             check! {
 505                 ("MANAGE_SUBMODULES", self.submodules),
 506                 ("COMPILER_DOCS", self.compiler_docs),
 507                 ("DOCS", self.docs),
 508                 ("LLVM_ASSERTIONS", self.llvm_assertions),
 509                 ("LLVM_RELEASE_DEBUGINFO", self.llvm_release_debuginfo),
 510                 ("OPTIMIZE_LLVM", self.llvm_optimize),
 511                 ("LLVM_VERSION_CHECK", self.llvm_version_check),
 512                 ("LLVM_STATIC_STDCPP", self.llvm_static_stdcpp),
 513                 ("LLVM_LINK_SHARED", self.llvm_link_shared),
 514                 ("OPTIMIZE", self.rust_optimize),
 515                 ("DEBUG_ASSERTIONS", self.rust_debug_assertions),
 516                 ("DEBUGINFO", self.rust_debuginfo),
 517                 ("DEBUGINFO_LINES", self.rust_debuginfo_lines),
 518                 ("DEBUGINFO_ONLY_STD", self.rust_debuginfo_only_std),
 519                 ("JEMALLOC", self.use_jemalloc),
 520                 ("DEBUG_JEMALLOC", self.debug_jemalloc),
 521                 ("RPATH", self.rust_rpath),
 522                 ("OPTIMIZE_TESTS", self.rust_optimize_tests),
 523                 ("DEBUGINFO_TESTS", self.rust_debuginfo_tests),
 524                 ("QUIET_TESTS", self.quiet_tests),
 525                 ("LOCAL_REBUILD", self.local_rebuild),
 526                 ("NINJA", self.ninja),
 527                 ("CODEGEN_TESTS", self.codegen_tests),
 528                 ("LOCKED_DEPS", self.locked_deps),
 529                 ("VENDOR", self.vendor),
 530                 ("FULL_BOOTSTRAP", self.full_bootstrap),
 531                 ("EXTENDED", self.extended),
 532                 ("SANITIZERS", self.sanitizers),
 533                 ("PROFILER", self.profiler),
 534                 ("DIST_SRC", self.rust_dist_src),
 535                 ("CARGO_OPENSSL_STATIC", self.openssl_static),
 536             }
 537
 538             match key {
 539                 "CFG_BUILD" if value.len() > 0 => self.build = INTERNER.intern_str(value),
 540                 "CFG_HOST" if value.len() > 0 => {
 541                     self.hosts.extend(value.split(" ").map(|s| INTERNER.intern_str(s)));
 542
 543                 }
 544                 "CFG_TARGET" if value.len() > 0 => {
 545                     self.targets.extend(value.split(" ").map(|s| INTERNER.intern_str(s)));
 546                 }
 547                 "CFG_EXPERIMENTAL_TARGETS" if value.len() > 0 => {
 548                     self.llvm_experimental_targets = Some(value.to_string());
 549                 }
 550                 "CFG_MUSL_ROOT" if value.len() > 0 => {
 551                     self.musl_root = Some(parse_configure_path(value));
 552                 }
 553                 "CFG_MUSL_ROOT_X86_64" if value.len() > 0 => {
 554                     let target = INTERNER.intern_str("x86_64-unknown-linux-musl");
 555                     let target = self.target_config.entry(target).or_insert(Target::default());
 556                     target.musl_root = Some(parse_configure_path(value));
 557                 }
 558                 "CFG_MUSL_ROOT_I686" if value.len() > 0 => {
 559                     let target = INTERNER.intern_str("i686-unknown-linux-musl");
 560                     let target = self.target_config.entry(target).or_insert(Target::default());
 561                     target.musl_root = Some(parse_configure_path(value));
 562                 }
 563                 "CFG_MUSL_ROOT_ARM" if value.len() > 0 => {
 564                     let target = INTERNER.intern_str("arm-unknown-linux-musleabi");
 565                     let target = self.target_config.entry(target).or_insert(Target::default());
 566                     target.musl_root = Some(parse_configure_path(value));
 567                 }
 568                 "CFG_MUSL_ROOT_ARMHF" if value.len() > 0 => {
 569                     let target = INTERNER.intern_str("arm-unknown-linux-musleabihf");
 570                     let target = self.target_config.entry(target).or_insert(Target::default());
 571                     target.musl_root = Some(parse_configure_path(value));
 572                 }
 573                 "CFG_MUSL_ROOT_ARMV7" if value.len() > 0 => {
 574                     let target = INTERNER.intern_str("armv7-unknown-linux-musleabihf");
 575                     let target = self.target_config.entry(target).or_insert(Target::default());
 576                     target.musl_root = Some(parse_configure_path(value));
 577                 }
 578                 "CFG_DEFAULT_AR" if value.len() > 0 => {
 579                     self.rustc_default_ar = Some(value.to_string());
 580                 }
 581                 "CFG_DEFAULT_LINKER" if value.len() > 0 => {
 582                     self.rustc_default_linker = Some(value.to_string());
 583                 }
 584                 "CFG_GDB" if value.len() > 0 => {
 585                     self.gdb = Some(parse_configure_path(value));
 586                 }
 587                 "CFG_RELEASE_CHANNEL" => {
 588                     self.channel = value.to_string();
 589                 }
 590                 "CFG_PREFIX" => {
 591                     self.prefix = Some(PathBuf::from(value));
 592                 }
 593                 "CFG_SYSCONFDIR" => {
 594                     self.sysconfdir = Some(PathBuf::from(value));
 595                 }
 596                 "CFG_DOCDIR" => {
 597                     self.docdir = Some(PathBuf::from(value));
 598                 }
 599                 "CFG_BINDIR" => {
 600                     self.bindir = Some(PathBuf::from(value));
 601                 }
 602                 "CFG_LIBDIR" => {
 603                     self.libdir = Some(PathBuf::from(value));
 604                 }
 605                 "CFG_LIBDIR_RELATIVE" => {
 606                     self.libdir_relative = Some(PathBuf::from(value));
 607                 }
 608                 "CFG_MANDIR" => {
 609                     self.mandir = Some(PathBuf::from(value));
 610                 }
 611                 "CFG_LLVM_ROOT" if value.len() > 0 => {
 612                     let target = self.target_config.entry(self.build.clone())
 613                                      .or_insert(Target::default());
 614                     let root = parse_configure_path(value);
 615                     target.llvm_config = Some(push_exe_path(root, &["bin", "llvm-config"]));
 616                 }
 617                 "CFG_JEMALLOC_ROOT" if value.len() > 0 => {
 618                     let target = self.target_config.entry(self.build.clone())
 619                                      .or_insert(Target::default());
 620                     target.jemalloc = Some(parse_configure_path(value).join("libjemalloc_pic.a"));
 621                 }
 622                 "CFG_ARM_LINUX_ANDROIDEABI_NDK" if value.len() > 0 => {
 623                     let target = INTERNER.intern_str("arm-linux-androideabi");
 624                     let target = self.target_config.entry(target).or_insert(Target::default());
 625                     target.ndk = Some(parse_configure_path(value));
 626                 }
 627                 "CFG_ARMV7_LINUX_ANDROIDEABI_NDK" if value.len() > 0 => {
 628                     let target = INTERNER.intern_str("armv7-linux-androideabi");
 629                     let target = self.target_config.entry(target).or_insert(Target::default());
 630                     target.ndk = Some(parse_configure_path(value));
 631                 }
 632                 "CFG_I686_LINUX_ANDROID_NDK" if value.len() > 0 => {
 633                     let target = INTERNER.intern_str("i686-linux-android");
 634                     let target = self.target_config.entry(target).or_insert(Target::default());
 635                     target.ndk = Some(parse_configure_path(value));
 636                 }
 637                 "CFG_AARCH64_LINUX_ANDROID_NDK" if value.len() > 0 => {
 638                     let target = INTERNER.intern_str("aarch64-linux-android");
 639                     let target = self.target_config.entry(target).or_insert(Target::default());
 640                     target.ndk = Some(parse_configure_path(value));
 641                 }
 642                 "CFG_X86_64_LINUX_ANDROID_NDK" if value.len() > 0 => {
 643                     let target = INTERNER.intern_str("x86_64-linux-android");
 644                     let target = self.target_config.entry(target).or_insert(Target::default());
 645                     target.ndk = Some(parse_configure_path(value));
 646                 }
 647                 "CFG_LOCAL_RUST_ROOT" if value.len() > 0 => {
 648                     let path = parse_configure_path(value);
 649                     self.initial_rustc = push_exe_path(path.clone(), &["bin", "rustc"]);
 650                     self.initial_cargo = push_exe_path(path, &["bin", "cargo"]);
 651                 }
 652                 "CFG_PYTHON" if value.len() > 0 => {
 653                     let path = parse_configure_path(value);
 654                     self.python = Some(path);
 655                 }
 656                 "CFG_ENABLE_CCACHE" if value == "1" => {
 657                     self.ccache = Some(exe("ccache", &self.build));
 658                 }
 659                 "CFG_ENABLE_SCCACHE" if value == "1" => {
 660                     self.ccache = Some(exe("sccache", &self.build));
 661                 }
 662                 "CFG_CONFIGURE_ARGS" if value.len() > 0 => {
 663                     self.configure_args = value.split_whitespace()
 664                                                .map(|s| s.to_string())
 665                                                .collect();
 666                 }
 667                 "CFG_QEMU_ARMHF_ROOTFS" if value.len() > 0 => {
 668                     let target = INTERNER.intern_str("arm-unknown-linux-gnueabihf");
 669                     let target = self.target_config.entry(target).or_insert(Target::default());
 670                     target.qemu_rootfs = Some(parse_configure_path(value));
 671                 }
 672                 "CFG_QEMU_AARCH64_ROOTFS" if value.len() > 0 => {
 673                     let target = INTERNER.intern_str("aarch64-unknown-linux-gnu");
 674                     let target = self.target_config.entry(target).or_insert(Target::default());
 675                     target.qemu_rootfs = Some(parse_configure_path(value));
 676                 }
 677                 _ => {}
 678             }
 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
 691 #[cfg(not(windows))]
 692 fn parse_configure_path(path: &str) -> PathBuf {
 693     path.into()
 694 }
 695
 696 #[cfg(windows)]
 697 fn parse_configure_path(path: &str) -> PathBuf {
 698     // on windows, configure produces unix style paths e.g. /c/some/path but we
 699     // only want real windows paths
 700
 701     use std::process::Command;
 702     use build_helper;
 703
 704     // '/' is invalid in windows paths, so we can detect unix paths by the presence of it
 705     if !path.contains('/') {
 706         return path.into();
 707     }
 708
 709     let win_path = build_helper::output(Command::new("cygpath").arg("-w").arg(path));
 710     let win_path = win_path.trim();
 711
 712     win_path.into()
 713 }
 714
 715 fn set<T>(field: &mut T, val: Option<T>) {
 716     if let Some(v) = val {
 717         *field = v;
 718     }
 719 }