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
  23 use num_cpus;
  24 use toml;
  25 use util::{exe, push_exe_path};
  26 use cache::{INTERNER, Interned};
  27
  28 /// Global configuration for the entire build and/or bootstrap.
  29 ///
  30 /// This structure is derived from a combination of both `config.toml` and
  31 /// `config.mk`. As of the time of this writing it's unlikely that `config.toml`
  32 /// is used all that much, so this is primarily filled out by `config.mk` which
  33 /// is generated from `./configure`.
  34 ///
  35 /// Note that this structure is not decoded directly into, but rather it is
  36 /// filled out from the decoded forms of the structs below. For documentation
  37 /// each field, see the corresponding fields in
  38 /// `src/bootstrap/config.toml.example`.
  39 #[derive(Default)]
  40 pub struct Config {
  41     pub ccache: Option<String>,
  42     pub ninja: bool,
  43     pub verbose: usize,
  44     pub submodules: bool,
  45     pub compiler_docs: bool,
  46     pub docs: bool,
  47     pub locked_deps: bool,
  48     pub vendor: bool,
  49     pub target_config: HashMap<Interned<String>, Target>,
  50     pub full_bootstrap: bool,
  51     pub extended: bool,
  52     pub sanitizers: bool,
  53     pub profiler: bool,
  54
  55     // llvm codegen options
  56     pub llvm_assertions: bool,
  57     pub llvm_optimize: bool,
  58     pub llvm_release_debuginfo: bool,
  59     pub llvm_version_check: bool,
  60     pub llvm_static_stdcpp: bool,
  61     pub llvm_link_shared: bool,
  62     pub llvm_targets: Option<String>,
  63     pub llvm_experimental_targets: Option<String>,
  64     pub llvm_link_jobs: Option<u32>,
  65     pub llvm_clean_rebuild: bool,
  66
  67     // rust codegen options
  68     pub rust_optimize: bool,
  69     pub rust_codegen_units: u32,
  70     pub rust_debug_assertions: bool,
  71     pub rust_debuginfo: bool,
  72     pub rust_debuginfo_lines: bool,
  73     pub rust_debuginfo_only_std: bool,
  74     pub rust_rpath: bool,
  75     pub rustc_default_linker: Option<String>,
  76     pub rustc_default_ar: Option<String>,
  77     pub rust_optimize_tests: bool,
  78     pub rust_debuginfo_tests: bool,
  79     pub rust_dist_src: bool,
  80
  81     pub build: Interned<String>,
  82     pub host: Vec<Interned<String>>,
  83     pub target: Vec<Interned<String>>,
  84     pub local_rebuild: bool,
  85
  86     // dist misc
  87     pub dist_sign_folder: Option<PathBuf>,
  88     pub dist_upload_addr: Option<String>,
  89     pub dist_gpg_password_file: Option<PathBuf>,
  90
  91     // libstd features
  92     pub debug_jemalloc: bool,
  93     pub use_jemalloc: bool,
  94     pub backtrace: bool, // support for RUST_BACKTRACE
  95
  96     // misc
  97     pub low_priority: bool,
  98     pub channel: String,
  99     pub quiet_tests: bool,
 100     // Fallback musl-root for all targets
 101     pub musl_root: Option<PathBuf>,
 102     pub prefix: Option<PathBuf>,
 103     pub sysconfdir: Option<PathBuf>,
 104     pub docdir: Option<PathBuf>,
 105     pub bindir: Option<PathBuf>,
 106     pub libdir: Option<PathBuf>,
 107     pub libdir_relative: Option<PathBuf>,
 108     pub mandir: Option<PathBuf>,
 109     pub codegen_tests: bool,
 110     pub nodejs: Option<PathBuf>,
 111     pub gdb: Option<PathBuf>,
 112     pub python: Option<PathBuf>,
 113     pub configure_args: Vec<String>,
 114     pub openssl_static: bool,
 115
 116
 117     // These are either the stage0 downloaded binaries or the locally installed ones.
 118     pub initial_cargo: PathBuf,
 119     pub initial_rustc: PathBuf,
 120
 121 }
 122
 123 /// Per-target configuration stored in the global configuration structure.
 124 #[derive(Default)]
 125 pub struct Target {
 126     /// Some(path to llvm-config) if using an external LLVM.
 127     pub llvm_config: Option<PathBuf>,
 128     pub jemalloc: Option<PathBuf>,
 129     pub cc: Option<PathBuf>,
 130     pub cxx: Option<PathBuf>,
 131     pub ndk: Option<PathBuf>,
 132     pub musl_root: Option<PathBuf>,
 133     pub qemu_rootfs: Option<PathBuf>,
 134 }
 135
 136 /// Structure of the `config.toml` file that configuration is read from.
 137 ///
 138 /// This structure uses `Decodable` to automatically decode a TOML configuration
 139 /// file into this format, and then this is traversed and written into the above
 140 /// `Config` structure.
 141 #[derive(Deserialize, Default)]
 142 #[serde(deny_unknown_fields)]
 143 #[serde(rename_all = "kebab-case")]
 144 struct TomlConfig {
 145     build: Option<Build>,
 146     install: Option<Install>,
 147     llvm: Option<Llvm>,
 148     rust: Option<Rust>,
 149     target: Option<HashMap<String, TomlTarget>>,
 150     dist: Option<Dist>,
 151 }
 152
 153 /// TOML representation of various global build decisions.
 154 #[derive(Deserialize, Default, Clone)]
 155 #[serde(deny_unknown_fields)]
 156 #[serde(rename_all = "kebab-case")]
 157 struct Build {
 158     build: Option<String>,
 159     #[serde(default)]
 160     host: Vec<String>,
 161     #[serde(default)]
 162     target: Vec<String>,
 163     cargo: Option<String>,
 164     rustc: Option<String>,
 165     low_priority: Option<bool>,
 166     compiler_docs: Option<bool>,
 167     docs: Option<bool>,
 168     submodules: Option<bool>,
 169     gdb: Option<String>,
 170     locked_deps: Option<bool>,
 171     vendor: Option<bool>,
 172     nodejs: Option<String>,
 173     python: Option<String>,
 174     full_bootstrap: Option<bool>,
 175     extended: Option<bool>,
 176     verbose: Option<usize>,
 177     sanitizers: Option<bool>,
 178     profiler: Option<bool>,
 179     openssl_static: Option<bool>,
 180 }
 181
 182 /// TOML representation of various global install decisions.
 183 #[derive(Deserialize, Default, Clone)]
 184 #[serde(deny_unknown_fields)]
 185 #[serde(rename_all = "kebab-case")]
 186 struct Install {
 187     prefix: Option<String>,
 188     sysconfdir: Option<String>,
 189     docdir: Option<String>,
 190     bindir: Option<String>,
 191     libdir: Option<String>,
 192     mandir: Option<String>,
 193 }
 194
 195 /// TOML representation of how the LLVM build is configured.
 196 #[derive(Deserialize, Default)]
 197 #[serde(deny_unknown_fields)]
 198 #[serde(rename_all = "kebab-case")]
 199 struct Llvm {
 200     ccache: Option<StringOrBool>,
 201     ninja: Option<bool>,
 202     assertions: Option<bool>,
 203     optimize: Option<bool>,
 204     release_debuginfo: Option<bool>,
 205     version_check: Option<bool>,
 206     static_libstdcpp: Option<bool>,
 207     targets: Option<String>,
 208     experimental_targets: Option<String>,
 209     link_jobs: Option<u32>,
 210     clean_rebuild: Option<bool>,
 211 }
 212
 213 #[derive(Deserialize, Default, Clone)]
 214 #[serde(deny_unknown_fields)]
 215 #[serde(rename_all = "kebab-case")]
 216 struct Dist {
 217     sign_folder: Option<String>,
 218     gpg_password_file: Option<String>,
 219     upload_addr: Option<String>,
 220     src_tarball: Option<bool>,
 221 }
 222
 223 #[derive(Deserialize)]
 224 #[serde(untagged)]
 225 enum StringOrBool {
 226     String(String),
 227     Bool(bool),
 228 }
 229
 230 impl Default for StringOrBool {
 231     fn default() -> StringOrBool {
 232         StringOrBool::Bool(false)
 233     }
 234 }
 235
 236 /// TOML representation of how the Rust build is configured.
 237 #[derive(Deserialize, Default)]
 238 #[serde(deny_unknown_fields)]
 239 #[serde(rename_all = "kebab-case")]
 240 struct Rust {
 241     optimize: Option<bool>,
 242     codegen_units: Option<u32>,
 243     debug_assertions: Option<bool>,
 244     debuginfo: Option<bool>,
 245     debuginfo_lines: Option<bool>,
 246     debuginfo_only_std: Option<bool>,
 247     debug_jemalloc: Option<bool>,
 248     use_jemalloc: Option<bool>,
 249     backtrace: Option<bool>,
 250     default_linker: Option<String>,
 251     default_ar: Option<String>,
 252     channel: Option<String>,
 253     musl_root: Option<String>,
 254     rpath: Option<bool>,
 255     optimize_tests: Option<bool>,
 256     debuginfo_tests: Option<bool>,
 257     codegen_tests: Option<bool>,
 258 }
 259
 260 /// TOML representation of how each build target is configured.
 261 #[derive(Deserialize, Default)]
 262 #[serde(deny_unknown_fields)]
 263 #[serde(rename_all = "kebab-case")]
 264 struct TomlTarget {
 265     llvm_config: Option<String>,
 266     jemalloc: Option<String>,
 267     cc: Option<String>,
 268     cxx: Option<String>,
 269     android_ndk: Option<String>,
 270     musl_root: Option<String>,
 271     qemu_rootfs: Option<String>,
 272 }
 273
 274 impl Config {
 275     pub fn parse(build: &str, file: Option<PathBuf>) -> Config {
 276         let mut config = Config::default();
 277         config.llvm_optimize = true;
 278         config.use_jemalloc = true;
 279         config.backtrace = true;
 280         config.rust_optimize = true;
 281         config.rust_optimize_tests = true;
 282         config.submodules = true;
 283         config.docs = true;
 284         config.rust_rpath = true;
 285         config.rust_codegen_units = 1;
 286         config.build = INTERNER.intern_str(build);
 287         config.channel = "dev".to_string();
 288         config.codegen_tests = true;
 289         config.rust_dist_src = true;
 290
 291         let toml = file.map(|file| {
 292             let mut f = t!(File::open(&file));
 293             let mut contents = String::new();
 294             t!(f.read_to_string(&mut contents));
 295             match toml::from_str(&contents) {
 296                 Ok(table) => table,
 297                 Err(err) => {
 298                     println!("failed to parse TOML configuration '{}': {}",
 299                         file.display(), err);
 300                     process::exit(2);
 301                 }
 302             }
 303         }).unwrap_or_else(|| TomlConfig::default());
 304
 305         let build = toml.build.clone().unwrap_or(Build::default());
 306         set(&mut config.build, build.build.clone().map(|x| INTERNER.intern_string(x)));
 307         config.host.push(config.build.clone());
 308         for host in build.host.iter() {
 309             let host = INTERNER.intern_str(host);
 310             if !config.host.contains(&host) {
 311                 config.host.push(host);
 312             }
 313         }
 314         for target in config.host.iter().cloned()
 315             .chain(build.target.iter().map(|s| INTERNER.intern_str(s)))
 316         {
 317             if !config.target.contains(&target) {
 318                 config.target.push(target);
 319             }
 320         }
 321         config.nodejs = build.nodejs.map(PathBuf::from);
 322         config.gdb = build.gdb.map(PathBuf::from);
 323         config.python = build.python.map(PathBuf::from);
 324         set(&mut config.low_priority, build.low_priority);
 325         set(&mut config.compiler_docs, build.compiler_docs);
 326         set(&mut config.docs, build.docs);
 327         set(&mut config.submodules, build.submodules);
 328         set(&mut config.locked_deps, build.locked_deps);
 329         set(&mut config.vendor, build.vendor);
 330         set(&mut config.full_bootstrap, build.full_bootstrap);
 331         set(&mut config.extended, build.extended);
 332         set(&mut config.verbose, build.verbose);
 333         set(&mut config.sanitizers, build.sanitizers);
 334         set(&mut config.profiler, build.profiler);
 335         set(&mut config.openssl_static, build.openssl_static);
 336
 337         if let Some(ref install) = toml.install {
 338             config.prefix = install.prefix.clone().map(PathBuf::from);
 339             config.sysconfdir = install.sysconfdir.clone().map(PathBuf::from);
 340             config.docdir = install.docdir.clone().map(PathBuf::from);
 341             config.bindir = install.bindir.clone().map(PathBuf::from);
 342             config.libdir = install.libdir.clone().map(PathBuf::from);
 343             config.mandir = install.mandir.clone().map(PathBuf::from);
 344         }
 345
 346         if let Some(ref llvm) = toml.llvm {
 347             match llvm.ccache {
 348                 Some(StringOrBool::String(ref s)) => {
 349                     config.ccache = Some(s.to_string())
 350                 }
 351                 Some(StringOrBool::Bool(true)) => {
 352                     config.ccache = Some("ccache".to_string());
 353                 }
 354                 Some(StringOrBool::Bool(false)) | None => {}
 355             }
 356             set(&mut config.ninja, llvm.ninja);
 357             set(&mut config.llvm_assertions, llvm.assertions);
 358             set(&mut config.llvm_optimize, llvm.optimize);
 359             set(&mut config.llvm_release_debuginfo, llvm.release_debuginfo);
 360             set(&mut config.llvm_version_check, llvm.version_check);
 361             set(&mut config.llvm_static_stdcpp, llvm.static_libstdcpp);
 362             set(&mut config.llvm_clean_rebuild, llvm.clean_rebuild);
 363             config.llvm_targets = llvm.targets.clone();
 364             config.llvm_experimental_targets = llvm.experimental_targets.clone();
 365             config.llvm_link_jobs = llvm.link_jobs;
 366         }
 367
 368         if let Some(ref rust) = toml.rust {
 369             set(&mut config.rust_debug_assertions, rust.debug_assertions);
 370             set(&mut config.rust_debuginfo, rust.debuginfo);
 371             set(&mut config.rust_debuginfo_lines, rust.debuginfo_lines);
 372             set(&mut config.rust_debuginfo_only_std, rust.debuginfo_only_std);
 373             set(&mut config.rust_optimize, rust.optimize);
 374             set(&mut config.rust_optimize_tests, rust.optimize_tests);
 375             set(&mut config.rust_debuginfo_tests, rust.debuginfo_tests);
 376             set(&mut config.codegen_tests, rust.codegen_tests);
 377             set(&mut config.rust_rpath, rust.rpath);
 378             set(&mut config.debug_jemalloc, rust.debug_jemalloc);
 379             set(&mut config.use_jemalloc, rust.use_jemalloc);
 380             set(&mut config.backtrace, rust.backtrace);
 381             set(&mut config.channel, rust.channel.clone());
 382             config.rustc_default_linker = rust.default_linker.clone();
 383             config.rustc_default_ar = rust.default_ar.clone();
 384             config.musl_root = rust.musl_root.clone().map(PathBuf::from);
 385
 386             match rust.codegen_units {
 387                 Some(0) => config.rust_codegen_units = num_cpus::get() as u32,
 388                 Some(n) => config.rust_codegen_units = n,
 389                 None => {}
 390             }
 391         }
 392
 393         if let Some(ref t) = toml.target {
 394             for (triple, cfg) in t {
 395                 let mut target = Target::default();
 396
 397                 if let Some(ref s) = cfg.llvm_config {
 398                     target.llvm_config = Some(env::current_dir().unwrap().join(s));
 399                 }
 400                 if let Some(ref s) = cfg.jemalloc {
 401                     target.jemalloc = Some(env::current_dir().unwrap().join(s));
 402                 }
 403                 if let Some(ref s) = cfg.android_ndk {
 404                     target.ndk = Some(env::current_dir().unwrap().join(s));
 405                 }
 406                 target.cxx = cfg.cxx.clone().map(PathBuf::from);
 407                 target.cc = cfg.cc.clone().map(PathBuf::from);
 408                 target.musl_root = cfg.musl_root.clone().map(PathBuf::from);
 409                 target.qemu_rootfs = cfg.qemu_rootfs.clone().map(PathBuf::from);
 410
 411                 config.target_config.insert(INTERNER.intern_string(triple.clone()), target);
 412             }
 413         }
 414
 415         if let Some(ref t) = toml.dist {
 416             config.dist_sign_folder = t.sign_folder.clone().map(PathBuf::from);
 417             config.dist_gpg_password_file = t.gpg_password_file.clone().map(PathBuf::from);
 418             config.dist_upload_addr = t.upload_addr.clone();
 419             set(&mut config.rust_dist_src, t.src_tarball);
 420         }
 421
 422         let cwd = t!(env::current_dir());
 423         let out = cwd.join("build");
 424
 425         let stage0_root = out.join(&config.build).join("stage0/bin");
 426         config.initial_rustc = match build.rustc {
 427             Some(s) => PathBuf::from(s),
 428             None => stage0_root.join(exe("rustc", &config.build)),
 429         };
 430         config.initial_cargo = match build.cargo {
 431             Some(s) => PathBuf::from(s),
 432             None => stage0_root.join(exe("cargo", &config.build)),
 433         };
 434
 435         // compat with `./configure` while we're still using that
 436         if fs::metadata("config.mk").is_ok() {
 437             config.update_with_config_mk();
 438         }
 439
 440         config
 441     }
 442
 443     /// "Temporary" routine to parse `config.mk` into this configuration.
 444     ///
 445     /// While we still have `./configure` this implements the ability to decode
 446     /// that configuration into this. This isn't exactly a full-blown makefile
 447     /// parser, but hey it gets the job done!
 448     fn update_with_config_mk(&mut self) {
 449         let mut config = String::new();
 450         File::open("config.mk").unwrap().read_to_string(&mut config).unwrap();
 451         for line in config.lines() {
 452             let mut parts = line.splitn(2, ":=").map(|s| s.trim());
 453             let key = parts.next().unwrap();
 454             let value = match parts.next() {
 455                 Some(n) if n.starts_with('\"') => &n[1..n.len() - 1],
 456                 Some(n) => n,
 457                 None => continue
 458             };
 459
 460             macro_rules! check {
 461                 ($(($name:expr, $val:expr),)*) => {
 462                     if value == "1" {
 463                         $(
 464                             if key == concat!("CFG_ENABLE_", $name) {
 465                                 $val = true;
 466                                 continue
 467                             }
 468                             if key == concat!("CFG_DISABLE_", $name) {
 469                                 $val = false;
 470                                 continue
 471                             }
 472                         )*
 473                     }
 474                 }
 475             }
 476
 477             check! {
 478                 ("MANAGE_SUBMODULES", self.submodules),
 479                 ("COMPILER_DOCS", self.compiler_docs),
 480                 ("DOCS", self.docs),
 481                 ("LLVM_ASSERTIONS", self.llvm_assertions),
 482                 ("LLVM_RELEASE_DEBUGINFO", self.llvm_release_debuginfo),
 483                 ("OPTIMIZE_LLVM", self.llvm_optimize),
 484                 ("LLVM_VERSION_CHECK", self.llvm_version_check),
 485                 ("LLVM_STATIC_STDCPP", self.llvm_static_stdcpp),
 486                 ("LLVM_LINK_SHARED", self.llvm_link_shared),
 487                 ("LLVM_CLEAN_REBUILD", self.llvm_clean_rebuild),
 488                 ("OPTIMIZE", self.rust_optimize),
 489                 ("DEBUG_ASSERTIONS", self.rust_debug_assertions),
 490                 ("DEBUGINFO", self.rust_debuginfo),
 491                 ("DEBUGINFO_LINES", self.rust_debuginfo_lines),
 492                 ("DEBUGINFO_ONLY_STD", self.rust_debuginfo_only_std),
 493                 ("JEMALLOC", self.use_jemalloc),
 494                 ("DEBUG_JEMALLOC", self.debug_jemalloc),
 495                 ("RPATH", self.rust_rpath),
 496                 ("OPTIMIZE_TESTS", self.rust_optimize_tests),
 497                 ("DEBUGINFO_TESTS", self.rust_debuginfo_tests),
 498                 ("QUIET_TESTS", self.quiet_tests),
 499                 ("LOCAL_REBUILD", self.local_rebuild),
 500                 ("NINJA", self.ninja),
 501                 ("CODEGEN_TESTS", self.codegen_tests),
 502                 ("LOCKED_DEPS", self.locked_deps),
 503                 ("VENDOR", self.vendor),
 504                 ("FULL_BOOTSTRAP", self.full_bootstrap),
 505                 ("EXTENDED", self.extended),
 506                 ("SANITIZERS", self.sanitizers),
 507                 ("PROFILER", self.profiler),
 508                 ("DIST_SRC", self.rust_dist_src),
 509                 ("CARGO_OPENSSL_STATIC", self.openssl_static),
 510             }
 511
 512             match key {
 513                 "CFG_BUILD" if value.len() > 0 => self.build = INTERNER.intern_str(value),
 514                 "CFG_HOST" if value.len() > 0 => {
 515                     self.host.extend(value.split(" ").map(|s| INTERNER.intern_str(s)));
 516
 517                 }
 518                 "CFG_TARGET" if value.len() > 0 => {
 519                     self.target.extend(value.split(" ").map(|s| INTERNER.intern_str(s)));
 520                 }
 521                 "CFG_EXPERIMENTAL_TARGETS" if value.len() > 0 => {
 522                     self.llvm_experimental_targets = Some(value.to_string());
 523                 }
 524                 "CFG_MUSL_ROOT" if value.len() > 0 => {
 525                     self.musl_root = Some(parse_configure_path(value));
 526                 }
 527                 "CFG_MUSL_ROOT_X86_64" if value.len() > 0 => {
 528                     let target = INTERNER.intern_str("x86_64-unknown-linux-musl");
 529                     let target = self.target_config.entry(target).or_insert(Target::default());
 530                     target.musl_root = Some(parse_configure_path(value));
 531                 }
 532                 "CFG_MUSL_ROOT_I686" if value.len() > 0 => {
 533                     let target = INTERNER.intern_str("i686-unknown-linux-musl");
 534                     let target = self.target_config.entry(target).or_insert(Target::default());
 535                     target.musl_root = Some(parse_configure_path(value));
 536                 }
 537                 "CFG_MUSL_ROOT_ARM" if value.len() > 0 => {
 538                     let target = INTERNER.intern_str("arm-unknown-linux-musleabi");
 539                     let target = self.target_config.entry(target).or_insert(Target::default());
 540                     target.musl_root = Some(parse_configure_path(value));
 541                 }
 542                 "CFG_MUSL_ROOT_ARMHF" if value.len() > 0 => {
 543                     let target = INTERNER.intern_str("arm-unknown-linux-musleabihf");
 544                     let target = self.target_config.entry(target).or_insert(Target::default());
 545                     target.musl_root = Some(parse_configure_path(value));
 546                 }
 547                 "CFG_MUSL_ROOT_ARMV7" if value.len() > 0 => {
 548                     let target = INTERNER.intern_str("armv7-unknown-linux-musleabihf");
 549                     let target = self.target_config.entry(target).or_insert(Target::default());
 550                     target.musl_root = Some(parse_configure_path(value));
 551                 }
 552                 "CFG_DEFAULT_AR" if value.len() > 0 => {
 553                     self.rustc_default_ar = Some(value.to_string());
 554                 }
 555                 "CFG_DEFAULT_LINKER" if value.len() > 0 => {
 556                     self.rustc_default_linker = Some(value.to_string());
 557                 }
 558                 "CFG_GDB" if value.len() > 0 => {
 559                     self.gdb = Some(parse_configure_path(value));
 560                 }
 561                 "CFG_RELEASE_CHANNEL" => {
 562                     self.channel = value.to_string();
 563                 }
 564                 "CFG_PREFIX" => {
 565                     self.prefix = Some(PathBuf::from(value));
 566                 }
 567                 "CFG_SYSCONFDIR" => {
 568                     self.sysconfdir = Some(PathBuf::from(value));
 569                 }
 570                 "CFG_DOCDIR" => {
 571                     self.docdir = Some(PathBuf::from(value));
 572                 }
 573                 "CFG_BINDIR" => {
 574                     self.bindir = Some(PathBuf::from(value));
 575                 }
 576                 "CFG_LIBDIR" => {
 577                     self.libdir = Some(PathBuf::from(value));
 578                 }
 579                 "CFG_LIBDIR_RELATIVE" => {
 580                     self.libdir_relative = Some(PathBuf::from(value));
 581                 }
 582                 "CFG_MANDIR" => {
 583                     self.mandir = Some(PathBuf::from(value));
 584                 }
 585                 "CFG_LLVM_ROOT" if value.len() > 0 => {
 586                     let target = self.target_config.entry(self.build.clone())
 587                                      .or_insert(Target::default());
 588                     let root = parse_configure_path(value);
 589                     target.llvm_config = Some(push_exe_path(root, &["bin", "llvm-config"]));
 590                 }
 591                 "CFG_JEMALLOC_ROOT" if value.len() > 0 => {
 592                     let target = self.target_config.entry(self.build.clone())
 593                                      .or_insert(Target::default());
 594                     target.jemalloc = Some(parse_configure_path(value).join("libjemalloc_pic.a"));
 595                 }
 596                 "CFG_ARM_LINUX_ANDROIDEABI_NDK" if value.len() > 0 => {
 597                     let target = INTERNER.intern_str("arm-linux-androideabi");
 598                     let target = self.target_config.entry(target).or_insert(Target::default());
 599                     target.ndk = Some(parse_configure_path(value));
 600                 }
 601                 "CFG_ARMV7_LINUX_ANDROIDEABI_NDK" if value.len() > 0 => {
 602                     let target = INTERNER.intern_str("armv7-linux-androideabi");
 603                     let target = self.target_config.entry(target).or_insert(Target::default());
 604                     target.ndk = Some(parse_configure_path(value));
 605                 }
 606                 "CFG_I686_LINUX_ANDROID_NDK" if value.len() > 0 => {
 607                     let target = INTERNER.intern_str("i686-linux-android");
 608                     let target = self.target_config.entry(target).or_insert(Target::default());
 609                     target.ndk = Some(parse_configure_path(value));
 610                 }
 611                 "CFG_AARCH64_LINUX_ANDROID_NDK" if value.len() > 0 => {
 612                     let target = INTERNER.intern_str("aarch64-linux-android");
 613                     let target = self.target_config.entry(target).or_insert(Target::default());
 614                     target.ndk = Some(parse_configure_path(value));
 615                 }
 616                 "CFG_X86_64_LINUX_ANDROID_NDK" if value.len() > 0 => {
 617                     let target = INTERNER.intern_str("x86_64-linux-android");
 618                     let target = self.target_config.entry(target).or_insert(Target::default());
 619                     target.ndk = Some(parse_configure_path(value));
 620                 }
 621                 "CFG_LOCAL_RUST_ROOT" if value.len() > 0 => {
 622                     let path = parse_configure_path(value);
 623                     self.initial_rustc = push_exe_path(path.clone(), &["bin", "rustc"]);
 624                     self.initial_cargo = push_exe_path(path, &["bin", "cargo"]);
 625                 }
 626                 "CFG_PYTHON" if value.len() > 0 => {
 627                     let path = parse_configure_path(value);
 628                     self.python = Some(path);
 629                 }
 630                 "CFG_ENABLE_CCACHE" if value == "1" => {
 631                     self.ccache = Some(exe("ccache", &self.build));
 632                 }
 633                 "CFG_ENABLE_SCCACHE" if value == "1" => {
 634                     self.ccache = Some(exe("sccache", &self.build));
 635                 }
 636                 "CFG_CONFIGURE_ARGS" if value.len() > 0 => {
 637                     self.configure_args = value.split_whitespace()
 638                                                .map(|s| s.to_string())
 639                                                .collect();
 640                 }
 641                 "CFG_QEMU_ARMHF_ROOTFS" if value.len() > 0 => {
 642                     let target = INTERNER.intern_str("arm-unknown-linux-gnueabihf");
 643                     let target = self.target_config.entry(target).or_insert(Target::default());
 644                     target.qemu_rootfs = Some(parse_configure_path(value));
 645                 }
 646                 _ => {}
 647             }
 648         }
 649     }
 650
 651     pub fn verbose(&self) -> bool {
 652         self.verbose > 0
 653     }
 654
 655     pub fn very_verbose(&self) -> bool {
 656         self.verbose > 1
 657     }
 658 }
 659
 660 #[cfg(not(windows))]
 661 fn parse_configure_path(path: &str) -> PathBuf {
 662     path.into()
 663 }
 664
 665 #[cfg(windows)]
 666 fn parse_configure_path(path: &str) -> PathBuf {
 667     // on windows, configure produces unix style paths e.g. /c/some/path but we
 668     // only want real windows paths
 669
 670     use std::process::Command;
 671     use build_helper;
 672
 673     // '/' is invalid in windows paths, so we can detect unix paths by the presence of it
 674     if !path.contains('/') {
 675         return path.into();
 676     }
 677
 678     let win_path = build_helper::output(Command::new("cygpath").arg("-w").arg(path));
 679     let win_path = win_path.trim();
 680
 681     win_path.into()
 682 }
 683
 684 fn set<T>(field: &mut T, val: Option<T>) {
 685     if let Some(v) = val {
 686         *field = v;
 687     }
 688 }