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
  27 /// Global configuration for the entire build and/or bootstrap.
  28 ///
  29 /// This structure is derived from a combination of both `config.toml` and
  30 /// `config.mk`. As of the time of this writing it's unlikely that `config.toml`
  31 /// is used all that much, so this is primarily filled out by `config.mk` which
  32 /// is generated from `./configure`.
  33 ///
  34 /// Note that this structure is not decoded directly into, but rather it is
  35 /// filled out from the decoded forms of the structs below. For documentation
  36 /// each field, see the corresponding fields in
  37 /// `src/bootstrap/config.toml.example`.
  38 #[derive(Default)]
  39 pub struct Config {
  40     pub ccache: Option<String>,
  41     pub ninja: bool,
  42     pub verbose: usize,
  43     pub submodules: bool,
  44     pub compiler_docs: bool,
  45     pub docs: bool,
  46     pub locked_deps: bool,
  47     pub vendor: bool,
  48     pub target_config: HashMap<String, Target>,
  49     pub full_bootstrap: bool,
  50     pub extended: bool,
  51     pub sanitizers: bool,
  52     pub profiler: bool,
  53
  54     // llvm codegen options
  55     pub llvm_assertions: bool,
  56     pub llvm_optimize: bool,
  57     pub llvm_release_debuginfo: bool,
  58     pub llvm_version_check: bool,
  59     pub llvm_static_stdcpp: bool,
  60     pub llvm_link_shared: bool,
  61     pub llvm_targets: Option<String>,
  62     pub llvm_experimental_targets: Option<String>,
  63     pub llvm_link_jobs: Option<u32>,
  64     pub llvm_clean_rebuild: bool,
  65
  66     // rust codegen options
  67     pub rust_optimize: bool,
  68     pub rust_codegen_units: u32,
  69     pub rust_debug_assertions: bool,
  70     pub rust_debuginfo: bool,
  71     pub rust_debuginfo_lines: bool,
  72     pub rust_debuginfo_only_std: bool,
  73     pub rust_rpath: bool,
  74     pub rustc_default_linker: Option<String>,
  75     pub rustc_default_ar: Option<String>,
  76     pub rust_optimize_tests: bool,
  77     pub rust_debuginfo_tests: bool,
  78     pub rust_dist_src: bool,
  79
  80     pub build: String,
  81     pub host: Vec<String>,
  82     pub target: Vec<String>,
  83     pub local_rebuild: bool,
  84
  85     // dist misc
  86     pub dist_sign_folder: Option<PathBuf>,
  87     pub dist_upload_addr: Option<String>,
  88     pub dist_gpg_password_file: Option<PathBuf>,
  89
  90     // libstd features
  91     pub debug_jemalloc: bool,
  92     pub use_jemalloc: bool,
  93     pub backtrace: bool, // support for RUST_BACKTRACE
  94
  95     // misc
  96     pub low_priority: bool,
  97     pub channel: String,
  98     pub quiet_tests: bool,
  99     // Fallback musl-root for all targets
 100     pub musl_root: Option<PathBuf>,
 101     pub prefix: Option<PathBuf>,
 102     pub sysconfdir: Option<PathBuf>,
 103     pub docdir: Option<PathBuf>,
 104     pub bindir: Option<PathBuf>,
 105     pub libdir: Option<PathBuf>,
 106     pub libdir_relative: Option<PathBuf>,
 107     pub mandir: Option<PathBuf>,
 108     pub codegen_tests: bool,
 109     pub nodejs: Option<PathBuf>,
 110     pub gdb: Option<PathBuf>,
 111     pub python: Option<PathBuf>,
 112     pub configure_args: Vec<String>,
 113     pub openssl_static: bool,
 114
 115
 116     // These are either the stage0 downloaded binaries or the locally installed ones.
 117     pub initial_cargo: PathBuf,
 118     pub initial_rustc: PathBuf,
 119
 120 }
 121
 122 /// Per-target configuration stored in the global configuration structure.
 123 #[derive(Default)]
 124 pub struct Target {
 125     /// Some(path to llvm-config) if using an external LLVM.
 126     pub llvm_config: Option<PathBuf>,
 127     pub jemalloc: Option<PathBuf>,
 128     pub cc: Option<PathBuf>,
 129     pub cxx: Option<PathBuf>,
 130     pub ndk: Option<PathBuf>,
 131     pub musl_root: Option<PathBuf>,
 132     pub qemu_rootfs: Option<PathBuf>,
 133 }
 134
 135 /// Structure of the `config.toml` file that configuration is read from.
 136 ///
 137 /// This structure uses `Decodable` to automatically decode a TOML configuration
 138 /// file into this format, and then this is traversed and written into the above
 139 /// `Config` structure.
 140 #[derive(Deserialize, Default)]
 141 #[serde(deny_unknown_fields)]
 142 #[serde(rename_all = "kebab-case")]
 143 struct TomlConfig {
 144     build: Option<Build>,
 145     install: Option<Install>,
 146     llvm: Option<Llvm>,
 147     rust: Option<Rust>,
 148     target: Option<HashMap<String, TomlTarget>>,
 149     dist: Option<Dist>,
 150 }
 151
 152 /// TOML representation of various global build decisions.
 153 #[derive(Deserialize, Default, Clone)]
 154 #[serde(deny_unknown_fields)]
 155 #[serde(rename_all = "kebab-case")]
 156 struct Build {
 157     build: Option<String>,
 158     #[serde(default)]
 159     host: Vec<String>,
 160     #[serde(default)]
 161     target: Vec<String>,
 162     cargo: Option<String>,
 163     rustc: Option<String>,
 164     low_priority: Option<bool>,
 165     compiler_docs: Option<bool>,
 166     docs: Option<bool>,
 167     submodules: Option<bool>,
 168     gdb: Option<String>,
 169     locked_deps: Option<bool>,
 170     vendor: Option<bool>,
 171     nodejs: Option<String>,
 172     python: Option<String>,
 173     full_bootstrap: Option<bool>,
 174     extended: Option<bool>,
 175     verbose: Option<usize>,
 176     sanitizers: Option<bool>,
 177     profiler: Option<bool>,
 178     openssl_static: Option<bool>,
 179 }
 180
 181 /// TOML representation of various global install decisions.
 182 #[derive(Deserialize, Default, Clone)]
 183 #[serde(deny_unknown_fields)]
 184 #[serde(rename_all = "kebab-case")]
 185 struct Install {
 186     prefix: Option<String>,
 187     sysconfdir: Option<String>,
 188     docdir: Option<String>,
 189     bindir: Option<String>,
 190     libdir: Option<String>,
 191     mandir: Option<String>,
 192 }
 193
 194 /// TOML representation of how the LLVM build is configured.
 195 #[derive(Deserialize, Default)]
 196 #[serde(deny_unknown_fields)]
 197 #[serde(rename_all = "kebab-case")]
 198 struct Llvm {
 199     ccache: Option<StringOrBool>,
 200     ninja: Option<bool>,
 201     assertions: Option<bool>,
 202     optimize: Option<bool>,
 203     release_debuginfo: Option<bool>,
 204     version_check: Option<bool>,
 205     static_libstdcpp: Option<bool>,
 206     targets: Option<String>,
 207     experimental_targets: Option<String>,
 208     link_jobs: Option<u32>,
 209     clean_rebuild: Option<bool>,
 210 }
 211
 212 #[derive(Deserialize, Default, Clone)]
 213 #[serde(deny_unknown_fields)]
 214 #[serde(rename_all = "kebab-case")]
 215 struct Dist {
 216     sign_folder: Option<String>,
 217     gpg_password_file: Option<String>,
 218     upload_addr: Option<String>,
 219     src_tarball: Option<bool>,
 220 }
 221
 222 #[derive(Deserialize)]
 223 #[serde(untagged)]
 224 enum StringOrBool {
 225     String(String),
 226     Bool(bool),
 227 }
 228
 229 impl Default for StringOrBool {
 230     fn default() -> StringOrBool {
 231         StringOrBool::Bool(false)
 232     }
 233 }
 234
 235 /// TOML representation of how the Rust build is configured.
 236 #[derive(Deserialize, Default)]
 237 #[serde(deny_unknown_fields)]
 238 #[serde(rename_all = "kebab-case")]
 239 struct Rust {
 240     optimize: Option<bool>,
 241     codegen_units: Option<u32>,
 242     debug_assertions: Option<bool>,
 243     debuginfo: Option<bool>,
 244     debuginfo_lines: Option<bool>,
 245     debuginfo_only_std: Option<bool>,
 246     debug_jemalloc: Option<bool>,
 247     use_jemalloc: Option<bool>,
 248     backtrace: Option<bool>,
 249     default_linker: Option<String>,
 250     default_ar: Option<String>,
 251     channel: Option<String>,
 252     musl_root: Option<String>,
 253     rpath: Option<bool>,
 254     optimize_tests: Option<bool>,
 255     debuginfo_tests: Option<bool>,
 256     codegen_tests: Option<bool>,
 257 }
 258
 259 /// TOML representation of how each build target is configured.
 260 #[derive(Deserialize, Default)]
 261 #[serde(deny_unknown_fields)]
 262 #[serde(rename_all = "kebab-case")]
 263 struct TomlTarget {
 264     llvm_config: Option<String>,
 265     jemalloc: Option<String>,
 266     cc: Option<String>,
 267     cxx: Option<String>,
 268     android_ndk: Option<String>,
 269     musl_root: Option<String>,
 270     qemu_rootfs: Option<String>,
 271 }
 272
 273 impl Config {
 274     pub fn parse(build: &str, file: Option<PathBuf>) -> Config {
 275         let mut config = Config::default();
 276         config.llvm_optimize = true;
 277         config.use_jemalloc = true;
 278         config.backtrace = true;
 279         config.rust_optimize = true;
 280         config.rust_optimize_tests = true;
 281         config.submodules = true;
 282         config.docs = true;
 283         config.rust_rpath = true;
 284         config.rust_codegen_units = 1;
 285         config.build = build.to_string();
 286         config.channel = "dev".to_string();
 287         config.codegen_tests = true;
 288         config.rust_dist_src = true;
 289
 290         let toml = file.map(|file| {
 291             let mut f = t!(File::open(&file));
 292             let mut contents = String::new();
 293             t!(f.read_to_string(&mut contents));
 294             match toml::from_str(&contents) {
 295                 Ok(table) => table,
 296                 Err(err) => {
 297                     println!("failed to parse TOML configuration '{}': {}",
 298                         file.display(), err);
 299                     process::exit(2);
 300                 }
 301             }
 302         }).unwrap_or_else(|| TomlConfig::default());
 303
 304         let build = toml.build.clone().unwrap_or(Build::default());
 305         set(&mut config.build, build.build.clone());
 306         config.host.push(config.build.clone());
 307         for host in build.host.iter() {
 308             if !config.host.contains(host) {
 309                 config.host.push(host.clone());
 310             }
 311         }
 312         for target in config.host.iter().chain(&build.target) {
 313             if !config.target.contains(target) {
 314                 config.target.push(target.clone());
 315             }
 316         }
 317         config.nodejs = build.nodejs.map(PathBuf::from);
 318         config.gdb = build.gdb.map(PathBuf::from);
 319         config.python = build.python.map(PathBuf::from);
 320         set(&mut config.low_priority, build.low_priority);
 321         set(&mut config.compiler_docs, build.compiler_docs);
 322         set(&mut config.docs, build.docs);
 323         set(&mut config.submodules, build.submodules);
 324         set(&mut config.locked_deps, build.locked_deps);
 325         set(&mut config.vendor, build.vendor);
 326         set(&mut config.full_bootstrap, build.full_bootstrap);
 327         set(&mut config.extended, build.extended);
 328         set(&mut config.verbose, build.verbose);
 329         set(&mut config.sanitizers, build.sanitizers);
 330         set(&mut config.profiler, build.profiler);
 331         set(&mut config.openssl_static, build.openssl_static);
 332
 333         if let Some(ref install) = toml.install {
 334             config.prefix = install.prefix.clone().map(PathBuf::from);
 335             config.sysconfdir = install.sysconfdir.clone().map(PathBuf::from);
 336             config.docdir = install.docdir.clone().map(PathBuf::from);
 337             config.bindir = install.bindir.clone().map(PathBuf::from);
 338             config.libdir = install.libdir.clone().map(PathBuf::from);
 339             config.mandir = install.mandir.clone().map(PathBuf::from);
 340         }
 341
 342         if let Some(ref llvm) = toml.llvm {
 343             match llvm.ccache {
 344                 Some(StringOrBool::String(ref s)) => {
 345                     config.ccache = Some(s.to_string())
 346                 }
 347                 Some(StringOrBool::Bool(true)) => {
 348                     config.ccache = Some("ccache".to_string());
 349                 }
 350                 Some(StringOrBool::Bool(false)) | None => {}
 351             }
 352             set(&mut config.ninja, llvm.ninja);
 353             set(&mut config.llvm_assertions, llvm.assertions);
 354             set(&mut config.llvm_optimize, llvm.optimize);
 355             set(&mut config.llvm_release_debuginfo, llvm.release_debuginfo);
 356             set(&mut config.llvm_version_check, llvm.version_check);
 357             set(&mut config.llvm_static_stdcpp, llvm.static_libstdcpp);
 358             set(&mut config.llvm_clean_rebuild, llvm.clean_rebuild);
 359             config.llvm_targets = llvm.targets.clone();
 360             config.llvm_experimental_targets = llvm.experimental_targets.clone();
 361             config.llvm_link_jobs = llvm.link_jobs;
 362         }
 363
 364         if let Some(ref rust) = toml.rust {
 365             set(&mut config.rust_debug_assertions, rust.debug_assertions);
 366             set(&mut config.rust_debuginfo, rust.debuginfo);
 367             set(&mut config.rust_debuginfo_lines, rust.debuginfo_lines);
 368             set(&mut config.rust_debuginfo_only_std, rust.debuginfo_only_std);
 369             set(&mut config.rust_optimize, rust.optimize);
 370             set(&mut config.rust_optimize_tests, rust.optimize_tests);
 371             set(&mut config.rust_debuginfo_tests, rust.debuginfo_tests);
 372             set(&mut config.codegen_tests, rust.codegen_tests);
 373             set(&mut config.rust_rpath, rust.rpath);
 374             set(&mut config.debug_jemalloc, rust.debug_jemalloc);
 375             set(&mut config.use_jemalloc, rust.use_jemalloc);
 376             set(&mut config.backtrace, rust.backtrace);
 377             set(&mut config.channel, rust.channel.clone());
 378             config.rustc_default_linker = rust.default_linker.clone();
 379             config.rustc_default_ar = rust.default_ar.clone();
 380             config.musl_root = rust.musl_root.clone().map(PathBuf::from);
 381
 382             match rust.codegen_units {
 383                 Some(0) => config.rust_codegen_units = num_cpus::get() as u32,
 384                 Some(n) => config.rust_codegen_units = n,
 385                 None => {}
 386             }
 387         }
 388
 389         if let Some(ref t) = toml.target {
 390             for (triple, cfg) in t {
 391                 let mut target = Target::default();
 392
 393                 if let Some(ref s) = cfg.llvm_config {
 394                     target.llvm_config = Some(env::current_dir().unwrap().join(s));
 395                 }
 396                 if let Some(ref s) = cfg.jemalloc {
 397                     target.jemalloc = Some(env::current_dir().unwrap().join(s));
 398                 }
 399                 if let Some(ref s) = cfg.android_ndk {
 400                     target.ndk = Some(env::current_dir().unwrap().join(s));
 401                 }
 402                 target.cxx = cfg.cxx.clone().map(PathBuf::from);
 403                 target.cc = cfg.cc.clone().map(PathBuf::from);
 404                 target.musl_root = cfg.musl_root.clone().map(PathBuf::from);
 405                 target.qemu_rootfs = cfg.qemu_rootfs.clone().map(PathBuf::from);
 406
 407                 config.target_config.insert(triple.clone(), target);
 408             }
 409         }
 410
 411         if let Some(ref t) = toml.dist {
 412             config.dist_sign_folder = t.sign_folder.clone().map(PathBuf::from);
 413             config.dist_gpg_password_file = t.gpg_password_file.clone().map(PathBuf::from);
 414             config.dist_upload_addr = t.upload_addr.clone();
 415             set(&mut config.rust_dist_src, t.src_tarball);
 416         }
 417
 418         let cwd = t!(env::current_dir());
 419         let out = cwd.join("build");
 420
 421         let stage0_root = out.join(&config.build).join("stage0/bin");
 422         config.initial_rustc = match build.rustc {
 423             Some(s) => PathBuf::from(s),
 424             None => stage0_root.join(exe("rustc", &config.build)),
 425         };
 426         config.initial_cargo = match build.cargo {
 427             Some(s) => PathBuf::from(s),
 428             None => stage0_root.join(exe("cargo", &config.build)),
 429         };
 430
 431         // compat with `./configure` while we're still using that
 432         if fs::metadata("config.mk").is_ok() {
 433             config.update_with_config_mk();
 434         }
 435
 436         config
 437     }
 438
 439     /// "Temporary" routine to parse `config.mk` into this configuration.
 440     ///
 441     /// While we still have `./configure` this implements the ability to decode
 442     /// that configuration into this. This isn't exactly a full-blown makefile
 443     /// parser, but hey it gets the job done!
 444     fn update_with_config_mk(&mut self) {
 445         let mut config = String::new();
 446         File::open("config.mk").unwrap().read_to_string(&mut config).unwrap();
 447         for line in config.lines() {
 448             let mut parts = line.splitn(2, ":=").map(|s| s.trim());
 449             let key = parts.next().unwrap();
 450             let value = match parts.next() {
 451                 Some(n) if n.starts_with('\"') => &n[1..n.len() - 1],
 452                 Some(n) => n,
 453                 None => continue
 454             };
 455
 456             macro_rules! check {
 457                 ($(($name:expr, $val:expr),)*) => {
 458                     if value == "1" {
 459                         $(
 460                             if key == concat!("CFG_ENABLE_", $name) {
 461                                 $val = true;
 462                                 continue
 463                             }
 464                             if key == concat!("CFG_DISABLE_", $name) {
 465                                 $val = false;
 466                                 continue
 467                             }
 468                         )*
 469                     }
 470                 }
 471             }
 472
 473             check! {
 474                 ("MANAGE_SUBMODULES", self.submodules),
 475                 ("COMPILER_DOCS", self.compiler_docs),
 476                 ("DOCS", self.docs),
 477                 ("LLVM_ASSERTIONS", self.llvm_assertions),
 478                 ("LLVM_RELEASE_DEBUGINFO", self.llvm_release_debuginfo),
 479                 ("OPTIMIZE_LLVM", self.llvm_optimize),
 480                 ("LLVM_VERSION_CHECK", self.llvm_version_check),
 481                 ("LLVM_STATIC_STDCPP", self.llvm_static_stdcpp),
 482                 ("LLVM_LINK_SHARED", self.llvm_link_shared),
 483                 ("LLVM_CLEAN_REBUILD", self.llvm_clean_rebuild),
 484                 ("OPTIMIZE", self.rust_optimize),
 485                 ("DEBUG_ASSERTIONS", self.rust_debug_assertions),
 486                 ("DEBUGINFO", self.rust_debuginfo),
 487                 ("DEBUGINFO_LINES", self.rust_debuginfo_lines),
 488                 ("DEBUGINFO_ONLY_STD", self.rust_debuginfo_only_std),
 489                 ("JEMALLOC", self.use_jemalloc),
 490                 ("DEBUG_JEMALLOC", self.debug_jemalloc),
 491                 ("RPATH", self.rust_rpath),
 492                 ("OPTIMIZE_TESTS", self.rust_optimize_tests),
 493                 ("DEBUGINFO_TESTS", self.rust_debuginfo_tests),
 494                 ("QUIET_TESTS", self.quiet_tests),
 495                 ("LOCAL_REBUILD", self.local_rebuild),
 496                 ("NINJA", self.ninja),
 497                 ("CODEGEN_TESTS", self.codegen_tests),
 498                 ("LOCKED_DEPS", self.locked_deps),
 499                 ("VENDOR", self.vendor),
 500                 ("FULL_BOOTSTRAP", self.full_bootstrap),
 501                 ("EXTENDED", self.extended),
 502                 ("SANITIZERS", self.sanitizers),
 503                 ("PROFILER", self.profiler),
 504                 ("DIST_SRC", self.rust_dist_src),
 505                 ("CARGO_OPENSSL_STATIC", self.openssl_static),
 506             }
 507
 508             match key {
 509                 "CFG_BUILD" if value.len() > 0 => self.build = value.to_string(),
 510                 "CFG_HOST" if value.len() > 0 => {
 511                     self.host.extend(value.split(" ").map(|s| s.to_string()));
 512
 513                 }
 514                 "CFG_TARGET" if value.len() > 0 => {
 515                     self.target.extend(value.split(" ").map(|s| s.to_string()));
 516                 }
 517                 "CFG_EXPERIMENTAL_TARGETS" if value.len() > 0 => {
 518                     self.llvm_experimental_targets = Some(value.to_string());
 519                 }
 520                 "CFG_MUSL_ROOT" if value.len() > 0 => {
 521                     self.musl_root = Some(parse_configure_path(value));
 522                 }
 523                 "CFG_MUSL_ROOT_X86_64" if value.len() > 0 => {
 524                     let target = "x86_64-unknown-linux-musl".to_string();
 525                     let target = self.target_config.entry(target)
 526                                      .or_insert(Target::default());
 527                     target.musl_root = Some(parse_configure_path(value));
 528                 }
 529                 "CFG_MUSL_ROOT_I686" if value.len() > 0 => {
 530                     let target = "i686-unknown-linux-musl".to_string();
 531                     let target = self.target_config.entry(target)
 532                                      .or_insert(Target::default());
 533                     target.musl_root = Some(parse_configure_path(value));
 534                 }
 535                 "CFG_MUSL_ROOT_ARM" if value.len() > 0 => {
 536                     let target = "arm-unknown-linux-musleabi".to_string();
 537                     let target = self.target_config.entry(target)
 538                                      .or_insert(Target::default());
 539                     target.musl_root = Some(parse_configure_path(value));
 540                 }
 541                 "CFG_MUSL_ROOT_ARMHF" if value.len() > 0 => {
 542                     let target = "arm-unknown-linux-musleabihf".to_string();
 543                     let target = self.target_config.entry(target)
 544                                      .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 = "armv7-unknown-linux-musleabihf".to_string();
 549                     let target = self.target_config.entry(target)
 550                                      .or_insert(Target::default());
 551                     target.musl_root = Some(parse_configure_path(value));
 552                 }
 553                 "CFG_DEFAULT_AR" if value.len() > 0 => {
 554                     self.rustc_default_ar = Some(value.to_string());
 555                 }
 556                 "CFG_DEFAULT_LINKER" if value.len() > 0 => {
 557                     self.rustc_default_linker = Some(value.to_string());
 558                 }
 559                 "CFG_GDB" if value.len() > 0 => {
 560                     self.gdb = Some(parse_configure_path(value));
 561                 }
 562                 "CFG_RELEASE_CHANNEL" => {
 563                     self.channel = value.to_string();
 564                 }
 565                 "CFG_PREFIX" => {
 566                     self.prefix = Some(PathBuf::from(value));
 567                 }
 568                 "CFG_SYSCONFDIR" => {
 569                     self.sysconfdir = Some(PathBuf::from(value));
 570                 }
 571                 "CFG_DOCDIR" => {
 572                     self.docdir = Some(PathBuf::from(value));
 573                 }
 574                 "CFG_BINDIR" => {
 575                     self.bindir = Some(PathBuf::from(value));
 576                 }
 577                 "CFG_LIBDIR" => {
 578                     self.libdir = Some(PathBuf::from(value));
 579                 }
 580                 "CFG_LIBDIR_RELATIVE" => {
 581                     self.libdir_relative = Some(PathBuf::from(value));
 582                 }
 583                 "CFG_MANDIR" => {
 584                     self.mandir = Some(PathBuf::from(value));
 585                 }
 586                 "CFG_LLVM_ROOT" if value.len() > 0 => {
 587                     let target = self.target_config.entry(self.build.clone())
 588                                      .or_insert(Target::default());
 589                     let root = parse_configure_path(value);
 590                     target.llvm_config = Some(push_exe_path(root, &["bin", "llvm-config"]));
 591                 }
 592                 "CFG_JEMALLOC_ROOT" if value.len() > 0 => {
 593                     let target = self.target_config.entry(self.build.clone())
 594                                      .or_insert(Target::default());
 595                     target.jemalloc = Some(parse_configure_path(value).join("libjemalloc_pic.a"));
 596                 }
 597                 "CFG_ARM_LINUX_ANDROIDEABI_NDK" if value.len() > 0 => {
 598                     let target = "arm-linux-androideabi".to_string();
 599                     let target = self.target_config.entry(target)
 600                                      .or_insert(Target::default());
 601                     target.ndk = Some(parse_configure_path(value));
 602                 }
 603                 "CFG_ARMV7_LINUX_ANDROIDEABI_NDK" if value.len() > 0 => {
 604                     let target = "armv7-linux-androideabi".to_string();
 605                     let target = self.target_config.entry(target)
 606                                      .or_insert(Target::default());
 607                     target.ndk = Some(parse_configure_path(value));
 608                 }
 609                 "CFG_I686_LINUX_ANDROID_NDK" if value.len() > 0 => {
 610                     let target = "i686-linux-android".to_string();
 611                     let target = self.target_config.entry(target)
 612                                      .or_insert(Target::default());
 613                     target.ndk = Some(parse_configure_path(value));
 614                 }
 615                 "CFG_AARCH64_LINUX_ANDROID_NDK" if value.len() > 0 => {
 616                     let target = "aarch64-linux-android".to_string();
 617                     let target = self.target_config.entry(target)
 618                                      .or_insert(Target::default());
 619                     target.ndk = Some(parse_configure_path(value));
 620                 }
 621                 "CFG_X86_64_LINUX_ANDROID_NDK" if value.len() > 0 => {
 622                     let target = "x86_64-linux-android".to_string();
 623                     let target = self.target_config.entry(target)
 624                                      .or_insert(Target::default());
 625                     target.ndk = Some(parse_configure_path(value));
 626                 }
 627                 "CFG_LOCAL_RUST_ROOT" if value.len() > 0 => {
 628                     let path = parse_configure_path(value);
 629                     self.initial_rustc = push_exe_path(path.clone(), &["bin", "rustc"]);
 630                     self.initial_cargo = push_exe_path(path, &["bin", "cargo"]);
 631                 }
 632                 "CFG_PYTHON" if value.len() > 0 => {
 633                     let path = parse_configure_path(value);
 634                     self.python = Some(path);
 635                 }
 636                 "CFG_ENABLE_CCACHE" if value == "1" => {
 637                     self.ccache = Some(exe("ccache", &self.build));
 638                 }
 639                 "CFG_ENABLE_SCCACHE" if value == "1" => {
 640                     self.ccache = Some(exe("sccache", &self.build));
 641                 }
 642                 "CFG_CONFIGURE_ARGS" if value.len() > 0 => {
 643                     self.configure_args = value.split_whitespace()
 644                                                .map(|s| s.to_string())
 645                                                .collect();
 646                 }
 647                 "CFG_QEMU_ARMHF_ROOTFS" if value.len() > 0 => {
 648                     let target = "arm-unknown-linux-gnueabihf".to_string();
 649                     let target = self.target_config.entry(target)
 650                                      .or_insert(Target::default());
 651                     target.qemu_rootfs = Some(parse_configure_path(value));
 652                 }
 653                 _ => {}
 654             }
 655         }
 656     }
 657
 658     pub fn verbose(&self) -> bool {
 659         self.verbose > 0
 660     }
 661
 662     pub fn very_verbose(&self) -> bool {
 663         self.verbose > 1
 664     }
 665 }
 666
 667 #[cfg(not(windows))]
 668 fn parse_configure_path(path: &str) -> PathBuf {
 669     path.into()
 670 }
 671
 672 #[cfg(windows)]
 673 fn parse_configure_path(path: &str) -> PathBuf {
 674     // on windows, configure produces unix style paths e.g. /c/some/path but we
 675     // only want real windows paths
 676
 677     use std::process::Command;
 678     use build_helper;
 679
 680     // '/' is invalid in windows paths, so we can detect unix paths by the presence of it
 681     if !path.contains('/') {
 682         return path.into();
 683     }
 684
 685     let win_path = build_helper::output(Command::new("cygpath").arg("-w").arg(path));
 686     let win_path = win_path.trim();
 687
 688     win_path.into()
 689 }
 690
 691 fn set<T>(field: &mut T, val: Option<T>) {
 692     if let Some(v) = val {
 693         *field = v;
 694     }
 695 }