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::File;
  19 use std::io::prelude::*;
  20 use std::path::PathBuf;
  21 use std::process;
  22
  23 use num_cpus;
  24 use rustc_serialize::Decodable;
  25 use toml::{Parser, Decoder, Value};
  26 use util::push_exe_path;
  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<String, Target>,
  50     pub full_bootstrap: bool,
  51     pub extended: bool,
  52     pub sanitizers: 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_link_jobs: Option<u32>,
  63
  64     // rust codegen options
  65     pub rust_optimize: bool,
  66     pub rust_codegen_units: u32,
  67     pub rust_debug_assertions: bool,
  68     pub rust_debuginfo: bool,
  69     pub rust_debuginfo_lines: bool,
  70     pub rust_debuginfo_only_std: bool,
  71     pub rust_rpath: bool,
  72     pub rustc_default_linker: Option<String>,
  73     pub rustc_default_ar: Option<String>,
  74     pub rust_optimize_tests: bool,
  75     pub rust_debuginfo_tests: bool,
  76     pub rust_dist_src: bool,
  77
  78     pub build: String,
  79     pub host: Vec<String>,
  80     pub target: Vec<String>,
  81     pub rustc: Option<PathBuf>,
  82     pub cargo: Option<PathBuf>,
  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 channel: String,
  97     pub quiet_tests: bool,
  98     // Fallback musl-root for all targets
  99     pub musl_root: Option<PathBuf>,
 100     pub prefix: Option<PathBuf>,
 101     pub docdir: Option<PathBuf>,
 102     pub libdir: Option<PathBuf>,
 103     pub libdir_relative: Option<PathBuf>,
 104     pub mandir: Option<PathBuf>,
 105     pub codegen_tests: bool,
 106     pub nodejs: Option<PathBuf>,
 107     pub gdb: Option<PathBuf>,
 108     pub python: Option<PathBuf>,
 109     pub configure_args: Vec<String>,
 110     pub openssl_static: bool,
 111 }
 112
 113 /// Per-target configuration stored in the global configuration structure.
 114 #[derive(Default)]
 115 pub struct Target {
 116     pub llvm_config: Option<PathBuf>,
 117     pub jemalloc: Option<PathBuf>,
 118     pub cc: Option<PathBuf>,
 119     pub cxx: Option<PathBuf>,
 120     pub ndk: Option<PathBuf>,
 121     pub musl_root: Option<PathBuf>,
 122     pub qemu_rootfs: Option<PathBuf>,
 123 }
 124
 125 /// Structure of the `config.toml` file that configuration is read from.
 126 ///
 127 /// This structure uses `Decodable` to automatically decode a TOML configuration
 128 /// file into this format, and then this is traversed and written into the above
 129 /// `Config` structure.
 130 #[derive(RustcDecodable, Default)]
 131 struct TomlConfig {
 132     build: Option<Build>,
 133     install: Option<Install>,
 134     llvm: Option<Llvm>,
 135     rust: Option<Rust>,
 136     target: Option<HashMap<String, TomlTarget>>,
 137     dist: Option<Dist>,
 138 }
 139
 140 /// TOML representation of various global build decisions.
 141 #[derive(RustcDecodable, Default, Clone)]
 142 struct Build {
 143     build: Option<String>,
 144     host: Vec<String>,
 145     target: Vec<String>,
 146     cargo: Option<String>,
 147     rustc: Option<String>,
 148     compiler_docs: Option<bool>,
 149     docs: Option<bool>,
 150     submodules: Option<bool>,
 151     gdb: Option<String>,
 152     locked_deps: Option<bool>,
 153     vendor: Option<bool>,
 154     nodejs: Option<String>,
 155     python: Option<String>,
 156     full_bootstrap: Option<bool>,
 157     extended: Option<bool>,
 158     verbose: Option<usize>,
 159     sanitizers: Option<bool>,
 160     openssl_static: Option<bool>,
 161 }
 162
 163 /// TOML representation of various global install decisions.
 164 #[derive(RustcDecodable, Default, Clone)]
 165 struct Install {
 166     prefix: Option<String>,
 167     mandir: Option<String>,
 168     docdir: Option<String>,
 169     libdir: Option<String>,
 170 }
 171
 172 /// TOML representation of how the LLVM build is configured.
 173 #[derive(RustcDecodable, Default)]
 174 struct Llvm {
 175     ccache: Option<StringOrBool>,
 176     ninja: Option<bool>,
 177     assertions: Option<bool>,
 178     optimize: Option<bool>,
 179     release_debuginfo: Option<bool>,
 180     version_check: Option<bool>,
 181     static_libstdcpp: Option<bool>,
 182     targets: Option<String>,
 183     link_jobs: Option<u32>,
 184 }
 185
 186 #[derive(RustcDecodable, Default, Clone)]
 187 struct Dist {
 188     sign_folder: Option<String>,
 189     gpg_password_file: Option<String>,
 190     upload_addr: Option<String>,
 191     src_tarball: Option<bool>,
 192 }
 193
 194 #[derive(RustcDecodable)]
 195 enum StringOrBool {
 196     String(String),
 197     Bool(bool),
 198 }
 199
 200 impl Default for StringOrBool {
 201     fn default() -> StringOrBool {
 202         StringOrBool::Bool(false)
 203     }
 204 }
 205
 206 /// TOML representation of how the Rust build is configured.
 207 #[derive(RustcDecodable, Default)]
 208 struct Rust {
 209     optimize: Option<bool>,
 210     codegen_units: Option<u32>,
 211     debug_assertions: Option<bool>,
 212     debuginfo: Option<bool>,
 213     debuginfo_lines: Option<bool>,
 214     debuginfo_only_std: Option<bool>,
 215     debug_jemalloc: Option<bool>,
 216     use_jemalloc: Option<bool>,
 217     backtrace: Option<bool>,
 218     default_linker: Option<String>,
 219     default_ar: Option<String>,
 220     channel: Option<String>,
 221     musl_root: Option<String>,
 222     rpath: Option<bool>,
 223     optimize_tests: Option<bool>,
 224     debuginfo_tests: Option<bool>,
 225     codegen_tests: Option<bool>,
 226 }
 227
 228 /// TOML representation of how each build target is configured.
 229 #[derive(RustcDecodable, Default)]
 230 struct TomlTarget {
 231     llvm_config: Option<String>,
 232     jemalloc: Option<String>,
 233     cc: Option<String>,
 234     cxx: Option<String>,
 235     android_ndk: Option<String>,
 236     musl_root: Option<String>,
 237     qemu_rootfs: Option<String>,
 238 }
 239
 240 impl Config {
 241     pub fn parse(build: &str, file: Option<PathBuf>) -> Config {
 242         let mut config = Config::default();
 243         config.llvm_optimize = true;
 244         config.use_jemalloc = true;
 245         config.backtrace = true;
 246         config.rust_optimize = true;
 247         config.rust_optimize_tests = true;
 248         config.submodules = true;
 249         config.docs = true;
 250         config.rust_rpath = true;
 251         config.rust_codegen_units = 1;
 252         config.build = build.to_string();
 253         config.channel = "dev".to_string();
 254         config.codegen_tests = true;
 255         config.rust_dist_src = true;
 256
 257         let toml = file.map(|file| {
 258             let mut f = t!(File::open(&file));
 259             let mut toml = String::new();
 260             t!(f.read_to_string(&mut toml));
 261             let mut p = Parser::new(&toml);
 262             let table = match p.parse() {
 263                 Some(table) => table,
 264                 None => {
 265                     println!("failed to parse TOML configuration:");
 266                     for err in p.errors.iter() {
 267                         let (loline, locol) = p.to_linecol(err.lo);
 268                         let (hiline, hicol) = p.to_linecol(err.hi);
 269                         println!("{}:{}-{}:{}: {}", loline, locol, hiline,
 270                                  hicol, err.desc);
 271                     }
 272                     process::exit(2);
 273                 }
 274             };
 275             let mut d = Decoder::new(Value::Table(table));
 276             match Decodable::decode(&mut d) {
 277                 Ok(cfg) => cfg,
 278                 Err(e) => {
 279                     println!("failed to decode TOML: {}", e);
 280                     process::exit(2);
 281                 }
 282             }
 283         }).unwrap_or_else(|| TomlConfig::default());
 284
 285         let build = toml.build.clone().unwrap_or(Build::default());
 286         set(&mut config.build, build.build.clone());
 287         config.host.push(config.build.clone());
 288         for host in build.host.iter() {
 289             if !config.host.contains(host) {
 290                 config.host.push(host.clone());
 291             }
 292         }
 293         for target in config.host.iter().chain(&build.target) {
 294             if !config.target.contains(target) {
 295                 config.target.push(target.clone());
 296             }
 297         }
 298         config.rustc = build.rustc.map(PathBuf::from);
 299         config.cargo = build.cargo.map(PathBuf::from);
 300         config.nodejs = build.nodejs.map(PathBuf::from);
 301         config.gdb = build.gdb.map(PathBuf::from);
 302         config.python = build.python.map(PathBuf::from);
 303         set(&mut config.compiler_docs, build.compiler_docs);
 304         set(&mut config.docs, build.docs);
 305         set(&mut config.submodules, build.submodules);
 306         set(&mut config.locked_deps, build.locked_deps);
 307         set(&mut config.vendor, build.vendor);
 308         set(&mut config.full_bootstrap, build.full_bootstrap);
 309         set(&mut config.extended, build.extended);
 310         set(&mut config.verbose, build.verbose);
 311         set(&mut config.sanitizers, build.sanitizers);
 312         set(&mut config.openssl_static, build.openssl_static);
 313
 314         if let Some(ref install) = toml.install {
 315             config.prefix = install.prefix.clone().map(PathBuf::from);
 316             config.mandir = install.mandir.clone().map(PathBuf::from);
 317             config.docdir = install.docdir.clone().map(PathBuf::from);
 318             config.libdir = install.libdir.clone().map(PathBuf::from);
 319         }
 320
 321         if let Some(ref llvm) = toml.llvm {
 322             match llvm.ccache {
 323                 Some(StringOrBool::String(ref s)) => {
 324                     config.ccache = Some(s.to_string())
 325                 }
 326                 Some(StringOrBool::Bool(true)) => {
 327                     config.ccache = Some("ccache".to_string());
 328                 }
 329                 Some(StringOrBool::Bool(false)) | None => {}
 330             }
 331             set(&mut config.ninja, llvm.ninja);
 332             set(&mut config.llvm_assertions, llvm.assertions);
 333             set(&mut config.llvm_optimize, llvm.optimize);
 334             set(&mut config.llvm_release_debuginfo, llvm.release_debuginfo);
 335             set(&mut config.llvm_version_check, llvm.version_check);
 336             set(&mut config.llvm_static_stdcpp, llvm.static_libstdcpp);
 337             config.llvm_targets = llvm.targets.clone();
 338             config.llvm_link_jobs = llvm.link_jobs;
 339         }
 340
 341         if let Some(ref rust) = toml.rust {
 342             set(&mut config.rust_debug_assertions, rust.debug_assertions);
 343             set(&mut config.rust_debuginfo, rust.debuginfo);
 344             set(&mut config.rust_debuginfo_lines, rust.debuginfo_lines);
 345             set(&mut config.rust_debuginfo_only_std, rust.debuginfo_only_std);
 346             set(&mut config.rust_optimize, rust.optimize);
 347             set(&mut config.rust_optimize_tests, rust.optimize_tests);
 348             set(&mut config.rust_debuginfo_tests, rust.debuginfo_tests);
 349             set(&mut config.codegen_tests, rust.codegen_tests);
 350             set(&mut config.rust_rpath, rust.rpath);
 351             set(&mut config.debug_jemalloc, rust.debug_jemalloc);
 352             set(&mut config.use_jemalloc, rust.use_jemalloc);
 353             set(&mut config.backtrace, rust.backtrace);
 354             set(&mut config.channel, rust.channel.clone());
 355             config.rustc_default_linker = rust.default_linker.clone();
 356             config.rustc_default_ar = rust.default_ar.clone();
 357             config.musl_root = rust.musl_root.clone().map(PathBuf::from);
 358
 359             match rust.codegen_units {
 360                 Some(0) => config.rust_codegen_units = num_cpus::get() as u32,
 361                 Some(n) => config.rust_codegen_units = n,
 362                 None => {}
 363             }
 364         }
 365
 366         if let Some(ref t) = toml.target {
 367             for (triple, cfg) in t {
 368                 let mut target = Target::default();
 369
 370                 if let Some(ref s) = cfg.llvm_config {
 371                     target.llvm_config = Some(env::current_dir().unwrap().join(s));
 372                 }
 373                 if let Some(ref s) = cfg.jemalloc {
 374                     target.jemalloc = Some(env::current_dir().unwrap().join(s));
 375                 }
 376                 if let Some(ref s) = cfg.android_ndk {
 377                     target.ndk = Some(env::current_dir().unwrap().join(s));
 378                 }
 379                 target.cxx = cfg.cxx.clone().map(PathBuf::from);
 380                 target.cc = cfg.cc.clone().map(PathBuf::from);
 381                 target.musl_root = cfg.musl_root.clone().map(PathBuf::from);
 382                 target.qemu_rootfs = cfg.qemu_rootfs.clone().map(PathBuf::from);
 383
 384                 config.target_config.insert(triple.clone(), target);
 385             }
 386         }
 387
 388         if let Some(ref t) = toml.dist {
 389             config.dist_sign_folder = t.sign_folder.clone().map(PathBuf::from);
 390             config.dist_gpg_password_file = t.gpg_password_file.clone().map(PathBuf::from);
 391             config.dist_upload_addr = t.upload_addr.clone();
 392             set(&mut config.rust_dist_src, t.src_tarball);
 393         }
 394
 395         return config
 396     }
 397
 398     /// "Temporary" routine to parse `config.mk` into this configuration.
 399     ///
 400     /// While we still have `./configure` this implements the ability to decode
 401     /// that configuration into this. This isn't exactly a full-blown makefile
 402     /// parser, but hey it gets the job done!
 403     pub fn update_with_config_mk(&mut self) {
 404         let mut config = String::new();
 405         File::open("config.mk").unwrap().read_to_string(&mut config).unwrap();
 406         for line in config.lines() {
 407             let mut parts = line.splitn(2, ":=").map(|s| s.trim());
 408             let key = parts.next().unwrap();
 409             let value = match parts.next() {
 410                 Some(n) if n.starts_with('\"') => &n[1..n.len() - 1],
 411                 Some(n) => n,
 412                 None => continue
 413             };
 414
 415             macro_rules! check {
 416                 ($(($name:expr, $val:expr),)*) => {
 417                     if value == "1" {
 418                         $(
 419                             if key == concat!("CFG_ENABLE_", $name) {
 420                                 $val = true;
 421                                 continue
 422                             }
 423                             if key == concat!("CFG_DISABLE_", $name) {
 424                                 $val = false;
 425                                 continue
 426                             }
 427                         )*
 428                     }
 429                 }
 430             }
 431
 432             check! {
 433                 ("MANAGE_SUBMODULES", self.submodules),
 434                 ("COMPILER_DOCS", self.compiler_docs),
 435                 ("DOCS", self.docs),
 436                 ("LLVM_ASSERTIONS", self.llvm_assertions),
 437                 ("LLVM_RELEASE_DEBUGINFO", self.llvm_release_debuginfo),
 438                 ("OPTIMIZE_LLVM", self.llvm_optimize),
 439                 ("LLVM_VERSION_CHECK", self.llvm_version_check),
 440                 ("LLVM_STATIC_STDCPP", self.llvm_static_stdcpp),
 441                 ("LLVM_LINK_SHARED", self.llvm_link_shared),
 442                 ("OPTIMIZE", self.rust_optimize),
 443                 ("DEBUG_ASSERTIONS", self.rust_debug_assertions),
 444                 ("DEBUGINFO", self.rust_debuginfo),
 445                 ("DEBUGINFO_LINES", self.rust_debuginfo_lines),
 446                 ("DEBUGINFO_ONLY_STD", self.rust_debuginfo_only_std),
 447                 ("JEMALLOC", self.use_jemalloc),
 448                 ("DEBUG_JEMALLOC", self.debug_jemalloc),
 449                 ("RPATH", self.rust_rpath),
 450                 ("OPTIMIZE_TESTS", self.rust_optimize_tests),
 451                 ("DEBUGINFO_TESTS", self.rust_debuginfo_tests),
 452                 ("QUIET_TESTS", self.quiet_tests),
 453                 ("LOCAL_REBUILD", self.local_rebuild),
 454                 ("NINJA", self.ninja),
 455                 ("CODEGEN_TESTS", self.codegen_tests),
 456                 ("LOCKED_DEPS", self.locked_deps),
 457                 ("VENDOR", self.vendor),
 458                 ("FULL_BOOTSTRAP", self.full_bootstrap),
 459                 ("EXTENDED", self.extended),
 460                 ("SANITIZERS", self.sanitizers),
 461                 ("DIST_SRC", self.rust_dist_src),
 462                 ("CARGO_OPENSSL_STATIC", self.openssl_static),
 463             }
 464
 465             match key {
 466                 "CFG_BUILD" => self.build = value.to_string(),
 467                 "CFG_HOST" => {
 468                     self.host = value.split(" ").map(|s| s.to_string())
 469                                      .collect();
 470                 }
 471                 "CFG_TARGET" => {
 472                     self.target = value.split(" ").map(|s| s.to_string())
 473                                        .collect();
 474                 }
 475                 "CFG_MUSL_ROOT" if value.len() > 0 => {
 476                     self.musl_root = Some(parse_configure_path(value));
 477                 }
 478                 "CFG_MUSL_ROOT_X86_64" if value.len() > 0 => {
 479                     let target = "x86_64-unknown-linux-musl".to_string();
 480                     let target = self.target_config.entry(target)
 481                                      .or_insert(Target::default());
 482                     target.musl_root = Some(parse_configure_path(value));
 483                 }
 484                 "CFG_MUSL_ROOT_I686" if value.len() > 0 => {
 485                     let target = "i686-unknown-linux-musl".to_string();
 486                     let target = self.target_config.entry(target)
 487                                      .or_insert(Target::default());
 488                     target.musl_root = Some(parse_configure_path(value));
 489                 }
 490                 "CFG_MUSL_ROOT_ARM" if value.len() > 0 => {
 491                     let target = "arm-unknown-linux-musleabi".to_string();
 492                     let target = self.target_config.entry(target)
 493                                      .or_insert(Target::default());
 494                     target.musl_root = Some(parse_configure_path(value));
 495                 }
 496                 "CFG_MUSL_ROOT_ARMHF" if value.len() > 0 => {
 497                     let target = "arm-unknown-linux-musleabihf".to_string();
 498                     let target = self.target_config.entry(target)
 499                                      .or_insert(Target::default());
 500                     target.musl_root = Some(parse_configure_path(value));
 501                 }
 502                 "CFG_MUSL_ROOT_ARMV7" if value.len() > 0 => {
 503                     let target = "armv7-unknown-linux-musleabihf".to_string();
 504                     let target = self.target_config.entry(target)
 505                                      .or_insert(Target::default());
 506                     target.musl_root = Some(parse_configure_path(value));
 507                 }
 508                 "CFG_DEFAULT_AR" if value.len() > 0 => {
 509                     self.rustc_default_ar = Some(value.to_string());
 510                 }
 511                 "CFG_DEFAULT_LINKER" if value.len() > 0 => {
 512                     self.rustc_default_linker = Some(value.to_string());
 513                 }
 514                 "CFG_GDB" if value.len() > 0 => {
 515                     self.gdb = Some(parse_configure_path(value));
 516                 }
 517                 "CFG_RELEASE_CHANNEL" => {
 518                     self.channel = value.to_string();
 519                 }
 520                 "CFG_PREFIX" => {
 521                     self.prefix = Some(PathBuf::from(value));
 522                 }
 523                 "CFG_DOCDIR" => {
 524                     self.docdir = Some(PathBuf::from(value));
 525                 }
 526                 "CFG_LIBDIR" => {
 527                     self.libdir = Some(PathBuf::from(value));
 528                 }
 529                 "CFG_LIBDIR_RELATIVE" => {
 530                     self.libdir_relative = Some(PathBuf::from(value));
 531                 }
 532                 "CFG_MANDIR" => {
 533                     self.mandir = Some(PathBuf::from(value));
 534                 }
 535                 "CFG_LLVM_ROOT" if value.len() > 0 => {
 536                     let target = self.target_config.entry(self.build.clone())
 537                                      .or_insert(Target::default());
 538                     let root = parse_configure_path(value);
 539                     target.llvm_config = Some(push_exe_path(root, &["bin", "llvm-config"]));
 540                 }
 541                 "CFG_JEMALLOC_ROOT" if value.len() > 0 => {
 542                     let target = self.target_config.entry(self.build.clone())
 543                                      .or_insert(Target::default());
 544                     target.jemalloc = Some(parse_configure_path(value).join("libjemalloc_pic.a"));
 545                 }
 546                 "CFG_ARM_LINUX_ANDROIDEABI_NDK" if value.len() > 0 => {
 547                     let target = "arm-linux-androideabi".to_string();
 548                     let target = self.target_config.entry(target)
 549                                      .or_insert(Target::default());
 550                     target.ndk = Some(parse_configure_path(value));
 551                 }
 552                 "CFG_ARMV7_LINUX_ANDROIDEABI_NDK" if value.len() > 0 => {
 553                     let target = "armv7-linux-androideabi".to_string();
 554                     let target = self.target_config.entry(target)
 555                                      .or_insert(Target::default());
 556                     target.ndk = Some(parse_configure_path(value));
 557                 }
 558                 "CFG_I686_LINUX_ANDROID_NDK" if value.len() > 0 => {
 559                     let target = "i686-linux-android".to_string();
 560                     let target = self.target_config.entry(target)
 561                                      .or_insert(Target::default());
 562                     target.ndk = Some(parse_configure_path(value));
 563                 }
 564                 "CFG_AARCH64_LINUX_ANDROID_NDK" if value.len() > 0 => {
 565                     let target = "aarch64-linux-android".to_string();
 566                     let target = self.target_config.entry(target)
 567                                      .or_insert(Target::default());
 568                     target.ndk = Some(parse_configure_path(value));
 569                 }
 570                 "CFG_LOCAL_RUST_ROOT" if value.len() > 0 => {
 571                     let path = parse_configure_path(value);
 572                     self.rustc = Some(push_exe_path(path.clone(), &["bin", "rustc"]));
 573                     self.cargo = Some(push_exe_path(path, &["bin", "cargo"]));
 574                 }
 575                 "CFG_PYTHON" if value.len() > 0 => {
 576                     let path = parse_configure_path(value);
 577                     self.python = Some(path);
 578                 }
 579                 "CFG_ENABLE_CCACHE" if value == "1" => {
 580                     self.ccache = Some("ccache".to_string());
 581                 }
 582                 "CFG_ENABLE_SCCACHE" if value == "1" => {
 583                     self.ccache = Some("sccache".to_string());
 584                 }
 585                 "CFG_CONFIGURE_ARGS" if value.len() > 0 => {
 586                     self.configure_args = value.split_whitespace()
 587                                                .map(|s| s.to_string())
 588                                                .collect();
 589                 }
 590                 "CFG_QEMU_ARMHF_ROOTFS" if value.len() > 0 => {
 591                     let target = "arm-unknown-linux-gnueabihf".to_string();
 592                     let target = self.target_config.entry(target)
 593                                      .or_insert(Target::default());
 594                     target.qemu_rootfs = Some(parse_configure_path(value));
 595                 }
 596                 _ => {}
 597             }
 598         }
 599     }
 600
 601     pub fn verbose(&self) -> bool {
 602         self.verbose > 0
 603     }
 604
 605     pub fn very_verbose(&self) -> bool {
 606         self.verbose > 1
 607     }
 608 }
 609
 610 #[cfg(not(windows))]
 611 fn parse_configure_path(path: &str) -> PathBuf {
 612     path.into()
 613 }
 614
 615 #[cfg(windows)]
 616 fn parse_configure_path(path: &str) -> PathBuf {
 617     // on windows, configure produces unix style paths e.g. /c/some/path but we
 618     // only want real windows paths
 619
 620     use std::process::Command;
 621     use build_helper;
 622
 623     // '/' is invalid in windows paths, so we can detect unix paths by the presence of it
 624     if !path.contains('/') {
 625         return path.into();
 626     }
 627
 628     let win_path = build_helper::output(Command::new("cygpath").arg("-w").arg(path));
 629     let win_path = win_path.trim();
 630
 631     win_path.into()
 632 }
 633
 634 fn set<T>(field: &mut T, val: Option<T>) {
 635     if let Some(v) = val {
 636         *field = v;
 637     }
 638 }