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