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