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 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 low_priority: bool,
  98     pub channel: String,
  99     pub quiet_tests: bool,
 100     // Fallback musl-root for all targets
 101     pub musl_root: Option<PathBuf>,
 102     pub prefix: Option<PathBuf>,
 103     pub sysconfdir: Option<PathBuf>,
 104     pub docdir: Option<PathBuf>,
 105     pub bindir: Option<PathBuf>,
 106     pub libdir: Option<PathBuf>,
 107     pub libdir_relative: Option<PathBuf>,
 108     pub mandir: Option<PathBuf>,
 109     pub codegen_tests: bool,
 110     pub nodejs: Option<PathBuf>,
 111     pub gdb: Option<PathBuf>,
 112     pub python: Option<PathBuf>,
 113     pub configure_args: Vec<String>,
 114     pub openssl_static: bool,
 115 }
 116
 117 /// Per-target configuration stored in the global configuration structure.
 118 #[derive(Default)]
 119 pub struct Target {
 120     pub llvm_config: Option<PathBuf>,
 121     pub jemalloc: Option<PathBuf>,
 122     pub cc: Option<PathBuf>,
 123     pub cxx: Option<PathBuf>,
 124     pub ndk: Option<PathBuf>,
 125     pub musl_root: Option<PathBuf>,
 126     pub qemu_rootfs: Option<PathBuf>,
 127 }
 128
 129 /// Structure of the `config.toml` file that configuration is read from.
 130 ///
 131 /// This structure uses `Decodable` to automatically decode a TOML configuration
 132 /// file into this format, and then this is traversed and written into the above
 133 /// `Config` structure.
 134 #[derive(RustcDecodable, Default)]
 135 struct TomlConfig {
 136     build: Option<Build>,
 137     install: Option<Install>,
 138     llvm: Option<Llvm>,
 139     rust: Option<Rust>,
 140     target: Option<HashMap<String, TomlTarget>>,
 141     dist: Option<Dist>,
 142 }
 143
 144 /// TOML representation of various global build decisions.
 145 #[derive(RustcDecodable, Default, Clone)]
 146 struct Build {
 147     build: Option<String>,
 148     host: Vec<String>,
 149     target: Vec<String>,
 150     cargo: Option<String>,
 151     rustc: Option<String>,
 152     low_priority: Option<bool>,
 153     compiler_docs: Option<bool>,
 154     docs: Option<bool>,
 155     submodules: Option<bool>,
 156     gdb: Option<String>,
 157     locked_deps: Option<bool>,
 158     vendor: Option<bool>,
 159     nodejs: Option<String>,
 160     python: Option<String>,
 161     full_bootstrap: Option<bool>,
 162     extended: Option<bool>,
 163     verbose: Option<usize>,
 164     sanitizers: Option<bool>,
 165     openssl_static: Option<bool>,
 166 }
 167
 168 /// TOML representation of various global install decisions.
 169 #[derive(RustcDecodable, Default, Clone)]
 170 struct Install {
 171     prefix: Option<String>,
 172     sysconfdir: Option<String>,
 173     docdir: Option<String>,
 174     bindir: Option<String>,
 175     libdir: Option<String>,
 176     mandir: Option<String>,
 177 }
 178
 179 /// TOML representation of how the LLVM build is configured.
 180 #[derive(RustcDecodable, Default)]
 181 struct Llvm {
 182     ccache: Option<StringOrBool>,
 183     ninja: Option<bool>,
 184     assertions: Option<bool>,
 185     optimize: Option<bool>,
 186     release_debuginfo: Option<bool>,
 187     version_check: Option<bool>,
 188     static_libstdcpp: Option<bool>,
 189     targets: Option<String>,
 190     link_jobs: Option<u32>,
 191     clean_rebuild: Option<bool>,
 192 }
 193
 194 #[derive(RustcDecodable, Default, Clone)]
 195 struct Dist {
 196     sign_folder: Option<String>,
 197     gpg_password_file: Option<String>,
 198     upload_addr: Option<String>,
 199     src_tarball: Option<bool>,
 200 }
 201
 202 #[derive(RustcDecodable)]
 203 enum StringOrBool {
 204     String(String),
 205     Bool(bool),
 206 }
 207
 208 impl Default for StringOrBool {
 209     fn default() -> StringOrBool {
 210         StringOrBool::Bool(false)
 211     }
 212 }
 213
 214 /// TOML representation of how the Rust build is configured.
 215 #[derive(RustcDecodable, Default)]
 216 struct Rust {
 217     optimize: Option<bool>,
 218     codegen_units: Option<u32>,
 219     debug_assertions: Option<bool>,
 220     debuginfo: Option<bool>,
 221     debuginfo_lines: Option<bool>,
 222     debuginfo_only_std: Option<bool>,
 223     debug_jemalloc: Option<bool>,
 224     use_jemalloc: Option<bool>,
 225     backtrace: Option<bool>,
 226     default_linker: Option<String>,
 227     default_ar: Option<String>,
 228     channel: Option<String>,
 229     musl_root: Option<String>,
 230     rpath: Option<bool>,
 231     optimize_tests: Option<bool>,
 232     debuginfo_tests: Option<bool>,
 233     codegen_tests: Option<bool>,
 234 }
 235
 236 /// TOML representation of how each build target is configured.
 237 #[derive(RustcDecodable, Default)]
 238 struct TomlTarget {
 239     llvm_config: Option<String>,
 240     jemalloc: Option<String>,
 241     cc: Option<String>,
 242     cxx: Option<String>,
 243     android_ndk: Option<String>,
 244     musl_root: Option<String>,
 245     qemu_rootfs: Option<String>,
 246 }
 247
 248 impl Config {
 249     pub fn parse(build: &str, file: Option<PathBuf>) -> Config {
 250         let mut config = Config::default();
 251         config.llvm_optimize = true;
 252         config.use_jemalloc = true;
 253         config.backtrace = true;
 254         config.rust_optimize = true;
 255         config.rust_optimize_tests = true;
 256         config.submodules = true;
 257         config.docs = true;
 258         config.rust_rpath = true;
 259         config.rust_codegen_units = 1;
 260         config.build = build.to_string();
 261         config.channel = "dev".to_string();
 262         config.codegen_tests = true;
 263         config.rust_dist_src = true;
 264
 265         let toml = file.map(|file| {
 266             let mut f = t!(File::open(&file));
 267             let mut toml = String::new();
 268             t!(f.read_to_string(&mut toml));
 269             let mut p = Parser::new(&toml);
 270             let table = match p.parse() {
 271                 Some(table) => table,
 272                 None => {
 273                     println!("failed to parse TOML configuration '{}':", file.to_str().unwrap());
 274                     for err in p.errors.iter() {
 275                         let (loline, locol) = p.to_linecol(err.lo);
 276                         let (hiline, hicol) = p.to_linecol(err.hi);
 277                         println!("{}:{}-{}:{}: {}", loline, locol, hiline,
 278                                  hicol, err.desc);
 279                     }
 280                     process::exit(2);
 281                 }
 282             };
 283             let mut d = Decoder::new(Value::Table(table));
 284             match Decodable::decode(&mut d) {
 285                 Ok(cfg) => cfg,
 286                 Err(e) => {
 287                     println!("failed to decode TOML: {}", e);
 288                     process::exit(2);
 289                 }
 290             }
 291         }).unwrap_or_else(|| TomlConfig::default());
 292
 293         let build = toml.build.clone().unwrap_or(Build::default());
 294         set(&mut config.build, build.build.clone());
 295         config.host.push(config.build.clone());
 296         for host in build.host.iter() {
 297             if !config.host.contains(host) {
 298                 config.host.push(host.clone());
 299             }
 300         }
 301         for target in config.host.iter().chain(&build.target) {
 302             if !config.target.contains(target) {
 303                 config.target.push(target.clone());
 304             }
 305         }
 306         config.rustc = build.rustc.map(PathBuf::from);
 307         config.cargo = build.cargo.map(PathBuf::from);
 308         config.nodejs = build.nodejs.map(PathBuf::from);
 309         config.gdb = build.gdb.map(PathBuf::from);
 310         config.python = build.python.map(PathBuf::from);
 311         set(&mut config.low_priority, build.low_priority);
 312         set(&mut config.compiler_docs, build.compiler_docs);
 313         set(&mut config.docs, build.docs);
 314         set(&mut config.submodules, build.submodules);
 315         set(&mut config.locked_deps, build.locked_deps);
 316         set(&mut config.vendor, build.vendor);
 317         set(&mut config.full_bootstrap, build.full_bootstrap);
 318         set(&mut config.extended, build.extended);
 319         set(&mut config.verbose, build.verbose);
 320         set(&mut config.sanitizers, build.sanitizers);
 321         set(&mut config.openssl_static, build.openssl_static);
 322
 323         if let Some(ref install) = toml.install {
 324             config.prefix = install.prefix.clone().map(PathBuf::from);
 325             config.sysconfdir = install.sysconfdir.clone().map(PathBuf::from);
 326             config.docdir = install.docdir.clone().map(PathBuf::from);
 327             config.bindir = install.bindir.clone().map(PathBuf::from);
 328             config.libdir = install.libdir.clone().map(PathBuf::from);
 329             config.mandir = install.mandir.clone().map(PathBuf::from);
 330         }
 331
 332         if let Some(ref llvm) = toml.llvm {
 333             match llvm.ccache {
 334                 Some(StringOrBool::String(ref s)) => {
 335                     config.ccache = Some(s.to_string())
 336                 }
 337                 Some(StringOrBool::Bool(true)) => {
 338                     config.ccache = Some("ccache".to_string());
 339                 }
 340                 Some(StringOrBool::Bool(false)) | None => {}
 341             }
 342             set(&mut config.ninja, llvm.ninja);
 343             set(&mut config.llvm_assertions, llvm.assertions);
 344             set(&mut config.llvm_optimize, llvm.optimize);
 345             set(&mut config.llvm_release_debuginfo, llvm.release_debuginfo);
 346             set(&mut config.llvm_version_check, llvm.version_check);
 347             set(&mut config.llvm_static_stdcpp, llvm.static_libstdcpp);
 348             set(&mut config.llvm_clean_rebuild, llvm.clean_rebuild);
 349             config.llvm_targets = llvm.targets.clone();
 350             config.llvm_link_jobs = llvm.link_jobs;
 351         }
 352
 353         if let Some(ref rust) = toml.rust {
 354             set(&mut config.rust_debug_assertions, rust.debug_assertions);
 355             set(&mut config.rust_debuginfo, rust.debuginfo);
 356             set(&mut config.rust_debuginfo_lines, rust.debuginfo_lines);
 357             set(&mut config.rust_debuginfo_only_std, rust.debuginfo_only_std);
 358             set(&mut config.rust_optimize, rust.optimize);
 359             set(&mut config.rust_optimize_tests, rust.optimize_tests);
 360             set(&mut config.rust_debuginfo_tests, rust.debuginfo_tests);
 361             set(&mut config.codegen_tests, rust.codegen_tests);
 362             set(&mut config.rust_rpath, rust.rpath);
 363             set(&mut config.debug_jemalloc, rust.debug_jemalloc);
 364             set(&mut config.use_jemalloc, rust.use_jemalloc);
 365             set(&mut config.backtrace, rust.backtrace);
 366             set(&mut config.channel, rust.channel.clone());
 367             config.rustc_default_linker = rust.default_linker.clone();
 368             config.rustc_default_ar = rust.default_ar.clone();
 369             config.musl_root = rust.musl_root.clone().map(PathBuf::from);
 370
 371             match rust.codegen_units {
 372                 Some(0) => config.rust_codegen_units = num_cpus::get() as u32,
 373                 Some(n) => config.rust_codegen_units = n,
 374                 None => {}
 375             }
 376         }
 377
 378         if let Some(ref t) = toml.target {
 379             for (triple, cfg) in t {
 380                 let mut target = Target::default();
 381
 382                 if let Some(ref s) = cfg.llvm_config {
 383                     target.llvm_config = Some(env::current_dir().unwrap().join(s));
 384                 }
 385                 if let Some(ref s) = cfg.jemalloc {
 386                     target.jemalloc = Some(env::current_dir().unwrap().join(s));
 387                 }
 388                 if let Some(ref s) = cfg.android_ndk {
 389                     target.ndk = Some(env::current_dir().unwrap().join(s));
 390                 }
 391                 target.cxx = cfg.cxx.clone().map(PathBuf::from);
 392                 target.cc = cfg.cc.clone().map(PathBuf::from);
 393                 target.musl_root = cfg.musl_root.clone().map(PathBuf::from);
 394                 target.qemu_rootfs = cfg.qemu_rootfs.clone().map(PathBuf::from);
 395
 396                 config.target_config.insert(triple.clone(), target);
 397             }
 398         }
 399
 400         if let Some(ref t) = toml.dist {
 401             config.dist_sign_folder = t.sign_folder.clone().map(PathBuf::from);
 402             config.dist_gpg_password_file = t.gpg_password_file.clone().map(PathBuf::from);
 403             config.dist_upload_addr = t.upload_addr.clone();
 404             set(&mut config.rust_dist_src, t.src_tarball);
 405         }
 406
 407
 408         // compat with `./configure` while we're still using that
 409         if fs::metadata("config.mk").is_ok() {
 410             config.update_with_config_mk();
 411         }
 412
 413         return config
 414     }
 415
 416     /// "Temporary" routine to parse `config.mk` into this configuration.
 417     ///
 418     /// While we still have `./configure` this implements the ability to decode
 419     /// that configuration into this. This isn't exactly a full-blown makefile
 420     /// parser, but hey it gets the job done!
 421     fn update_with_config_mk(&mut self) {
 422         let mut config = String::new();
 423         File::open("config.mk").unwrap().read_to_string(&mut config).unwrap();
 424         for line in config.lines() {
 425             let mut parts = line.splitn(2, ":=").map(|s| s.trim());
 426             let key = parts.next().unwrap();
 427             let value = match parts.next() {
 428                 Some(n) if n.starts_with('\"') => &n[1..n.len() - 1],
 429                 Some(n) => n,
 430                 None => continue
 431             };
 432
 433             macro_rules! check {
 434                 ($(($name:expr, $val:expr),)*) => {
 435                     if value == "1" {
 436                         $(
 437                             if key == concat!("CFG_ENABLE_", $name) {
 438                                 $val = true;
 439                                 continue
 440                             }
 441                             if key == concat!("CFG_DISABLE_", $name) {
 442                                 $val = false;
 443                                 continue
 444                             }
 445                         )*
 446                     }
 447                 }
 448             }
 449
 450             check! {
 451                 ("MANAGE_SUBMODULES", self.submodules),
 452                 ("COMPILER_DOCS", self.compiler_docs),
 453                 ("DOCS", self.docs),
 454                 ("LLVM_ASSERTIONS", self.llvm_assertions),
 455                 ("LLVM_RELEASE_DEBUGINFO", self.llvm_release_debuginfo),
 456                 ("OPTIMIZE_LLVM", self.llvm_optimize),
 457                 ("LLVM_VERSION_CHECK", self.llvm_version_check),
 458                 ("LLVM_STATIC_STDCPP", self.llvm_static_stdcpp),
 459                 ("LLVM_LINK_SHARED", self.llvm_link_shared),
 460                 ("LLVM_CLEAN_REBUILD", self.llvm_clean_rebuild),
 461                 ("OPTIMIZE", self.rust_optimize),
 462                 ("DEBUG_ASSERTIONS", self.rust_debug_assertions),
 463                 ("DEBUGINFO", self.rust_debuginfo),
 464                 ("DEBUGINFO_LINES", self.rust_debuginfo_lines),
 465                 ("DEBUGINFO_ONLY_STD", self.rust_debuginfo_only_std),
 466                 ("JEMALLOC", self.use_jemalloc),
 467                 ("DEBUG_JEMALLOC", self.debug_jemalloc),
 468                 ("RPATH", self.rust_rpath),
 469                 ("OPTIMIZE_TESTS", self.rust_optimize_tests),
 470                 ("DEBUGINFO_TESTS", self.rust_debuginfo_tests),
 471                 ("QUIET_TESTS", self.quiet_tests),
 472                 ("LOCAL_REBUILD", self.local_rebuild),
 473                 ("NINJA", self.ninja),
 474                 ("CODEGEN_TESTS", self.codegen_tests),
 475                 ("LOCKED_DEPS", self.locked_deps),
 476                 ("VENDOR", self.vendor),
 477                 ("FULL_BOOTSTRAP", self.full_bootstrap),
 478                 ("EXTENDED", self.extended),
 479                 ("SANITIZERS", self.sanitizers),
 480                 ("DIST_SRC", self.rust_dist_src),
 481                 ("CARGO_OPENSSL_STATIC", self.openssl_static),
 482             }
 483
 484             match key {
 485                 "CFG_BUILD" if value.len() > 0 => self.build = value.to_string(),
 486                 "CFG_HOST" if value.len() > 0 => {
 487                     self.host.extend(value.split(" ").map(|s| s.to_string()));
 488
 489                 }
 490                 "CFG_TARGET" if value.len() > 0 => {
 491                     self.target.extend(value.split(" ").map(|s| s.to_string()));
 492                 }
 493                 "CFG_MUSL_ROOT" if value.len() > 0 => {
 494                     self.musl_root = Some(parse_configure_path(value));
 495                 }
 496                 "CFG_MUSL_ROOT_X86_64" if value.len() > 0 => {
 497                     let target = "x86_64-unknown-linux-musl".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_I686" if value.len() > 0 => {
 503                     let target = "i686-unknown-linux-musl".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_MUSL_ROOT_ARM" if value.len() > 0 => {
 509                     let target = "arm-unknown-linux-musleabi".to_string();
 510                     let target = self.target_config.entry(target)
 511                                      .or_insert(Target::default());
 512                     target.musl_root = Some(parse_configure_path(value));
 513                 }
 514                 "CFG_MUSL_ROOT_ARMHF" if value.len() > 0 => {
 515                     let target = "arm-unknown-linux-musleabihf".to_string();
 516                     let target = self.target_config.entry(target)
 517                                      .or_insert(Target::default());
 518                     target.musl_root = Some(parse_configure_path(value));
 519                 }
 520                 "CFG_MUSL_ROOT_ARMV7" if value.len() > 0 => {
 521                     let target = "armv7-unknown-linux-musleabihf".to_string();
 522                     let target = self.target_config.entry(target)
 523                                      .or_insert(Target::default());
 524                     target.musl_root = Some(parse_configure_path(value));
 525                 }
 526                 "CFG_DEFAULT_AR" if value.len() > 0 => {
 527                     self.rustc_default_ar = Some(value.to_string());
 528                 }
 529                 "CFG_DEFAULT_LINKER" if value.len() > 0 => {
 530                     self.rustc_default_linker = Some(value.to_string());
 531                 }
 532                 "CFG_GDB" if value.len() > 0 => {
 533                     self.gdb = Some(parse_configure_path(value));
 534                 }
 535                 "CFG_RELEASE_CHANNEL" => {
 536                     self.channel = value.to_string();
 537                 }
 538                 "CFG_PREFIX" => {
 539                     self.prefix = Some(PathBuf::from(value));
 540                 }
 541                 "CFG_SYSCONFDIR" => {
 542                     self.sysconfdir = Some(PathBuf::from(value));
 543                 }
 544                 "CFG_DOCDIR" => {
 545                     self.docdir = Some(PathBuf::from(value));
 546                 }
 547                 "CFG_BINDIR" => {
 548                     self.bindir = Some(PathBuf::from(value));
 549                 }
 550                 "CFG_LIBDIR" => {
 551                     self.libdir = Some(PathBuf::from(value));
 552                 }
 553                 "CFG_LIBDIR_RELATIVE" => {
 554                     self.libdir_relative = Some(PathBuf::from(value));
 555                 }
 556                 "CFG_MANDIR" => {
 557                     self.mandir = Some(PathBuf::from(value));
 558                 }
 559                 "CFG_LLVM_ROOT" if value.len() > 0 => {
 560                     let target = self.target_config.entry(self.build.clone())
 561                                      .or_insert(Target::default());
 562                     let root = parse_configure_path(value);
 563                     target.llvm_config = Some(push_exe_path(root, &["bin", "llvm-config"]));
 564                 }
 565                 "CFG_JEMALLOC_ROOT" if value.len() > 0 => {
 566                     let target = self.target_config.entry(self.build.clone())
 567                                      .or_insert(Target::default());
 568                     target.jemalloc = Some(parse_configure_path(value).join("libjemalloc_pic.a"));
 569                 }
 570                 "CFG_ARM_LINUX_ANDROIDEABI_NDK" if value.len() > 0 => {
 571                     let target = "arm-linux-androideabi".to_string();
 572                     let target = self.target_config.entry(target)
 573                                      .or_insert(Target::default());
 574                     target.ndk = Some(parse_configure_path(value));
 575                 }
 576                 "CFG_ARMV7_LINUX_ANDROIDEABI_NDK" if value.len() > 0 => {
 577                     let target = "armv7-linux-androideabi".to_string();
 578                     let target = self.target_config.entry(target)
 579                                      .or_insert(Target::default());
 580                     target.ndk = Some(parse_configure_path(value));
 581                 }
 582                 "CFG_I686_LINUX_ANDROID_NDK" if value.len() > 0 => {
 583                     let target = "i686-linux-android".to_string();
 584                     let target = self.target_config.entry(target)
 585                                      .or_insert(Target::default());
 586                     target.ndk = Some(parse_configure_path(value));
 587                 }
 588                 "CFG_AARCH64_LINUX_ANDROID_NDK" if value.len() > 0 => {
 589                     let target = "aarch64-linux-android".to_string();
 590                     let target = self.target_config.entry(target)
 591                                      .or_insert(Target::default());
 592                     target.ndk = Some(parse_configure_path(value));
 593                 }
 594                 "CFG_X86_64_LINUX_ANDROID_NDK" if value.len() > 0 => {
 595                     let target = "x86_64-linux-android".to_string();
 596                     let target = self.target_config.entry(target)
 597                                      .or_insert(Target::default());
 598                     target.ndk = Some(parse_configure_path(value));
 599                 }
 600                 "CFG_LOCAL_RUST_ROOT" if value.len() > 0 => {
 601                     let path = parse_configure_path(value);
 602                     self.rustc = Some(push_exe_path(path.clone(), &["bin", "rustc"]));
 603                     self.cargo = Some(push_exe_path(path, &["bin", "cargo"]));
 604                 }
 605                 "CFG_PYTHON" if value.len() > 0 => {
 606                     let path = parse_configure_path(value);
 607                     self.python = Some(path);
 608                 }
 609                 "CFG_ENABLE_CCACHE" if value == "1" => {
 610                     self.ccache = Some(exe("ccache", &self.build));
 611                 }
 612                 "CFG_ENABLE_SCCACHE" if value == "1" => {
 613                     self.ccache = Some(exe("sccache", &self.build));
 614                 }
 615                 "CFG_CONFIGURE_ARGS" if value.len() > 0 => {
 616                     self.configure_args = value.split_whitespace()
 617                                                .map(|s| s.to_string())
 618                                                .collect();
 619                 }
 620                 "CFG_QEMU_ARMHF_ROOTFS" if value.len() > 0 => {
 621                     let target = "arm-unknown-linux-gnueabihf".to_string();
 622                     let target = self.target_config.entry(target)
 623                                      .or_insert(Target::default());
 624                     target.qemu_rootfs = Some(parse_configure_path(value));
 625                 }
 626                 _ => {}
 627             }
 628         }
 629     }
 630
 631     pub fn verbose(&self) -> bool {
 632         self.verbose > 0
 633     }
 634
 635     pub fn very_verbose(&self) -> bool {
 636         self.verbose > 1
 637     }
 638 }
 639
 640 #[cfg(not(windows))]
 641 fn parse_configure_path(path: &str) -> PathBuf {
 642     path.into()
 643 }
 644
 645 #[cfg(windows)]
 646 fn parse_configure_path(path: &str) -> PathBuf {
 647     // on windows, configure produces unix style paths e.g. /c/some/path but we
 648     // only want real windows paths
 649
 650     use std::process::Command;
 651     use build_helper;
 652
 653     // '/' is invalid in windows paths, so we can detect unix paths by the presence of it
 654     if !path.contains('/') {
 655         return path.into();
 656     }
 657
 658     let win_path = build_helper::output(Command::new("cygpath").arg("-w").arg(path));
 659     let win_path = win_path.trim();
 660
 661     win_path.into()
 662 }
 663
 664 fn set<T>(field: &mut T, val: Option<T>) {
 665     if let Some(v) = val {
 666         *field = v;
 667     }
 668 }