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     pub profiler: bool,
  54
  55     // llvm codegen options
  56     pub llvm_assertions: bool,
  57     pub llvm_optimize: bool,
  58     pub llvm_release_debuginfo: bool,
  59     pub llvm_version_check: bool,
  60     pub llvm_static_stdcpp: bool,
  61     pub llvm_link_shared: bool,
  62     pub llvm_targets: Option<String>,
  63     pub llvm_experimental_targets: Option<String>,
  64     pub llvm_link_jobs: Option<u32>,
  65     pub llvm_clean_rebuild: bool,
  66
  67     // rust codegen options
  68     pub rust_optimize: bool,
  69     pub rust_codegen_units: u32,
  70     pub rust_debug_assertions: bool,
  71     pub rust_debuginfo: bool,
  72     pub rust_debuginfo_lines: bool,
  73     pub rust_debuginfo_only_std: bool,
  74     pub rust_rpath: bool,
  75     pub rustc_default_linker: Option<String>,
  76     pub rustc_default_ar: Option<String>,
  77     pub rust_optimize_tests: bool,
  78     pub rust_debuginfo_tests: bool,
  79     pub rust_dist_src: bool,
  80
  81     pub build: String,
  82     pub host: Vec<String>,
  83     pub target: Vec<String>,
  84     pub rustc: Option<PathBuf>,
  85     pub cargo: Option<PathBuf>,
  86     pub local_rebuild: bool,
  87
  88     // dist misc
  89     pub dist_sign_folder: Option<PathBuf>,
  90     pub dist_upload_addr: Option<String>,
  91     pub dist_gpg_password_file: Option<PathBuf>,
  92
  93     // libstd features
  94     pub debug_jemalloc: bool,
  95     pub use_jemalloc: bool,
  96     pub backtrace: bool, // support for RUST_BACKTRACE
  97
  98     // misc
  99     pub low_priority: bool,
 100     pub channel: String,
 101     pub quiet_tests: bool,
 102     // Fallback musl-root for all targets
 103     pub musl_root: Option<PathBuf>,
 104     pub prefix: Option<PathBuf>,
 105     pub sysconfdir: Option<PathBuf>,
 106     pub docdir: Option<PathBuf>,
 107     pub bindir: Option<PathBuf>,
 108     pub libdir: Option<PathBuf>,
 109     pub libdir_relative: Option<PathBuf>,
 110     pub mandir: Option<PathBuf>,
 111     pub codegen_tests: bool,
 112     pub nodejs: Option<PathBuf>,
 113     pub gdb: Option<PathBuf>,
 114     pub python: Option<PathBuf>,
 115     pub configure_args: Vec<String>,
 116     pub openssl_static: bool,
 117 }
 118
 119 /// Per-target configuration stored in the global configuration structure.
 120 #[derive(Default)]
 121 pub struct Target {
 122     pub llvm_config: Option<PathBuf>,
 123     pub jemalloc: Option<PathBuf>,
 124     pub cc: Option<PathBuf>,
 125     pub cxx: Option<PathBuf>,
 126     pub ndk: Option<PathBuf>,
 127     pub musl_root: Option<PathBuf>,
 128     pub qemu_rootfs: Option<PathBuf>,
 129 }
 130
 131 /// Structure of the `config.toml` file that configuration is read from.
 132 ///
 133 /// This structure uses `Decodable` to automatically decode a TOML configuration
 134 /// file into this format, and then this is traversed and written into the above
 135 /// `Config` structure.
 136 #[derive(RustcDecodable, Default)]
 137 struct TomlConfig {
 138     build: Option<Build>,
 139     install: Option<Install>,
 140     llvm: Option<Llvm>,
 141     rust: Option<Rust>,
 142     target: Option<HashMap<String, TomlTarget>>,
 143     dist: Option<Dist>,
 144 }
 145
 146 /// TOML representation of various global build decisions.
 147 #[derive(RustcDecodable, Default, Clone)]
 148 struct Build {
 149     build: Option<String>,
 150     host: Vec<String>,
 151     target: Vec<String>,
 152     cargo: Option<String>,
 153     rustc: Option<String>,
 154     low_priority: Option<bool>,
 155     compiler_docs: Option<bool>,
 156     docs: Option<bool>,
 157     submodules: Option<bool>,
 158     gdb: Option<String>,
 159     locked_deps: Option<bool>,
 160     vendor: Option<bool>,
 161     nodejs: Option<String>,
 162     python: Option<String>,
 163     full_bootstrap: Option<bool>,
 164     extended: Option<bool>,
 165     verbose: Option<usize>,
 166     sanitizers: Option<bool>,
 167     profiler: Option<bool>,
 168     openssl_static: Option<bool>,
 169 }
 170
 171 /// TOML representation of various global install decisions.
 172 #[derive(RustcDecodable, Default, Clone)]
 173 struct Install {
 174     prefix: Option<String>,
 175     sysconfdir: Option<String>,
 176     docdir: Option<String>,
 177     bindir: Option<String>,
 178     libdir: Option<String>,
 179     mandir: Option<String>,
 180 }
 181
 182 /// TOML representation of how the LLVM build is configured.
 183 #[derive(RustcDecodable, Default)]
 184 struct Llvm {
 185     ccache: Option<StringOrBool>,
 186     ninja: Option<bool>,
 187     assertions: Option<bool>,
 188     optimize: Option<bool>,
 189     release_debuginfo: Option<bool>,
 190     version_check: Option<bool>,
 191     static_libstdcpp: Option<bool>,
 192     targets: Option<String>,
 193     experimental_targets: Option<String>,
 194     link_jobs: Option<u32>,
 195     clean_rebuild: Option<bool>,
 196 }
 197
 198 #[derive(RustcDecodable, Default, Clone)]
 199 struct Dist {
 200     sign_folder: Option<String>,
 201     gpg_password_file: Option<String>,
 202     upload_addr: Option<String>,
 203     src_tarball: Option<bool>,
 204 }
 205
 206 #[derive(RustcDecodable)]
 207 enum StringOrBool {
 208     String(String),
 209     Bool(bool),
 210 }
 211
 212 impl Default for StringOrBool {
 213     fn default() -> StringOrBool {
 214         StringOrBool::Bool(false)
 215     }
 216 }
 217
 218 /// TOML representation of how the Rust build is configured.
 219 #[derive(RustcDecodable, Default)]
 220 struct Rust {
 221     optimize: Option<bool>,
 222     codegen_units: Option<u32>,
 223     debug_assertions: Option<bool>,
 224     debuginfo: Option<bool>,
 225     debuginfo_lines: Option<bool>,
 226     debuginfo_only_std: Option<bool>,
 227     debug_jemalloc: Option<bool>,
 228     use_jemalloc: Option<bool>,
 229     backtrace: Option<bool>,
 230     default_linker: Option<String>,
 231     default_ar: Option<String>,
 232     channel: Option<String>,
 233     musl_root: Option<String>,
 234     rpath: Option<bool>,
 235     optimize_tests: Option<bool>,
 236     debuginfo_tests: Option<bool>,
 237     codegen_tests: Option<bool>,
 238 }
 239
 240 /// TOML representation of how each build target is configured.
 241 #[derive(RustcDecodable, Default)]
 242 struct TomlTarget {
 243     llvm_config: Option<String>,
 244     jemalloc: Option<String>,
 245     cc: Option<String>,
 246     cxx: Option<String>,
 247     android_ndk: Option<String>,
 248     musl_root: Option<String>,
 249     qemu_rootfs: Option<String>,
 250 }
 251
 252 impl Config {
 253     pub fn parse(build: &str, file: Option<PathBuf>) -> Config {
 254         let mut config = Config::default();
 255         config.llvm_optimize = true;
 256         config.use_jemalloc = true;
 257         config.backtrace = true;
 258         config.rust_optimize = true;
 259         config.rust_optimize_tests = true;
 260         config.submodules = true;
 261         config.docs = true;
 262         config.rust_rpath = true;
 263         config.rust_codegen_units = 1;
 264         config.build = build.to_string();
 265         config.channel = "dev".to_string();
 266         config.codegen_tests = true;
 267         config.rust_dist_src = true;
 268
 269         let toml = file.map(|file| {
 270             let mut f = t!(File::open(&file));
 271             let mut toml = String::new();
 272             t!(f.read_to_string(&mut toml));
 273             let mut p = Parser::new(&toml);
 274             let table = match p.parse() {
 275                 Some(table) => table,
 276                 None => {
 277                     println!("failed to parse TOML configuration '{}':", file.to_str().unwrap());
 278                     for err in p.errors.iter() {
 279                         let (loline, locol) = p.to_linecol(err.lo);
 280                         let (hiline, hicol) = p.to_linecol(err.hi);
 281                         println!("{}:{}-{}:{}: {}", loline, locol, hiline,
 282                                  hicol, err.desc);
 283                     }
 284                     process::exit(2);
 285                 }
 286             };
 287             let mut d = Decoder::new(Value::Table(table));
 288             match Decodable::decode(&mut d) {
 289                 Ok(cfg) => cfg,
 290                 Err(e) => {
 291                     println!("failed to decode TOML: {}", e);
 292                     process::exit(2);
 293                 }
 294             }
 295         }).unwrap_or_else(|| TomlConfig::default());
 296
 297         let build = toml.build.clone().unwrap_or(Build::default());
 298         set(&mut config.build, build.build.clone());
 299         config.host.push(config.build.clone());
 300         for host in build.host.iter() {
 301             if !config.host.contains(host) {
 302                 config.host.push(host.clone());
 303             }
 304         }
 305         for target in config.host.iter().chain(&build.target) {
 306             if !config.target.contains(target) {
 307                 config.target.push(target.clone());
 308             }
 309         }
 310         config.rustc = build.rustc.map(PathBuf::from);
 311         config.cargo = build.cargo.map(PathBuf::from);
 312         config.nodejs = build.nodejs.map(PathBuf::from);
 313         config.gdb = build.gdb.map(PathBuf::from);
 314         config.python = build.python.map(PathBuf::from);
 315         set(&mut config.low_priority, build.low_priority);
 316         set(&mut config.compiler_docs, build.compiler_docs);
 317         set(&mut config.docs, build.docs);
 318         set(&mut config.submodules, build.submodules);
 319         set(&mut config.locked_deps, build.locked_deps);
 320         set(&mut config.vendor, build.vendor);
 321         set(&mut config.full_bootstrap, build.full_bootstrap);
 322         set(&mut config.extended, build.extended);
 323         set(&mut config.verbose, build.verbose);
 324         set(&mut config.sanitizers, build.sanitizers);
 325         set(&mut config.profiler, build.profiler);
 326         set(&mut config.openssl_static, build.openssl_static);
 327
 328         if let Some(ref install) = toml.install {
 329             config.prefix = install.prefix.clone().map(PathBuf::from);
 330             config.sysconfdir = install.sysconfdir.clone().map(PathBuf::from);
 331             config.docdir = install.docdir.clone().map(PathBuf::from);
 332             config.bindir = install.bindir.clone().map(PathBuf::from);
 333             config.libdir = install.libdir.clone().map(PathBuf::from);
 334             config.mandir = install.mandir.clone().map(PathBuf::from);
 335         }
 336
 337         if let Some(ref llvm) = toml.llvm {
 338             match llvm.ccache {
 339                 Some(StringOrBool::String(ref s)) => {
 340                     config.ccache = Some(s.to_string())
 341                 }
 342                 Some(StringOrBool::Bool(true)) => {
 343                     config.ccache = Some("ccache".to_string());
 344                 }
 345                 Some(StringOrBool::Bool(false)) | None => {}
 346             }
 347             set(&mut config.ninja, llvm.ninja);
 348             set(&mut config.llvm_assertions, llvm.assertions);
 349             set(&mut config.llvm_optimize, llvm.optimize);
 350             set(&mut config.llvm_release_debuginfo, llvm.release_debuginfo);
 351             set(&mut config.llvm_version_check, llvm.version_check);
 352             set(&mut config.llvm_static_stdcpp, llvm.static_libstdcpp);
 353             set(&mut config.llvm_clean_rebuild, llvm.clean_rebuild);
 354             config.llvm_targets = llvm.targets.clone();
 355             config.llvm_experimental_targets = llvm.experimental_targets.clone();
 356             config.llvm_link_jobs = llvm.link_jobs;
 357         }
 358
 359         if let Some(ref rust) = toml.rust {
 360             set(&mut config.rust_debug_assertions, rust.debug_assertions);
 361             set(&mut config.rust_debuginfo, rust.debuginfo);
 362             set(&mut config.rust_debuginfo_lines, rust.debuginfo_lines);
 363             set(&mut config.rust_debuginfo_only_std, rust.debuginfo_only_std);
 364             set(&mut config.rust_optimize, rust.optimize);
 365             set(&mut config.rust_optimize_tests, rust.optimize_tests);
 366             set(&mut config.rust_debuginfo_tests, rust.debuginfo_tests);
 367             set(&mut config.codegen_tests, rust.codegen_tests);
 368             set(&mut config.rust_rpath, rust.rpath);
 369             set(&mut config.debug_jemalloc, rust.debug_jemalloc);
 370             set(&mut config.use_jemalloc, rust.use_jemalloc);
 371             set(&mut config.backtrace, rust.backtrace);
 372             set(&mut config.channel, rust.channel.clone());
 373             config.rustc_default_linker = rust.default_linker.clone();
 374             config.rustc_default_ar = rust.default_ar.clone();
 375             config.musl_root = rust.musl_root.clone().map(PathBuf::from);
 376
 377             match rust.codegen_units {
 378                 Some(0) => config.rust_codegen_units = num_cpus::get() as u32,
 379                 Some(n) => config.rust_codegen_units = n,
 380                 None => {}
 381             }
 382         }
 383
 384         if let Some(ref t) = toml.target {
 385             for (triple, cfg) in t {
 386                 let mut target = Target::default();
 387
 388                 if let Some(ref s) = cfg.llvm_config {
 389                     target.llvm_config = Some(env::current_dir().unwrap().join(s));
 390                 }
 391                 if let Some(ref s) = cfg.jemalloc {
 392                     target.jemalloc = Some(env::current_dir().unwrap().join(s));
 393                 }
 394                 if let Some(ref s) = cfg.android_ndk {
 395                     target.ndk = Some(env::current_dir().unwrap().join(s));
 396                 }
 397                 target.cxx = cfg.cxx.clone().map(PathBuf::from);
 398                 target.cc = cfg.cc.clone().map(PathBuf::from);
 399                 target.musl_root = cfg.musl_root.clone().map(PathBuf::from);
 400                 target.qemu_rootfs = cfg.qemu_rootfs.clone().map(PathBuf::from);
 401
 402                 config.target_config.insert(triple.clone(), target);
 403             }
 404         }
 405
 406         if let Some(ref t) = toml.dist {
 407             config.dist_sign_folder = t.sign_folder.clone().map(PathBuf::from);
 408             config.dist_gpg_password_file = t.gpg_password_file.clone().map(PathBuf::from);
 409             config.dist_upload_addr = t.upload_addr.clone();
 410             set(&mut config.rust_dist_src, t.src_tarball);
 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     pub 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                 ("PROFILER", self.profiler),
 481                 ("DIST_SRC", self.rust_dist_src),
 482                 ("CARGO_OPENSSL_STATIC", self.openssl_static),
 483             }
 484
 485             match key {
 486                 "CFG_BUILD" if value.len() > 0 => self.build = value.to_string(),
 487                 "CFG_HOST" if value.len() > 0 => {
 488                     self.host.extend(value.split(" ").map(|s| s.to_string()));
 489
 490                 }
 491                 "CFG_TARGET" if value.len() > 0 => {
 492                     self.target.extend(value.split(" ").map(|s| s.to_string()));
 493                 }
 494                 "CFG_MUSL_ROOT" if value.len() > 0 => {
 495                     self.musl_root = Some(parse_configure_path(value));
 496                 }
 497                 "CFG_MUSL_ROOT_X86_64" if value.len() > 0 => {
 498                     let target = "x86_64-unknown-linux-musl".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_I686" if value.len() > 0 => {
 504                     let target = "i686-unknown-linux-musl".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_ARM" if value.len() > 0 => {
 510                     let target = "arm-unknown-linux-musleabi".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_MUSL_ROOT_ARMHF" if value.len() > 0 => {
 516                     let target = "arm-unknown-linux-musleabihf".to_string();
 517                     let target = self.target_config.entry(target)
 518                                      .or_insert(Target::default());
 519                     target.musl_root = Some(parse_configure_path(value));
 520                 }
 521                 "CFG_MUSL_ROOT_ARMV7" if value.len() > 0 => {
 522                     let target = "armv7-unknown-linux-musleabihf".to_string();
 523                     let target = self.target_config.entry(target)
 524                                      .or_insert(Target::default());
 525                     target.musl_root = Some(parse_configure_path(value));
 526                 }
 527                 "CFG_DEFAULT_AR" if value.len() > 0 => {
 528                     self.rustc_default_ar = Some(value.to_string());
 529                 }
 530                 "CFG_DEFAULT_LINKER" if value.len() > 0 => {
 531                     self.rustc_default_linker = Some(value.to_string());
 532                 }
 533                 "CFG_GDB" if value.len() > 0 => {
 534                     self.gdb = Some(parse_configure_path(value));
 535                 }
 536                 "CFG_RELEASE_CHANNEL" => {
 537                     self.channel = value.to_string();
 538                 }
 539                 "CFG_PREFIX" => {
 540                     self.prefix = Some(PathBuf::from(value));
 541                 }
 542                 "CFG_SYSCONFDIR" => {
 543                     self.sysconfdir = Some(PathBuf::from(value));
 544                 }
 545                 "CFG_DOCDIR" => {
 546                     self.docdir = Some(PathBuf::from(value));
 547                 }
 548                 "CFG_BINDIR" => {
 549                     self.bindir = Some(PathBuf::from(value));
 550                 }
 551                 "CFG_LIBDIR" => {
 552                     self.libdir = Some(PathBuf::from(value));
 553                 }
 554                 "CFG_LIBDIR_RELATIVE" => {
 555                     self.libdir_relative = Some(PathBuf::from(value));
 556                 }
 557                 "CFG_MANDIR" => {
 558                     self.mandir = Some(PathBuf::from(value));
 559                 }
 560                 "CFG_LLVM_ROOT" if value.len() > 0 => {
 561                     let target = self.target_config.entry(self.build.clone())
 562                                      .or_insert(Target::default());
 563                     let root = parse_configure_path(value);
 564                     target.llvm_config = Some(push_exe_path(root, &["bin", "llvm-config"]));
 565                 }
 566                 "CFG_JEMALLOC_ROOT" if value.len() > 0 => {
 567                     let target = self.target_config.entry(self.build.clone())
 568                                      .or_insert(Target::default());
 569                     target.jemalloc = Some(parse_configure_path(value).join("libjemalloc_pic.a"));
 570                 }
 571                 "CFG_ARM_LINUX_ANDROIDEABI_NDK" if value.len() > 0 => {
 572                     let target = "arm-linux-androideabi".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_ARMV7_LINUX_ANDROIDEABI_NDK" if value.len() > 0 => {
 578                     let target = "armv7-linux-androideabi".to_string();
 579                     let target = self.target_config.entry(target)
 580                                      .or_insert(Target::default());
 581                     target.ndk = Some(parse_configure_path(value));
 582                 }
 583                 "CFG_I686_LINUX_ANDROID_NDK" if value.len() > 0 => {
 584                     let target = "i686-linux-android".to_string();
 585                     let target = self.target_config.entry(target)
 586                                      .or_insert(Target::default());
 587                     target.ndk = Some(parse_configure_path(value));
 588                 }
 589                 "CFG_AARCH64_LINUX_ANDROID_NDK" if value.len() > 0 => {
 590                     let target = "aarch64-linux-android".to_string();
 591                     let target = self.target_config.entry(target)
 592                                      .or_insert(Target::default());
 593                     target.ndk = Some(parse_configure_path(value));
 594                 }
 595                 "CFG_X86_64_LINUX_ANDROID_NDK" if value.len() > 0 => {
 596                     let target = "x86_64-linux-android".to_string();
 597                     let target = self.target_config.entry(target)
 598                                      .or_insert(Target::default());
 599                     target.ndk = Some(parse_configure_path(value));
 600                 }
 601                 "CFG_LOCAL_RUST_ROOT" if value.len() > 0 => {
 602                     let path = parse_configure_path(value);
 603                     self.rustc = Some(push_exe_path(path.clone(), &["bin", "rustc"]));
 604                     self.cargo = Some(push_exe_path(path, &["bin", "cargo"]));
 605                 }
 606                 "CFG_PYTHON" if value.len() > 0 => {
 607                     let path = parse_configure_path(value);
 608                     self.python = Some(path);
 609                 }
 610                 "CFG_ENABLE_CCACHE" if value == "1" => {
 611                     self.ccache = Some(exe("ccache", &self.build));
 612                 }
 613                 "CFG_ENABLE_SCCACHE" if value == "1" => {
 614                     self.ccache = Some(exe("sccache", &self.build));
 615                 }
 616                 "CFG_CONFIGURE_ARGS" if value.len() > 0 => {
 617                     self.configure_args = value.split_whitespace()
 618                                                .map(|s| s.to_string())
 619                                                .collect();
 620                 }
 621                 "CFG_QEMU_ARMHF_ROOTFS" if value.len() > 0 => {
 622                     let target = "arm-unknown-linux-gnueabihf".to_string();
 623                     let target = self.target_config.entry(target)
 624                                      .or_insert(Target::default());
 625                     target.qemu_rootfs = Some(parse_configure_path(value));
 626                 }
 627                 _ => {}
 628             }
 629         }
 630     }
 631
 632     pub fn verbose(&self) -> bool {
 633         self.verbose > 0
 634     }
 635
 636     pub fn very_verbose(&self) -> bool {
 637         self.verbose > 1
 638     }
 639 }
 640
 641 #[cfg(not(windows))]
 642 fn parse_configure_path(path: &str) -> PathBuf {
 643     path.into()
 644 }
 645
 646 #[cfg(windows)]
 647 fn parse_configure_path(path: &str) -> PathBuf {
 648     // on windows, configure produces unix style paths e.g. /c/some/path but we
 649     // only want real windows paths
 650
 651     use std::process::Command;
 652     use build_helper;
 653
 654     // '/' is invalid in windows paths, so we can detect unix paths by the presence of it
 655     if !path.contains('/') {
 656         return path.into();
 657     }
 658
 659     let win_path = build_helper::output(Command::new("cygpath").arg("-w").arg(path));
 660     let win_path = win_path.trim();
 661
 662     win_path.into()
 663 }
 664
 665 fn set<T>(field: &mut T, val: Option<T>) {
 666     if let Some(v) = val {
 667         *field = v;
 668     }
 669 }