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_link_jobs: Option<u32>,
  64     pub llvm_clean_rebuild: bool,
  65
  66     // rust codegen options
  67     pub rust_optimize: bool,
  68     pub rust_codegen_units: u32,
  69     pub rust_debug_assertions: bool,
  70     pub rust_debuginfo: bool,
  71     pub rust_debuginfo_lines: bool,
  72     pub rust_debuginfo_only_std: bool,
  73     pub rust_rpath: bool,
  74     pub rustc_default_linker: Option<String>,
  75     pub rustc_default_ar: Option<String>,
  76     pub rust_optimize_tests: bool,
  77     pub rust_debuginfo_tests: 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 low_priority: bool,
  99     pub channel: String,
 100     pub quiet_tests: bool,
 101     // Fallback musl-root for all targets
 102     pub musl_root: Option<PathBuf>,
 103     pub prefix: Option<PathBuf>,
 104     pub sysconfdir: Option<PathBuf>,
 105     pub docdir: Option<PathBuf>,
 106     pub bindir: Option<PathBuf>,
 107     pub libdir: Option<PathBuf>,
 108     pub libdir_relative: Option<PathBuf>,
 109     pub mandir: Option<PathBuf>,
 110     pub codegen_tests: bool,
 111     pub nodejs: Option<PathBuf>,
 112     pub gdb: Option<PathBuf>,
 113     pub python: Option<PathBuf>,
 114     pub configure_args: Vec<String>,
 115     pub openssl_static: bool,
 116 }
 117
 118 /// Per-target configuration stored in the global configuration structure.
 119 #[derive(Default)]
 120 pub struct Target {
 121     pub llvm_config: Option<PathBuf>,
 122     pub jemalloc: Option<PathBuf>,
 123     pub cc: Option<PathBuf>,
 124     pub cxx: Option<PathBuf>,
 125     pub ndk: Option<PathBuf>,
 126     pub musl_root: Option<PathBuf>,
 127     pub qemu_rootfs: Option<PathBuf>,
 128 }
 129
 130 /// Structure of the `config.toml` file that configuration is read from.
 131 ///
 132 /// This structure uses `Decodable` to automatically decode a TOML configuration
 133 /// file into this format, and then this is traversed and written into the above
 134 /// `Config` structure.
 135 #[derive(RustcDecodable, Default)]
 136 struct TomlConfig {
 137     build: Option<Build>,
 138     install: Option<Install>,
 139     llvm: Option<Llvm>,
 140     rust: Option<Rust>,
 141     target: Option<HashMap<String, TomlTarget>>,
 142     dist: Option<Dist>,
 143 }
 144
 145 /// TOML representation of various global build decisions.
 146 #[derive(RustcDecodable, Default, Clone)]
 147 struct Build {
 148     build: Option<String>,
 149     host: Vec<String>,
 150     target: Vec<String>,
 151     cargo: Option<String>,
 152     rustc: Option<String>,
 153     low_priority: Option<bool>,
 154     compiler_docs: Option<bool>,
 155     docs: Option<bool>,
 156     submodules: Option<bool>,
 157     gdb: Option<String>,
 158     locked_deps: Option<bool>,
 159     vendor: Option<bool>,
 160     nodejs: Option<String>,
 161     python: Option<String>,
 162     full_bootstrap: Option<bool>,
 163     extended: Option<bool>,
 164     verbose: Option<usize>,
 165     sanitizers: Option<bool>,
 166     profiler: Option<bool>,
 167     openssl_static: Option<bool>,
 168 }
 169
 170 /// TOML representation of various global install decisions.
 171 #[derive(RustcDecodable, Default, Clone)]
 172 struct Install {
 173     prefix: Option<String>,
 174     sysconfdir: Option<String>,
 175     docdir: Option<String>,
 176     bindir: Option<String>,
 177     libdir: Option<String>,
 178     mandir: Option<String>,
 179 }
 180
 181 /// TOML representation of how the LLVM build is configured.
 182 #[derive(RustcDecodable, Default)]
 183 struct Llvm {
 184     ccache: Option<StringOrBool>,
 185     ninja: Option<bool>,
 186     assertions: Option<bool>,
 187     optimize: Option<bool>,
 188     release_debuginfo: Option<bool>,
 189     version_check: Option<bool>,
 190     static_libstdcpp: Option<bool>,
 191     targets: Option<String>,
 192     link_jobs: Option<u32>,
 193     clean_rebuild: Option<bool>,
 194 }
 195
 196 #[derive(RustcDecodable, Default, Clone)]
 197 struct Dist {
 198     sign_folder: Option<String>,
 199     gpg_password_file: Option<String>,
 200     upload_addr: Option<String>,
 201     src_tarball: Option<bool>,
 202 }
 203
 204 #[derive(RustcDecodable)]
 205 enum StringOrBool {
 206     String(String),
 207     Bool(bool),
 208 }
 209
 210 impl Default for StringOrBool {
 211     fn default() -> StringOrBool {
 212         StringOrBool::Bool(false)
 213     }
 214 }
 215
 216 /// TOML representation of how the Rust build is configured.
 217 #[derive(RustcDecodable, Default)]
 218 struct Rust {
 219     optimize: Option<bool>,
 220     codegen_units: Option<u32>,
 221     debug_assertions: Option<bool>,
 222     debuginfo: Option<bool>,
 223     debuginfo_lines: Option<bool>,
 224     debuginfo_only_std: Option<bool>,
 225     debug_jemalloc: Option<bool>,
 226     use_jemalloc: Option<bool>,
 227     backtrace: Option<bool>,
 228     default_linker: Option<String>,
 229     default_ar: Option<String>,
 230     channel: Option<String>,
 231     musl_root: Option<String>,
 232     rpath: Option<bool>,
 233     optimize_tests: Option<bool>,
 234     debuginfo_tests: Option<bool>,
 235     codegen_tests: Option<bool>,
 236 }
 237
 238 /// TOML representation of how each build target is configured.
 239 #[derive(RustcDecodable, Default)]
 240 struct TomlTarget {
 241     llvm_config: Option<String>,
 242     jemalloc: Option<String>,
 243     cc: Option<String>,
 244     cxx: Option<String>,
 245     android_ndk: Option<String>,
 246     musl_root: Option<String>,
 247     qemu_rootfs: Option<String>,
 248 }
 249
 250 impl Config {
 251     pub fn parse(build: &str, file: Option<PathBuf>) -> Config {
 252         let mut config = Config::default();
 253         config.llvm_optimize = true;
 254         config.use_jemalloc = true;
 255         config.backtrace = true;
 256         config.rust_optimize = true;
 257         config.rust_optimize_tests = true;
 258         config.submodules = true;
 259         config.docs = true;
 260         config.rust_rpath = true;
 261         config.rust_codegen_units = 1;
 262         config.build = build.to_string();
 263         config.channel = "dev".to_string();
 264         config.codegen_tests = true;
 265         config.rust_dist_src = true;
 266
 267         let toml = file.map(|file| {
 268             let mut f = t!(File::open(&file));
 269             let mut toml = String::new();
 270             t!(f.read_to_string(&mut toml));
 271             let mut p = Parser::new(&toml);
 272             let table = match p.parse() {
 273                 Some(table) => table,
 274                 None => {
 275                     println!("failed to parse TOML configuration '{}':", file.to_str().unwrap());
 276                     for err in p.errors.iter() {
 277                         let (loline, locol) = p.to_linecol(err.lo);
 278                         let (hiline, hicol) = p.to_linecol(err.hi);
 279                         println!("{}:{}-{}:{}: {}", loline, locol, hiline,
 280                                  hicol, err.desc);
 281                     }
 282                     process::exit(2);
 283                 }
 284             };
 285             let mut d = Decoder::new(Value::Table(table));
 286             match Decodable::decode(&mut d) {
 287                 Ok(cfg) => cfg,
 288                 Err(e) => {
 289                     println!("failed to decode TOML: {}", e);
 290                     process::exit(2);
 291                 }
 292             }
 293         }).unwrap_or_else(|| TomlConfig::default());
 294
 295         let build = toml.build.clone().unwrap_or(Build::default());
 296         set(&mut config.build, build.build.clone());
 297         config.host.push(config.build.clone());
 298         for host in build.host.iter() {
 299             if !config.host.contains(host) {
 300                 config.host.push(host.clone());
 301             }
 302         }
 303         for target in config.host.iter().chain(&build.target) {
 304             if !config.target.contains(target) {
 305                 config.target.push(target.clone());
 306             }
 307         }
 308         config.rustc = build.rustc.map(PathBuf::from);
 309         config.cargo = build.cargo.map(PathBuf::from);
 310         config.nodejs = build.nodejs.map(PathBuf::from);
 311         config.gdb = build.gdb.map(PathBuf::from);
 312         config.python = build.python.map(PathBuf::from);
 313         set(&mut config.low_priority, build.low_priority);
 314         set(&mut config.compiler_docs, build.compiler_docs);
 315         set(&mut config.docs, build.docs);
 316         set(&mut config.submodules, build.submodules);
 317         set(&mut config.locked_deps, build.locked_deps);
 318         set(&mut config.vendor, build.vendor);
 319         set(&mut config.full_bootstrap, build.full_bootstrap);
 320         set(&mut config.extended, build.extended);
 321         set(&mut config.verbose, build.verbose);
 322         set(&mut config.sanitizers, build.sanitizers);
 323         set(&mut config.profiler, build.profiler);
 324         set(&mut config.openssl_static, build.openssl_static);
 325
 326         if let Some(ref install) = toml.install {
 327             config.prefix = install.prefix.clone().map(PathBuf::from);
 328             config.sysconfdir = install.sysconfdir.clone().map(PathBuf::from);
 329             config.docdir = install.docdir.clone().map(PathBuf::from);
 330             config.bindir = install.bindir.clone().map(PathBuf::from);
 331             config.libdir = install.libdir.clone().map(PathBuf::from);
 332             config.mandir = install.mandir.clone().map(PathBuf::from);
 333         }
 334
 335         if let Some(ref llvm) = toml.llvm {
 336             match llvm.ccache {
 337                 Some(StringOrBool::String(ref s)) => {
 338                     config.ccache = Some(s.to_string())
 339                 }
 340                 Some(StringOrBool::Bool(true)) => {
 341                     config.ccache = Some("ccache".to_string());
 342                 }
 343                 Some(StringOrBool::Bool(false)) | None => {}
 344             }
 345             set(&mut config.ninja, llvm.ninja);
 346             set(&mut config.llvm_assertions, llvm.assertions);
 347             set(&mut config.llvm_optimize, llvm.optimize);
 348             set(&mut config.llvm_release_debuginfo, llvm.release_debuginfo);
 349             set(&mut config.llvm_version_check, llvm.version_check);
 350             set(&mut config.llvm_static_stdcpp, llvm.static_libstdcpp);
 351             set(&mut config.llvm_clean_rebuild, llvm.clean_rebuild);
 352             config.llvm_targets = llvm.targets.clone();
 353             config.llvm_link_jobs = llvm.link_jobs;
 354         }
 355
 356         if let Some(ref rust) = toml.rust {
 357             set(&mut config.rust_debug_assertions, rust.debug_assertions);
 358             set(&mut config.rust_debuginfo, rust.debuginfo);
 359             set(&mut config.rust_debuginfo_lines, rust.debuginfo_lines);
 360             set(&mut config.rust_debuginfo_only_std, rust.debuginfo_only_std);
 361             set(&mut config.rust_optimize, rust.optimize);
 362             set(&mut config.rust_optimize_tests, rust.optimize_tests);
 363             set(&mut config.rust_debuginfo_tests, rust.debuginfo_tests);
 364             set(&mut config.codegen_tests, rust.codegen_tests);
 365             set(&mut config.rust_rpath, rust.rpath);
 366             set(&mut config.debug_jemalloc, rust.debug_jemalloc);
 367             set(&mut config.use_jemalloc, rust.use_jemalloc);
 368             set(&mut config.backtrace, rust.backtrace);
 369             set(&mut config.channel, rust.channel.clone());
 370             config.rustc_default_linker = rust.default_linker.clone();
 371             config.rustc_default_ar = rust.default_ar.clone();
 372             config.musl_root = rust.musl_root.clone().map(PathBuf::from);
 373
 374             match rust.codegen_units {
 375                 Some(0) => config.rust_codegen_units = num_cpus::get() as u32,
 376                 Some(n) => config.rust_codegen_units = n,
 377                 None => {}
 378             }
 379         }
 380
 381         if let Some(ref t) = toml.target {
 382             for (triple, cfg) in t {
 383                 let mut target = Target::default();
 384
 385                 if let Some(ref s) = cfg.llvm_config {
 386                     target.llvm_config = Some(env::current_dir().unwrap().join(s));
 387                 }
 388                 if let Some(ref s) = cfg.jemalloc {
 389                     target.jemalloc = Some(env::current_dir().unwrap().join(s));
 390                 }
 391                 if let Some(ref s) = cfg.android_ndk {
 392                     target.ndk = Some(env::current_dir().unwrap().join(s));
 393                 }
 394                 target.cxx = cfg.cxx.clone().map(PathBuf::from);
 395                 target.cc = cfg.cc.clone().map(PathBuf::from);
 396                 target.musl_root = cfg.musl_root.clone().map(PathBuf::from);
 397                 target.qemu_rootfs = cfg.qemu_rootfs.clone().map(PathBuf::from);
 398
 399                 config.target_config.insert(triple.clone(), target);
 400             }
 401         }
 402
 403         if let Some(ref t) = toml.dist {
 404             config.dist_sign_folder = t.sign_folder.clone().map(PathBuf::from);
 405             config.dist_gpg_password_file = t.gpg_password_file.clone().map(PathBuf::from);
 406             config.dist_upload_addr = t.upload_addr.clone();
 407             set(&mut config.rust_dist_src, t.src_tarball);
 408         }
 409
 410         return config
 411     }
 412
 413     /// "Temporary" routine to parse `config.mk` into this configuration.
 414     ///
 415     /// While we still have `./configure` this implements the ability to decode
 416     /// that configuration into this. This isn't exactly a full-blown makefile
 417     /// parser, but hey it gets the job done!
 418     pub fn update_with_config_mk(&mut self) {
 419         let mut config = String::new();
 420         File::open("config.mk").unwrap().read_to_string(&mut config).unwrap();
 421         for line in config.lines() {
 422             let mut parts = line.splitn(2, ":=").map(|s| s.trim());
 423             let key = parts.next().unwrap();
 424             let value = match parts.next() {
 425                 Some(n) if n.starts_with('\"') => &n[1..n.len() - 1],
 426                 Some(n) => n,
 427                 None => continue
 428             };
 429
 430             macro_rules! check {
 431                 ($(($name:expr, $val:expr),)*) => {
 432                     if value == "1" {
 433                         $(
 434                             if key == concat!("CFG_ENABLE_", $name) {
 435                                 $val = true;
 436                                 continue
 437                             }
 438                             if key == concat!("CFG_DISABLE_", $name) {
 439                                 $val = false;
 440                                 continue
 441                             }
 442                         )*
 443                     }
 444                 }
 445             }
 446
 447             check! {
 448                 ("MANAGE_SUBMODULES", self.submodules),
 449                 ("COMPILER_DOCS", self.compiler_docs),
 450                 ("DOCS", self.docs),
 451                 ("LLVM_ASSERTIONS", self.llvm_assertions),
 452                 ("LLVM_RELEASE_DEBUGINFO", self.llvm_release_debuginfo),
 453                 ("OPTIMIZE_LLVM", self.llvm_optimize),
 454                 ("LLVM_VERSION_CHECK", self.llvm_version_check),
 455                 ("LLVM_STATIC_STDCPP", self.llvm_static_stdcpp),
 456                 ("LLVM_LINK_SHARED", self.llvm_link_shared),
 457                 ("LLVM_CLEAN_REBUILD", self.llvm_clean_rebuild),
 458                 ("OPTIMIZE", self.rust_optimize),
 459                 ("DEBUG_ASSERTIONS", self.rust_debug_assertions),
 460                 ("DEBUGINFO", self.rust_debuginfo),
 461                 ("DEBUGINFO_LINES", self.rust_debuginfo_lines),
 462                 ("DEBUGINFO_ONLY_STD", self.rust_debuginfo_only_std),
 463                 ("JEMALLOC", self.use_jemalloc),
 464                 ("DEBUG_JEMALLOC", self.debug_jemalloc),
 465                 ("RPATH", self.rust_rpath),
 466                 ("OPTIMIZE_TESTS", self.rust_optimize_tests),
 467                 ("DEBUGINFO_TESTS", self.rust_debuginfo_tests),
 468                 ("QUIET_TESTS", self.quiet_tests),
 469                 ("LOCAL_REBUILD", self.local_rebuild),
 470                 ("NINJA", self.ninja),
 471                 ("CODEGEN_TESTS", self.codegen_tests),
 472                 ("LOCKED_DEPS", self.locked_deps),
 473                 ("VENDOR", self.vendor),
 474                 ("FULL_BOOTSTRAP", self.full_bootstrap),
 475                 ("EXTENDED", self.extended),
 476                 ("SANITIZERS", self.sanitizers),
 477                 ("PROFILER", self.profiler),
 478                 ("DIST_SRC", self.rust_dist_src),
 479                 ("CARGO_OPENSSL_STATIC", self.openssl_static),
 480             }
 481
 482             match key {
 483                 "CFG_BUILD" if value.len() > 0 => self.build = value.to_string(),
 484                 "CFG_HOST" if value.len() > 0 => {
 485                     self.host.extend(value.split(" ").map(|s| s.to_string()));
 486
 487                 }
 488                 "CFG_TARGET" if value.len() > 0 => {
 489                     self.target.extend(value.split(" ").map(|s| s.to_string()));
 490                 }
 491                 "CFG_MUSL_ROOT" if value.len() > 0 => {
 492                     self.musl_root = Some(parse_configure_path(value));
 493                 }
 494                 "CFG_MUSL_ROOT_X86_64" if value.len() > 0 => {
 495                     let target = "x86_64-unknown-linux-musl".to_string();
 496                     let target = self.target_config.entry(target)
 497                                      .or_insert(Target::default());
 498                     target.musl_root = Some(parse_configure_path(value));
 499                 }
 500                 "CFG_MUSL_ROOT_I686" if value.len() > 0 => {
 501                     let target = "i686-unknown-linux-musl".to_string();
 502                     let target = self.target_config.entry(target)
 503                                      .or_insert(Target::default());
 504                     target.musl_root = Some(parse_configure_path(value));
 505                 }
 506                 "CFG_MUSL_ROOT_ARM" if value.len() > 0 => {
 507                     let target = "arm-unknown-linux-musleabi".to_string();
 508                     let target = self.target_config.entry(target)
 509                                      .or_insert(Target::default());
 510                     target.musl_root = Some(parse_configure_path(value));
 511                 }
 512                 "CFG_MUSL_ROOT_ARMHF" if value.len() > 0 => {
 513                     let target = "arm-unknown-linux-musleabihf".to_string();
 514                     let target = self.target_config.entry(target)
 515                                      .or_insert(Target::default());
 516                     target.musl_root = Some(parse_configure_path(value));
 517                 }
 518                 "CFG_MUSL_ROOT_ARMV7" if value.len() > 0 => {
 519                     let target = "armv7-unknown-linux-musleabihf".to_string();
 520                     let target = self.target_config.entry(target)
 521                                      .or_insert(Target::default());
 522                     target.musl_root = Some(parse_configure_path(value));
 523                 }
 524                 "CFG_DEFAULT_AR" if value.len() > 0 => {
 525                     self.rustc_default_ar = Some(value.to_string());
 526                 }
 527                 "CFG_DEFAULT_LINKER" if value.len() > 0 => {
 528                     self.rustc_default_linker = Some(value.to_string());
 529                 }
 530                 "CFG_GDB" if value.len() > 0 => {
 531                     self.gdb = Some(parse_configure_path(value));
 532                 }
 533                 "CFG_RELEASE_CHANNEL" => {
 534                     self.channel = value.to_string();
 535                 }
 536                 "CFG_PREFIX" => {
 537                     self.prefix = Some(PathBuf::from(value));
 538                 }
 539                 "CFG_SYSCONFDIR" => {
 540                     self.sysconfdir = Some(PathBuf::from(value));
 541                 }
 542                 "CFG_DOCDIR" => {
 543                     self.docdir = Some(PathBuf::from(value));
 544                 }
 545                 "CFG_BINDIR" => {
 546                     self.bindir = Some(PathBuf::from(value));
 547                 }
 548                 "CFG_LIBDIR" => {
 549                     self.libdir = Some(PathBuf::from(value));
 550                 }
 551                 "CFG_LIBDIR_RELATIVE" => {
 552                     self.libdir_relative = Some(PathBuf::from(value));
 553                 }
 554                 "CFG_MANDIR" => {
 555                     self.mandir = Some(PathBuf::from(value));
 556                 }
 557                 "CFG_LLVM_ROOT" if value.len() > 0 => {
 558                     let target = self.target_config.entry(self.build.clone())
 559                                      .or_insert(Target::default());
 560                     let root = parse_configure_path(value);
 561                     target.llvm_config = Some(push_exe_path(root, &["bin", "llvm-config"]));
 562                 }
 563                 "CFG_JEMALLOC_ROOT" if value.len() > 0 => {
 564                     let target = self.target_config.entry(self.build.clone())
 565                                      .or_insert(Target::default());
 566                     target.jemalloc = Some(parse_configure_path(value).join("libjemalloc_pic.a"));
 567                 }
 568                 "CFG_ARM_LINUX_ANDROIDEABI_NDK" if value.len() > 0 => {
 569                     let target = "arm-linux-androideabi".to_string();
 570                     let target = self.target_config.entry(target)
 571                                      .or_insert(Target::default());
 572                     target.ndk = Some(parse_configure_path(value));
 573                 }
 574                 "CFG_ARMV7_LINUX_ANDROIDEABI_NDK" if value.len() > 0 => {
 575                     let target = "armv7-linux-androideabi".to_string();
 576                     let target = self.target_config.entry(target)
 577                                      .or_insert(Target::default());
 578                     target.ndk = Some(parse_configure_path(value));
 579                 }
 580                 "CFG_I686_LINUX_ANDROID_NDK" if value.len() > 0 => {
 581                     let target = "i686-linux-android".to_string();
 582                     let target = self.target_config.entry(target)
 583                                      .or_insert(Target::default());
 584                     target.ndk = Some(parse_configure_path(value));
 585                 }
 586                 "CFG_AARCH64_LINUX_ANDROID_NDK" if value.len() > 0 => {
 587                     let target = "aarch64-linux-android".to_string();
 588                     let target = self.target_config.entry(target)
 589                                      .or_insert(Target::default());
 590                     target.ndk = Some(parse_configure_path(value));
 591                 }
 592                 "CFG_X86_64_LINUX_ANDROID_NDK" if value.len() > 0 => {
 593                     let target = "x86_64-linux-android".to_string();
 594                     let target = self.target_config.entry(target)
 595                                      .or_insert(Target::default());
 596                     target.ndk = Some(parse_configure_path(value));
 597                 }
 598                 "CFG_LOCAL_RUST_ROOT" if value.len() > 0 => {
 599                     let path = parse_configure_path(value);
 600                     self.rustc = Some(push_exe_path(path.clone(), &["bin", "rustc"]));
 601                     self.cargo = Some(push_exe_path(path, &["bin", "cargo"]));
 602                 }
 603                 "CFG_PYTHON" if value.len() > 0 => {
 604                     let path = parse_configure_path(value);
 605                     self.python = Some(path);
 606                 }
 607                 "CFG_ENABLE_CCACHE" if value == "1" => {
 608                     self.ccache = Some(exe("ccache", &self.build));
 609                 }
 610                 "CFG_ENABLE_SCCACHE" if value == "1" => {
 611                     self.ccache = Some(exe("sccache", &self.build));
 612                 }
 613                 "CFG_CONFIGURE_ARGS" if value.len() > 0 => {
 614                     self.configure_args = value.split_whitespace()
 615                                                .map(|s| s.to_string())
 616                                                .collect();
 617                 }
 618                 "CFG_QEMU_ARMHF_ROOTFS" if value.len() > 0 => {
 619                     let target = "arm-unknown-linux-gnueabihf".to_string();
 620                     let target = self.target_config.entry(target)
 621                                      .or_insert(Target::default());
 622                     target.qemu_rootfs = Some(parse_configure_path(value));
 623                 }
 624                 _ => {}
 625             }
 626         }
 627     }
 628
 629     pub fn verbose(&self) -> bool {
 630         self.verbose > 0
 631     }
 632
 633     pub fn very_verbose(&self) -> bool {
 634         self.verbose > 1
 635     }
 636 }
 637
 638 #[cfg(not(windows))]
 639 fn parse_configure_path(path: &str) -> PathBuf {
 640     path.into()
 641 }
 642
 643 #[cfg(windows)]
 644 fn parse_configure_path(path: &str) -> PathBuf {
 645     // on windows, configure produces unix style paths e.g. /c/some/path but we
 646     // only want real windows paths
 647
 648     use std::process::Command;
 649     use build_helper;
 650
 651     // '/' is invalid in windows paths, so we can detect unix paths by the presence of it
 652     if !path.contains('/') {
 653         return path.into();
 654     }
 655
 656     let win_path = build_helper::output(Command::new("cygpath").arg("-w").arg(path));
 657     let win_path = win_path.trim();
 658
 659     win_path.into()
 660 }
 661
 662 fn set<T>(field: &mut T, val: Option<T>) {
 663     if let Some(v) = val {
 664         *field = v;
 665     }
 666 }