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     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 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     // These are either the stage0 downloaded binaries or the locally installed ones.
 118     pub initial_cargo: PathBuf,
 119     pub initial_rustc: PathBuf,
 120
 121 }
 122
 123 /// Per-target configuration stored in the global configuration structure.
 124 #[derive(Default)]
 125 pub struct Target {
 126     /// Some(path to llvm-config) if using an external LLVM.
 127     pub llvm_config: Option<PathBuf>,
 128     pub jemalloc: Option<PathBuf>,
 129     pub cc: Option<PathBuf>,
 130     pub cxx: Option<PathBuf>,
 131     pub ndk: Option<PathBuf>,
 132     pub musl_root: Option<PathBuf>,
 133     pub qemu_rootfs: Option<PathBuf>,
 134 }
 135
 136 /// Structure of the `config.toml` file that configuration is read from.
 137 ///
 138 /// This structure uses `Decodable` to automatically decode a TOML configuration
 139 /// file into this format, and then this is traversed and written into the above
 140 /// `Config` structure.
 141 #[derive(RustcDecodable, Default)]
 142 struct TomlConfig {
 143     build: Option<Build>,
 144     install: Option<Install>,
 145     llvm: Option<Llvm>,
 146     rust: Option<Rust>,
 147     target: Option<HashMap<String, TomlTarget>>,
 148     dist: Option<Dist>,
 149 }
 150
 151 /// TOML representation of various global build decisions.
 152 #[derive(RustcDecodable, Default, Clone)]
 153 struct Build {
 154     build: Option<String>,
 155     host: Vec<String>,
 156     target: Vec<String>,
 157     cargo: Option<String>,
 158     rustc: Option<String>,
 159     low_priority: Option<bool>,
 160     compiler_docs: Option<bool>,
 161     docs: Option<bool>,
 162     submodules: Option<bool>,
 163     gdb: Option<String>,
 164     locked_deps: Option<bool>,
 165     vendor: Option<bool>,
 166     nodejs: Option<String>,
 167     python: Option<String>,
 168     full_bootstrap: Option<bool>,
 169     extended: Option<bool>,
 170     verbose: Option<usize>,
 171     sanitizers: Option<bool>,
 172     profiler: Option<bool>,
 173     openssl_static: Option<bool>,
 174 }
 175
 176 /// TOML representation of various global install decisions.
 177 #[derive(RustcDecodable, Default, Clone)]
 178 struct Install {
 179     prefix: Option<String>,
 180     sysconfdir: Option<String>,
 181     docdir: Option<String>,
 182     bindir: Option<String>,
 183     libdir: Option<String>,
 184     mandir: Option<String>,
 185 }
 186
 187 /// TOML representation of how the LLVM build is configured.
 188 #[derive(RustcDecodable, Default)]
 189 struct Llvm {
 190     ccache: Option<StringOrBool>,
 191     ninja: Option<bool>,
 192     assertions: Option<bool>,
 193     optimize: Option<bool>,
 194     release_debuginfo: Option<bool>,
 195     version_check: Option<bool>,
 196     static_libstdcpp: Option<bool>,
 197     targets: Option<String>,
 198     experimental_targets: Option<String>,
 199     link_jobs: Option<u32>,
 200     clean_rebuild: Option<bool>,
 201 }
 202
 203 #[derive(RustcDecodable, Default, Clone)]
 204 struct Dist {
 205     sign_folder: Option<String>,
 206     gpg_password_file: Option<String>,
 207     upload_addr: Option<String>,
 208     src_tarball: Option<bool>,
 209 }
 210
 211 #[derive(RustcDecodable)]
 212 enum StringOrBool {
 213     String(String),
 214     Bool(bool),
 215 }
 216
 217 impl Default for StringOrBool {
 218     fn default() -> StringOrBool {
 219         StringOrBool::Bool(false)
 220     }
 221 }
 222
 223 /// TOML representation of how the Rust build is configured.
 224 #[derive(RustcDecodable, Default)]
 225 struct Rust {
 226     optimize: Option<bool>,
 227     codegen_units: Option<u32>,
 228     debug_assertions: Option<bool>,
 229     debuginfo: Option<bool>,
 230     debuginfo_lines: Option<bool>,
 231     debuginfo_only_std: Option<bool>,
 232     debug_jemalloc: Option<bool>,
 233     use_jemalloc: Option<bool>,
 234     backtrace: Option<bool>,
 235     default_linker: Option<String>,
 236     default_ar: Option<String>,
 237     channel: Option<String>,
 238     musl_root: Option<String>,
 239     rpath: Option<bool>,
 240     optimize_tests: Option<bool>,
 241     debuginfo_tests: Option<bool>,
 242     codegen_tests: Option<bool>,
 243 }
 244
 245 /// TOML representation of how each build target is configured.
 246 #[derive(RustcDecodable, Default)]
 247 struct TomlTarget {
 248     llvm_config: Option<String>,
 249     jemalloc: Option<String>,
 250     cc: Option<String>,
 251     cxx: Option<String>,
 252     android_ndk: Option<String>,
 253     musl_root: Option<String>,
 254     qemu_rootfs: Option<String>,
 255 }
 256
 257 impl Config {
 258     pub fn parse(build: &str, file: Option<PathBuf>) -> Config {
 259         let mut config = Config::default();
 260         config.llvm_optimize = true;
 261         config.use_jemalloc = true;
 262         config.backtrace = true;
 263         config.rust_optimize = true;
 264         config.rust_optimize_tests = true;
 265         config.submodules = true;
 266         config.docs = true;
 267         config.rust_rpath = true;
 268         config.rust_codegen_units = 1;
 269         config.build = build.to_string();
 270         config.channel = "dev".to_string();
 271         config.codegen_tests = true;
 272         config.rust_dist_src = true;
 273
 274         let toml = file.map(|file| {
 275             let mut f = t!(File::open(&file));
 276             let mut toml = String::new();
 277             t!(f.read_to_string(&mut toml));
 278             let mut p = Parser::new(&toml);
 279             let table = match p.parse() {
 280                 Some(table) => table,
 281                 None => {
 282                     println!("failed to parse TOML configuration '{}':", file.to_str().unwrap());
 283                     for err in p.errors.iter() {
 284                         let (loline, locol) = p.to_linecol(err.lo);
 285                         let (hiline, hicol) = p.to_linecol(err.hi);
 286                         println!("{}:{}-{}:{}: {}", loline, locol, hiline,
 287                                  hicol, err.desc);
 288                     }
 289                     process::exit(2);
 290                 }
 291             };
 292             let mut d = Decoder::new(Value::Table(table));
 293             match Decodable::decode(&mut d) {
 294                 Ok(cfg) => cfg,
 295                 Err(e) => {
 296                     println!("failed to decode TOML: {}", e);
 297                     process::exit(2);
 298                 }
 299             }
 300         }).unwrap_or_else(|| TomlConfig::default());
 301
 302         let build = toml.build.clone().unwrap_or(Build::default());
 303         set(&mut config.build, build.build.clone());
 304         config.host.push(config.build.clone());
 305         for host in build.host.iter() {
 306             if !config.host.contains(host) {
 307                 config.host.push(host.clone());
 308             }
 309         }
 310         for target in config.host.iter().chain(&build.target) {
 311             if !config.target.contains(target) {
 312                 config.target.push(target.clone());
 313             }
 314         }
 315         config.nodejs = build.nodejs.map(PathBuf::from);
 316         config.gdb = build.gdb.map(PathBuf::from);
 317         config.python = build.python.map(PathBuf::from);
 318         set(&mut config.low_priority, build.low_priority);
 319         set(&mut config.compiler_docs, build.compiler_docs);
 320         set(&mut config.docs, build.docs);
 321         set(&mut config.submodules, build.submodules);
 322         set(&mut config.locked_deps, build.locked_deps);
 323         set(&mut config.vendor, build.vendor);
 324         set(&mut config.full_bootstrap, build.full_bootstrap);
 325         set(&mut config.extended, build.extended);
 326         set(&mut config.verbose, build.verbose);
 327         set(&mut config.sanitizers, build.sanitizers);
 328         set(&mut config.profiler, build.profiler);
 329         set(&mut config.openssl_static, build.openssl_static);
 330
 331         if let Some(ref install) = toml.install {
 332             config.prefix = install.prefix.clone().map(PathBuf::from);
 333             config.sysconfdir = install.sysconfdir.clone().map(PathBuf::from);
 334             config.docdir = install.docdir.clone().map(PathBuf::from);
 335             config.bindir = install.bindir.clone().map(PathBuf::from);
 336             config.libdir = install.libdir.clone().map(PathBuf::from);
 337             config.mandir = install.mandir.clone().map(PathBuf::from);
 338         }
 339
 340         if let Some(ref llvm) = toml.llvm {
 341             match llvm.ccache {
 342                 Some(StringOrBool::String(ref s)) => {
 343                     config.ccache = Some(s.to_string())
 344                 }
 345                 Some(StringOrBool::Bool(true)) => {
 346                     config.ccache = Some("ccache".to_string());
 347                 }
 348                 Some(StringOrBool::Bool(false)) | None => {}
 349             }
 350             set(&mut config.ninja, llvm.ninja);
 351             set(&mut config.llvm_assertions, llvm.assertions);
 352             set(&mut config.llvm_optimize, llvm.optimize);
 353             set(&mut config.llvm_release_debuginfo, llvm.release_debuginfo);
 354             set(&mut config.llvm_version_check, llvm.version_check);
 355             set(&mut config.llvm_static_stdcpp, llvm.static_libstdcpp);
 356             set(&mut config.llvm_clean_rebuild, llvm.clean_rebuild);
 357             config.llvm_targets = llvm.targets.clone();
 358             config.llvm_experimental_targets = llvm.experimental_targets.clone();
 359             config.llvm_link_jobs = llvm.link_jobs;
 360         }
 361
 362         if let Some(ref rust) = toml.rust {
 363             set(&mut config.rust_debug_assertions, rust.debug_assertions);
 364             set(&mut config.rust_debuginfo, rust.debuginfo);
 365             set(&mut config.rust_debuginfo_lines, rust.debuginfo_lines);
 366             set(&mut config.rust_debuginfo_only_std, rust.debuginfo_only_std);
 367             set(&mut config.rust_optimize, rust.optimize);
 368             set(&mut config.rust_optimize_tests, rust.optimize_tests);
 369             set(&mut config.rust_debuginfo_tests, rust.debuginfo_tests);
 370             set(&mut config.codegen_tests, rust.codegen_tests);
 371             set(&mut config.rust_rpath, rust.rpath);
 372             set(&mut config.debug_jemalloc, rust.debug_jemalloc);
 373             set(&mut config.use_jemalloc, rust.use_jemalloc);
 374             set(&mut config.backtrace, rust.backtrace);
 375             set(&mut config.channel, rust.channel.clone());
 376             config.rustc_default_linker = rust.default_linker.clone();
 377             config.rustc_default_ar = rust.default_ar.clone();
 378             config.musl_root = rust.musl_root.clone().map(PathBuf::from);
 379
 380             match rust.codegen_units {
 381                 Some(0) => config.rust_codegen_units = num_cpus::get() as u32,
 382                 Some(n) => config.rust_codegen_units = n,
 383                 None => {}
 384             }
 385         }
 386
 387         if let Some(ref t) = toml.target {
 388             for (triple, cfg) in t {
 389                 let mut target = Target::default();
 390
 391                 if let Some(ref s) = cfg.llvm_config {
 392                     target.llvm_config = Some(env::current_dir().unwrap().join(s));
 393                 }
 394                 if let Some(ref s) = cfg.jemalloc {
 395                     target.jemalloc = Some(env::current_dir().unwrap().join(s));
 396                 }
 397                 if let Some(ref s) = cfg.android_ndk {
 398                     target.ndk = Some(env::current_dir().unwrap().join(s));
 399                 }
 400                 target.cxx = cfg.cxx.clone().map(PathBuf::from);
 401                 target.cc = cfg.cc.clone().map(PathBuf::from);
 402                 target.musl_root = cfg.musl_root.clone().map(PathBuf::from);
 403                 target.qemu_rootfs = cfg.qemu_rootfs.clone().map(PathBuf::from);
 404
 405                 config.target_config.insert(triple.clone(), target);
 406             }
 407         }
 408
 409         if let Some(ref t) = toml.dist {
 410             config.dist_sign_folder = t.sign_folder.clone().map(PathBuf::from);
 411             config.dist_gpg_password_file = t.gpg_password_file.clone().map(PathBuf::from);
 412             config.dist_upload_addr = t.upload_addr.clone();
 413             set(&mut config.rust_dist_src, t.src_tarball);
 414         }
 415
 416         let cwd = t!(env::current_dir());
 417         let out = cwd.join("build");
 418
 419         let stage0_root = out.join(&config.build).join("stage0/bin");
 420         config.initial_rustc = match build.rustc {
 421             Some(s) => PathBuf::from(s),
 422             None => stage0_root.join(exe("rustc", &config.build)),
 423         };
 424         config.initial_cargo = match build.cargo {
 425             Some(s) => PathBuf::from(s),
 426             None => stage0_root.join(exe("cargo", &config.build)),
 427         };
 428
 429         // compat with `./configure` while we're still using that
 430         if fs::metadata("config.mk").is_ok() {
 431             config.update_with_config_mk();
 432         }
 433
 434         config
 435     }
 436
 437     /// "Temporary" routine to parse `config.mk` into this configuration.
 438     ///
 439     /// While we still have `./configure` this implements the ability to decode
 440     /// that configuration into this. This isn't exactly a full-blown makefile
 441     /// parser, but hey it gets the job done!
 442     fn update_with_config_mk(&mut self) {
 443         let mut config = String::new();
 444         File::open("config.mk").unwrap().read_to_string(&mut config).unwrap();
 445         for line in config.lines() {
 446             let mut parts = line.splitn(2, ":=").map(|s| s.trim());
 447             let key = parts.next().unwrap();
 448             let value = match parts.next() {
 449                 Some(n) if n.starts_with('\"') => &n[1..n.len() - 1],
 450                 Some(n) => n,
 451                 None => continue
 452             };
 453
 454             macro_rules! check {
 455                 ($(($name:expr, $val:expr),)*) => {
 456                     if value == "1" {
 457                         $(
 458                             if key == concat!("CFG_ENABLE_", $name) {
 459                                 $val = true;
 460                                 continue
 461                             }
 462                             if key == concat!("CFG_DISABLE_", $name) {
 463                                 $val = false;
 464                                 continue
 465                             }
 466                         )*
 467                     }
 468                 }
 469             }
 470
 471             check! {
 472                 ("MANAGE_SUBMODULES", self.submodules),
 473                 ("COMPILER_DOCS", self.compiler_docs),
 474                 ("DOCS", self.docs),
 475                 ("LLVM_ASSERTIONS", self.llvm_assertions),
 476                 ("LLVM_RELEASE_DEBUGINFO", self.llvm_release_debuginfo),
 477                 ("OPTIMIZE_LLVM", self.llvm_optimize),
 478                 ("LLVM_VERSION_CHECK", self.llvm_version_check),
 479                 ("LLVM_STATIC_STDCPP", self.llvm_static_stdcpp),
 480                 ("LLVM_LINK_SHARED", self.llvm_link_shared),
 481                 ("LLVM_CLEAN_REBUILD", self.llvm_clean_rebuild),
 482                 ("OPTIMIZE", self.rust_optimize),
 483                 ("DEBUG_ASSERTIONS", self.rust_debug_assertions),
 484                 ("DEBUGINFO", self.rust_debuginfo),
 485                 ("DEBUGINFO_LINES", self.rust_debuginfo_lines),
 486                 ("DEBUGINFO_ONLY_STD", self.rust_debuginfo_only_std),
 487                 ("JEMALLOC", self.use_jemalloc),
 488                 ("DEBUG_JEMALLOC", self.debug_jemalloc),
 489                 ("RPATH", self.rust_rpath),
 490                 ("OPTIMIZE_TESTS", self.rust_optimize_tests),
 491                 ("DEBUGINFO_TESTS", self.rust_debuginfo_tests),
 492                 ("QUIET_TESTS", self.quiet_tests),
 493                 ("LOCAL_REBUILD", self.local_rebuild),
 494                 ("NINJA", self.ninja),
 495                 ("CODEGEN_TESTS", self.codegen_tests),
 496                 ("LOCKED_DEPS", self.locked_deps),
 497                 ("VENDOR", self.vendor),
 498                 ("FULL_BOOTSTRAP", self.full_bootstrap),
 499                 ("EXTENDED", self.extended),
 500                 ("SANITIZERS", self.sanitizers),
 501                 ("PROFILER", self.profiler),
 502                 ("DIST_SRC", self.rust_dist_src),
 503                 ("CARGO_OPENSSL_STATIC", self.openssl_static),
 504             }
 505
 506             match key {
 507                 "CFG_BUILD" if value.len() > 0 => self.build = value.to_string(),
 508                 "CFG_HOST" if value.len() > 0 => {
 509                     self.host.extend(value.split(" ").map(|s| s.to_string()));
 510
 511                 }
 512                 "CFG_TARGET" if value.len() > 0 => {
 513                     self.target.extend(value.split(" ").map(|s| s.to_string()));
 514                 }
 515                 "CFG_EXPERIMENTAL_TARGETS" if value.len() > 0 => {
 516                     self.llvm_experimental_targets = Some(value.to_string());
 517                 }
 518                 "CFG_MUSL_ROOT" if value.len() > 0 => {
 519                     self.musl_root = Some(parse_configure_path(value));
 520                 }
 521                 "CFG_MUSL_ROOT_X86_64" if value.len() > 0 => {
 522                     let target = "x86_64-unknown-linux-musl".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_MUSL_ROOT_I686" if value.len() > 0 => {
 528                     let target = "i686-unknown-linux-musl".to_string();
 529                     let target = self.target_config.entry(target)
 530                                      .or_insert(Target::default());
 531                     target.musl_root = Some(parse_configure_path(value));
 532                 }
 533                 "CFG_MUSL_ROOT_ARM" if value.len() > 0 => {
 534                     let target = "arm-unknown-linux-musleabi".to_string();
 535                     let target = self.target_config.entry(target)
 536                                      .or_insert(Target::default());
 537                     target.musl_root = Some(parse_configure_path(value));
 538                 }
 539                 "CFG_MUSL_ROOT_ARMHF" if value.len() > 0 => {
 540                     let target = "arm-unknown-linux-musleabihf".to_string();
 541                     let target = self.target_config.entry(target)
 542                                      .or_insert(Target::default());
 543                     target.musl_root = Some(parse_configure_path(value));
 544                 }
 545                 "CFG_MUSL_ROOT_ARMV7" if value.len() > 0 => {
 546                     let target = "armv7-unknown-linux-musleabihf".to_string();
 547                     let target = self.target_config.entry(target)
 548                                      .or_insert(Target::default());
 549                     target.musl_root = Some(parse_configure_path(value));
 550                 }
 551                 "CFG_DEFAULT_AR" if value.len() > 0 => {
 552                     self.rustc_default_ar = Some(value.to_string());
 553                 }
 554                 "CFG_DEFAULT_LINKER" if value.len() > 0 => {
 555                     self.rustc_default_linker = Some(value.to_string());
 556                 }
 557                 "CFG_GDB" if value.len() > 0 => {
 558                     self.gdb = Some(parse_configure_path(value));
 559                 }
 560                 "CFG_RELEASE_CHANNEL" => {
 561                     self.channel = value.to_string();
 562                 }
 563                 "CFG_PREFIX" => {
 564                     self.prefix = Some(PathBuf::from(value));
 565                 }
 566                 "CFG_SYSCONFDIR" => {
 567                     self.sysconfdir = Some(PathBuf::from(value));
 568                 }
 569                 "CFG_DOCDIR" => {
 570                     self.docdir = Some(PathBuf::from(value));
 571                 }
 572                 "CFG_BINDIR" => {
 573                     self.bindir = Some(PathBuf::from(value));
 574                 }
 575                 "CFG_LIBDIR" => {
 576                     self.libdir = Some(PathBuf::from(value));
 577                 }
 578                 "CFG_LIBDIR_RELATIVE" => {
 579                     self.libdir_relative = Some(PathBuf::from(value));
 580                 }
 581                 "CFG_MANDIR" => {
 582                     self.mandir = Some(PathBuf::from(value));
 583                 }
 584                 "CFG_LLVM_ROOT" if value.len() > 0 => {
 585                     let target = self.target_config.entry(self.build.clone())
 586                                      .or_insert(Target::default());
 587                     let root = parse_configure_path(value);
 588                     target.llvm_config = Some(push_exe_path(root, &["bin", "llvm-config"]));
 589                 }
 590                 "CFG_JEMALLOC_ROOT" if value.len() > 0 => {
 591                     let target = self.target_config.entry(self.build.clone())
 592                                      .or_insert(Target::default());
 593                     target.jemalloc = Some(parse_configure_path(value).join("libjemalloc_pic.a"));
 594                 }
 595                 "CFG_ARM_LINUX_ANDROIDEABI_NDK" if value.len() > 0 => {
 596                     let target = "arm-linux-androideabi".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_ARMV7_LINUX_ANDROIDEABI_NDK" if value.len() > 0 => {
 602                     let target = "armv7-linux-androideabi".to_string();
 603                     let target = self.target_config.entry(target)
 604                                      .or_insert(Target::default());
 605                     target.ndk = Some(parse_configure_path(value));
 606                 }
 607                 "CFG_I686_LINUX_ANDROID_NDK" if value.len() > 0 => {
 608                     let target = "i686-linux-android".to_string();
 609                     let target = self.target_config.entry(target)
 610                                      .or_insert(Target::default());
 611                     target.ndk = Some(parse_configure_path(value));
 612                 }
 613                 "CFG_AARCH64_LINUX_ANDROID_NDK" if value.len() > 0 => {
 614                     let target = "aarch64-linux-android".to_string();
 615                     let target = self.target_config.entry(target)
 616                                      .or_insert(Target::default());
 617                     target.ndk = Some(parse_configure_path(value));
 618                 }
 619                 "CFG_X86_64_LINUX_ANDROID_NDK" if value.len() > 0 => {
 620                     let target = "x86_64-linux-android".to_string();
 621                     let target = self.target_config.entry(target)
 622                                      .or_insert(Target::default());
 623                     target.ndk = Some(parse_configure_path(value));
 624                 }
 625                 "CFG_LOCAL_RUST_ROOT" if value.len() > 0 => {
 626                     let path = parse_configure_path(value);
 627                     self.initial_rustc = push_exe_path(path.clone(), &["bin", "rustc"]);
 628                     self.initial_cargo = push_exe_path(path, &["bin", "cargo"]);
 629                 }
 630                 "CFG_PYTHON" if value.len() > 0 => {
 631                     let path = parse_configure_path(value);
 632                     self.python = Some(path);
 633                 }
 634                 "CFG_ENABLE_CCACHE" if value == "1" => {
 635                     self.ccache = Some(exe("ccache", &self.build));
 636                 }
 637                 "CFG_ENABLE_SCCACHE" if value == "1" => {
 638                     self.ccache = Some(exe("sccache", &self.build));
 639                 }
 640                 "CFG_CONFIGURE_ARGS" if value.len() > 0 => {
 641                     self.configure_args = value.split_whitespace()
 642                                                .map(|s| s.to_string())
 643                                                .collect();
 644                 }
 645                 "CFG_QEMU_ARMHF_ROOTFS" if value.len() > 0 => {
 646                     let target = "arm-unknown-linux-gnueabihf".to_string();
 647                     let target = self.target_config.entry(target)
 648                                      .or_insert(Target::default());
 649                     target.qemu_rootfs = Some(parse_configure_path(value));
 650                 }
 651                 _ => {}
 652             }
 653         }
 654     }
 655
 656     pub fn verbose(&self) -> bool {
 657         self.verbose > 0
 658     }
 659
 660     pub fn very_verbose(&self) -> bool {
 661         self.verbose > 1
 662     }
 663 }
 664
 665 #[cfg(not(windows))]
 666 fn parse_configure_path(path: &str) -> PathBuf {
 667     path.into()
 668 }
 669
 670 #[cfg(windows)]
 671 fn parse_configure_path(path: &str) -> PathBuf {
 672     // on windows, configure produces unix style paths e.g. /c/some/path but we
 673     // only want real windows paths
 674
 675     use std::process::Command;
 676     use build_helper;
 677
 678     // '/' is invalid in windows paths, so we can detect unix paths by the presence of it
 679     if !path.contains('/') {
 680         return path.into();
 681     }
 682
 683     let win_path = build_helper::output(Command::new("cygpath").arg("-w").arg(path));
 684     let win_path = win_path.trim();
 685
 686     win_path.into()
 687 }
 688
 689 fn set<T>(field: &mut T, val: Option<T>) {
 690     if let Some(v) = val {
 691         *field = v;
 692     }
 693 }