src/bootstrap/native.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 //! Compilation of native dependencies like LLVM.
  12 //!
  13 //! Native projects like LLVM unfortunately aren't suited just yet for
  14 //! compilation in build scripts that Cargo has. This is because the
  15 //! compilation takes a *very* long time but also because we don't want to
  16 //! compile LLVM 3 times as part of a normal bootstrap (we want it cached).
  17 //!
  18 //! LLVM and compiler-rt are essentially just wired up to everything else to
  19 //! ensure that they're always in place if needed.
  20
  21 use std::env;
  22 use std::ffi::OsString;
  23 use std::fs::{self, File};
  24 use std::io::{Read, Write};
  25 use std::path::{Path, PathBuf};
  26 use std::process::Command;
  27
  28 use build_helper::output;
  29 use cmake;
  30 use cc;
  31
  32 use util::{self, exe};
  33 use build_helper::up_to_date;
  34 use builder::{Builder, RunConfig, ShouldRun, Step};
  35 use cache::Interned;
  36
  37 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
  38 pub struct Llvm {
  39     pub target: Interned<String>,
  40     pub emscripten: bool,
  41 }
  42
  43 impl Step for Llvm {
  44     type Output = PathBuf; // path to llvm-config
  45
  46     const ONLY_HOSTS: bool = true;
  47
  48     fn should_run(run: ShouldRun) -> ShouldRun {
  49         run.path("src/llvm").path("src/llvm-emscripten")
  50     }
  51
  52     fn make_run(run: RunConfig) {
  53         let emscripten = run.path.ends_with("llvm-emscripten");
  54         run.builder.ensure(Llvm {
  55             target: run.target,
  56             emscripten,
  57         });
  58     }
  59
  60     /// Compile LLVM for `target`.
  61     fn run(self, builder: &Builder) -> PathBuf {
  62         let target = self.target;
  63         let emscripten = self.emscripten;
  64
  65         // If we're using a custom LLVM bail out here, but we can only use a
  66         // custom LLVM for the build triple.
  67         if !self.emscripten {
  68             if let Some(config) = builder.config.target_config.get(&target) {
  69                 if let Some(ref s) = config.llvm_config {
  70                     check_llvm_version(builder, s);
  71                     return s.to_path_buf()
  72                 }
  73             }
  74         }
  75
  76         let rebuild_trigger = builder.src.join("src/rustllvm/llvm-rebuild-trigger");
  77         let mut rebuild_trigger_contents = String::new();
  78         t!(t!(File::open(&rebuild_trigger)).read_to_string(&mut rebuild_trigger_contents));
  79
  80         let (out_dir, llvm_config_ret_dir) = if emscripten {
  81             let dir = builder.emscripten_llvm_out(target);
  82             let config_dir = dir.join("bin");
  83             (dir, config_dir)
  84         } else {
  85             let mut dir = builder.llvm_out(builder.config.build);
  86             if !builder.config.build.contains("msvc") || builder.config.ninja {
  87                 dir.push("build");
  88             }
  89             (builder.llvm_out(target), dir.join("bin"))
  90         };
  91         let done_stamp = out_dir.join("llvm-finished-building");
  92         let build_llvm_config = llvm_config_ret_dir
  93             .join(exe("llvm-config", &*builder.config.build));
  94         if done_stamp.exists() {
  95             let mut done_contents = String::new();
  96             t!(t!(File::open(&done_stamp)).read_to_string(&mut done_contents));
  97
  98             // If LLVM was already built previously and contents of the rebuild-trigger file
  99             // didn't change from the previous build, then no action is required.
 100             if done_contents == rebuild_trigger_contents {
 101                 return build_llvm_config
 102             }
 103         }
 104
 105         let _folder = builder.fold_output(|| "llvm");
 106         let descriptor = if emscripten { "Emscripten " } else { "" };
 107         builder.info(&format!("Building {}LLVM for {}", descriptor, target));
 108         let _time = util::timeit(&builder);
 109         t!(fs::create_dir_all(&out_dir));
 110
 111         // http://llvm.org/docs/CMake.html
 112         let root = if self.emscripten { "src/llvm-emscripten" } else { "src/llvm" };
 113         let mut cfg = cmake::Config::new(builder.src.join(root));
 114
 115         let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
 116             (false, _) => "Debug",
 117             (true, false) => "Release",
 118             (true, true) => "RelWithDebInfo",
 119         };
 120
 121         // NOTE: remember to also update `config.toml.example` when changing the
 122         // defaults!
 123         let llvm_targets = if self.emscripten {
 124             "JSBackend"
 125         } else {
 126             match builder.config.llvm_targets {
 127                 Some(ref s) => s,
 128                 None => "X86;ARM;AArch64;Mips;PowerPC;SystemZ;MSP430;Sparc;NVPTX;Hexagon",
 129             }
 130         };
 131
 132         let llvm_exp_targets = if self.emscripten {
 133             ""
 134         } else {
 135             &builder.config.llvm_experimental_targets[..]
 136         };
 137
 138         let assertions = if builder.config.llvm_assertions {"ON"} else {"OFF"};
 139
 140         cfg.out_dir(&out_dir)
 141            .profile(profile)
 142            .define("LLVM_ENABLE_ASSERTIONS", assertions)
 143            .define("LLVM_TARGETS_TO_BUILD", llvm_targets)
 144            .define("LLVM_EXPERIMENTAL_TARGETS_TO_BUILD", llvm_exp_targets)
 145            .define("LLVM_INCLUDE_EXAMPLES", "OFF")
 146            .define("LLVM_INCLUDE_TESTS", "OFF")
 147            .define("LLVM_INCLUDE_DOCS", "OFF")
 148            .define("LLVM_INCLUDE_BENCHMARKS", "OFF")
 149            .define("LLVM_ENABLE_ZLIB", "OFF")
 150            .define("WITH_POLLY", "OFF")
 151            .define("LLVM_ENABLE_TERMINFO", "OFF")
 152            .define("LLVM_ENABLE_LIBEDIT", "OFF")
 153            .define("LLVM_PARALLEL_COMPILE_JOBS", builder.jobs().to_string())
 154            .define("LLVM_TARGET_ARCH", target.split('-').next().unwrap())
 155            .define("LLVM_DEFAULT_TARGET_TRIPLE", target);
 156
 157         if builder.config.llvm_thin_lto && !emscripten {
 158             cfg.define("LLVM_ENABLE_LTO", "Thin")
 159                .define("LLVM_ENABLE_LLD", "ON");
 160         }
 161
 162         // By default, LLVM will automatically find OCaml and, if it finds it,
 163         // install the LLVM bindings in LLVM_OCAML_INSTALL_PATH, which defaults
 164         // to /usr/bin/ocaml.
 165         // This causes problem for non-root builds of Rust. Side-step the issue
 166         // by setting LLVM_OCAML_INSTALL_PATH to a relative path, so it installs
 167         // in the prefix.
 168         cfg.define("LLVM_OCAML_INSTALL_PATH",
 169             env::var_os("LLVM_OCAML_INSTALL_PATH").unwrap_or_else(|| "usr/lib/ocaml".into()));
 170
 171         let want_lldb = builder.config.lldb_enabled && !self.emscripten;
 172
 173         // This setting makes the LLVM tools link to the dynamic LLVM library,
 174         // which saves both memory during parallel links and overall disk space
 175         // for the tools. We don't do this on every platform as it doesn't work
 176         // equally well everywhere.
 177         if builder.llvm_link_tools_dynamically(target) && !emscripten {
 178             cfg.define("LLVM_LINK_LLVM_DYLIB", "ON");
 179         }
 180
 181         // For distribution we want the LLVM tools to be *statically* linked to libstdc++
 182         if builder.config.llvm_tools_enabled || want_lldb {
 183             if !target.contains("windows") {
 184                 if target.contains("apple") {
 185                     cfg.define("CMAKE_EXE_LINKER_FLAGS", "-static-libstdc++");
 186                 } else {
 187                     cfg.define("CMAKE_EXE_LINKER_FLAGS", "-Wl,-Bsymbolic -static-libstdc++");
 188                 }
 189             }
 190         }
 191
 192         if target.contains("msvc") {
 193             cfg.define("LLVM_USE_CRT_DEBUG", "MT");
 194             cfg.define("LLVM_USE_CRT_RELEASE", "MT");
 195             cfg.define("LLVM_USE_CRT_RELWITHDEBINFO", "MT");
 196             cfg.static_crt(true);
 197         }
 198
 199         if target.starts_with("i686") {
 200             cfg.define("LLVM_BUILD_32_BITS", "ON");
 201         }
 202
 203         if want_lldb {
 204             cfg.define("LLVM_EXTERNAL_CLANG_SOURCE_DIR", builder.src.join("src/tools/clang"));
 205             cfg.define("LLVM_EXTERNAL_LLDB_SOURCE_DIR", builder.src.join("src/tools/lldb"));
 206             // For the time being, disable code signing.
 207             cfg.define("LLDB_CODESIGN_IDENTITY", "");
 208         } else {
 209             // LLDB requires libxml2; but otherwise we want it to be disabled.
 210             // See https://github.com/rust-lang/rust/pull/50104
 211             cfg.define("LLVM_ENABLE_LIBXML2", "OFF");
 212         }
 213
 214         if let Some(num_linkers) = builder.config.llvm_link_jobs {
 215             if num_linkers > 0 {
 216                 cfg.define("LLVM_PARALLEL_LINK_JOBS", num_linkers.to_string());
 217             }
 218         }
 219
 220         // http://llvm.org/docs/HowToCrossCompileLLVM.html
 221         if target != builder.config.build && !emscripten {
 222             builder.ensure(Llvm {
 223                 target: builder.config.build,
 224                 emscripten: false,
 225             });
 226             // FIXME: if the llvm root for the build triple is overridden then we
 227             //        should use llvm-tblgen from there, also should verify that it
 228             //        actually exists most of the time in normal installs of LLVM.
 229             let host = builder.llvm_out(builder.config.build).join("bin/llvm-tblgen");
 230             cfg.define("CMAKE_CROSSCOMPILING", "True")
 231                .define("LLVM_TABLEGEN", &host);
 232
 233             if target.contains("netbsd") {
 234                cfg.define("CMAKE_SYSTEM_NAME", "NetBSD");
 235             } else if target.contains("freebsd") {
 236                cfg.define("CMAKE_SYSTEM_NAME", "FreeBSD");
 237             }
 238
 239             cfg.define("LLVM_NATIVE_BUILD", builder.llvm_out(builder.config.build).join("build"));
 240         }
 241
 242         configure_cmake(builder, target, &mut cfg, false);
 243
 244         // FIXME: we don't actually need to build all LLVM tools and all LLVM
 245         //        libraries here, e.g. we just want a few components and a few
 246         //        tools. Figure out how to filter them down and only build the right
 247         //        tools and libs on all platforms.
 248
 249         if builder.config.dry_run {
 250             return build_llvm_config;
 251         }
 252
 253         cfg.build();
 254
 255         t!(t!(File::create(&done_stamp)).write_all(rebuild_trigger_contents.as_bytes()));
 256
 257         build_llvm_config
 258     }
 259 }
 260
 261 fn check_llvm_version(builder: &Builder, llvm_config: &Path) {
 262     if !builder.config.llvm_version_check {
 263         return
 264     }
 265
 266     if builder.config.dry_run {
 267         return;
 268     }
 269
 270     let mut cmd = Command::new(llvm_config);
 271     let version = output(cmd.arg("--version"));
 272     let mut parts = version.split('.').take(2)
 273         .filter_map(|s| s.parse::<u32>().ok());
 274     if let (Some(major), Some(_minor)) = (parts.next(), parts.next()) {
 275         if major >= 5 {
 276             return
 277         }
 278     }
 279     panic!("\n\nbad LLVM version: {}, need >=5.0\n\n", version)
 280 }
 281
 282 fn configure_cmake(builder: &Builder,
 283                    target: Interned<String>,
 284                    cfg: &mut cmake::Config,
 285                    building_dist_binaries: bool) {
 286     if builder.config.ninja {
 287         cfg.generator("Ninja");
 288     }
 289     cfg.target(&target)
 290        .host(&builder.config.build);
 291
 292     let sanitize_cc = |cc: &Path| {
 293         if target.contains("msvc") {
 294             OsString::from(cc.to_str().unwrap().replace("\\", "/"))
 295         } else {
 296             cc.as_os_str().to_owned()
 297         }
 298     };
 299
 300     // MSVC with CMake uses msbuild by default which doesn't respect these
 301     // vars that we'd otherwise configure. In that case we just skip this
 302     // entirely.
 303     if target.contains("msvc") && !builder.config.ninja {
 304         return
 305     }
 306
 307     let (cc, cxx) = match builder.config.llvm_clang_cl {
 308         Some(ref cl) => (cl.as_ref(), cl.as_ref()),
 309         None => (builder.cc(target), builder.cxx(target).unwrap()),
 310     };
 311
 312     // Handle msvc + ninja + ccache specially (this is what the bots use)
 313     if target.contains("msvc") &&
 314        builder.config.ninja &&
 315        builder.config.ccache.is_some()
 316     {
 317        let mut wrap_cc = env::current_exe().expect("failed to get cwd");
 318        wrap_cc.set_file_name("sccache-plus-cl.exe");
 319
 320        cfg.define("CMAKE_C_COMPILER", sanitize_cc(&wrap_cc))
 321           .define("CMAKE_CXX_COMPILER", sanitize_cc(&wrap_cc));
 322        cfg.env("SCCACHE_PATH",
 323                builder.config.ccache.as_ref().unwrap())
 324           .env("SCCACHE_TARGET", target)
 325           .env("SCCACHE_CC", &cc)
 326           .env("SCCACHE_CXX", &cxx);
 327
 328        // Building LLVM on MSVC can be a little ludicrous at times. We're so far
 329        // off the beaten path here that I'm not really sure this is even half
 330        // supported any more. Here we're trying to:
 331        //
 332        // * Build LLVM on MSVC
 333        // * Build LLVM with `clang-cl` instead of `cl.exe`
 334        // * Build a project with `sccache`
 335        // * Build for 32-bit as well
 336        // * Build with Ninja
 337        //
 338        // For `cl.exe` there are different binaries to compile 32/64 bit which
 339        // we use but for `clang-cl` there's only one which internally
 340        // multiplexes via flags. As a result it appears that CMake's detection
 341        // of a compiler's architecture and such on MSVC **doesn't** pass any
 342        // custom flags we pass in CMAKE_CXX_FLAGS below. This means that if we
 343        // use `clang-cl.exe` it's always diagnosed as a 64-bit compiler which
 344        // definitely causes problems since all the env vars are pointing to
 345        // 32-bit libraries.
 346        //
 347        // To hack aroudn this... again... we pass an argument that's
 348        // unconditionally passed in the sccache shim. This'll get CMake to
 349        // correctly diagnose it's doing a 32-bit compilation and LLVM will
 350        // internally configure itself appropriately.
 351        if builder.config.llvm_clang_cl.is_some() && target.contains("i686") {
 352            cfg.env("SCCACHE_EXTRA_ARGS", "-m32");
 353        }
 354
 355     // If ccache is configured we inform the build a little differently hwo
 356     // to invoke ccache while also invoking our compilers.
 357     } else if let Some(ref ccache) = builder.config.ccache {
 358        cfg.define("CMAKE_C_COMPILER", ccache)
 359           .define("CMAKE_C_COMPILER_ARG1", sanitize_cc(cc))
 360           .define("CMAKE_CXX_COMPILER", ccache)
 361           .define("CMAKE_CXX_COMPILER_ARG1", sanitize_cc(cxx));
 362     } else {
 363        cfg.define("CMAKE_C_COMPILER", sanitize_cc(cc))
 364           .define("CMAKE_CXX_COMPILER", sanitize_cc(cxx));
 365     }
 366
 367     cfg.build_arg("-j").build_arg(builder.jobs().to_string());
 368     cfg.define("CMAKE_C_FLAGS", builder.cflags(target).join(" "));
 369     let mut cxxflags = builder.cflags(target).join(" ");
 370     if building_dist_binaries {
 371         if builder.config.llvm_static_stdcpp && !target.contains("windows") {
 372             cxxflags.push_str(" -static-libstdc++");
 373         }
 374     }
 375     cfg.define("CMAKE_CXX_FLAGS", cxxflags);
 376     if let Some(ar) = builder.ar(target) {
 377         if ar.is_absolute() {
 378             // LLVM build breaks if `CMAKE_AR` is a relative path, for some reason it
 379             // tries to resolve this path in the LLVM build directory.
 380             cfg.define("CMAKE_AR", sanitize_cc(ar));
 381         }
 382     }
 383
 384     if let Some(ranlib) = builder.ranlib(target) {
 385         if ranlib.is_absolute() {
 386             // LLVM build breaks if `CMAKE_RANLIB` is a relative path, for some reason it
 387             // tries to resolve this path in the LLVM build directory.
 388             cfg.define("CMAKE_RANLIB", sanitize_cc(ranlib));
 389         }
 390     }
 391
 392     if env::var_os("SCCACHE_ERROR_LOG").is_some() {
 393         cfg.env("RUST_LOG", "sccache=warn");
 394     }
 395 }
 396
 397 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 398 pub struct Lld {
 399     pub target: Interned<String>,
 400 }
 401
 402 impl Step for Lld {
 403     type Output = PathBuf;
 404     const ONLY_HOSTS: bool = true;
 405
 406     fn should_run(run: ShouldRun) -> ShouldRun {
 407         run.path("src/tools/lld")
 408     }
 409
 410     fn make_run(run: RunConfig) {
 411         run.builder.ensure(Lld { target: run.target });
 412     }
 413
 414     /// Compile LLVM for `target`.
 415     fn run(self, builder: &Builder) -> PathBuf {
 416         if builder.config.dry_run {
 417             return PathBuf::from("lld-out-dir-test-gen");
 418         }
 419         let target = self.target;
 420
 421         let llvm_config = builder.ensure(Llvm {
 422             target: self.target,
 423             emscripten: false,
 424         });
 425
 426         let out_dir = builder.lld_out(target);
 427         let done_stamp = out_dir.join("lld-finished-building");
 428         if done_stamp.exists() {
 429             return out_dir
 430         }
 431
 432         let _folder = builder.fold_output(|| "lld");
 433         builder.info(&format!("Building LLD for {}", target));
 434         let _time = util::timeit(&builder);
 435         t!(fs::create_dir_all(&out_dir));
 436
 437         let mut cfg = cmake::Config::new(builder.src.join("src/tools/lld"));
 438         configure_cmake(builder, target, &mut cfg, true);
 439
 440         // This is an awful, awful hack. Discovered when we migrated to using
 441         // clang-cl to compile LLVM/LLD it turns out that LLD, when built out of
 442         // tree, will execute `llvm-config --cmakedir` and then tell CMake about
 443         // that directory for later processing. Unfortunately if this path has
 444         // forward slashes in it (which it basically always does on Windows)
 445         // then CMake will hit a syntax error later on as... something isn't
 446         // escaped it seems?
 447         //
 448         // Instead of attempting to fix this problem in upstream CMake and/or
 449         // LLVM/LLD we just hack around it here. This thin wrapper will take the
 450         // output from llvm-config and replace all instances of `\` with `/` to
 451         // ensure we don't hit the same bugs with escaping. It means that you
 452         // can't build on a system where your paths require `\` on Windows, but
 453         // there's probably a lot of reasons you can't do that other than this.
 454         let llvm_config_shim = env::current_exe()
 455             .unwrap()
 456             .with_file_name("llvm-config-wrapper");
 457         cfg.out_dir(&out_dir)
 458            .profile("Release")
 459            .env("LLVM_CONFIG_REAL", llvm_config)
 460            .define("LLVM_CONFIG_PATH", llvm_config_shim)
 461            .define("LLVM_INCLUDE_TESTS", "OFF");
 462
 463         cfg.build();
 464
 465         t!(File::create(&done_stamp));
 466         out_dir
 467     }
 468 }
 469
 470 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 471 pub struct TestHelpers {
 472     pub target: Interned<String>,
 473 }
 474
 475 impl Step for TestHelpers {
 476     type Output = ();
 477
 478     fn should_run(run: ShouldRun) -> ShouldRun {
 479         run.path("src/test/auxiliary/rust_test_helpers.c")
 480     }
 481
 482     fn make_run(run: RunConfig) {
 483         run.builder.ensure(TestHelpers { target: run.target })
 484     }
 485
 486     /// Compiles the `rust_test_helpers.c` library which we used in various
 487     /// `run-pass` test suites for ABI testing.
 488     fn run(self, builder: &Builder) {
 489         if builder.config.dry_run {
 490             return;
 491         }
 492         let target = self.target;
 493         let dst = builder.test_helpers_out(target);
 494         let src = builder.src.join("src/test/auxiliary/rust_test_helpers.c");
 495         if up_to_date(&src, &dst.join("librust_test_helpers.a")) {
 496             return
 497         }
 498
 499         let _folder = builder.fold_output(|| "build_test_helpers");
 500         builder.info("Building test helpers");
 501         t!(fs::create_dir_all(&dst));
 502         let mut cfg = cc::Build::new();
 503
 504         // We may have found various cross-compilers a little differently due to our
 505         // extra configuration, so inform gcc of these compilers. Note, though, that
 506         // on MSVC we still need gcc's detection of env vars (ugh).
 507         if !target.contains("msvc") {
 508             if let Some(ar) = builder.ar(target) {
 509                 cfg.archiver(ar);
 510             }
 511             cfg.compiler(builder.cc(target));
 512         }
 513
 514         cfg.cargo_metadata(false)
 515            .out_dir(&dst)
 516            .target(&target)
 517            .host(&builder.config.build)
 518            .opt_level(0)
 519            .warnings(false)
 520            .debug(false)
 521            .file(builder.src.join("src/test/auxiliary/rust_test_helpers.c"))
 522            .compile("rust_test_helpers");
 523     }
 524 }
 525
 526 const OPENSSL_VERS: &'static str = "1.0.2n";
 527 const OPENSSL_SHA256: &'static str =
 528     "370babb75f278c39e0c50e8c4e7493bc0f18db6867478341a832a982fd15a8fe";
 529
 530 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 531 pub struct Openssl {
 532     pub target: Interned<String>,
 533 }
 534
 535 impl Step for Openssl {
 536     type Output = ();
 537
 538     fn should_run(run: ShouldRun) -> ShouldRun {
 539         run.never()
 540     }
 541
 542     fn run(self, builder: &Builder) {
 543         if builder.config.dry_run {
 544             return;
 545         }
 546         let target = self.target;
 547         let out = match builder.openssl_dir(target) {
 548             Some(dir) => dir,
 549             None => return,
 550         };
 551
 552         let stamp = out.join(".stamp");
 553         let mut contents = String::new();
 554         drop(File::open(&stamp).and_then(|mut f| f.read_to_string(&mut contents)));
 555         if contents == OPENSSL_VERS {
 556             return
 557         }
 558         t!(fs::create_dir_all(&out));
 559
 560         let name = format!("openssl-{}.tar.gz", OPENSSL_VERS);
 561         let tarball = out.join(&name);
 562         if !tarball.exists() {
 563             let tmp = tarball.with_extension("tmp");
 564             // originally from https://www.openssl.org/source/...
 565             let url = format!("https://s3-us-west-1.amazonaws.com/rust-lang-ci2/rust-ci-mirror/{}",
 566                               name);
 567             let mut last_error = None;
 568             for _ in 0..3 {
 569                 let status = Command::new("curl")
 570                                 .arg("-o").arg(&tmp)
 571                                 .arg("-f")  // make curl fail if the URL does not return HTTP 200
 572                                 .arg(&url)
 573                                 .status()
 574                                 .expect("failed to spawn curl");
 575
 576                 // Retry if download failed.
 577                 if !status.success() {
 578                     last_error = Some(status.to_string());
 579                     continue;
 580                 }
 581
 582                 // Ensure the hash is correct.
 583                 let mut shasum = if target.contains("apple") ||
 584                     builder.config.build.contains("netbsd") {
 585                     let mut cmd = Command::new("shasum");
 586                     cmd.arg("-a").arg("256");
 587                     cmd
 588                 } else {
 589                     Command::new("sha256sum")
 590                 };
 591                 let output = output(&mut shasum.arg(&tmp));
 592                 let found = output.split_whitespace().next().unwrap();
 593
 594                 // If the hash is wrong, probably the download is incomplete or S3 served an error
 595                 // page. In any case, retry.
 596                 if found != OPENSSL_SHA256 {
 597                     last_error = Some(format!(
 598                         "downloaded openssl sha256 different\n\
 599                          expected: {}\n\
 600                          found:    {}\n",
 601                         OPENSSL_SHA256,
 602                         found
 603                     ));
 604                     continue;
 605                 }
 606
 607                 // Everything is fine, so exit the retry loop.
 608                 last_error = None;
 609                 break;
 610             }
 611             if let Some(error) = last_error {
 612                 panic!("failed to download openssl source: {}", error);
 613             }
 614             t!(fs::rename(&tmp, &tarball));
 615         }
 616         let obj = out.join(format!("openssl-{}", OPENSSL_VERS));
 617         let dst = builder.openssl_install_dir(target).unwrap();
 618         drop(fs::remove_dir_all(&obj));
 619         drop(fs::remove_dir_all(&dst));
 620         builder.run(Command::new("tar").arg("zxf").arg(&tarball).current_dir(&out));
 621
 622         let mut configure = Command::new("perl");
 623         configure.arg(obj.join("Configure"));
 624         configure.arg(format!("--prefix={}", dst.display()));
 625         configure.arg("no-dso");
 626         configure.arg("no-ssl2");
 627         configure.arg("no-ssl3");
 628
 629         let os = match &*target {
 630             "aarch64-linux-android" => "linux-aarch64",
 631             "aarch64-unknown-linux-gnu" => "linux-aarch64",
 632             "aarch64-unknown-linux-musl" => "linux-aarch64",
 633             "aarch64-unknown-netbsd" => "BSD-generic64",
 634             "arm-linux-androideabi" => "android",
 635             "arm-unknown-linux-gnueabi" => "linux-armv4",
 636             "arm-unknown-linux-gnueabihf" => "linux-armv4",
 637             "armv6-unknown-netbsd-eabihf" => "BSD-generic32",
 638             "armv7-linux-androideabi" => "android-armv7",
 639             "armv7-unknown-linux-gnueabihf" => "linux-armv4",
 640             "armv7-unknown-netbsd-eabihf" => "BSD-generic32",
 641             "i586-unknown-linux-gnu" => "linux-elf",
 642             "i586-unknown-linux-musl" => "linux-elf",
 643             "i686-apple-darwin" => "darwin-i386-cc",
 644             "i686-linux-android" => "android-x86",
 645             "i686-unknown-freebsd" => "BSD-x86-elf",
 646             "i686-unknown-linux-gnu" => "linux-elf",
 647             "i686-unknown-linux-musl" => "linux-elf",
 648             "i686-unknown-netbsd" => "BSD-x86-elf",
 649             "mips-unknown-linux-gnu" => "linux-mips32",
 650             "mips64-unknown-linux-gnuabi64" => "linux64-mips64",
 651             "mips64el-unknown-linux-gnuabi64" => "linux64-mips64",
 652             "mipsel-unknown-linux-gnu" => "linux-mips32",
 653             "powerpc-unknown-linux-gnu" => "linux-ppc",
 654             "powerpc-unknown-linux-gnuspe" => "linux-ppc",
 655             "powerpc-unknown-netbsd" => "BSD-generic32",
 656             "powerpc64-unknown-linux-gnu" => "linux-ppc64",
 657             "powerpc64le-unknown-linux-gnu" => "linux-ppc64le",
 658             "powerpc64le-unknown-linux-musl" => "linux-ppc64le",
 659             "s390x-unknown-linux-gnu" => "linux64-s390x",
 660             "sparc-unknown-linux-gnu" => "linux-sparcv9",
 661             "sparc64-unknown-linux-gnu" => "linux64-sparcv9",
 662             "sparc64-unknown-netbsd" => "BSD-sparc64",
 663             "x86_64-apple-darwin" => "darwin64-x86_64-cc",
 664             "x86_64-linux-android" => "linux-x86_64",
 665             "x86_64-unknown-freebsd" => "BSD-x86_64",
 666             "x86_64-unknown-dragonfly" => "BSD-x86_64",
 667             "x86_64-unknown-linux-gnu" => "linux-x86_64",
 668             "x86_64-unknown-linux-gnux32" => "linux-x32",
 669             "x86_64-unknown-linux-musl" => "linux-x86_64",
 670             "x86_64-unknown-netbsd" => "BSD-x86_64",
 671             _ => panic!("don't know how to configure OpenSSL for {}", target),
 672         };
 673         configure.arg(os);
 674         configure.env("CC", builder.cc(target));
 675         for flag in builder.cflags(target) {
 676             configure.arg(flag);
 677         }
 678         // There is no specific os target for android aarch64 or x86_64,
 679         // so we need to pass some extra cflags
 680         if target == "aarch64-linux-android" || target == "x86_64-linux-android" {
 681             configure.arg("-mandroid");
 682             configure.arg("-fomit-frame-pointer");
 683         }
 684         if target == "sparc64-unknown-netbsd" {
 685             // Need -m64 to get assembly generated correctly for sparc64.
 686             configure.arg("-m64");
 687             if builder.config.build.contains("netbsd") {
 688                 // Disable sparc64 asm on NetBSD builders, it uses
 689                 // m4(1)'s -B flag, which NetBSD m4 does not support.
 690                 configure.arg("no-asm");
 691             }
 692         }
 693         // Make PIE binaries
 694         // Non-PIE linker support was removed in Lollipop
 695         // https://source.android.com/security/enhancements/enhancements50
 696         if target == "i686-linux-android" {
 697             configure.arg("no-asm");
 698         }
 699         configure.current_dir(&obj);
 700         builder.info(&format!("Configuring openssl for {}", target));
 701         builder.run_quiet(&mut configure);
 702         builder.info(&format!("Building openssl for {}", target));
 703         builder.run_quiet(Command::new("make").arg("-j1").current_dir(&obj));
 704         builder.info(&format!("Installing openssl for {}", target));
 705         builder.run_quiet(Command::new("make").arg("install").arg("-j1").current_dir(&obj));
 706
 707         let mut f = t!(File::create(&stamp));
 708         t!(f.write_all(OPENSSL_VERS.as_bytes()));
 709     }
 710 }