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 Build;
  33 use util::{self, exe};
  34 use build_helper::up_to_date;
  35 use builder::{Builder, RunConfig, ShouldRun, Step};
  36 use cache::Interned;
  37
  38 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
  39 pub struct Llvm {
  40     pub target: Interned<String>,
  41     pub emscripten: bool,
  42 }
  43
  44 impl Step for Llvm {
  45     type Output = PathBuf; // path to llvm-config
  46
  47     const ONLY_HOSTS: bool = true;
  48
  49     fn should_run(run: ShouldRun) -> ShouldRun {
  50         run.path("src/llvm").path("src/llvm-emscripten")
  51     }
  52
  53     fn make_run(run: RunConfig) {
  54         let emscripten = run.path.ends_with("llvm-emscripten");
  55         run.builder.ensure(Llvm {
  56             target: run.target,
  57             emscripten,
  58         });
  59     }
  60
  61     /// Compile LLVM for `target`.
  62     fn run(self, builder: &Builder) -> PathBuf {
  63         let build = builder.build;
  64         let target = self.target;
  65         let emscripten = self.emscripten;
  66
  67         // If we're using a custom LLVM bail out here, but we can only use a
  68         // custom LLVM for the build triple.
  69         if !self.emscripten {
  70             if let Some(config) = build.config.target_config.get(&target) {
  71                 if let Some(ref s) = config.llvm_config {
  72                     check_llvm_version(build, s);
  73                     return s.to_path_buf()
  74                 }
  75             }
  76         }
  77
  78         let rebuild_trigger = build.src.join("src/rustllvm/llvm-rebuild-trigger");
  79         let mut rebuild_trigger_contents = String::new();
  80         t!(t!(File::open(&rebuild_trigger)).read_to_string(&mut rebuild_trigger_contents));
  81
  82         let (out_dir, llvm_config_ret_dir) = if emscripten {
  83             let dir = build.emscripten_llvm_out(target);
  84             let config_dir = dir.join("bin");
  85             (dir, config_dir)
  86         } else {
  87             let mut dir = build.llvm_out(build.config.build);
  88             if !build.config.build.contains("msvc") || build.config.ninja {
  89                 dir.push("build");
  90             }
  91             (build.llvm_out(target), dir.join("bin"))
  92         };
  93         let done_stamp = out_dir.join("llvm-finished-building");
  94         let build_llvm_config = llvm_config_ret_dir
  95             .join(exe("llvm-config", &*build.config.build));
  96         if done_stamp.exists() {
  97             let mut done_contents = String::new();
  98             t!(t!(File::open(&done_stamp)).read_to_string(&mut done_contents));
  99
 100             // If LLVM was already built previously and contents of the rebuild-trigger file
 101             // didn't change from the previous build, then no action is required.
 102             if done_contents == rebuild_trigger_contents {
 103                 return build_llvm_config
 104             }
 105         }
 106
 107         let _folder = build.fold_output(|| "llvm");
 108         let descriptor = if emscripten { "Emscripten " } else { "" };
 109         println!("Building {}LLVM for {}", descriptor, target);
 110         let _time = util::timeit();
 111         t!(fs::create_dir_all(&out_dir));
 112
 113         // http://llvm.org/docs/CMake.html
 114         let root = if self.emscripten { "src/llvm-emscripten" } else { "src/llvm" };
 115         let mut cfg = cmake::Config::new(build.src.join(root));
 116
 117         let profile = match (build.config.llvm_optimize, build.config.llvm_release_debuginfo) {
 118             (false, _) => "Debug",
 119             (true, false) => "Release",
 120             (true, true) => "RelWithDebInfo",
 121         };
 122
 123         // NOTE: remember to also update `config.toml.example` when changing the
 124         // defaults!
 125         let llvm_targets = if self.emscripten {
 126             "JSBackend"
 127         } else {
 128             match build.config.llvm_targets {
 129                 Some(ref s) => s,
 130                 None => "X86;ARM;AArch64;Mips;PowerPC;SystemZ;MSP430;Sparc;NVPTX;Hexagon",
 131             }
 132         };
 133
 134         let llvm_exp_targets = if self.emscripten {
 135             ""
 136         } else {
 137             &build.config.llvm_experimental_targets[..]
 138         };
 139
 140         let assertions = if build.config.llvm_assertions {"ON"} else {"OFF"};
 141
 142         cfg.out_dir(&out_dir)
 143            .profile(profile)
 144            .define("LLVM_ENABLE_ASSERTIONS", assertions)
 145            .define("LLVM_TARGETS_TO_BUILD", llvm_targets)
 146            .define("LLVM_EXPERIMENTAL_TARGETS_TO_BUILD", llvm_exp_targets)
 147            .define("LLVM_INCLUDE_EXAMPLES", "OFF")
 148            .define("LLVM_INCLUDE_TESTS", "OFF")
 149            .define("LLVM_INCLUDE_DOCS", "OFF")
 150            .define("LLVM_ENABLE_ZLIB", "OFF")
 151            .define("WITH_POLLY", "OFF")
 152            .define("LLVM_ENABLE_TERMINFO", "OFF")
 153            .define("LLVM_ENABLE_LIBEDIT", "OFF")
 154            .define("LLVM_PARALLEL_COMPILE_JOBS", build.jobs().to_string())
 155            .define("LLVM_TARGET_ARCH", target.split('-').next().unwrap())
 156            .define("LLVM_DEFAULT_TARGET_TRIPLE", target);
 157
 158         // By default, LLVM will automatically find OCaml and, if it finds it,
 159         // install the LLVM bindings in LLVM_OCAML_INSTALL_PATH, which defaults
 160         // to /usr/bin/ocaml.
 161         // This causes problem for non-root builds of Rust. Side-step the issue
 162         // by setting LLVM_OCAML_INSTALL_PATH to a relative path, so it installs
 163         // in the prefix.
 164         cfg.define("LLVM_OCAML_INSTALL_PATH",
 165             env::var_os("LLVM_OCAML_INSTALL_PATH").unwrap_or_else(|| "usr/lib/ocaml".into()));
 166
 167         // This setting makes the LLVM tools link to the dynamic LLVM library,
 168         // which saves both memory during parallel links and overall disk space
 169         // for the tools.  We don't distribute any of those tools, so this is
 170         // just a local concern.  However, it doesn't work well everywhere.
 171         if target.contains("linux-gnu") || target.contains("apple-darwin") {
 172            cfg.define("LLVM_LINK_LLVM_DYLIB", "ON");
 173         }
 174
 175         if target.contains("msvc") {
 176             cfg.define("LLVM_USE_CRT_DEBUG", "MT");
 177             cfg.define("LLVM_USE_CRT_RELEASE", "MT");
 178             cfg.define("LLVM_USE_CRT_RELWITHDEBINFO", "MT");
 179             cfg.static_crt(true);
 180         }
 181
 182         if target.starts_with("i686") {
 183             cfg.define("LLVM_BUILD_32_BITS", "ON");
 184         }
 185
 186         if let Some(num_linkers) = build.config.llvm_link_jobs {
 187             if num_linkers > 0 {
 188                 cfg.define("LLVM_PARALLEL_LINK_JOBS", num_linkers.to_string());
 189             }
 190         }
 191
 192         // http://llvm.org/docs/HowToCrossCompileLLVM.html
 193         if target != build.build && !emscripten {
 194             builder.ensure(Llvm {
 195                 target: build.build,
 196                 emscripten: false,
 197             });
 198             // FIXME: if the llvm root for the build triple is overridden then we
 199             //        should use llvm-tblgen from there, also should verify that it
 200             //        actually exists most of the time in normal installs of LLVM.
 201             let host = build.llvm_out(build.build).join("bin/llvm-tblgen");
 202             cfg.define("CMAKE_CROSSCOMPILING", "True")
 203                .define("LLVM_TABLEGEN", &host);
 204
 205             if target.contains("netbsd") {
 206                cfg.define("CMAKE_SYSTEM_NAME", "NetBSD");
 207             } else if target.contains("freebsd") {
 208                cfg.define("CMAKE_SYSTEM_NAME", "FreeBSD");
 209             }
 210
 211             cfg.define("LLVM_NATIVE_BUILD", build.llvm_out(build.build).join("build"));
 212         }
 213
 214         configure_cmake(build, target, &mut cfg, false);
 215
 216         // FIXME: we don't actually need to build all LLVM tools and all LLVM
 217         //        libraries here, e.g. we just want a few components and a few
 218         //        tools. Figure out how to filter them down and only build the right
 219         //        tools and libs on all platforms.
 220         cfg.build();
 221
 222         t!(t!(File::create(&done_stamp)).write_all(rebuild_trigger_contents.as_bytes()));
 223
 224         build_llvm_config
 225     }
 226 }
 227
 228 fn check_llvm_version(build: &Build, llvm_config: &Path) {
 229     if !build.config.llvm_version_check {
 230         return
 231     }
 232
 233     let mut cmd = Command::new(llvm_config);
 234     let version = output(cmd.arg("--version"));
 235     let mut parts = version.split('.').take(2)
 236         .filter_map(|s| s.parse::<u32>().ok());
 237     if let (Some(major), Some(minor)) = (parts.next(), parts.next()) {
 238         if major > 3 || (major == 3 && minor >= 9) {
 239             return
 240         }
 241     }
 242     panic!("\n\nbad LLVM version: {}, need >=3.9\n\n", version)
 243 }
 244
 245 fn configure_cmake(build: &Build,
 246                    target: Interned<String>,
 247                    cfg: &mut cmake::Config,
 248                    building_dist_binaries: bool) {
 249     if build.config.ninja {
 250         cfg.generator("Ninja");
 251     }
 252     cfg.target(&target)
 253        .host(&build.config.build);
 254
 255     let sanitize_cc = |cc: &Path| {
 256         if target.contains("msvc") {
 257             OsString::from(cc.to_str().unwrap().replace("\\", "/"))
 258         } else {
 259             cc.as_os_str().to_owned()
 260         }
 261     };
 262
 263     // MSVC with CMake uses msbuild by default which doesn't respect these
 264     // vars that we'd otherwise configure. In that case we just skip this
 265     // entirely.
 266     if target.contains("msvc") && !build.config.ninja {
 267         return
 268     }
 269
 270     let cc = build.cc(target);
 271     let cxx = build.cxx(target).unwrap();
 272
 273     // Handle msvc + ninja + ccache specially (this is what the bots use)
 274     if target.contains("msvc") &&
 275        build.config.ninja &&
 276        build.config.ccache.is_some() {
 277         let mut cc = env::current_exe().expect("failed to get cwd");
 278         cc.set_file_name("sccache-plus-cl.exe");
 279
 280        cfg.define("CMAKE_C_COMPILER", sanitize_cc(&cc))
 281           .define("CMAKE_CXX_COMPILER", sanitize_cc(&cc));
 282        cfg.env("SCCACHE_PATH",
 283                build.config.ccache.as_ref().unwrap())
 284           .env("SCCACHE_TARGET", target);
 285
 286     // If ccache is configured we inform the build a little differently hwo
 287     // to invoke ccache while also invoking our compilers.
 288     } else if let Some(ref ccache) = build.config.ccache {
 289        cfg.define("CMAKE_C_COMPILER", ccache)
 290           .define("CMAKE_C_COMPILER_ARG1", sanitize_cc(cc))
 291           .define("CMAKE_CXX_COMPILER", ccache)
 292           .define("CMAKE_CXX_COMPILER_ARG1", sanitize_cc(cxx));
 293     } else {
 294        cfg.define("CMAKE_C_COMPILER", sanitize_cc(cc))
 295           .define("CMAKE_CXX_COMPILER", sanitize_cc(cxx));
 296     }
 297
 298     cfg.build_arg("-j").build_arg(build.jobs().to_string());
 299     cfg.define("CMAKE_C_FLAGS", build.cflags(target).join(" "));
 300     let mut cxxflags = build.cflags(target).join(" ");
 301     if building_dist_binaries {
 302         if build.config.llvm_static_stdcpp && !target.contains("windows") {
 303             cxxflags.push_str(" -static-libstdc++");
 304         }
 305     }
 306     cfg.define("CMAKE_CXX_FLAGS", cxxflags);
 307     if let Some(ar) = build.ar(target) {
 308         if ar.is_absolute() {
 309             // LLVM build breaks if `CMAKE_AR` is a relative path, for some reason it
 310             // tries to resolve this path in the LLVM build directory.
 311             cfg.define("CMAKE_AR", sanitize_cc(ar));
 312         }
 313     }
 314
 315     if env::var_os("SCCACHE_ERROR_LOG").is_some() {
 316         cfg.env("RUST_LOG", "sccache=warn");
 317     }
 318 }
 319
 320 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 321 pub struct Lld {
 322     pub target: Interned<String>,
 323 }
 324
 325 impl Step for Lld {
 326     type Output = PathBuf;
 327     const ONLY_HOSTS: bool = true;
 328
 329     fn should_run(run: ShouldRun) -> ShouldRun {
 330         run.path("src/tools/lld")
 331     }
 332
 333     fn make_run(run: RunConfig) {
 334         run.builder.ensure(Lld { target: run.target });
 335     }
 336
 337     /// Compile LLVM for `target`.
 338     fn run(self, builder: &Builder) -> PathBuf {
 339         let target = self.target;
 340         let build = builder.build;
 341
 342         let llvm_config = builder.ensure(Llvm {
 343             target: self.target,
 344             emscripten: false,
 345         });
 346
 347         let out_dir = build.lld_out(target);
 348         let done_stamp = out_dir.join("lld-finished-building");
 349         if done_stamp.exists() {
 350             return out_dir
 351         }
 352
 353         let _folder = build.fold_output(|| "lld");
 354         println!("Building LLD for {}", target);
 355         let _time = util::timeit();
 356         t!(fs::create_dir_all(&out_dir));
 357
 358         let mut cfg = cmake::Config::new(build.src.join("src/tools/lld"));
 359         configure_cmake(build, target, &mut cfg, true);
 360
 361         cfg.out_dir(&out_dir)
 362            .profile("Release")
 363            .define("LLVM_CONFIG_PATH", llvm_config)
 364            .define("LLVM_INCLUDE_TESTS", "OFF");
 365
 366         cfg.build();
 367
 368         t!(File::create(&done_stamp));
 369         out_dir
 370     }
 371 }
 372
 373 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 374 pub struct TestHelpers {
 375     pub target: Interned<String>,
 376 }
 377
 378 impl Step for TestHelpers {
 379     type Output = ();
 380
 381     fn should_run(run: ShouldRun) -> ShouldRun {
 382         run.path("src/test/auxiliary/rust_test_helpers.c")
 383     }
 384
 385     fn make_run(run: RunConfig) {
 386         run.builder.ensure(TestHelpers { target: run.target })
 387     }
 388
 389     /// Compiles the `rust_test_helpers.c` library which we used in various
 390     /// `run-pass` test suites for ABI testing.
 391     fn run(self, builder: &Builder) {
 392         let build = builder.build;
 393         let target = self.target;
 394         let dst = build.test_helpers_out(target);
 395         let src = build.src.join("src/test/auxiliary/rust_test_helpers.c");
 396         if up_to_date(&src, &dst.join("librust_test_helpers.a")) {
 397             return
 398         }
 399
 400         let _folder = build.fold_output(|| "build_test_helpers");
 401         println!("Building test helpers");
 402         t!(fs::create_dir_all(&dst));
 403         let mut cfg = cc::Build::new();
 404
 405         // We may have found various cross-compilers a little differently due to our
 406         // extra configuration, so inform gcc of these compilers. Note, though, that
 407         // on MSVC we still need gcc's detection of env vars (ugh).
 408         if !target.contains("msvc") {
 409             if let Some(ar) = build.ar(target) {
 410                 cfg.archiver(ar);
 411             }
 412             cfg.compiler(build.cc(target));
 413         }
 414
 415         cfg.cargo_metadata(false)
 416            .out_dir(&dst)
 417            .target(&target)
 418            .host(&build.build)
 419            .opt_level(0)
 420            .warnings(false)
 421            .debug(false)
 422            .file(build.src.join("src/test/auxiliary/rust_test_helpers.c"))
 423            .compile("rust_test_helpers");
 424     }
 425 }
 426
 427 const OPENSSL_VERS: &'static str = "1.0.2n";
 428 const OPENSSL_SHA256: &'static str =
 429     "370babb75f278c39e0c50e8c4e7493bc0f18db6867478341a832a982fd15a8fe";
 430
 431 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 432 pub struct Openssl {
 433     pub target: Interned<String>,
 434 }
 435
 436 impl Step for Openssl {
 437     type Output = ();
 438
 439     fn should_run(run: ShouldRun) -> ShouldRun {
 440         run.never()
 441     }
 442
 443     fn run(self, builder: &Builder) {
 444         let build = builder.build;
 445         let target = self.target;
 446         let out = match build.openssl_dir(target) {
 447             Some(dir) => dir,
 448             None => return,
 449         };
 450
 451         let stamp = out.join(".stamp");
 452         let mut contents = String::new();
 453         drop(File::open(&stamp).and_then(|mut f| f.read_to_string(&mut contents)));
 454         if contents == OPENSSL_VERS {
 455             return
 456         }
 457         t!(fs::create_dir_all(&out));
 458
 459         let name = format!("openssl-{}.tar.gz", OPENSSL_VERS);
 460         let tarball = out.join(&name);
 461         if !tarball.exists() {
 462             let tmp = tarball.with_extension("tmp");
 463             // originally from https://www.openssl.org/source/...
 464             let url = format!("https://s3-us-west-1.amazonaws.com/rust-lang-ci2/rust-ci-mirror/{}",
 465                               name);
 466             let mut last_error = None;
 467             for _ in 0..3 {
 468                 let status = Command::new("curl")
 469                                 .arg("-o").arg(&tmp)
 470                                 .arg("-f")  // make curl fail if the URL does not return HTTP 200
 471                                 .arg(&url)
 472                                 .status()
 473                                 .expect("failed to spawn curl");
 474
 475                 // Retry if download failed.
 476                 if !status.success() {
 477                     last_error = Some(status.to_string());
 478                     continue;
 479                 }
 480
 481                 // Ensure the hash is correct.
 482                 let mut shasum = if target.contains("apple") || build.build.contains("netbsd") {
 483                     let mut cmd = Command::new("shasum");
 484                     cmd.arg("-a").arg("256");
 485                     cmd
 486                 } else {
 487                     Command::new("sha256sum")
 488                 };
 489                 let output = output(&mut shasum.arg(&tmp));
 490                 let found = output.split_whitespace().next().unwrap();
 491
 492                 // If the hash is wrong, probably the download is incomplete or S3 served an error
 493                 // page. In any case, retry.
 494                 if found != OPENSSL_SHA256 {
 495                     last_error = Some(format!(
 496                         "downloaded openssl sha256 different\n\
 497                          expected: {}\n\
 498                          found:    {}\n",
 499                         OPENSSL_SHA256,
 500                         found
 501                     ));
 502                     continue;
 503                 }
 504
 505                 // Everything is fine, so exit the retry loop.
 506                 last_error = None;
 507                 break;
 508             }
 509             if let Some(error) = last_error {
 510                 panic!("failed to download openssl source: {}", error);
 511             }
 512             t!(fs::rename(&tmp, &tarball));
 513         }
 514         let obj = out.join(format!("openssl-{}", OPENSSL_VERS));
 515         let dst = build.openssl_install_dir(target).unwrap();
 516         drop(fs::remove_dir_all(&obj));
 517         drop(fs::remove_dir_all(&dst));
 518         build.run(Command::new("tar").arg("zxf").arg(&tarball).current_dir(&out));
 519
 520         let mut configure = Command::new("perl");
 521         configure.arg(obj.join("Configure"));
 522         configure.arg(format!("--prefix={}", dst.display()));
 523         configure.arg("no-dso");
 524         configure.arg("no-ssl2");
 525         configure.arg("no-ssl3");
 526
 527         let os = match &*target {
 528             "aarch64-linux-android" => "linux-aarch64",
 529             "aarch64-unknown-linux-gnu" => "linux-aarch64",
 530             "aarch64-unknown-linux-musl" => "linux-aarch64",
 531             "arm-linux-androideabi" => "android",
 532             "arm-unknown-linux-gnueabi" => "linux-armv4",
 533             "arm-unknown-linux-gnueabihf" => "linux-armv4",
 534             "armv7-linux-androideabi" => "android-armv7",
 535             "armv7-unknown-linux-gnueabihf" => "linux-armv4",
 536             "i586-unknown-linux-gnu" => "linux-elf",
 537             "i586-unknown-linux-musl" => "linux-elf",
 538             "i686-apple-darwin" => "darwin-i386-cc",
 539             "i686-linux-android" => "android-x86",
 540             "i686-unknown-freebsd" => "BSD-x86-elf",
 541             "i686-unknown-linux-gnu" => "linux-elf",
 542             "i686-unknown-linux-musl" => "linux-elf",
 543             "i686-unknown-netbsd" => "BSD-x86-elf",
 544             "mips-unknown-linux-gnu" => "linux-mips32",
 545             "mips64-unknown-linux-gnuabi64" => "linux64-mips64",
 546             "mips64el-unknown-linux-gnuabi64" => "linux64-mips64",
 547             "mipsel-unknown-linux-gnu" => "linux-mips32",
 548             "powerpc-unknown-linux-gnu" => "linux-ppc",
 549             "powerpc-unknown-linux-gnuspe" => "linux-ppc",
 550             "powerpc-unknown-netbsd" => "BSD-generic32",
 551             "powerpc64-unknown-linux-gnu" => "linux-ppc64",
 552             "powerpc64le-unknown-linux-gnu" => "linux-ppc64le",
 553             "s390x-unknown-linux-gnu" => "linux64-s390x",
 554             "sparc-unknown-linux-gnu" => "linux-sparcv9",
 555             "sparc64-unknown-linux-gnu" => "linux64-sparcv9",
 556             "sparc64-unknown-netbsd" => "BSD-sparc64",
 557             "x86_64-apple-darwin" => "darwin64-x86_64-cc",
 558             "x86_64-linux-android" => "linux-x86_64",
 559             "x86_64-unknown-freebsd" => "BSD-x86_64",
 560             "x86_64-unknown-dragonfly" => "BSD-x86_64",
 561             "x86_64-unknown-linux-gnu" => "linux-x86_64",
 562             "x86_64-unknown-linux-gnux32" => "linux-x32",
 563             "x86_64-unknown-linux-musl" => "linux-x86_64",
 564             "x86_64-unknown-netbsd" => "BSD-x86_64",
 565             _ => panic!("don't know how to configure OpenSSL for {}", target),
 566         };
 567         configure.arg(os);
 568         configure.env("CC", build.cc(target));
 569         for flag in build.cflags(target) {
 570             configure.arg(flag);
 571         }
 572         // There is no specific os target for android aarch64 or x86_64,
 573         // so we need to pass some extra cflags
 574         if target == "aarch64-linux-android" || target == "x86_64-linux-android" {
 575             configure.arg("-mandroid");
 576             configure.arg("-fomit-frame-pointer");
 577         }
 578         if target == "sparc64-unknown-netbsd" {
 579             // Need -m64 to get assembly generated correctly for sparc64.
 580             configure.arg("-m64");
 581             if build.build.contains("netbsd") {
 582                 // Disable sparc64 asm on NetBSD builders, it uses
 583                 // m4(1)'s -B flag, which NetBSD m4 does not support.
 584                 configure.arg("no-asm");
 585             }
 586         }
 587         // Make PIE binaries
 588         // Non-PIE linker support was removed in Lollipop
 589         // https://source.android.com/security/enhancements/enhancements50
 590         if target == "i686-linux-android" {
 591             configure.arg("no-asm");
 592         }
 593         configure.current_dir(&obj);
 594         println!("Configuring openssl for {}", target);
 595         build.run_quiet(&mut configure);
 596         println!("Building openssl for {}", target);
 597         build.run_quiet(Command::new("make").arg("-j1").current_dir(&obj));
 598         println!("Installing openssl for {}", target);
 599         build.run_quiet(Command::new("make").arg("install").arg("-j1").current_dir(&obj));
 600
 601         let mut f = t!(File::create(&stamp));
 602         t!(f.write_all(OPENSSL_VERS.as_bytes()));
 603     }
 604 }