src/bootstrap/native.rs - third_party/rust - Git at Google

 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.

 //! Compilation of native dependencies like LLVM.
 //!
 //! Native projects like LLVM unfortunately aren't suited just yet for
 //! compilation in build scripts that Cargo has. This is because the
 //! compilation takes a *very* long time but also because we don't want to
 //! compile LLVM 3 times as part of a normal bootstrap (we want it cached).
 //!
 //! LLVM and compiler-rt are essentially just wired up to everything else to
 //! ensure that they're always in place if needed.

 use std::env;
 use std::ffi::OsString;
 use std::fs::{self, File};
 use std::io::{Read, Write};
 use std::path::{Path, PathBuf};
 use std::process::Command;

 use build_helper::output;
 use cmake;
 use cc;

 use util::{self, exe};
 use build_helper::up_to_date;
 use builder::{Builder, RunConfig, ShouldRun, Step};
 use cache::Interned;

 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct Llvm {
     pub target: Interned<String>,
     pub emscripten: bool,
 }

 impl Step for Llvm {
     type Output = PathBuf; // path to llvm-config

     const ONLY_HOSTS: bool = true;

     fn should_run(run: ShouldRun) -> ShouldRun {
         run.path("src/llvm").path("src/llvm-emscripten")
     }

     fn make_run(run: RunConfig) {
         let emscripten = run.path.ends_with("llvm-emscripten");
         run.builder.ensure(Llvm {
             target: run.target,
             emscripten,
         });
     }

     /// Compile LLVM for `target`.
     fn run(self, builder: &Builder) -> PathBuf {
         let target = self.target;
         let emscripten = self.emscripten;

         // If we're using a custom LLVM bail out here, but we can only use a
         // custom LLVM for the build triple.
         if !self.emscripten {
             if let Some(config) = builder.config.target_config.get(&target) {
                 if let Some(ref s) = config.llvm_config {
                     check_llvm_version(builder, s);
                     return s.to_path_buf()
                 }
             }
         }

         let rebuild_trigger = builder.src.join("src/rustllvm/llvm-rebuild-trigger");
         let mut rebuild_trigger_contents = String::new();
         t!(t!(File::open(&rebuild_trigger)).read_to_string(&mut rebuild_trigger_contents));

         let (out_dir, llvm_config_ret_dir) = if emscripten {
             let dir = builder.emscripten_llvm_out(target);
             let config_dir = dir.join("bin");
             (dir, config_dir)
         } else {
             let mut dir = builder.llvm_out(builder.config.build);
             if !builder.config.build.contains("msvc") || builder.config.ninja {
                 dir.push("build");
             }
             (builder.llvm_out(target), dir.join("bin"))
         };
         let done_stamp = out_dir.join("llvm-finished-building");
         let build_llvm_config = llvm_config_ret_dir
             .join(exe("llvm-config", &*builder.config.build));
         if done_stamp.exists() {
             let mut done_contents = String::new();
             t!(t!(File::open(&done_stamp)).read_to_string(&mut done_contents));

             // If LLVM was already built previously and contents of the rebuild-trigger file
             // didn't change from the previous build, then no action is required.
             if done_contents == rebuild_trigger_contents {
                 return build_llvm_config
             }
         }

         let _folder = builder.fold_output(|| "llvm");
         let descriptor = if emscripten { "Emscripten " } else { "" };
         builder.info(&format!("Building {}LLVM for {}", descriptor, target));
         let _time = util::timeit(&builder);
         t!(fs::create_dir_all(&out_dir));

         // http://llvm.org/docs/CMake.html
         let root = if self.emscripten { "src/llvm-emscripten" } else { "src/llvm" };
         let mut cfg = cmake::Config::new(builder.src.join(root));

         let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
             (false, _) => "Debug",
             (true, false) => "Release",
             (true, true) => "RelWithDebInfo",
         };

         // NOTE: remember to also update `config.toml.example` when changing the
         // defaults!
         let llvm_targets = if self.emscripten {
             "JSBackend"
         } else {
             match builder.config.llvm_targets {
                 Some(ref s) => s,
                 None => "X86;ARM;AArch64;Mips;PowerPC;SystemZ;MSP430;Sparc;NVPTX;Hexagon",
             }
         };

         let llvm_exp_targets = if self.emscripten {
             ""
         } else {
             &builder.config.llvm_experimental_targets[..]
         };

         let assertions = if builder.config.llvm_assertions {"ON"} else {"OFF"};

         cfg.out_dir(&out_dir)
            .profile(profile)
            .define("LLVM_ENABLE_ASSERTIONS", assertions)
            .define("LLVM_TARGETS_TO_BUILD", llvm_targets)
            .define("LLVM_EXPERIMENTAL_TARGETS_TO_BUILD", llvm_exp_targets)
            .define("LLVM_INCLUDE_EXAMPLES", "OFF")
            .define("LLVM_INCLUDE_TESTS", "OFF")
            .define("LLVM_INCLUDE_DOCS", "OFF")
            .define("LLVM_ENABLE_ZLIB", "OFF")
            .define("WITH_POLLY", "OFF")
            .define("LLVM_ENABLE_TERMINFO", "OFF")
            .define("LLVM_ENABLE_LIBEDIT", "OFF")
            .define("LLVM_ENABLE_LIBXML2", "OFF")
            .define("LLVM_PARALLEL_COMPILE_JOBS", builder.jobs().to_string())
            .define("LLVM_TARGET_ARCH", target.split('-').next().unwrap())
            .define("LLVM_DEFAULT_TARGET_TRIPLE", target);

         // By default, LLVM will automatically find OCaml and, if it finds it,
         // install the LLVM bindings in LLVM_OCAML_INSTALL_PATH, which defaults
         // to /usr/bin/ocaml.
         // This causes problem for non-root builds of Rust. Side-step the issue
         // by setting LLVM_OCAML_INSTALL_PATH to a relative path, so it installs
         // in the prefix.
         cfg.define("LLVM_OCAML_INSTALL_PATH",
             env::var_os("LLVM_OCAML_INSTALL_PATH").unwrap_or_else(|| "usr/lib/ocaml".into()));

         // This setting makes the LLVM tools link to the dynamic LLVM library,
         // which saves both memory during parallel links and overall disk space
         // for the tools.  We don't distribute any of those tools, so this is
         // just a local concern.  However, it doesn't work well everywhere.
         if target.contains("linux-gnu") || target.contains("apple-darwin") {
            cfg.define("LLVM_LINK_LLVM_DYLIB", "ON");
         }

         if target.contains("msvc") {
             cfg.define("LLVM_USE_CRT_DEBUG", "MT");
             cfg.define("LLVM_USE_CRT_RELEASE", "MT");
             cfg.define("LLVM_USE_CRT_RELWITHDEBINFO", "MT");
             cfg.static_crt(true);
         }

         if target.starts_with("i686") {
             cfg.define("LLVM_BUILD_32_BITS", "ON");
         }

         if let Some(num_linkers) = builder.config.llvm_link_jobs {
             if num_linkers > 0 {
                 cfg.define("LLVM_PARALLEL_LINK_JOBS", num_linkers.to_string());
             }
         }

         // http://llvm.org/docs/HowToCrossCompileLLVM.html
         if target != builder.config.build && !emscripten {
             builder.ensure(Llvm {
                 target: builder.config.build,
                 emscripten: false,
             });
             // FIXME: if the llvm root for the build triple is overridden then we
             //        should use llvm-tblgen from there, also should verify that it
             //        actually exists most of the time in normal installs of LLVM.
             let host = builder.llvm_out(builder.config.build).join("bin/llvm-tblgen");
             cfg.define("CMAKE_CROSSCOMPILING", "True")
                .define("LLVM_TABLEGEN", &host);

             if target.contains("netbsd") {
                cfg.define("CMAKE_SYSTEM_NAME", "NetBSD");
             } else if target.contains("freebsd") {
                cfg.define("CMAKE_SYSTEM_NAME", "FreeBSD");
             }

             cfg.define("LLVM_NATIVE_BUILD", builder.llvm_out(builder.config.build).join("build"));
         }

         configure_cmake(builder, target, &mut cfg, false);

         // FIXME: we don't actually need to build all LLVM tools and all LLVM
         //        libraries here, e.g. we just want a few components and a few
         //        tools. Figure out how to filter them down and only build the right
         //        tools and libs on all platforms.

         if builder.config.dry_run {
             return build_llvm_config;
         }

         cfg.build();

         t!(t!(File::create(&done_stamp)).write_all(rebuild_trigger_contents.as_bytes()));

         build_llvm_config
     }
 }

 fn check_llvm_version(builder: &Builder, llvm_config: &Path) {
     if !builder.config.llvm_version_check {
         return
     }

     if builder.config.dry_run {
         return;
     }

     let mut cmd = Command::new(llvm_config);
     let version = output(cmd.arg("--version"));
     let mut parts = version.split('.').take(2)
         .filter_map(|s| s.parse::<u32>().ok());
     if let (Some(major), Some(minor)) = (parts.next(), parts.next()) {
         if major > 3 || (major == 3 && minor >= 9) {
             return
         }
     }
     panic!("\n\nbad LLVM version: {}, need >=3.9\n\n", version)
 }

 fn configure_cmake(builder: &Builder,
                    target: Interned<String>,
                    cfg: &mut cmake::Config,
                    building_dist_binaries: bool) {
     if builder.config.ninja {
         cfg.generator("Ninja");
     }
     cfg.target(&target)
        .host(&builder.config.build);

     let sanitize_cc = |cc: &Path| {
         if target.contains("msvc") {
             OsString::from(cc.to_str().unwrap().replace("\\", "/"))
         } else {
             cc.as_os_str().to_owned()
         }
     };

     // MSVC with CMake uses msbuild by default which doesn't respect these
     // vars that we'd otherwise configure. In that case we just skip this
     // entirely.
     if target.contains("msvc") && !builder.config.ninja {
         return
     }

     let cc = builder.cc(target);
     let cxx = builder.cxx(target).unwrap();

     // Handle msvc + ninja + ccache specially (this is what the bots use)
     if target.contains("msvc") &&
        builder.config.ninja &&
        builder.config.ccache.is_some() {
         let mut cc = env::current_exe().expect("failed to get cwd");
         cc.set_file_name("sccache-plus-cl.exe");

        cfg.define("CMAKE_C_COMPILER", sanitize_cc(&cc))
           .define("CMAKE_CXX_COMPILER", sanitize_cc(&cc));
        cfg.env("SCCACHE_PATH",
                builder.config.ccache.as_ref().unwrap())
           .env("SCCACHE_TARGET", target);

     // If ccache is configured we inform the build a little differently hwo
     // to invoke ccache while also invoking our compilers.
     } else if let Some(ref ccache) = builder.config.ccache {
        cfg.define("CMAKE_C_COMPILER", ccache)
           .define("CMAKE_C_COMPILER_ARG1", sanitize_cc(cc))
           .define("CMAKE_CXX_COMPILER", ccache)
           .define("CMAKE_CXX_COMPILER_ARG1", sanitize_cc(cxx));
     } else {
        cfg.define("CMAKE_C_COMPILER", sanitize_cc(cc))
           .define("CMAKE_CXX_COMPILER", sanitize_cc(cxx));
     }

     cfg.build_arg("-j").build_arg(builder.jobs().to_string());
     cfg.define("CMAKE_C_FLAGS", builder.cflags(target).join(" "));
     let mut cxxflags = builder.cflags(target).join(" ");
     if building_dist_binaries {
         if builder.config.llvm_static_stdcpp && !target.contains("windows") {
             cxxflags.push_str(" -static-libstdc++");
         }
     }
     cfg.define("CMAKE_CXX_FLAGS", cxxflags);
     if let Some(ar) = builder.ar(target) {
         if ar.is_absolute() {
             // LLVM build breaks if `CMAKE_AR` is a relative path, for some reason it
             // tries to resolve this path in the LLVM build directory.
             cfg.define("CMAKE_AR", sanitize_cc(ar));
         }
     }

     if env::var_os("SCCACHE_ERROR_LOG").is_some() {
         cfg.env("RUST_LOG", "sccache=warn");
     }
 }

 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct Lld {
     pub target: Interned<String>,
 }

 impl Step for Lld {
     type Output = PathBuf;
     const ONLY_HOSTS: bool = true;

     fn should_run(run: ShouldRun) -> ShouldRun {
         run.path("src/tools/lld")
     }

     fn make_run(run: RunConfig) {
         run.builder.ensure(Lld { target: run.target });
     }

     /// Compile LLVM for `target`.
     fn run(self, builder: &Builder) -> PathBuf {
         if builder.config.dry_run {
             return PathBuf::from("lld-out-dir-test-gen");
         }
         let target = self.target;

         let llvm_config = builder.ensure(Llvm {
             target: self.target,
             emscripten: false,
         });

         let out_dir = builder.lld_out(target);
         let done_stamp = out_dir.join("lld-finished-building");
         if done_stamp.exists() {
             return out_dir
         }

         let _folder = builder.fold_output(|| "lld");
         builder.info(&format!("Building LLD for {}", target));
         let _time = util::timeit(&builder);
         t!(fs::create_dir_all(&out_dir));

         let mut cfg = cmake::Config::new(builder.src.join("src/tools/lld"));
         configure_cmake(builder, target, &mut cfg, true);

         cfg.out_dir(&out_dir)
            .profile("Release")
            .define("LLVM_CONFIG_PATH", llvm_config)
            .define("LLVM_INCLUDE_TESTS", "OFF");

         cfg.build();

         t!(File::create(&done_stamp));
         out_dir
     }
 }

 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct TestHelpers {
     pub target: Interned<String>,
 }

 impl Step for TestHelpers {
     type Output = ();

     fn should_run(run: ShouldRun) -> ShouldRun {
         run.path("src/test/auxiliary/rust_test_helpers.c")
     }

     fn make_run(run: RunConfig) {
         run.builder.ensure(TestHelpers { target: run.target })
     }

     /// Compiles the `rust_test_helpers.c` library which we used in various
     /// `run-pass` test suites for ABI testing.
     fn run(self, builder: &Builder) {
         if builder.config.dry_run {
             return;
         }
         let target = self.target;
         let dst = builder.test_helpers_out(target);
         let src = builder.src.join("src/test/auxiliary/rust_test_helpers.c");
         if up_to_date(&src, &dst.join("librust_test_helpers.a")) {
             return
         }

         let _folder = builder.fold_output(|| "build_test_helpers");
         builder.info(&format!("Building test helpers"));
         t!(fs::create_dir_all(&dst));
         let mut cfg = cc::Build::new();

         // We may have found various cross-compilers a little differently due to our
         // extra configuration, so inform gcc of these compilers. Note, though, that
         // on MSVC we still need gcc's detection of env vars (ugh).
         if !target.contains("msvc") {
             if let Some(ar) = builder.ar(target) {
                 cfg.archiver(ar);
             }
             cfg.compiler(builder.cc(target));
         }

         cfg.cargo_metadata(false)
            .out_dir(&dst)
            .target(&target)
            .host(&builder.config.build)
            .opt_level(0)
            .warnings(false)
            .debug(false)
            .file(builder.src.join("src/test/auxiliary/rust_test_helpers.c"))
            .compile("rust_test_helpers");
     }
 }

 const OPENSSL_VERS: &'static str = "1.0.2n";
 const OPENSSL_SHA256: &'static str =
     "370babb75f278c39e0c50e8c4e7493bc0f18db6867478341a832a982fd15a8fe";

 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct Openssl {
     pub target: Interned<String>,
 }

 impl Step for Openssl {
     type Output = ();

     fn should_run(run: ShouldRun) -> ShouldRun {
         run.never()
     }

     fn run(self, builder: &Builder) {
         if builder.config.dry_run {
             return;
         }
         let target = self.target;
         let out = match builder.openssl_dir(target) {
             Some(dir) => dir,
             None => return,
         };

         let stamp = out.join(".stamp");
         let mut contents = String::new();
         drop(File::open(&stamp).and_then(|mut f| f.read_to_string(&mut contents)));
         if contents == OPENSSL_VERS {
             return
         }
         t!(fs::create_dir_all(&out));

         let name = format!("openssl-{}.tar.gz", OPENSSL_VERS);
         let tarball = out.join(&name);
         if !tarball.exists() {
             let tmp = tarball.with_extension("tmp");
             // originally from https://www.openssl.org/source/...
             let url = format!("https://s3-us-west-1.amazonaws.com/rust-lang-ci2/rust-ci-mirror/{}",
                               name);
             let mut last_error = None;
             for _ in 0..3 {
                 let status = Command::new("curl")
                                 .arg("-o").arg(&tmp)
                                 .arg("-f")  // make curl fail if the URL does not return HTTP 200
                                 .arg(&url)
                                 .status()
                                 .expect("failed to spawn curl");

                 // Retry if download failed.
                 if !status.success() {
                     last_error = Some(status.to_string());
                     continue;
                 }

                 // Ensure the hash is correct.
                 let mut shasum = if target.contains("apple") ||
                     builder.config.build.contains("netbsd") {
                     let mut cmd = Command::new("shasum");
                     cmd.arg("-a").arg("256");
                     cmd
                 } else {
                     Command::new("sha256sum")
                 };
                 let output = output(&mut shasum.arg(&tmp));
                 let found = output.split_whitespace().next().unwrap();

                 // If the hash is wrong, probably the download is incomplete or S3 served an error
                 // page. In any case, retry.
                 if found != OPENSSL_SHA256 {
                     last_error = Some(format!(
                         "downloaded openssl sha256 different\n\
                          expected: {}\n\
                          found:    {}\n",
                         OPENSSL_SHA256,
                         found
                     ));
                     continue;
                 }

                 // Everything is fine, so exit the retry loop.
                 last_error = None;
                 break;
             }
             if let Some(error) = last_error {
                 panic!("failed to download openssl source: {}", error);
             }
             t!(fs::rename(&tmp, &tarball));
         }
         let obj = out.join(format!("openssl-{}", OPENSSL_VERS));
         let dst = builder.openssl_install_dir(target).unwrap();
         drop(fs::remove_dir_all(&obj));
         drop(fs::remove_dir_all(&dst));
         builder.run(Command::new("tar").arg("zxf").arg(&tarball).current_dir(&out));

         let mut configure = Command::new("perl");
         configure.arg(obj.join("Configure"));
         configure.arg(format!("--prefix={}", dst.display()));
         configure.arg("no-dso");
         configure.arg("no-ssl2");
         configure.arg("no-ssl3");

         let os = match &*target {
             "aarch64-linux-android" => "linux-aarch64",
             "aarch64-unknown-linux-gnu" => "linux-aarch64",
             "aarch64-unknown-linux-musl" => "linux-aarch64",
             "arm-linux-androideabi" => "android",
             "arm-unknown-linux-gnueabi" => "linux-armv4",
             "arm-unknown-linux-gnueabihf" => "linux-armv4",
             "armv7-linux-androideabi" => "android-armv7",
             "armv7-unknown-linux-gnueabihf" => "linux-armv4",
             "i586-unknown-linux-gnu" => "linux-elf",
             "i586-unknown-linux-musl" => "linux-elf",
             "i686-apple-darwin" => "darwin-i386-cc",
             "i686-linux-android" => "android-x86",
             "i686-unknown-freebsd" => "BSD-x86-elf",
             "i686-unknown-linux-gnu" => "linux-elf",
             "i686-unknown-linux-musl" => "linux-elf",
             "i686-unknown-netbsd" => "BSD-x86-elf",
             "mips-unknown-linux-gnu" => "linux-mips32",
             "mips64-unknown-linux-gnuabi64" => "linux64-mips64",
             "mips64el-unknown-linux-gnuabi64" => "linux64-mips64",
             "mipsel-unknown-linux-gnu" => "linux-mips32",
             "powerpc-unknown-linux-gnu" => "linux-ppc",
             "powerpc-unknown-linux-gnuspe" => "linux-ppc",
             "powerpc-unknown-netbsd" => "BSD-generic32",
             "powerpc64-unknown-linux-gnu" => "linux-ppc64",
             "powerpc64le-unknown-linux-gnu" => "linux-ppc64le",
             "s390x-unknown-linux-gnu" => "linux64-s390x",
             "sparc-unknown-linux-gnu" => "linux-sparcv9",
             "sparc64-unknown-linux-gnu" => "linux64-sparcv9",
             "sparc64-unknown-netbsd" => "BSD-sparc64",
             "x86_64-apple-darwin" => "darwin64-x86_64-cc",
             "x86_64-linux-android" => "linux-x86_64",
             "x86_64-unknown-freebsd" => "BSD-x86_64",
             "x86_64-unknown-dragonfly" => "BSD-x86_64",
             "x86_64-unknown-linux-gnu" => "linux-x86_64",
             "x86_64-unknown-linux-gnux32" => "linux-x32",
             "x86_64-unknown-linux-musl" => "linux-x86_64",
             "x86_64-unknown-netbsd" => "BSD-x86_64",
             _ => panic!("don't know how to configure OpenSSL for {}", target),
         };
         configure.arg(os);
         configure.env("CC", builder.cc(target));
         for flag in builder.cflags(target) {
             configure.arg(flag);
         }
         // There is no specific os target for android aarch64 or x86_64,
         // so we need to pass some extra cflags
         if target == "aarch64-linux-android" || target == "x86_64-linux-android" {
             configure.arg("-mandroid");
             configure.arg("-fomit-frame-pointer");
         }
         if target == "sparc64-unknown-netbsd" {
             // Need -m64 to get assembly generated correctly for sparc64.
             configure.arg("-m64");
             if builder.config.build.contains("netbsd") {
                 // Disable sparc64 asm on NetBSD builders, it uses
                 // m4(1)'s -B flag, which NetBSD m4 does not support.
                 configure.arg("no-asm");
             }
         }
         // Make PIE binaries
         // Non-PIE linker support was removed in Lollipop
         // https://source.android.com/security/enhancements/enhancements50
         if target == "i686-linux-android" {
             configure.arg("no-asm");
         }
         configure.current_dir(&obj);
         builder.info(&format!("Configuring openssl for {}", target));
         builder.run_quiet(&mut configure);
         builder.info(&format!("Building openssl for {}", target));
         builder.run_quiet(Command::new("make").arg("-j1").current_dir(&obj));
         builder.info(&format!("Installing openssl for {}", target));
         builder.run_quiet(Command::new("make").arg("install").arg("-j1").current_dir(&obj));

         let mut f = t!(File::create(&stamp));
         t!(f.write_all(OPENSSL_VERS.as_bytes()));
     }
 }
	// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
	// file at the top-level directory of this distribution and at
	// http://rust-lang.org/COPYRIGHT.
	//
	// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
	// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
	// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
	// option. This file may not be copied, modified, or distributed
	// except according to those terms.

	//! Compilation of native dependencies like LLVM.
	//!
	//! Native projects like LLVM unfortunately aren't suited just yet for
	//! compilation in build scripts that Cargo has. This is because the
	//! compilation takes a very long time but also because we don't want to
	//! compile LLVM 3 times as part of a normal bootstrap (we want it cached).
	//!
	//! LLVM and compiler-rt are essentially just wired up to everything else to
	//! ensure that they're always in place if needed.

	use std::env;
	use std::ffi::OsString;
	use std::fs::{self, File};
	use std::io::{Read, Write};
	use std::path::{Path, PathBuf};
	use std::process::Command;

	use build_helper::output;
	use cmake;
	use cc;

	use util::{self, exe};
	use build_helper::up_to_date;
	use builder::{Builder, RunConfig, ShouldRun, Step};
	use cache::Interned;

	#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
	pub struct Llvm {
	pub target: Interned<String>,
	pub emscripten: bool,
	}

	impl Step for Llvm {
	type Output = PathBuf; // path to llvm-config

	const ONLY_HOSTS: bool = true;

	fn should_run(run: ShouldRun) -> ShouldRun {
	run.path("src/llvm").path("src/llvm-emscripten")
	}

	fn make_run(run: RunConfig) {
	let emscripten = run.path.ends_with("llvm-emscripten");
	run.builder.ensure(Llvm {
	target: run.target,
	emscripten,
	});
	}

	/// Compile LLVM for `target`.
	fn run(self, builder: &Builder) -> PathBuf {
	let target = self.target;
	let emscripten = self.emscripten;

	// If we're using a custom LLVM bail out here, but we can only use a
	// custom LLVM for the build triple.
	if !self.emscripten {
	if let Some(config) = builder.config.target_config.get(&target) {
	if let Some(ref s) = config.llvm_config {
	check_llvm_version(builder, s);
	return s.to_path_buf()
	}
	}
	}

	let rebuild_trigger = builder.src.join("src/rustllvm/llvm-rebuild-trigger");
	let mut rebuild_trigger_contents = String::new();
	t!(t!(File::open(&rebuild_trigger)).read_to_string(&mut rebuild_trigger_contents));

	let (out_dir, llvm_config_ret_dir) = if emscripten {
	let dir = builder.emscripten_llvm_out(target);
	let config_dir = dir.join("bin");
	(dir, config_dir)
	} else {
	let mut dir = builder.llvm_out(builder.config.build);
	if !builder.config.build.contains("msvc") \|\| builder.config.ninja {
	dir.push("build");
	}
	(builder.llvm_out(target), dir.join("bin"))
	};
	let done_stamp = out_dir.join("llvm-finished-building");
	let build_llvm_config = llvm_config_ret_dir
	.join(exe("llvm-config", &*builder.config.build));
	if done_stamp.exists() {
	let mut done_contents = String::new();
	t!(t!(File::open(&done_stamp)).read_to_string(&mut done_contents));

	// If LLVM was already built previously and contents of the rebuild-trigger file
	// didn't change from the previous build, then no action is required.
	if done_contents == rebuild_trigger_contents {
	return build_llvm_config
	}
	}

	let _folder = builder.fold_output(\|\| "llvm");
	let descriptor = if emscripten { "Emscripten " } else { "" };
	builder.info(&format!("Building {}LLVM for {}", descriptor, target));
	let _time = util::timeit(&builder);
	t!(fs::create_dir_all(&out_dir));

	// http://llvm.org/docs/CMake.html
	let root = if self.emscripten { "src/llvm-emscripten" } else { "src/llvm" };
	let mut cfg = cmake::Config::new(builder.src.join(root));

	let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
	(false, _) => "Debug",
	(true, false) => "Release",
	(true, true) => "RelWithDebInfo",
	};

	// NOTE: remember to also update `config.toml.example` when changing the
	// defaults!
	let llvm_targets = if self.emscripten {
	"JSBackend"
	} else {
	match builder.config.llvm_targets {
	Some(ref s) => s,
	None => "X86;ARM;AArch64;Mips;PowerPC;SystemZ;MSP430;Sparc;NVPTX;Hexagon",
	}
	};

	let llvm_exp_targets = if self.emscripten {
	""
	} else {
	&builder.config.llvm_experimental_targets[..]
	};

	let assertions = if builder.config.llvm_assertions {"ON"} else {"OFF"};

	cfg.out_dir(&out_dir)
	.profile(profile)
	.define("LLVM_ENABLE_ASSERTIONS", assertions)
	.define("LLVM_TARGETS_TO_BUILD", llvm_targets)
	.define("LLVM_EXPERIMENTAL_TARGETS_TO_BUILD", llvm_exp_targets)
	.define("LLVM_INCLUDE_EXAMPLES", "OFF")
	.define("LLVM_INCLUDE_TESTS", "OFF")
	.define("LLVM_INCLUDE_DOCS", "OFF")
	.define("LLVM_ENABLE_ZLIB", "OFF")
	.define("WITH_POLLY", "OFF")
	.define("LLVM_ENABLE_TERMINFO", "OFF")
	.define("LLVM_ENABLE_LIBEDIT", "OFF")
	.define("LLVM_ENABLE_LIBXML2", "OFF")
	.define("LLVM_PARALLEL_COMPILE_JOBS", builder.jobs().to_string())
	.define("LLVM_TARGET_ARCH", target.split('-').next().unwrap())
	.define("LLVM_DEFAULT_TARGET_TRIPLE", target);

	// By default, LLVM will automatically find OCaml and, if it finds it,
	// install the LLVM bindings in LLVM_OCAML_INSTALL_PATH, which defaults
	// to /usr/bin/ocaml.
	// This causes problem for non-root builds of Rust. Side-step the issue
	// by setting LLVM_OCAML_INSTALL_PATH to a relative path, so it installs
	// in the prefix.
	cfg.define("LLVM_OCAML_INSTALL_PATH",
	env::var_os("LLVM_OCAML_INSTALL_PATH").unwrap_or_else(\|\| "usr/lib/ocaml".into()));

	// This setting makes the LLVM tools link to the dynamic LLVM library,
	// which saves both memory during parallel links and overall disk space
	// for the tools. We don't distribute any of those tools, so this is
	// just a local concern. However, it doesn't work well everywhere.
	if target.contains("linux-gnu") \|\| target.contains("apple-darwin") {
	cfg.define("LLVM_LINK_LLVM_DYLIB", "ON");
	}

	if target.contains("msvc") {
	cfg.define("LLVM_USE_CRT_DEBUG", "MT");
	cfg.define("LLVM_USE_CRT_RELEASE", "MT");
	cfg.define("LLVM_USE_CRT_RELWITHDEBINFO", "MT");
	cfg.static_crt(true);
	}

	if target.starts_with("i686") {
	cfg.define("LLVM_BUILD_32_BITS", "ON");
	}

	if let Some(num_linkers) = builder.config.llvm_link_jobs {
	if num_linkers > 0 {
	cfg.define("LLVM_PARALLEL_LINK_JOBS", num_linkers.to_string());
	}
	}

	// http://llvm.org/docs/HowToCrossCompileLLVM.html
	if target != builder.config.build && !emscripten {
	builder.ensure(Llvm {
	target: builder.config.build,
	emscripten: false,
	});
	// FIXME: if the llvm root for the build triple is overridden then we
	// should use llvm-tblgen from there, also should verify that it
	// actually exists most of the time in normal installs of LLVM.
	let host = builder.llvm_out(builder.config.build).join("bin/llvm-tblgen");
	cfg.define("CMAKE_CROSSCOMPILING", "True")
	.define("LLVM_TABLEGEN", &host);

	if target.contains("netbsd") {
	cfg.define("CMAKE_SYSTEM_NAME", "NetBSD");
	} else if target.contains("freebsd") {
	cfg.define("CMAKE_SYSTEM_NAME", "FreeBSD");
	}

	cfg.define("LLVM_NATIVE_BUILD", builder.llvm_out(builder.config.build).join("build"));
	}

	configure_cmake(builder, target, &mut cfg, false);

	// FIXME: we don't actually need to build all LLVM tools and all LLVM
	// libraries here, e.g. we just want a few components and a few
	// tools. Figure out how to filter them down and only build the right
	// tools and libs on all platforms.

	if builder.config.dry_run {
	return build_llvm_config;
	}

	cfg.build();

	t!(t!(File::create(&done_stamp)).write_all(rebuild_trigger_contents.as_bytes()));

	build_llvm_config
	}
	}

	fn check_llvm_version(builder: &Builder, llvm_config: &Path) {
	if !builder.config.llvm_version_check {
	return
	}

	if builder.config.dry_run {
	return;
	}

	let mut cmd = Command::new(llvm_config);
	let version = output(cmd.arg("--version"));
	let mut parts = version.split('.').take(2)
	.filter_map(\|s\| s.parse::<u32>().ok());
	if let (Some(major), Some(minor)) = (parts.next(), parts.next()) {
	if major > 3 \|\| (major == 3 && minor >= 9) {
	return
	}
	}
	panic!("\n\nbad LLVM version: {}, need >=3.9\n\n", version)
	}

	fn configure_cmake(builder: &Builder,
	target: Interned<String>,
	cfg: &mut cmake::Config,
	building_dist_binaries: bool) {
	if builder.config.ninja {
	cfg.generator("Ninja");
	}
	cfg.target(&target)
	.host(&builder.config.build);

	let sanitize_cc = \|cc: &Path\| {
	if target.contains("msvc") {
	OsString::from(cc.to_str().unwrap().replace("\\", "/"))
	} else {
	cc.as_os_str().to_owned()
	}
	};

	// MSVC with CMake uses msbuild by default which doesn't respect these
	// vars that we'd otherwise configure. In that case we just skip this
	// entirely.
	if target.contains("msvc") && !builder.config.ninja {
	return
	}

	let cc = builder.cc(target);
	let cxx = builder.cxx(target).unwrap();

	// Handle msvc + ninja + ccache specially (this is what the bots use)
	if target.contains("msvc") &&
	builder.config.ninja &&
	builder.config.ccache.is_some() {
	let mut cc = env::current_exe().expect("failed to get cwd");
	cc.set_file_name("sccache-plus-cl.exe");

	cfg.define("CMAKE_C_COMPILER", sanitize_cc(&cc))
	.define("CMAKE_CXX_COMPILER", sanitize_cc(&cc));
	cfg.env("SCCACHE_PATH",
	builder.config.ccache.as_ref().unwrap())
	.env("SCCACHE_TARGET", target);

	// If ccache is configured we inform the build a little differently hwo
	// to invoke ccache while also invoking our compilers.
	} else if let Some(ref ccache) = builder.config.ccache {
	cfg.define("CMAKE_C_COMPILER", ccache)
	.define("CMAKE_C_COMPILER_ARG1", sanitize_cc(cc))
	.define("CMAKE_CXX_COMPILER", ccache)
	.define("CMAKE_CXX_COMPILER_ARG1", sanitize_cc(cxx));
	} else {
	cfg.define("CMAKE_C_COMPILER", sanitize_cc(cc))
	.define("CMAKE_CXX_COMPILER", sanitize_cc(cxx));
	}

	cfg.build_arg("-j").build_arg(builder.jobs().to_string());
	cfg.define("CMAKE_C_FLAGS", builder.cflags(target).join(" "));
	let mut cxxflags = builder.cflags(target).join(" ");
	if building_dist_binaries {
	if builder.config.llvm_static_stdcpp && !target.contains("windows") {
	cxxflags.push_str(" -static-libstdc++");
	}
	}
	cfg.define("CMAKE_CXX_FLAGS", cxxflags);
	if let Some(ar) = builder.ar(target) {
	if ar.is_absolute() {
	// LLVM build breaks if `CMAKE_AR` is a relative path, for some reason it
	// tries to resolve this path in the LLVM build directory.
	cfg.define("CMAKE_AR", sanitize_cc(ar));
	}
	}

	if env::var_os("SCCACHE_ERROR_LOG").is_some() {
	cfg.env("RUST_LOG", "sccache=warn");
	}
	}

	#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
	pub struct Lld {
	pub target: Interned<String>,
	}

	impl Step for Lld {
	type Output = PathBuf;
	const ONLY_HOSTS: bool = true;

	fn should_run(run: ShouldRun) -> ShouldRun {
	run.path("src/tools/lld")
	}

	fn make_run(run: RunConfig) {
	run.builder.ensure(Lld { target: run.target });
	}

	/// Compile LLVM for `target`.
	fn run(self, builder: &Builder) -> PathBuf {
	if builder.config.dry_run {
	return PathBuf::from("lld-out-dir-test-gen");
	}
	let target = self.target;

	let llvm_config = builder.ensure(Llvm {
	target: self.target,
	emscripten: false,
	});

	let out_dir = builder.lld_out(target);
	let done_stamp = out_dir.join("lld-finished-building");
	if done_stamp.exists() {
	return out_dir
	}

	let _folder = builder.fold_output(\|\| "lld");
	builder.info(&format!("Building LLD for {}", target));
	let _time = util::timeit(&builder);
	t!(fs::create_dir_all(&out_dir));

	let mut cfg = cmake::Config::new(builder.src.join("src/tools/lld"));
	configure_cmake(builder, target, &mut cfg, true);

	cfg.out_dir(&out_dir)
	.profile("Release")
	.define("LLVM_CONFIG_PATH", llvm_config)
	.define("LLVM_INCLUDE_TESTS", "OFF");

	cfg.build();

	t!(File::create(&done_stamp));
	out_dir
	}
	}

	#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
	pub struct TestHelpers {
	pub target: Interned<String>,
	}

	impl Step for TestHelpers {
	type Output = ();

	fn should_run(run: ShouldRun) -> ShouldRun {
	run.path("src/test/auxiliary/rust_test_helpers.c")
	}

	fn make_run(run: RunConfig) {
	run.builder.ensure(TestHelpers { target: run.target })
	}

	/// Compiles the `rust_test_helpers.c` library which we used in various
	/// `run-pass` test suites for ABI testing.
	fn run(self, builder: &Builder) {
	if builder.config.dry_run {
	return;
	}
	let target = self.target;
	let dst = builder.test_helpers_out(target);
	let src = builder.src.join("src/test/auxiliary/rust_test_helpers.c");
	if up_to_date(&src, &dst.join("librust_test_helpers.a")) {
	return
	}

	let _folder = builder.fold_output(\|\| "build_test_helpers");
	builder.info(&format!("Building test helpers"));
	t!(fs::create_dir_all(&dst));
	let mut cfg = cc::Build::new();

	// We may have found various cross-compilers a little differently due to our
	// extra configuration, so inform gcc of these compilers. Note, though, that
	// on MSVC we still need gcc's detection of env vars (ugh).
	if !target.contains("msvc") {
	if let Some(ar) = builder.ar(target) {
	cfg.archiver(ar);
	}
	cfg.compiler(builder.cc(target));
	}

	cfg.cargo_metadata(false)
	.out_dir(&dst)
	.target(&target)
	.host(&builder.config.build)
	.opt_level(0)
	.warnings(false)
	.debug(false)
	.file(builder.src.join("src/test/auxiliary/rust_test_helpers.c"))
	.compile("rust_test_helpers");
	}
	}

	const OPENSSL_VERS: &'static str = "1.0.2n";
	const OPENSSL_SHA256: &'static str =
	"370babb75f278c39e0c50e8c4e7493bc0f18db6867478341a832a982fd15a8fe";

	#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
	pub struct Openssl {
	pub target: Interned<String>,
	}

	impl Step for Openssl {
	type Output = ();

	fn should_run(run: ShouldRun) -> ShouldRun {
	run.never()
	}

	fn run(self, builder: &Builder) {
	if builder.config.dry_run {
	return;
	}
	let target = self.target;
	let out = match builder.openssl_dir(target) {
	Some(dir) => dir,
	None => return,
	};

	let stamp = out.join(".stamp");
	let mut contents = String::new();
	drop(File::open(&stamp).and_then(\|mut f\| f.read_to_string(&mut contents)));
	if contents == OPENSSL_VERS {
	return
	}
	t!(fs::create_dir_all(&out));

	let name = format!("openssl-{}.tar.gz", OPENSSL_VERS);
	let tarball = out.join(&name);
	if !tarball.exists() {
	let tmp = tarball.with_extension("tmp");
	// originally from https://www.openssl.org/source/...
	let url = format!("https://s3-us-west-1.amazonaws.com/rust-lang-ci2/rust-ci-mirror/{}",
	name);
	let mut last_error = None;
	for _ in 0..3 {
	let status = Command::new("curl")
	.arg("-o").arg(&tmp)
	.arg("-f") // make curl fail if the URL does not return HTTP 200
	.arg(&url)
	.status()
	.expect("failed to spawn curl");

	// Retry if download failed.
	if !status.success() {
	last_error = Some(status.to_string());
	continue;
	}

	// Ensure the hash is correct.
	let mut shasum = if target.contains("apple") \|\|
	builder.config.build.contains("netbsd") {
	let mut cmd = Command::new("shasum");
	cmd.arg("-a").arg("256");
	cmd
	} else {
	Command::new("sha256sum")
	};
	let output = output(&mut shasum.arg(&tmp));
	let found = output.split_whitespace().next().unwrap();

	// If the hash is wrong, probably the download is incomplete or S3 served an error
	// page. In any case, retry.
	if found != OPENSSL_SHA256 {
	last_error = Some(format!(
	"downloaded openssl sha256 different\n\
	expected: {}\n\
	found: {}\n",
	OPENSSL_SHA256,
	found
	));
	continue;
	}

	// Everything is fine, so exit the retry loop.
	last_error = None;
	break;
	}
	if let Some(error) = last_error {
	panic!("failed to download openssl source: {}", error);
	}
	t!(fs::rename(&tmp, &tarball));
	}
	let obj = out.join(format!("openssl-{}", OPENSSL_VERS));
	let dst = builder.openssl_install_dir(target).unwrap();
	drop(fs::remove_dir_all(&obj));
	drop(fs::remove_dir_all(&dst));
	builder.run(Command::new("tar").arg("zxf").arg(&tarball).current_dir(&out));

	let mut configure = Command::new("perl");
	configure.arg(obj.join("Configure"));
	configure.arg(format!("--prefix={}", dst.display()));
	configure.arg("no-dso");
	configure.arg("no-ssl2");
	configure.arg("no-ssl3");

	let os = match &*target {
	"aarch64-linux-android" => "linux-aarch64",
	"aarch64-unknown-linux-gnu" => "linux-aarch64",
	"aarch64-unknown-linux-musl" => "linux-aarch64",
	"arm-linux-androideabi" => "android",
	"arm-unknown-linux-gnueabi" => "linux-armv4",
	"arm-unknown-linux-gnueabihf" => "linux-armv4",
	"armv7-linux-androideabi" => "android-armv7",
	"armv7-unknown-linux-gnueabihf" => "linux-armv4",
	"i586-unknown-linux-gnu" => "linux-elf",
	"i586-unknown-linux-musl" => "linux-elf",
	"i686-apple-darwin" => "darwin-i386-cc",
	"i686-linux-android" => "android-x86",
	"i686-unknown-freebsd" => "BSD-x86-elf",
	"i686-unknown-linux-gnu" => "linux-elf",
	"i686-unknown-linux-musl" => "linux-elf",
	"i686-unknown-netbsd" => "BSD-x86-elf",
	"mips-unknown-linux-gnu" => "linux-mips32",
	"mips64-unknown-linux-gnuabi64" => "linux64-mips64",
	"mips64el-unknown-linux-gnuabi64" => "linux64-mips64",
	"mipsel-unknown-linux-gnu" => "linux-mips32",
	"powerpc-unknown-linux-gnu" => "linux-ppc",
	"powerpc-unknown-linux-gnuspe" => "linux-ppc",
	"powerpc-unknown-netbsd" => "BSD-generic32",
	"powerpc64-unknown-linux-gnu" => "linux-ppc64",
	"powerpc64le-unknown-linux-gnu" => "linux-ppc64le",
	"s390x-unknown-linux-gnu" => "linux64-s390x",
	"sparc-unknown-linux-gnu" => "linux-sparcv9",
	"sparc64-unknown-linux-gnu" => "linux64-sparcv9",
	"sparc64-unknown-netbsd" => "BSD-sparc64",
	"x86_64-apple-darwin" => "darwin64-x86_64-cc",
	"x86_64-linux-android" => "linux-x86_64",
	"x86_64-unknown-freebsd" => "BSD-x86_64",
	"x86_64-unknown-dragonfly" => "BSD-x86_64",
	"x86_64-unknown-linux-gnu" => "linux-x86_64",
	"x86_64-unknown-linux-gnux32" => "linux-x32",
	"x86_64-unknown-linux-musl" => "linux-x86_64",
	"x86_64-unknown-netbsd" => "BSD-x86_64",
	_ => panic!("don't know how to configure OpenSSL for {}", target),
	};
	configure.arg(os);
	configure.env("CC", builder.cc(target));
	for flag in builder.cflags(target) {
	configure.arg(flag);
	}
	// There is no specific os target for android aarch64 or x86_64,
	// so we need to pass some extra cflags
	if target == "aarch64-linux-android" \|\| target == "x86_64-linux-android" {
	configure.arg("-mandroid");
	configure.arg("-fomit-frame-pointer");
	}
	if target == "sparc64-unknown-netbsd" {
	// Need -m64 to get assembly generated correctly for sparc64.
	configure.arg("-m64");
	if builder.config.build.contains("netbsd") {
	// Disable sparc64 asm on NetBSD builders, it uses
	// m4(1)'s -B flag, which NetBSD m4 does not support.
	configure.arg("no-asm");
	}
	}
	// Make PIE binaries
	// Non-PIE linker support was removed in Lollipop
	// https://source.android.com/security/enhancements/enhancements50
	if target == "i686-linux-android" {
	configure.arg("no-asm");
	}
	configure.current_dir(&obj);
	builder.info(&format!("Configuring openssl for {}", target));
	builder.run_quiet(&mut configure);
	builder.info(&format!("Building openssl for {}", target));
	builder.run_quiet(Command::new("make").arg("-j1").current_dir(&obj));
	builder.info(&format!("Installing openssl for {}", target));
	builder.run_quiet(Command::new("make").arg("install").arg("-j1").current_dir(&obj));

	let mut f = t!(File::create(&stamp));
	t!(f.write_all(OPENSSL_VERS.as_bytes()));
	}
	}