src/bootstrap/native.rs

   1 //! Compilation of native dependencies like LLVM.
   2 //!
   3 //! Native projects like LLVM unfortunately aren't suited just yet for
   4 //! compilation in build scripts that Cargo has. This is because the
   5 //! compilation takes a *very* long time but also because we don't want to
   6 //! compile LLVM 3 times as part of a normal bootstrap (we want it cached).
   7 //!
   8 //! LLVM and compiler-rt are essentially just wired up to everything else to
   9 //! ensure that they're always in place if needed.
  10
  11 use std::env;
  12 use std::ffi::OsString;
  13 use std::fs::{self, File};
  14 use std::io;
  15 use std::path::{Path, PathBuf};
  16 use std::process::Command;
  17
  18 use build_helper::{output, t};
  19
  20 use crate::builder::{Builder, RunConfig, ShouldRun, Step};
  21 use crate::cache::Interned;
  22 use crate::channel;
  23 use crate::util::{self, exe};
  24 use crate::GitRepo;
  25 use build_helper::up_to_date;
  26
  27 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
  28 pub struct Llvm {
  29     pub target: Interned<String>,
  30 }
  31
  32 impl Step for Llvm {
  33     type Output = PathBuf; // path to llvm-config
  34
  35     const ONLY_HOSTS: bool = true;
  36
  37     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
  38         run.path("src/llvm-project").path("src/llvm-project/llvm").path("src/llvm")
  39     }
  40
  41     fn make_run(run: RunConfig<'_>) {
  42         run.builder.ensure(Llvm { target: run.target });
  43     }
  44
  45     /// Compile LLVM for `target`.
  46     fn run(self, builder: &Builder<'_>) -> PathBuf {
  47         let target = self.target;
  48
  49         // If we're using a custom LLVM bail out here, but we can only use a
  50         // custom LLVM for the build triple.
  51         if let Some(config) = builder.config.target_config.get(&target) {
  52             if let Some(ref s) = config.llvm_config {
  53                 check_llvm_version(builder, s);
  54                 return s.to_path_buf();
  55             }
  56         }
  57
  58         let root = "src/llvm-project/llvm";
  59         let out_dir = builder.llvm_out(target);
  60         let mut llvm_config_ret_dir = builder.llvm_out(builder.config.build);
  61         if !builder.config.build.contains("msvc") || builder.config.ninja {
  62             llvm_config_ret_dir.push("build");
  63         }
  64         llvm_config_ret_dir.push("bin");
  65
  66         let build_llvm_config =
  67             llvm_config_ret_dir.join(exe("llvm-config", &*builder.config.build));
  68
  69         let stamp = out_dir.join("llvm-finished-building");
  70         let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
  71
  72         if builder.config.llvm_skip_rebuild && stamp.path.exists() {
  73             builder.info(
  74                 "Warning: \
  75                 Using a potentially stale build of LLVM; \
  76                 This may not behave well.",
  77             );
  78             return build_llvm_config;
  79         }
  80
  81         if stamp.is_done() {
  82             if stamp.hash.is_none() {
  83                 builder.info(
  84                     "Could not determine the LLVM submodule commit hash. \
  85                      Assuming that an LLVM rebuild is not necessary.",
  86                 );
  87                 builder.info(&format!(
  88                     "To force LLVM to rebuild, remove the file `{}`",
  89                     stamp.path.display()
  90                 ));
  91             }
  92             return build_llvm_config;
  93         }
  94
  95         builder.info(&format!("Building LLVM for {}", target));
  96         t!(stamp.remove());
  97         let _time = util::timeit(&builder);
  98         t!(fs::create_dir_all(&out_dir));
  99
 100         // http://llvm.org/docs/CMake.html
 101         let mut cfg = cmake::Config::new(builder.src.join(root));
 102
 103         let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
 104             (false, _) => "Debug",
 105             (true, false) => "Release",
 106             (true, true) => "RelWithDebInfo",
 107         };
 108
 109         // NOTE: remember to also update `config.toml.example` when changing the
 110         // defaults!
 111         let llvm_targets = match &builder.config.llvm_targets {
 112             Some(s) => s,
 113             None => {
 114                 "AArch64;ARM;Hexagon;MSP430;Mips;NVPTX;PowerPC;RISCV;\
 115                      Sparc;SystemZ;WebAssembly;X86"
 116             }
 117         };
 118
 119         let llvm_exp_targets = match builder.config.llvm_experimental_targets {
 120             Some(ref s) => s,
 121             None => "",
 122         };
 123
 124         let assertions = if builder.config.llvm_assertions { "ON" } else { "OFF" };
 125
 126         cfg.out_dir(&out_dir)
 127             .profile(profile)
 128             .define("LLVM_ENABLE_ASSERTIONS", assertions)
 129             .define("LLVM_TARGETS_TO_BUILD", llvm_targets)
 130             .define("LLVM_EXPERIMENTAL_TARGETS_TO_BUILD", llvm_exp_targets)
 131             .define("LLVM_INCLUDE_EXAMPLES", "OFF")
 132             .define("LLVM_INCLUDE_TESTS", "OFF")
 133             .define("LLVM_INCLUDE_DOCS", "OFF")
 134             .define("LLVM_INCLUDE_BENCHMARKS", "OFF")
 135             .define("LLVM_ENABLE_ZLIB", "OFF")
 136             .define("WITH_POLLY", "OFF")
 137             .define("LLVM_ENABLE_TERMINFO", "OFF")
 138             .define("LLVM_ENABLE_LIBEDIT", "OFF")
 139             .define("LLVM_ENABLE_BINDINGS", "OFF")
 140             .define("LLVM_ENABLE_Z3_SOLVER", "OFF")
 141             .define("LLVM_PARALLEL_COMPILE_JOBS", builder.jobs().to_string())
 142             .define("LLVM_TARGET_ARCH", target.split('-').next().unwrap())
 143             .define("LLVM_DEFAULT_TARGET_TRIPLE", target);
 144
 145         if builder.config.llvm_thin_lto {
 146             cfg.define("LLVM_ENABLE_LTO", "Thin");
 147             if !target.contains("apple") {
 148                 cfg.define("LLVM_ENABLE_LLD", "ON");
 149             }
 150         }
 151
 152         // This setting makes the LLVM tools link to the dynamic LLVM library,
 153         // which saves both memory during parallel links and overall disk space
 154         // for the tools. We don't do this on every platform as it doesn't work
 155         // equally well everywhere.
 156         if builder.llvm_link_tools_dynamically(target) {
 157             cfg.define("LLVM_LINK_LLVM_DYLIB", "ON");
 158         }
 159
 160         // For distribution we want the LLVM tools to be *statically* linked to libstdc++
 161         if builder.config.llvm_tools_enabled || builder.config.lldb_enabled {
 162             if !target.contains("msvc") {
 163                 if target.contains("apple") {
 164                     cfg.define("CMAKE_EXE_LINKER_FLAGS", "-static-libstdc++");
 165                 } else {
 166                     cfg.define("CMAKE_EXE_LINKER_FLAGS", "-Wl,-Bsymbolic -static-libstdc++");
 167                 }
 168             }
 169         }
 170
 171         if target.contains("msvc") {
 172             cfg.define("LLVM_USE_CRT_DEBUG", "MT");
 173             cfg.define("LLVM_USE_CRT_RELEASE", "MT");
 174             cfg.define("LLVM_USE_CRT_RELWITHDEBINFO", "MT");
 175             cfg.static_crt(true);
 176         }
 177
 178         if target.starts_with("i686") {
 179             cfg.define("LLVM_BUILD_32_BITS", "ON");
 180         }
 181
 182         let mut enabled_llvm_projects = Vec::new();
 183
 184         if util::forcing_clang_based_tests() {
 185             enabled_llvm_projects.push("clang");
 186             enabled_llvm_projects.push("compiler-rt");
 187         }
 188
 189         if builder.config.lldb_enabled {
 190             enabled_llvm_projects.push("clang");
 191             enabled_llvm_projects.push("lldb");
 192             // For the time being, disable code signing.
 193             cfg.define("LLDB_CODESIGN_IDENTITY", "");
 194             cfg.define("LLDB_NO_DEBUGSERVER", "ON");
 195         } else {
 196             // LLDB requires libxml2; but otherwise we want it to be disabled.
 197             // See https://github.com/rust-lang/rust/pull/50104
 198             cfg.define("LLVM_ENABLE_LIBXML2", "OFF");
 199         }
 200
 201         if !enabled_llvm_projects.is_empty() {
 202             enabled_llvm_projects.sort();
 203             enabled_llvm_projects.dedup();
 204             cfg.define("LLVM_ENABLE_PROJECTS", enabled_llvm_projects.join(";"));
 205         }
 206
 207         if let Some(num_linkers) = builder.config.llvm_link_jobs {
 208             if num_linkers > 0 {
 209                 cfg.define("LLVM_PARALLEL_LINK_JOBS", num_linkers.to_string());
 210             }
 211         }
 212
 213         // http://llvm.org/docs/HowToCrossCompileLLVM.html
 214         if target != builder.config.build {
 215             builder.ensure(Llvm { target: builder.config.build });
 216             // FIXME: if the llvm root for the build triple is overridden then we
 217             //        should use llvm-tblgen from there, also should verify that it
 218             //        actually exists most of the time in normal installs of LLVM.
 219             let host = builder.llvm_out(builder.config.build).join("bin/llvm-tblgen");
 220             cfg.define("CMAKE_CROSSCOMPILING", "True").define("LLVM_TABLEGEN", &host);
 221
 222             if target.contains("netbsd") {
 223                 cfg.define("CMAKE_SYSTEM_NAME", "NetBSD");
 224             } else if target.contains("freebsd") {
 225                 cfg.define("CMAKE_SYSTEM_NAME", "FreeBSD");
 226             } else if target.contains("windows") {
 227                 cfg.define("CMAKE_SYSTEM_NAME", "Windows");
 228             }
 229
 230             cfg.define("LLVM_NATIVE_BUILD", builder.llvm_out(builder.config.build).join("build"));
 231         }
 232
 233         if let Some(ref suffix) = builder.config.llvm_version_suffix {
 234             // Allow version-suffix="" to not define a version suffix at all.
 235             if !suffix.is_empty() {
 236                 cfg.define("LLVM_VERSION_SUFFIX", suffix);
 237             }
 238         } else if builder.config.channel == "dev" {
 239             // Changes to a version suffix require a complete rebuild of the LLVM.
 240             // To avoid rebuilds during a time of version bump, don't include rustc
 241             // release number on the dev channel.
 242             cfg.define("LLVM_VERSION_SUFFIX", "-rust-dev");
 243         } else {
 244             let suffix = format!("-rust-{}-{}", channel::CFG_RELEASE_NUM, builder.config.channel);
 245             cfg.define("LLVM_VERSION_SUFFIX", suffix);
 246         }
 247
 248         if let Some(ref linker) = builder.config.llvm_use_linker {
 249             cfg.define("LLVM_USE_LINKER", linker);
 250         }
 251
 252         if let Some(true) = builder.config.llvm_allow_old_toolchain {
 253             cfg.define("LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN", "YES");
 254         }
 255
 256         if let Some(ref python) = builder.config.python {
 257             cfg.define("PYTHON_EXECUTABLE", python);
 258         }
 259
 260         configure_cmake(builder, target, &mut cfg, true);
 261
 262         // FIXME: we don't actually need to build all LLVM tools and all LLVM
 263         //        libraries here, e.g., we just want a few components and a few
 264         //        tools. Figure out how to filter them down and only build the right
 265         //        tools and libs on all platforms.
 266
 267         if builder.config.dry_run {
 268             return build_llvm_config;
 269         }
 270
 271         cfg.build();
 272
 273         t!(stamp.write());
 274
 275         build_llvm_config
 276     }
 277 }
 278
 279 fn check_llvm_version(builder: &Builder<'_>, llvm_config: &Path) {
 280     if !builder.config.llvm_version_check {
 281         return;
 282     }
 283
 284     if builder.config.dry_run {
 285         return;
 286     }
 287
 288     let mut cmd = Command::new(llvm_config);
 289     let version = output(cmd.arg("--version"));
 290     let mut parts = version.split('.').take(2).filter_map(|s| s.parse::<u32>().ok());
 291     if let (Some(major), Some(_minor)) = (parts.next(), parts.next()) {
 292         if major >= 8 {
 293             return;
 294         }
 295     }
 296     panic!("\n\nbad LLVM version: {}, need >=8.0\n\n", version)
 297 }
 298
 299 fn configure_cmake(
 300     builder: &Builder<'_>,
 301     target: Interned<String>,
 302     cfg: &mut cmake::Config,
 303     use_compiler_launcher: bool,
 304 ) {
 305     // Do not print installation messages for up-to-date files.
 306     // LLVM and LLD builds can produce a lot of those and hit CI limits on log size.
 307     cfg.define("CMAKE_INSTALL_MESSAGE", "LAZY");
 308
 309     if builder.config.ninja {
 310         cfg.generator("Ninja");
 311     }
 312     cfg.target(&target).host(&builder.config.build);
 313
 314     let sanitize_cc = |cc: &Path| {
 315         if target.contains("msvc") {
 316             OsString::from(cc.to_str().unwrap().replace("\\", "/"))
 317         } else {
 318             cc.as_os_str().to_owned()
 319         }
 320     };
 321
 322     // MSVC with CMake uses msbuild by default which doesn't respect these
 323     // vars that we'd otherwise configure. In that case we just skip this
 324     // entirely.
 325     if target.contains("msvc") && !builder.config.ninja {
 326         return;
 327     }
 328
 329     let (cc, cxx) = match builder.config.llvm_clang_cl {
 330         Some(ref cl) => (cl.as_ref(), cl.as_ref()),
 331         None => (builder.cc(target), builder.cxx(target).unwrap()),
 332     };
 333
 334     // Handle msvc + ninja + ccache specially (this is what the bots use)
 335     if target.contains("msvc") && builder.config.ninja && builder.config.ccache.is_some() {
 336         let mut wrap_cc = env::current_exe().expect("failed to get cwd");
 337         wrap_cc.set_file_name("sccache-plus-cl.exe");
 338
 339         cfg.define("CMAKE_C_COMPILER", sanitize_cc(&wrap_cc))
 340             .define("CMAKE_CXX_COMPILER", sanitize_cc(&wrap_cc));
 341         cfg.env("SCCACHE_PATH", builder.config.ccache.as_ref().unwrap())
 342             .env("SCCACHE_TARGET", target)
 343             .env("SCCACHE_CC", &cc)
 344             .env("SCCACHE_CXX", &cxx);
 345
 346         // Building LLVM on MSVC can be a little ludicrous at times. We're so far
 347         // off the beaten path here that I'm not really sure this is even half
 348         // supported any more. Here we're trying to:
 349         //
 350         // * Build LLVM on MSVC
 351         // * Build LLVM with `clang-cl` instead of `cl.exe`
 352         // * Build a project with `sccache`
 353         // * Build for 32-bit as well
 354         // * Build with Ninja
 355         //
 356         // For `cl.exe` there are different binaries to compile 32/64 bit which
 357         // we use but for `clang-cl` there's only one which internally
 358         // multiplexes via flags. As a result it appears that CMake's detection
 359         // of a compiler's architecture and such on MSVC **doesn't** pass any
 360         // custom flags we pass in CMAKE_CXX_FLAGS below. This means that if we
 361         // use `clang-cl.exe` it's always diagnosed as a 64-bit compiler which
 362         // definitely causes problems since all the env vars are pointing to
 363         // 32-bit libraries.
 364         //
 365         // To hack around this... again... we pass an argument that's
 366         // unconditionally passed in the sccache shim. This'll get CMake to
 367         // correctly diagnose it's doing a 32-bit compilation and LLVM will
 368         // internally configure itself appropriately.
 369         if builder.config.llvm_clang_cl.is_some() && target.contains("i686") {
 370             cfg.env("SCCACHE_EXTRA_ARGS", "-m32");
 371         }
 372     } else {
 373         // If ccache is configured we inform the build a little differently how
 374         // to invoke ccache while also invoking our compilers.
 375         if use_compiler_launcher {
 376             if let Some(ref ccache) = builder.config.ccache {
 377                 cfg.define("CMAKE_C_COMPILER_LAUNCHER", ccache)
 378                     .define("CMAKE_CXX_COMPILER_LAUNCHER", ccache);
 379             }
 380         }
 381         cfg.define("CMAKE_C_COMPILER", sanitize_cc(cc))
 382             .define("CMAKE_CXX_COMPILER", sanitize_cc(cxx));
 383     }
 384
 385     cfg.build_arg("-j").build_arg(builder.jobs().to_string());
 386     let mut cflags = builder.cflags(target, GitRepo::Llvm).join(" ");
 387     if let Some(ref s) = builder.config.llvm_cflags {
 388         cflags.push_str(&format!(" {}", s));
 389     }
 390     cfg.define("CMAKE_C_FLAGS", cflags);
 391     let mut cxxflags = builder.cflags(target, GitRepo::Llvm).join(" ");
 392     if builder.config.llvm_static_stdcpp && !target.contains("msvc") && !target.contains("netbsd") {
 393         cxxflags.push_str(" -static-libstdc++");
 394     }
 395     if let Some(ref s) = builder.config.llvm_cxxflags {
 396         cxxflags.push_str(&format!(" {}", s));
 397     }
 398     cfg.define("CMAKE_CXX_FLAGS", cxxflags);
 399     if let Some(ar) = builder.ar(target) {
 400         if ar.is_absolute() {
 401             // LLVM build breaks if `CMAKE_AR` is a relative path, for some reason it
 402             // tries to resolve this path in the LLVM build directory.
 403             cfg.define("CMAKE_AR", sanitize_cc(ar));
 404         }
 405     }
 406
 407     if let Some(ranlib) = builder.ranlib(target) {
 408         if ranlib.is_absolute() {
 409             // LLVM build breaks if `CMAKE_RANLIB` is a relative path, for some reason it
 410             // tries to resolve this path in the LLVM build directory.
 411             cfg.define("CMAKE_RANLIB", sanitize_cc(ranlib));
 412         }
 413     }
 414
 415     if let Some(ref s) = builder.config.llvm_ldflags {
 416         cfg.define("CMAKE_SHARED_LINKER_FLAGS", s);
 417         cfg.define("CMAKE_MODULE_LINKER_FLAGS", s);
 418         cfg.define("CMAKE_EXE_LINKER_FLAGS", s);
 419     }
 420
 421     if env::var_os("SCCACHE_ERROR_LOG").is_some() {
 422         cfg.env("RUSTC_LOG", "sccache=warn");
 423     }
 424 }
 425
 426 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 427 pub struct Lld {
 428     pub target: Interned<String>,
 429 }
 430
 431 impl Step for Lld {
 432     type Output = PathBuf;
 433     const ONLY_HOSTS: bool = true;
 434
 435     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 436         run.path("src/llvm-project/lld").path("src/tools/lld")
 437     }
 438
 439     fn make_run(run: RunConfig<'_>) {
 440         run.builder.ensure(Lld { target: run.target });
 441     }
 442
 443     /// Compile LLVM for `target`.
 444     fn run(self, builder: &Builder<'_>) -> PathBuf {
 445         if builder.config.dry_run {
 446             return PathBuf::from("lld-out-dir-test-gen");
 447         }
 448         let target = self.target;
 449
 450         let llvm_config = builder.ensure(Llvm { target: self.target });
 451
 452         let out_dir = builder.lld_out(target);
 453         let done_stamp = out_dir.join("lld-finished-building");
 454         if done_stamp.exists() {
 455             return out_dir;
 456         }
 457
 458         builder.info(&format!("Building LLD for {}", target));
 459         let _time = util::timeit(&builder);
 460         t!(fs::create_dir_all(&out_dir));
 461
 462         let mut cfg = cmake::Config::new(builder.src.join("src/llvm-project/lld"));
 463         configure_cmake(builder, target, &mut cfg, true);
 464
 465         // This is an awful, awful hack. Discovered when we migrated to using
 466         // clang-cl to compile LLVM/LLD it turns out that LLD, when built out of
 467         // tree, will execute `llvm-config --cmakedir` and then tell CMake about
 468         // that directory for later processing. Unfortunately if this path has
 469         // forward slashes in it (which it basically always does on Windows)
 470         // then CMake will hit a syntax error later on as... something isn't
 471         // escaped it seems?
 472         //
 473         // Instead of attempting to fix this problem in upstream CMake and/or
 474         // LLVM/LLD we just hack around it here. This thin wrapper will take the
 475         // output from llvm-config and replace all instances of `\` with `/` to
 476         // ensure we don't hit the same bugs with escaping. It means that you
 477         // can't build on a system where your paths require `\` on Windows, but
 478         // there's probably a lot of reasons you can't do that other than this.
 479         let llvm_config_shim = env::current_exe().unwrap().with_file_name("llvm-config-wrapper");
 480         cfg.out_dir(&out_dir)
 481             .profile("Release")
 482             .env("LLVM_CONFIG_REAL", llvm_config)
 483             .define("LLVM_CONFIG_PATH", llvm_config_shim)
 484             .define("LLVM_INCLUDE_TESTS", "OFF");
 485
 486         cfg.build();
 487
 488         t!(File::create(&done_stamp));
 489         out_dir
 490     }
 491 }
 492
 493 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 494 pub struct TestHelpers {
 495     pub target: Interned<String>,
 496 }
 497
 498 impl Step for TestHelpers {
 499     type Output = ();
 500
 501     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 502         run.path("src/test/auxiliary/rust_test_helpers.c")
 503     }
 504
 505     fn make_run(run: RunConfig<'_>) {
 506         run.builder.ensure(TestHelpers { target: run.target })
 507     }
 508
 509     /// Compiles the `rust_test_helpers.c` library which we used in various
 510     /// `run-pass` tests for ABI testing.
 511     fn run(self, builder: &Builder<'_>) {
 512         if builder.config.dry_run {
 513             return;
 514         }
 515         let target = self.target;
 516         let dst = builder.test_helpers_out(target);
 517         let src = builder.src.join("src/test/auxiliary/rust_test_helpers.c");
 518         if up_to_date(&src, &dst.join("librust_test_helpers.a")) {
 519             return;
 520         }
 521
 522         builder.info("Building test helpers");
 523         t!(fs::create_dir_all(&dst));
 524         let mut cfg = cc::Build::new();
 525         // FIXME: Workaround for https://github.com/emscripten-core/emscripten/issues/9013
 526         if target.contains("emscripten") {
 527             cfg.pic(false);
 528         }
 529
 530         // We may have found various cross-compilers a little differently due to our
 531         // extra configuration, so inform gcc of these compilers. Note, though, that
 532         // on MSVC we still need gcc's detection of env vars (ugh).
 533         if !target.contains("msvc") {
 534             if let Some(ar) = builder.ar(target) {
 535                 cfg.archiver(ar);
 536             }
 537             cfg.compiler(builder.cc(target));
 538         }
 539
 540         cfg.cargo_metadata(false)
 541             .out_dir(&dst)
 542             .target(&target)
 543             .host(&builder.config.build)
 544             .opt_level(0)
 545             .warnings(false)
 546             .debug(false)
 547             .file(builder.src.join("src/test/auxiliary/rust_test_helpers.c"))
 548             .compile("rust_test_helpers");
 549     }
 550 }
 551
 552 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 553 pub struct Sanitizers {
 554     pub target: Interned<String>,
 555 }
 556
 557 impl Step for Sanitizers {
 558     type Output = Vec<SanitizerRuntime>;
 559
 560     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 561         run.path("src/llvm-project/compiler-rt").path("src/sanitizers")
 562     }
 563
 564     fn make_run(run: RunConfig<'_>) {
 565         run.builder.ensure(Sanitizers { target: run.target });
 566     }
 567
 568     /// Builds sanitizer runtime libraries.
 569     fn run(self, builder: &Builder<'_>) -> Self::Output {
 570         let compiler_rt_dir = builder.src.join("src/llvm-project/compiler-rt");
 571         if !compiler_rt_dir.exists() {
 572             return Vec::new();
 573         }
 574
 575         let out_dir = builder.native_dir(self.target).join("sanitizers");
 576         let runtimes = supported_sanitizers(&out_dir, self.target, &builder.config.channel);
 577         if runtimes.is_empty() {
 578             return runtimes;
 579         }
 580
 581         let llvm_config = builder.ensure(Llvm { target: builder.config.build });
 582         if builder.config.dry_run {
 583             return runtimes;
 584         }
 585
 586         let stamp = out_dir.join("sanitizers-finished-building");
 587         let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
 588
 589         if stamp.is_done() {
 590             if stamp.hash.is_none() {
 591                 builder.info(&format!(
 592                     "Rebuild sanitizers by removing the file `{}`",
 593                     stamp.path.display()
 594                 ));
 595             }
 596             return runtimes;
 597         }
 598
 599         builder.info(&format!("Building sanitizers for {}", self.target));
 600         t!(stamp.remove());
 601         let _time = util::timeit(&builder);
 602
 603         let mut cfg = cmake::Config::new(&compiler_rt_dir);
 604         cfg.profile("Release");
 605         cfg.define("CMAKE_C_COMPILER_TARGET", self.target);
 606         cfg.define("COMPILER_RT_BUILD_BUILTINS", "OFF");
 607         cfg.define("COMPILER_RT_BUILD_CRT", "OFF");
 608         cfg.define("COMPILER_RT_BUILD_LIBFUZZER", "OFF");
 609         cfg.define("COMPILER_RT_BUILD_PROFILE", "OFF");
 610         cfg.define("COMPILER_RT_BUILD_SANITIZERS", "ON");
 611         cfg.define("COMPILER_RT_BUILD_XRAY", "OFF");
 612         cfg.define("COMPILER_RT_DEFAULT_TARGET_ONLY", "ON");
 613         cfg.define("COMPILER_RT_USE_LIBCXX", "OFF");
 614         cfg.define("LLVM_CONFIG_PATH", &llvm_config);
 615
 616         // On Darwin targets the sanitizer runtimes are build as universal binaries.
 617         // Unfortunately sccache currently lacks support to build them successfully.
 618         // Disable compiler launcher on Darwin targets to avoid potential issues.
 619         let use_compiler_launcher = !self.target.contains("apple-darwin");
 620         configure_cmake(builder, self.target, &mut cfg, use_compiler_launcher);
 621
 622         t!(fs::create_dir_all(&out_dir));
 623         cfg.out_dir(out_dir);
 624
 625         for runtime in &runtimes {
 626             cfg.build_target(&runtime.cmake_target);
 627             cfg.build();
 628         }
 629         t!(stamp.write());
 630
 631         runtimes
 632     }
 633 }
 634
 635 #[derive(Clone, Debug)]
 636 pub struct SanitizerRuntime {
 637     /// CMake target used to build the runtime.
 638     pub cmake_target: String,
 639     /// Path to the built runtime library.
 640     pub path: PathBuf,
 641     /// Library filename that will be used rustc.
 642     pub name: String,
 643 }
 644
 645 /// Returns sanitizers available on a given target.
 646 fn supported_sanitizers(
 647     out_dir: &Path,
 648     target: Interned<String>,
 649     channel: &str,
 650 ) -> Vec<SanitizerRuntime> {
 651     let mut result = Vec::new();
 652     match &*target {
 653         "x86_64-apple-darwin" => {
 654             for s in &["asan", "lsan", "tsan"] {
 655                 result.push(SanitizerRuntime {
 656                     cmake_target: format!("clang_rt.{}_osx_dynamic", s),
 657                     path: out_dir
 658                         .join(&format!("build/lib/darwin/libclang_rt.{}_osx_dynamic.dylib", s)),
 659                     name: format!("librustc-{}_rt.{}.dylib", channel, s),
 660                 });
 661             }
 662         }
 663         "x86_64-unknown-linux-gnu" => {
 664             for s in &["asan", "lsan", "msan", "tsan"] {
 665                 result.push(SanitizerRuntime {
 666                     cmake_target: format!("clang_rt.{}-x86_64", s),
 667                     path: out_dir.join(&format!("build/lib/linux/libclang_rt.{}-x86_64.a", s)),
 668                     name: format!("librustc-{}_rt.{}.a", channel, s),
 669                 });
 670             }
 671         }
 672         "x86_64-fuchsia" => {
 673             for s in &["asan"] {
 674                 result.push(SanitizerRuntime {
 675                     cmake_target: format!("clang_rt.{}-x86_64", s),
 676                     path: out_dir.join(&format!("build/lib/fuchsia/libclang_rt.{}-x86_64.a", s)),
 677                     name: format!("librustc-{}_rt.{}.a", channel, s),
 678                 });
 679             }
 680         }
 681         "aarch64-fuchsia" => {
 682             for s in &["asan"] {
 683                 result.push(SanitizerRuntime {
 684                     cmake_target: format!("clang_rt.{}-aarch64", s),
 685                     path: out_dir.join(&format!("build/lib/fuchsia/libclang_rt.{}-aarch64.a", s)),
 686                     name: format!("librustc-{}_rt.{}.a", channel, s),
 687                 });
 688             }
 689         }
 690         _ => {}
 691     }
 692     result
 693 }
 694
 695 struct HashStamp {
 696     path: PathBuf,
 697     hash: Option<Vec<u8>>,
 698 }
 699
 700 impl HashStamp {
 701     fn new(path: PathBuf, hash: Option<&str>) -> Self {
 702         HashStamp { path, hash: hash.map(|s| s.as_bytes().to_owned()) }
 703     }
 704
 705     fn is_done(&self) -> bool {
 706         match fs::read(&self.path) {
 707             Ok(h) => self.hash.as_deref().unwrap_or(b"") == h.as_slice(),
 708             Err(e) if e.kind() == io::ErrorKind::NotFound => false,
 709             Err(e) => {
 710                 panic!("failed to read stamp file `{}`: {}", self.path.display(), e);
 711             }
 712         }
 713     }
 714
 715     fn remove(&self) -> io::Result<()> {
 716         match fs::remove_file(&self.path) {
 717             Ok(()) => Ok(()),
 718             Err(e) => {
 719                 if e.kind() == io::ErrorKind::NotFound {
 720                     Ok(())
 721                 } else {
 722                     Err(e)
 723                 }
 724             }
 725         }
 726     }
 727
 728     fn write(&self) -> io::Result<()> {
 729         fs::write(&self.path, self.hash.as_deref().unwrap_or(b""))
 730     }
 731 }