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::path::{Path, PathBuf};
  15 use std::process::Command;
  16
  17 use build_helper::{output, t};
  18
  19 use crate::builder::{Builder, RunConfig, ShouldRun, Step};
  20 use crate::cache::Interned;
  21 use crate::channel;
  22 use crate::util::{self, exe};
  23 use crate::GitRepo;
  24 use build_helper::up_to_date;
  25
  26 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
  27 pub struct Llvm {
  28     pub target: Interned<String>,
  29 }
  30
  31 impl Step for Llvm {
  32     type Output = PathBuf; // path to llvm-config
  33
  34     const ONLY_HOSTS: bool = true;
  35
  36     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
  37         run.path("src/llvm-project").path("src/llvm-project/llvm").path("src/llvm")
  38     }
  39
  40     fn make_run(run: RunConfig<'_>) {
  41         run.builder.ensure(Llvm { target: run.target });
  42     }
  43
  44     /// Compile LLVM for `target`.
  45     fn run(self, builder: &Builder<'_>) -> PathBuf {
  46         let target = self.target;
  47
  48         // If we're using a custom LLVM bail out here, but we can only use a
  49         // custom LLVM for the build triple.
  50         if let Some(config) = builder.config.target_config.get(&target) {
  51             if let Some(ref s) = config.llvm_config {
  52                 check_llvm_version(builder, s);
  53                 return s.to_path_buf();
  54             }
  55         }
  56
  57         let llvm_info = &builder.in_tree_llvm_info;
  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         let done_stamp = out_dir.join("llvm-finished-building");
  69
  70         if done_stamp.exists() {
  71             if builder.config.llvm_skip_rebuild {
  72                 builder.info(
  73                     "Warning: \
  74                     Using a potentially stale build of LLVM; \
  75                     This may not behave well.",
  76                 );
  77                 return build_llvm_config;
  78             }
  79
  80             if let Some(llvm_commit) = llvm_info.sha() {
  81                 let done_contents = t!(fs::read(&done_stamp));
  82
  83                 // If LLVM was already built previously and the submodule's commit didn't change
  84                 // from the previous build, then no action is required.
  85                 if done_contents == llvm_commit.as_bytes() {
  86                     return build_llvm_config;
  87                 }
  88             } else {
  89                 builder.info(
  90                     "Could not determine the LLVM submodule commit hash. \
  91                      Assuming that an LLVM rebuild is not necessary.",
  92                 );
  93                 builder.info(&format!(
  94                     "To force LLVM to rebuild, remove the file `{}`",
  95                     done_stamp.display()
  96                 ));
  97                 return build_llvm_config;
  98             }
  99         }
 100
 101         builder.info(&format!("Building LLVM for {}", target));
 102         let _time = util::timeit(&builder);
 103         t!(fs::create_dir_all(&out_dir));
 104
 105         // http://llvm.org/docs/CMake.html
 106         let mut cfg = cmake::Config::new(builder.src.join(root));
 107
 108         let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
 109             (false, _) => "Debug",
 110             (true, false) => "Release",
 111             (true, true) => "RelWithDebInfo",
 112         };
 113
 114         // NOTE: remember to also update `config.toml.example` when changing the
 115         // defaults!
 116         let llvm_targets = match &builder.config.llvm_targets {
 117             Some(s) => s,
 118             None => {
 119                 "AArch64;ARM;Hexagon;MSP430;Mips;NVPTX;PowerPC;RISCV;\
 120                      Sparc;SystemZ;WebAssembly;X86"
 121             }
 122         };
 123
 124         let llvm_exp_targets = match builder.config.llvm_experimental_targets {
 125             Some(ref s) => s,
 126             None => "",
 127         };
 128
 129         let assertions = if builder.config.llvm_assertions { "ON" } else { "OFF" };
 130
 131         cfg.out_dir(&out_dir)
 132             .profile(profile)
 133             .define("LLVM_ENABLE_ASSERTIONS", assertions)
 134             .define("LLVM_TARGETS_TO_BUILD", llvm_targets)
 135             .define("LLVM_EXPERIMENTAL_TARGETS_TO_BUILD", llvm_exp_targets)
 136             .define("LLVM_INCLUDE_EXAMPLES", "OFF")
 137             .define("LLVM_INCLUDE_TESTS", "OFF")
 138             .define("LLVM_INCLUDE_DOCS", "OFF")
 139             .define("LLVM_INCLUDE_BENCHMARKS", "OFF")
 140             .define("LLVM_ENABLE_ZLIB", "OFF")
 141             .define("WITH_POLLY", "OFF")
 142             .define("LLVM_ENABLE_TERMINFO", "OFF")
 143             .define("LLVM_ENABLE_LIBEDIT", "OFF")
 144             .define("LLVM_ENABLE_BINDINGS", "OFF")
 145             .define("LLVM_ENABLE_Z3_SOLVER", "OFF")
 146             .define("LLVM_PARALLEL_COMPILE_JOBS", builder.jobs().to_string())
 147             .define("LLVM_TARGET_ARCH", target.split('-').next().unwrap())
 148             .define("LLVM_DEFAULT_TARGET_TRIPLE", target);
 149
 150         if builder.config.llvm_thin_lto {
 151             cfg.define("LLVM_ENABLE_LTO", "Thin");
 152             if !target.contains("apple") {
 153                 cfg.define("LLVM_ENABLE_LLD", "ON");
 154             }
 155         }
 156
 157         // This setting makes the LLVM tools link to the dynamic LLVM library,
 158         // which saves both memory during parallel links and overall disk space
 159         // for the tools. We don't do this on every platform as it doesn't work
 160         // equally well everywhere.
 161         if builder.llvm_link_tools_dynamically(target) {
 162             cfg.define("LLVM_LINK_LLVM_DYLIB", "ON");
 163         }
 164
 165         // For distribution we want the LLVM tools to be *statically* linked to libstdc++
 166         if builder.config.llvm_tools_enabled || builder.config.lldb_enabled {
 167             if !target.contains("msvc") {
 168                 if target.contains("apple") {
 169                     cfg.define("CMAKE_EXE_LINKER_FLAGS", "-static-libstdc++");
 170                 } else {
 171                     cfg.define("CMAKE_EXE_LINKER_FLAGS", "-Wl,-Bsymbolic -static-libstdc++");
 172                 }
 173             }
 174         }
 175
 176         if target.contains("msvc") {
 177             cfg.define("LLVM_USE_CRT_DEBUG", "MT");
 178             cfg.define("LLVM_USE_CRT_RELEASE", "MT");
 179             cfg.define("LLVM_USE_CRT_RELWITHDEBINFO", "MT");
 180             cfg.static_crt(true);
 181         }
 182
 183         if target.starts_with("i686") {
 184             cfg.define("LLVM_BUILD_32_BITS", "ON");
 185         }
 186
 187         let mut enabled_llvm_projects = Vec::new();
 188
 189         if util::forcing_clang_based_tests() {
 190             enabled_llvm_projects.push("clang");
 191             enabled_llvm_projects.push("compiler-rt");
 192         }
 193
 194         if builder.config.lldb_enabled {
 195             enabled_llvm_projects.push("clang");
 196             enabled_llvm_projects.push("lldb");
 197             // For the time being, disable code signing.
 198             cfg.define("LLDB_CODESIGN_IDENTITY", "");
 199             cfg.define("LLDB_NO_DEBUGSERVER", "ON");
 200         } else {
 201             // LLDB requires libxml2; but otherwise we want it to be disabled.
 202             // See https://github.com/rust-lang/rust/pull/50104
 203             cfg.define("LLVM_ENABLE_LIBXML2", "OFF");
 204         }
 205
 206         if !enabled_llvm_projects.is_empty() {
 207             enabled_llvm_projects.sort();
 208             enabled_llvm_projects.dedup();
 209             cfg.define("LLVM_ENABLE_PROJECTS", enabled_llvm_projects.join(";"));
 210         }
 211
 212         if let Some(num_linkers) = builder.config.llvm_link_jobs {
 213             if num_linkers > 0 {
 214                 cfg.define("LLVM_PARALLEL_LINK_JOBS", num_linkers.to_string());
 215             }
 216         }
 217
 218         // http://llvm.org/docs/HowToCrossCompileLLVM.html
 219         if target != builder.config.build {
 220             builder.ensure(Llvm { target: builder.config.build });
 221             // FIXME: if the llvm root for the build triple is overridden then we
 222             //        should use llvm-tblgen from there, also should verify that it
 223             //        actually exists most of the time in normal installs of LLVM.
 224             let host = builder.llvm_out(builder.config.build).join("bin/llvm-tblgen");
 225             cfg.define("CMAKE_CROSSCOMPILING", "True").define("LLVM_TABLEGEN", &host);
 226
 227             if target.contains("netbsd") {
 228                 cfg.define("CMAKE_SYSTEM_NAME", "NetBSD");
 229             } else if target.contains("freebsd") {
 230                 cfg.define("CMAKE_SYSTEM_NAME", "FreeBSD");
 231             } else if target.contains("windows") {
 232                 cfg.define("CMAKE_SYSTEM_NAME", "Windows");
 233             }
 234
 235             cfg.define("LLVM_NATIVE_BUILD", builder.llvm_out(builder.config.build).join("build"));
 236         }
 237
 238         if let Some(ref suffix) = builder.config.llvm_version_suffix {
 239             // Allow version-suffix="" to not define a version suffix at all.
 240             if !suffix.is_empty() {
 241                 cfg.define("LLVM_VERSION_SUFFIX", suffix);
 242             }
 243         } else {
 244             let mut default_suffix =
 245                 format!("-rust-{}-{}", channel::CFG_RELEASE_NUM, builder.config.channel,);
 246             if let Some(sha) = llvm_info.sha_short() {
 247                 default_suffix.push_str("-");
 248                 default_suffix.push_str(sha);
 249             }
 250             cfg.define("LLVM_VERSION_SUFFIX", default_suffix);
 251         }
 252
 253         if let Some(ref linker) = builder.config.llvm_use_linker {
 254             cfg.define("LLVM_USE_LINKER", linker);
 255         }
 256
 257         if let Some(true) = builder.config.llvm_allow_old_toolchain {
 258             cfg.define("LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN", "YES");
 259         }
 260
 261         if let Some(ref python) = builder.config.python {
 262             cfg.define("PYTHON_EXECUTABLE", python);
 263         }
 264
 265         configure_cmake(builder, target, &mut cfg, true);
 266
 267         // FIXME: we don't actually need to build all LLVM tools and all LLVM
 268         //        libraries here, e.g., we just want a few components and a few
 269         //        tools. Figure out how to filter them down and only build the right
 270         //        tools and libs on all platforms.
 271
 272         if builder.config.dry_run {
 273             return build_llvm_config;
 274         }
 275
 276         cfg.build();
 277
 278         t!(fs::write(&done_stamp, llvm_info.sha().unwrap_or("")));
 279
 280         build_llvm_config
 281     }
 282 }
 283
 284 fn check_llvm_version(builder: &Builder<'_>, llvm_config: &Path) {
 285     if !builder.config.llvm_version_check {
 286         return;
 287     }
 288
 289     if builder.config.dry_run {
 290         return;
 291     }
 292
 293     let mut cmd = Command::new(llvm_config);
 294     let version = output(cmd.arg("--version"));
 295     let mut parts = version.split('.').take(2).filter_map(|s| s.parse::<u32>().ok());
 296     if let (Some(major), Some(_minor)) = (parts.next(), parts.next()) {
 297         if major >= 7 {
 298             return;
 299         }
 300     }
 301     panic!("\n\nbad LLVM version: {}, need >=7.0\n\n", version)
 302 }
 303
 304 fn configure_cmake(
 305     builder: &Builder<'_>,
 306     target: Interned<String>,
 307     cfg: &mut cmake::Config,
 308     use_compiler_launcher: bool,
 309 ) {
 310     // Do not print installation messages for up-to-date files.
 311     // LLVM and LLD builds can produce a lot of those and hit CI limits on log size.
 312     cfg.define("CMAKE_INSTALL_MESSAGE", "LAZY");
 313
 314     if builder.config.ninja {
 315         cfg.generator("Ninja");
 316     }
 317     cfg.target(&target).host(&builder.config.build);
 318
 319     let sanitize_cc = |cc: &Path| {
 320         if target.contains("msvc") {
 321             OsString::from(cc.to_str().unwrap().replace("\\", "/"))
 322         } else {
 323             cc.as_os_str().to_owned()
 324         }
 325     };
 326
 327     // MSVC with CMake uses msbuild by default which doesn't respect these
 328     // vars that we'd otherwise configure. In that case we just skip this
 329     // entirely.
 330     if target.contains("msvc") && !builder.config.ninja {
 331         return;
 332     }
 333
 334     let (cc, cxx) = match builder.config.llvm_clang_cl {
 335         Some(ref cl) => (cl.as_ref(), cl.as_ref()),
 336         None => (builder.cc(target), builder.cxx(target).unwrap()),
 337     };
 338
 339     // Handle msvc + ninja + ccache specially (this is what the bots use)
 340     if target.contains("msvc") && builder.config.ninja && builder.config.ccache.is_some() {
 341         let mut wrap_cc = env::current_exe().expect("failed to get cwd");
 342         wrap_cc.set_file_name("sccache-plus-cl.exe");
 343
 344         cfg.define("CMAKE_C_COMPILER", sanitize_cc(&wrap_cc))
 345             .define("CMAKE_CXX_COMPILER", sanitize_cc(&wrap_cc));
 346         cfg.env("SCCACHE_PATH", builder.config.ccache.as_ref().unwrap())
 347             .env("SCCACHE_TARGET", target)
 348             .env("SCCACHE_CC", &cc)
 349             .env("SCCACHE_CXX", &cxx);
 350
 351         // Building LLVM on MSVC can be a little ludicrous at times. We're so far
 352         // off the beaten path here that I'm not really sure this is even half
 353         // supported any more. Here we're trying to:
 354         //
 355         // * Build LLVM on MSVC
 356         // * Build LLVM with `clang-cl` instead of `cl.exe`
 357         // * Build a project with `sccache`
 358         // * Build for 32-bit as well
 359         // * Build with Ninja
 360         //
 361         // For `cl.exe` there are different binaries to compile 32/64 bit which
 362         // we use but for `clang-cl` there's only one which internally
 363         // multiplexes via flags. As a result it appears that CMake's detection
 364         // of a compiler's architecture and such on MSVC **doesn't** pass any
 365         // custom flags we pass in CMAKE_CXX_FLAGS below. This means that if we
 366         // use `clang-cl.exe` it's always diagnosed as a 64-bit compiler which
 367         // definitely causes problems since all the env vars are pointing to
 368         // 32-bit libraries.
 369         //
 370         // To hack around this... again... we pass an argument that's
 371         // unconditionally passed in the sccache shim. This'll get CMake to
 372         // correctly diagnose it's doing a 32-bit compilation and LLVM will
 373         // internally configure itself appropriately.
 374         if builder.config.llvm_clang_cl.is_some() && target.contains("i686") {
 375             cfg.env("SCCACHE_EXTRA_ARGS", "-m32");
 376         }
 377     } else {
 378         // If ccache is configured we inform the build a little differently how
 379         // to invoke ccache while also invoking our compilers.
 380         if use_compiler_launcher {
 381             if let Some(ref ccache) = builder.config.ccache {
 382                 cfg.define("CMAKE_C_COMPILER_LAUNCHER", ccache)
 383                     .define("CMAKE_CXX_COMPILER_LAUNCHER", ccache);
 384             }
 385         }
 386         cfg.define("CMAKE_C_COMPILER", sanitize_cc(cc))
 387             .define("CMAKE_CXX_COMPILER", sanitize_cc(cxx));
 388     }
 389
 390     cfg.build_arg("-j").build_arg(builder.jobs().to_string());
 391     let mut cflags = builder.cflags(target, GitRepo::Llvm).join(" ");
 392     if let Some(ref s) = builder.config.llvm_cflags {
 393         cflags.push_str(&format!(" {}", s));
 394     }
 395     cfg.define("CMAKE_C_FLAGS", cflags);
 396     let mut cxxflags = builder.cflags(target, GitRepo::Llvm).join(" ");
 397     if builder.config.llvm_static_stdcpp && !target.contains("msvc") && !target.contains("netbsd") {
 398         cxxflags.push_str(" -static-libstdc++");
 399     }
 400     if let Some(ref s) = builder.config.llvm_cxxflags {
 401         cxxflags.push_str(&format!(" {}", s));
 402     }
 403     cfg.define("CMAKE_CXX_FLAGS", cxxflags);
 404     if let Some(ar) = builder.ar(target) {
 405         if ar.is_absolute() {
 406             // LLVM build breaks if `CMAKE_AR` is a relative path, for some reason it
 407             // tries to resolve this path in the LLVM build directory.
 408             cfg.define("CMAKE_AR", sanitize_cc(ar));
 409         }
 410     }
 411
 412     if let Some(ranlib) = builder.ranlib(target) {
 413         if ranlib.is_absolute() {
 414             // LLVM build breaks if `CMAKE_RANLIB` is a relative path, for some reason it
 415             // tries to resolve this path in the LLVM build directory.
 416             cfg.define("CMAKE_RANLIB", sanitize_cc(ranlib));
 417         }
 418     }
 419
 420     if let Some(ref s) = builder.config.llvm_ldflags {
 421         cfg.define("CMAKE_SHARED_LINKER_FLAGS", s);
 422         cfg.define("CMAKE_MODULE_LINKER_FLAGS", s);
 423         cfg.define("CMAKE_EXE_LINKER_FLAGS", s);
 424     }
 425
 426     if env::var_os("SCCACHE_ERROR_LOG").is_some() {
 427         cfg.env("RUSTC_LOG", "sccache=warn");
 428     }
 429 }
 430
 431 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 432 pub struct Lld {
 433     pub target: Interned<String>,
 434 }
 435
 436 impl Step for Lld {
 437     type Output = PathBuf;
 438     const ONLY_HOSTS: bool = true;
 439
 440     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 441         run.path("src/llvm-project/lld").path("src/tools/lld")
 442     }
 443
 444     fn make_run(run: RunConfig<'_>) {
 445         run.builder.ensure(Lld { target: run.target });
 446     }
 447
 448     /// Compile LLVM for `target`.
 449     fn run(self, builder: &Builder<'_>) -> PathBuf {
 450         if builder.config.dry_run {
 451             return PathBuf::from("lld-out-dir-test-gen");
 452         }
 453         let target = self.target;
 454
 455         let llvm_config = builder.ensure(Llvm { target: self.target });
 456
 457         let out_dir = builder.lld_out(target);
 458         let done_stamp = out_dir.join("lld-finished-building");
 459         if done_stamp.exists() {
 460             return out_dir;
 461         }
 462
 463         builder.info(&format!("Building LLD for {}", target));
 464         let _time = util::timeit(&builder);
 465         t!(fs::create_dir_all(&out_dir));
 466
 467         let mut cfg = cmake::Config::new(builder.src.join("src/llvm-project/lld"));
 468         configure_cmake(builder, target, &mut cfg, true);
 469
 470         // This is an awful, awful hack. Discovered when we migrated to using
 471         // clang-cl to compile LLVM/LLD it turns out that LLD, when built out of
 472         // tree, will execute `llvm-config --cmakedir` and then tell CMake about
 473         // that directory for later processing. Unfortunately if this path has
 474         // forward slashes in it (which it basically always does on Windows)
 475         // then CMake will hit a syntax error later on as... something isn't
 476         // escaped it seems?
 477         //
 478         // Instead of attempting to fix this problem in upstream CMake and/or
 479         // LLVM/LLD we just hack around it here. This thin wrapper will take the
 480         // output from llvm-config and replace all instances of `\` with `/` to
 481         // ensure we don't hit the same bugs with escaping. It means that you
 482         // can't build on a system where your paths require `\` on Windows, but
 483         // there's probably a lot of reasons you can't do that other than this.
 484         let llvm_config_shim = env::current_exe().unwrap().with_file_name("llvm-config-wrapper");
 485         cfg.out_dir(&out_dir)
 486             .profile("Release")
 487             .env("LLVM_CONFIG_REAL", llvm_config)
 488             .define("LLVM_CONFIG_PATH", llvm_config_shim)
 489             .define("LLVM_INCLUDE_TESTS", "OFF");
 490
 491         cfg.build();
 492
 493         t!(File::create(&done_stamp));
 494         out_dir
 495     }
 496 }
 497
 498 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 499 pub struct TestHelpers {
 500     pub target: Interned<String>,
 501 }
 502
 503 impl Step for TestHelpers {
 504     type Output = ();
 505
 506     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 507         run.path("src/test/auxiliary/rust_test_helpers.c")
 508     }
 509
 510     fn make_run(run: RunConfig<'_>) {
 511         run.builder.ensure(TestHelpers { target: run.target })
 512     }
 513
 514     /// Compiles the `rust_test_helpers.c` library which we used in various
 515     /// `run-pass` tests for ABI testing.
 516     fn run(self, builder: &Builder<'_>) {
 517         if builder.config.dry_run {
 518             return;
 519         }
 520         let target = self.target;
 521         let dst = builder.test_helpers_out(target);
 522         let src = builder.src.join("src/test/auxiliary/rust_test_helpers.c");
 523         if up_to_date(&src, &dst.join("librust_test_helpers.a")) {
 524             return;
 525         }
 526
 527         builder.info("Building test helpers");
 528         t!(fs::create_dir_all(&dst));
 529         let mut cfg = cc::Build::new();
 530         // FIXME: Workaround for https://github.com/emscripten-core/emscripten/issues/9013
 531         if target.contains("emscripten") {
 532             cfg.pic(false);
 533         }
 534
 535         // We may have found various cross-compilers a little differently due to our
 536         // extra configuration, so inform gcc of these compilers. Note, though, that
 537         // on MSVC we still need gcc's detection of env vars (ugh).
 538         if !target.contains("msvc") {
 539             if let Some(ar) = builder.ar(target) {
 540                 cfg.archiver(ar);
 541             }
 542             cfg.compiler(builder.cc(target));
 543         }
 544
 545         cfg.cargo_metadata(false)
 546             .out_dir(&dst)
 547             .target(&target)
 548             .host(&builder.config.build)
 549             .opt_level(0)
 550             .warnings(false)
 551             .debug(false)
 552             .file(builder.src.join("src/test/auxiliary/rust_test_helpers.c"))
 553             .compile("rust_test_helpers");
 554     }
 555 }
 556
 557 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 558 pub struct Sanitizers {
 559     pub target: Interned<String>,
 560 }
 561
 562 impl Step for Sanitizers {
 563     type Output = Vec<SanitizerRuntime>;
 564
 565     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 566         run.path("src/llvm-project/compiler-rt").path("src/sanitizers")
 567     }
 568
 569     fn make_run(run: RunConfig<'_>) {
 570         run.builder.ensure(Sanitizers { target: run.target });
 571     }
 572
 573     /// Builds sanitizer runtime libraries.
 574     fn run(self, builder: &Builder<'_>) -> Self::Output {
 575         let compiler_rt_dir = builder.src.join("src/llvm-project/compiler-rt");
 576         if !compiler_rt_dir.exists() {
 577             return Vec::new();
 578         }
 579
 580         let out_dir = builder.native_dir(self.target).join("sanitizers");
 581         let runtimes = supported_sanitizers(&out_dir, self.target, &builder.config.channel);
 582         if runtimes.is_empty() {
 583             return runtimes;
 584         }
 585
 586         let llvm_config = builder.ensure(Llvm { target: builder.config.build });
 587         if builder.config.dry_run {
 588             return runtimes;
 589         }
 590
 591         let done_stamp = out_dir.join("sanitizers-finished-building");
 592         if done_stamp.exists() {
 593             builder.info(&format!(
 594                 "Assuming that sanitizers rebuild is not necessary. \
 595                 To force a rebuild, remove the file `{}`",
 596                 done_stamp.display()
 597             ));
 598             return runtimes;
 599         }
 600
 601         builder.info(&format!("Building sanitizers for {}", self.target));
 602         let _time = util::timeit(&builder);
 603
 604         let mut cfg = cmake::Config::new(&compiler_rt_dir);
 605         cfg.profile("Release");
 606         cfg.define("CMAKE_C_COMPILER_TARGET", self.target);
 607         cfg.define("COMPILER_RT_BUILD_BUILTINS", "OFF");
 608         cfg.define("COMPILER_RT_BUILD_CRT", "OFF");
 609         cfg.define("COMPILER_RT_BUILD_LIBFUZZER", "OFF");
 610         cfg.define("COMPILER_RT_BUILD_PROFILE", "OFF");
 611         cfg.define("COMPILER_RT_BUILD_SANITIZERS", "ON");
 612         cfg.define("COMPILER_RT_BUILD_XRAY", "OFF");
 613         cfg.define("COMPILER_RT_DEFAULT_TARGET_ONLY", "ON");
 614         cfg.define("COMPILER_RT_USE_LIBCXX", "OFF");
 615         cfg.define("LLVM_CONFIG_PATH", &llvm_config);
 616
 617         // On Darwin targets the sanitizer runtimes are build as universal binaries.
 618         // Unfortunately sccache currently lacks support to build them successfully.
 619         // Disable compiler launcher on Darwin targets to avoid potential issues.
 620         let use_compiler_launcher = !self.target.contains("apple-darwin");
 621         configure_cmake(builder, self.target, &mut cfg, use_compiler_launcher);
 622
 623         t!(fs::create_dir_all(&out_dir));
 624         cfg.out_dir(out_dir);
 625
 626         for runtime in &runtimes {
 627             cfg.build_target(&runtime.cmake_target);
 628             cfg.build();
 629         }
 630
 631         t!(fs::write(&done_stamp, b""));
 632
 633         runtimes
 634     }
 635 }
 636
 637 #[derive(Clone, Debug)]
 638 pub struct SanitizerRuntime {
 639     /// CMake target used to build the runtime.
 640     pub cmake_target: String,
 641     /// Path to the built runtime library.
 642     pub path: PathBuf,
 643     /// Library filename that will be used rustc.
 644     pub name: String,
 645 }
 646
 647 /// Returns sanitizers available on a given target.
 648 fn supported_sanitizers(
 649     out_dir: &Path,
 650     target: Interned<String>,
 651     channel: &str,
 652 ) -> Vec<SanitizerRuntime> {
 653     let mut result = Vec::new();
 654     match &*target {
 655         "x86_64-apple-darwin" => {
 656             for s in &["asan", "lsan", "tsan"] {
 657                 result.push(SanitizerRuntime {
 658                     cmake_target: format!("clang_rt.{}_osx_dynamic", s),
 659                     path: out_dir
 660                         .join(&format!("build/lib/darwin/libclang_rt.{}_osx_dynamic.dylib", s)),
 661                     name: format!("librustc-{}_rt.{}.dylib", channel, s),
 662                 });
 663             }
 664         }
 665         "x86_64-unknown-linux-gnu" => {
 666             for s in &["asan", "lsan", "msan", "tsan"] {
 667                 result.push(SanitizerRuntime {
 668                     cmake_target: format!("clang_rt.{}-x86_64", s),
 669                     path: out_dir.join(&format!("build/lib/linux/libclang_rt.{}-x86_64.a", s)),
 670                     name: format!("librustc-{}_rt.{}.a", channel, s),
 671                 });
 672             }
 673         }
 674         "x86_64-fuchsia" => {
 675             for s in &["asan"] {
 676                 result.push(SanitizerRuntime {
 677                     cmake_target: format!("clang_rt.{}-x86_64", s),
 678                     path: out_dir.join(&format!("build/lib/fuchsia/libclang_rt.{}-x86_64.a", s)),
 679                     name: format!("librustc-{}_rt.{}.a", channel, s),
 680                 });
 681             }
 682         }
 683         "aarch64-fuchsia" => {
 684             for s in &["asan"] {
 685                 result.push(SanitizerRuntime {
 686                     cmake_target: format!("clang_rt.{}-aarch64", s),
 687                     path: out_dir.join(&format!("build/lib/fuchsia/libclang_rt.{}-aarch64.a", s)),
 688                     name: format!("librustc-{}_rt.{}.a", channel, s),
 689                 });
 690             }
 691         }
 692         _ => {}
 693     }
 694     result
 695 }